GAOTek Mixed Signal Oscilloscope (Bandwidth 100 MHz, Sample rate 2 GS/s, Channel 2+1/LA 16) combines the functions of digital storage oscilloscope and logic analyzer with real time sampling rate upto 2 GS/s. This oscilloscope has an auto-scale function and built-in FFT function and supports a USB for data transmission to a PC. This instrument features a color liquid crystal display of high resolution and high contrast with adjustable back light and a multiple language user interface. The logic analyzer has 16 input channels with 4 M maximum storage for each channel. It allows convenient data measurement and data search with free setting of all kinds of threshold levels.
- Dual channel, 2 M points on each channel for the Record length
- Reading-out with the cursor
- Twenty automatic measurement functions
- Auto-scale function
- Storage and call-out of waveforms
- Automatic setting function provided capable of fast setting
- Multiple-waveform calculation function
- Built-in FFT function
- Implementation of detecting the average and peak values of the waveform
- Digital real-time oscilloscope function
- Edge, video, alternate, pulse and slope triggering function
- Color liquid crystal display of high resolution and high contrast with adjustable back light
- RS232 or USB communication ports
- Different continuous displaying time
- Multiple Language User Interface
- Logic Analyzer has 16 input channel with 4 M max Storage for each channel
|Sample Rate (real time)||2 GS/s|
|Rise Time||≤3.5 ns|
|Display||8.0 in color LCD, TFT screen, 640 pixels × 480 pixels|
|Channel||dual + external trigger|
|Horizontal Scale||2 ns/div – 100 s/div, step by 1 – 2 – 5|
|DC Accuracy (average)||average>16: ± (3 % reading + 0.05 div) for △V|
|Vertical Sensitivity||2 mV/div – 10 V/div|
|DC Gain Accuracy||±3 %|
|Vertical Resolution (A/D)||8 bits (2 channels simultaneously)|
|Interpolation||sin (x) / x|
|Max Input Voltage||400 V (DC + AC, PK – PK)|
|Probe Attenuation Factor||1 X, 10 X, 100 X, 1000 X|
|Trigger Mode||Edge, Video, Alternate, Pulse, Slope|
|Acquisition Mode||Normal, Peak Detect and Average|
|Record Length||Max 2 M points|
|Waveform Storage||4 Waveforms|
|Automatic Measurement||Vpp, Vavg, Vamp, Vrms, Freq, Period, Vmax, Vmin, Vtop, Vbase, Overshoot, Preshoot,|
Rise Time, Fall Time, Delay A→B↑, Delay A→B↓, +Width, -Width, +Duty, -Duty
|Waveform Math||+, -, x, ÷, FFT|
|Power Supply||100 V – 240 V AC, 50 Hz/ 60 Hz, CAT Ⅱ|
|Lissajou’s Figure||Bandwidth||100 MHz|
|Phase Difference||±3 degrees|
|Communication Interface||USB2.0, USB host, and RS232 / VGA (optional)|
|Fuse||1 A, T class, 250 V|
|Dimensions (W × H × D)||14.56 in x 7.08 in x 4.72 in (370 mm × 180 mm × 120 mm)|
|Weight (without package)||4.85 lb (2.20 kg)|
|Logic Analyzer Performance Specifications|
|Sample Rate (real time)||20 S/s – 2 GS/s|
|Record Length||Max 4 M each channel|
|Input Impedance||660 KΩ ± 5 %, in parallel with 15 ± 5 pF|
|Trigger Mode||Edge, Bus, State, Data Alignment, Data Width, Distributed Queue|
|Trigger Position Setting||Pre-trigger, Mid-trigger and Re-trigger|
|Threshold Voltage||±6 V (4 settings)|
|Input Signal Range||±30 V|
|Data System||binary, decimal, hex|
|Digital Filter||0, 1, 2 optional|
|Setting Storage||10 settings|
|USB Flash Disk Storage||Available|
- Designing and Debugging
- Circuit Function Test
- Identification signals logic information
- Education and training
- Mixed signal circuit test
Introduction to the Front Panel and the User Interface
This mixed oscilloscope offers a simple front panel with distinct functions to users for their completing some basic operations, in which the knobs and function push buttons are included. The knobs have the functions similar to other oscilloscopes. The 5 buttons in the column on the right side of the display screen are menu selection buttons (defined as F1 to F5 from top to bottom respectively), through which, you can set the different options for the current menu. The other push buttons are function buttons, through which, you can enter different function menus or obtain a specific function application directly.
- Power on/off
- Display area
- Control (key and knob) area
- U slot
- LA signal input
- DSO signal input
- Measurement signal output
- Power and charging indication: Green light indicates AC supply and battery full charged; yellow light indicate under charging.
Control (key and knob) area
- Menu option setting: F1 ~ F5
- Switch :
Switch includes two keys and one knob. Press “OSC/LA” to switch between Digital Signal Oscilloscope and Logic Analyzer.
For DSO “cursor” knob and “info” key are idle. But the “cursor” knob takes effect in magnifying or minifying the waveform after FFT operation when the mode is FFT.
For Logic Analyzer, “cursor” knob to adjust current cursor position and “info” key to loading setting info for acquired waveform and current waveform
- Function key area
- Vertical control area:
It includes 3 keys and 4 knobs.
For DSO: “CH1 menu” and “CH2 menu” correspond to setting menu in CH1 and CH2, “Wave Math” key refer to math menu, the math menu consists of six kinds of operations, including CH1-CH2, CH2-CH1, CH1+CH2 ,CH1*CH2,CH1/CH2 and FFT. Two “Vertical position” knobs control the vertical position of CH1.CH2 and two “Volts / Div” knob control voltage scale of CH1, CH2.
For LA, “CH1 menu”, “CH2 menu”, “Wave math” keys and “CH2 Volts / Div” knob are idle. “CH1 Vertical”, “CH2 Vertical” to adjust the M1, M2 position in Cursor menu when cursor display is on “CH1 Volts/Div”.
- Horizontal control area with 2 knob and 1 key:
For DSO, “Horizontal position” knob control trigger position, “Volts/Div” control time base, “Horizontal menu” key refer to horizontal system setting menu.
For LA, “Horizontal menu” key is idle. “Horizontal position” knob to adjust the position of value displayed currently quickly. “Sec/Div” knob to adjust value resolution displayed currently.
- Trigger control area with 4 keys and 1 knob
Digital Storage Oscilloscope
User interface introduction
The Trigger State indicates the following information:
Auto: The oscilloscope is under the Automatic mode and is collecting the waveform under the non-trigger state.
Trig’ d: The oscilloscope has already detected a trigger signal and is collecting the after-triggering information.
Ready: All pre-triggered data have been captured and the oscilloscope has been already ready for accepting a trigger.
Scan: The oscilloscope captures and displays the waveform data continuously in the scan mode.
Stop: The oscilloscope has already stopped the waveform data acquisition.
- Waveform Viewing Area.
- The purple pointer indicates the horizontal trigger position, which can be adjusted by the horizontal position control knob.
- The pointer indicates the trigger position in the internal memory.
- This reading shows the time deviation between the horizontal trigger position and the window centre line, which is regarded as 0 in the window centre.
- It indicates the current function menu.
- It indicates the operation options for the current function menu, which changes with the function menus.
- The purple pointer shows the trigger level position.
- The reading shows the trigger level value.
- The reading shows the trigger source.
- It shows the selected trigger type:
Rising edge triggering
Falling edge triggering
Video line synchronous triggering
Video field synchronous triggering
- The reading shows the window time base set value.
- The reading shows the main time base set value.
- The two yellow dotted lines indicate the size of the viewing expanded window.
- The icon shows the coupling mode of the CH2 channel.
” — ” indicates the direct current coupling
” ～ ” indicates the AC coupling
” ” indicates GND coupling.
- The reading shows the vertical scale factor (the Voltage Division) of the CH2 channel.
- The icon indicates the coupling mode of the CH1 channel: The icon “–” indicates the direct current coupling. The icon “～” indicates the AC coupling .The icon “” indicates GND coupling.
- The reading indicates the vertical scale factor (the Voltage Division) of the CH1 channel.
- The information shows the zero point positions of CH1 or CH2 channel.
- The yellow pointer shows the grounding datum point (zero point position) of the waveform of the CH2 channel. If the pointer is not displayed, it shows that this channel is not opened.
- The red pointer indicates the grounding datum point (zero point position) of the waveform of the CH1 channel. If the pointer is not displayed, it shows that the channel is not opened.
- The positions of two purple dotted line cursors measurements.
- The reading shows the frequency of the two channels. It is a 6 digits cymometer. Its measurement range of frequency is 2Hz to full bandwidth. When the triggering mode is edge triggering, it is a one channel cymometer and it can only measure the frequency of the triggering channel. When the triggering mode is alternating triggering, it is a two channel cymometer and it can measure the frequency of two channels.
How to implement the Function Inspection
Make a fast function check to verify the normal operation of the instrument, according to the following steps:
- Connect the Instrument to the Power and Push down the Power Switch Button.
The instrument carries out all self-check items and shows the prompt “Press any Key Enter system“. Press the “8 (UTILITY)” button to get access to the “FUNCTION” menu and push down F2 the menu selection button to call out the function “Recall Factory”. The default attenuation coefficient set value of the probe in the menu is 10X,
- Set the Switch in the Oscilloscope Probe as 10X and Connect the Oscilloscope with CH1 Channel.
Align the slot in the probe with the plug in the CH1 connector BNC, and then tighten the probe with rotating it to the right side.
Connect the probe tip and the ground clamp to the connector of the probe compensator.
- Press the “7(AUTOSET)”
The square wave of 1 KHz frequency and 5 V peak-peak value will be displayed in several seconds (as shown below)
Check CH2 by repeating Step 2 and Step 3
How to Implement the Probe Compensation
For adjusting the probe compensation, please carry out the following steps:
- Set the attenuation coefficient of the probe in the menu as 10 X and that of the switch in the probe as 10 X, and connect the oscilloscope probe with the CH1 channel. If a probe hook tip is used, ensure that it keeps in close touch with the probe. Connect the probe tip with the signal connector of the probe compensator and connect the reference wire clamp with the ground wire connector of the probe connector, and then press the button “7(AUTOSET)”.
- Check the displayed wave forms and regulate the probe till a correct compensation is achieved (see the figures below)
Displayed Wave Forms of the Probe Compensation
- Repeat the steps mentioned if necessary
How to Set the Probe Attenuation Coefficient
The probe has several attenuation coefficients, which will influence the vertical scale factor of the oscilloscope. If it is required to change (check) the set value of the probe attenuation coefficient, press the function menu button of the channels used, then push down the selection button corresponding to the probe till the correct set value is shown. This setting will be valid all the time before it is changed again.
Note: The attenuation coefficient of the probe in the menu is pre-set to 10X when the oscilloscope is delivered from the factory.
Make sure that the set value of the attenuation switch in the probe is the same as the menu selection of the probe in the oscilloscope.The set values of the probe switch are 1 X and 10 X (see fig. below).
How to Use the Probe Safely
The safety guard ring around the probe body protects your finger against the electric shock, shown in Figure.
Warning: In order to avoid suffering from the electric shock, please keep your finger behind the safety guard ring of the probe body during the operation. In order to protect you from suffering from the electric shock during your using the probe, do not touch the metal part of the probe tip when the probe is connected to the power supply. Before making any measurements, please connect the probe to the instrument and connect the ground terminal to the earth.
How to Implement Auto-calibration
The auto-calibration application can make the oscilloscope reach the optimum condition rapidly to obtain the most accurate measurement value. You can carry out this application program at any time, but when the range of variation of the ambient temperature is up to or over 41 °F (5 °C), this program must be executed. For the performing of the self-calibration, all probes or wires should be disconnected with the input connector first. Then, press the “8(UTILITY)” button to call out the FUNCTION menu; push down the F3 menu selection button to choose the option ” Do Self Cal”; finally, run the program after confirming that everything is ready now.
Introduction to the Vertical System
Shown in figure, there are a series of buttons and knobs in VERTICAL CONTROLS. The following practices will gradually direct you to be familiar with the using of the vertical setting.
- Use the button “VERTICAL POSITION” knob to show the signal in the center of the waveform window. The “VERTICAL POSITION” knob functions the regulating of the vertical display position of the signal. Thus, when the “VERTICAL POSITION” knob is rotated, the pointer of the earth datum point of the channel is directed to move up and down following the wave form.
Measuring Skill: If the channel is under the DC coupling mode, you can rapidly measure the DC component of the signal through the observation of the difference between the wave form and the signal ground. If the channel is under the AC mode, the DC component will be removed by filtration. This mode helps you display the AC component of the signal with a higher sensitivity.
- Change the Vertical Setting and Observe the Consequent State Information Change. With the information displayed in the status bar at the bottom of the waveform window, you can determine any changes in the channel vertical scale factor.
- Rotate the vertical “VOLTS/DIV” knob and change the “Vertical Scale Factor (Voltage Division)”, it can be found that the scale factor of the channel corresponding to the status bar has been changed accordingly.
- Press buttons of “CH1 MENU”, “CH2 MENU” and “MATH MENU”, the operation menu, symbols, wave forms and scale factor status information of the corresponding channel will be displayed in the screen.
Introduction to the Horizontal System
Shown in figure, there are a button and two knobs in the “HORIZONTAL CONTROLS”. The following practices will gradually direct you to be familiar with the setting of horizontal time base.
- Use the horizontal “SEC/DIV” knob to change the horizontal time base setting and observe the consequent status information change. Rotate the horizontal “SEC/DIV” knob to change the horizontal time base, and it can be found that the “Horizontal Time Base” display in the status bar changes accordingly. The horizontal scanning speed steps from 2 ns up to 100 s in the sequence of 1-2-5.
- Use the “HORIZONTAL POSITION” knob to adjust the horizontal position of the signal in the waveform window. The “HORIZONTAL POSITION” knob is used to control the triggering displacement of the signal or for other special applications. If it is applied to triggering the displacement, it can be observed that the wave form moves horizontally with the knob when you rotate the “Horizontal Position” knob.
- With the “HORIZONTAL MENU” button pushed down, you can set and initiate the Window Expansion.
Introduction to the Trigger System
Shown in figure, there are a knob and four buttons in the “TRIGGER CONTROLS”. The following practices will direct you to be familiar with the setting of the trigger system gradually.
- Press the “TRIG MENU” button and call out the trigger menu. With the operations of the 5 menu selection buttons, the trigger setting can be changed.
- Use the “LEVEL” knob to change the trigger level setting. With the rotation of the “LEVEL” knob, it is seen that the trigger indicator in the screen will move up and down with the rotation of the knob. With the movement of the trigger indicator, it can be observed that the trigger level value displayed in the screen changes.
- Press the button “SET TO 50 %” to set the trigger level as the vertical midpoint values of the amplitude of the trigger signal.
- Press the “FORCE TRIG” button to force a trigger signal, which is mainly applied to the “Normal” and “Single” trigger modes.
- The “SET TO ZERO” button is used to reset the trigger horizontal position.
User Interface Introduction
- Channel and Bus indicate: display current working channel and bus
- Channel binary value display: display binary system value for the channel position in current cursor
- Battery powers indicate: indicate battery power when battery inside
- Decimal system value indicates the position of current cursor in storage area
- Yellow dashed line indicates current cursor
- Blue dashed line indicates current trigger position
- Percentage value indicate current trigger position in storage area
- Sample data area indication: red for bus, blue and green for “0”, “1” in each channel data.
- Decimal system value indicates the position of current cursor relate to current trigger
- Operation options indicate current function menu and different function menu have different display
- Sample status indicate: “RUN” for sampling and wait for trigger, “TRIG” for trigger detected and wait for sample finished. “STOP” for sampling finished
- Value indicate current time base
- Info windows: different operation display different info
- Value display current filter modulus setting
- Value display current sample rate setting
- Two purple lines for cursor 1 and cursor 2 in cursor measurement
- Percentage value indicate trigger position for next sampling in storage area
- Red square indicates the current sampling data position in storage area
- Red scale line indicates the time base width in sampling data display area and totally 4.8 divisions. The width between two long scale lines is 1 division and between short scale lines are 0.1 divisions.
How to Acquire Data
When you start to acquire LA begins sampling data from the probes. Then each time clock occurs the data will be sampled. Then sampled data is sent to trigger function block and store in main memory. The trigger program checks specific events with the sampled data and take specific action. The trigger program can check events as rising edge, data values, and data ranges etc. LA module enables a post trigger delay counter when trigger reach specified value and to allow post trigger portion of the acquisition memory to fill before data acquisition stops. Press “F” to get into data acquisition mode after finish setting for trigger and sampling. Then running status display as “RUN” and running status display “TRIG” when detected trigger signal and display “STOP” when data acquisition finished. Then you can start to analyze data. Data acquisition can be stopped by press “F” again during the process.
How to Observe and Analyze the Data
Follow below steps to observe and analyze the current data acquired:
- Turn “Sec/Div” knob to adjust the time length for data display in each division (to adjust the data resolution displayed).
- Turn “Cursor” knob to observe more details for the data of current cursor position. The data of binary value for current cursor position display in binary system area and power on measure menu then bus value for current cursor position will display in measurement window.
- Turn “horizontal position” knob can move the current displayed data to left/right position in storage area quickly.
We need only three channels as what we measure is 3 signals. And other channel and bus can be off. In this way the display resolution in using channel will be increased. Display system mainly to set on/off for measure channel. We use CH00, CH01, and CH02 as measure channel correspond to signal enable, clock, data accordingly. Other channel and bus is off.
- Press “A (DISPLAY)” and display menu appears.
- Press “F1” till signal sources display as “Channel”.
- Press “F2” or turn “CH1 Volts/Div” knob till channel No. display as “CH00”.
- Press “F3” and set the signal sources as “ON”. Repeat operation of steps 3.4 and set CH01, CH02 as “ON” and CH03-CHOF as “OFF”. Refer to Figure.
- Press “F1″ till sources display as” BUS”.
- Press “F2″ till Bus No. display as”BUS0”.
- Press “F3” and set signal sources as “OFF”. Repeat operation of steps 6.7 and set BUS1, BUS2, BUS3 all as “OFF”. Refer to figure.
- Now the screen only shows CH00, CH01, CH02 and others channel and bus are all off.
LA is same as DSO and need to make trigger to synchronize data. The trigger system mainly to set trigger sources, trigger mode and trigger position. We make CH00 as trigger source and trigger mode as falling edge, trigger position in 50 %. Trigger system setting steps as below:
- Press “Trig menu” and menu appears.
- Press “F1” till trigger mode display as “Edge”.
- Press “F2” or turn “CH1 Volts/Div” till trigger sources display as “CH00”.
- Press “F3” till trigger type display as “Falling”.
- Turn “Trigger adjust” knob or press “SET 50 %”till “NEXT T POS” window display as “50 %” Then trigger system setting finished.
Threshold Voltage System
Threshold voltage system is to set high/low of the trigger voltage. The system already fixed the setting for normal logic voltage as CMOS, LVMOS etc. And you can set any trigger voltage using custom setting. The signal voltage is 3.3 V and we set threshold voltage as “LVCMO 3.3 V/1.7 V” as below steps:
- Press “1 (Threshold)” key and the menu appears.
- Press “F1” key till Channel display as “CH00 ~ CH03”
- Press “F2” key till threshold display as “LVCMOS 3.3 V/ 1.7 V”. Then the threshold setting is finished.
The waveform accuracy reverts from sample data depend on sample rate for measured signals. The waveform reverted in LA is referring to the sample signals storage in the memory. The recorded data will display in error if the sample rate is too low.
There is an importance compromise between recorded signal resolution and its continuance (relate to time). The sample memory depth of LA is fixed and once adding sample rate then resolution will get better accordingly. But it will decrease the continuance for acquire signal. In a word, if the sample rate is quicker, the continuance for recorded signal will get smaller but with better resolution. Sampling system can set difference sample rate and storage depth. We use 10 times sampling rate to measure the signal clock frequency of 1 M, and storage depth set as “Normal”.
Sampling system setting steps as below:
- Press “E (ACQUIRE)” and menu appears.
- Press “F1” or turn “CH1 Volts/div” knob till sample rate setting display as”10M”.
- Press “F2” till storage depth display as “General”. Sampling system setting finished (ref to the fig.) Then press “F” and start to sampling data.
Digital Storage Oscilloscope
How to Set the Vertical System
The VERTICAL CONTROLS include three menu buttons such as CH1 MENU, CH2 MENU and MATH MENU, and four knobs such as VERTICAL POSITION, VOLTS/DIV (one group for each of the two channels).
Setting of CH1 and CH2
Every channel has an independent vertical menu and each item is set respectively based on the channel. With the “CH1 MENU” or “CH2 MENU” menu button pushed down, the system shows the operation menu of the corresponding channel. By pressing F1, F2, F3, F4 etc., you can change and select the settings.
Channel Setting Menu
The following table explains more details of these function and settings.
|Block the DC component from input signal. Pass both AC and DC components from input signal. Input signal is interrupted.|
|Band Limit||OFF 100 MHz|
ON 20 MHz
|Get full bandwidth. Limits the channel bandwidth to 20 MHz to reduce display noise|
|Close the measurement channel. Open the measuring channel.|
|Choose one according to the probe attenuation factor to make the vertical scale reading accurate.|
|Display original waveform.|
Display inverted waveform.
Setting Coupling for selected Channel
A square waveform is used as an input in this example.
- Press the CH1 MENU button to show submenu CH1 SETUP.
- Press F1 next to Coupling and select “AC”, now DC component is blocked from input signal.
- Press F1 again to set “DC” mode, both AC and DC components get passed.
Setting the “Band Limit”
Taking the Channel 1 for example, the operation steps are shown as below:
- Press the CH1 MENU button and call out the CH1 SETUP menu.
- Press the F2 menu selection button and select the Band Limit as OFF 100 MHz, with Channel 1 Band Limit switched off.
- Press F2 menu selection button again, select the Band Limit as ON 20 MHz, with Channel 1 Band Limit is switched on.
Setting the Channel “ON/OFF”
Taking the Channel 1 for example, the operation steps are shown as below:
- Press the CH1 MENU button and call out the CH1 SETUP menu.
- Press the F3 menu selection button and select the Channel as OFF, with Channel 1 switched off.
- Press F3 menu selection button again, select the channel as ON, with Channel 1 is switched on.
Note: In FFT mode, both CH1 and CH2 are not allowed to be ON when F3 is pressed.
Regulate the Attenuation Ratio of the Probe
In order to match the attenuation coefficient of the probe, it is required to adjust the attenuation ration coefficient of the probe through the operating menu of the Channel accordingly. If the attenuation coefficient of the probe is 1:1, that of the oscilloscope input channel should also be set to 1 X to avoid any errors presented in the displayed scale factor information and the measured data.
A List of the Attenuation Coefficient of Probes and the Corresponding Menu Settings:
|Attenuation Coefficient of the Probe||Corresponding Menu Setting|
Setting of Wave Form Inverted
Wave form Inverted: The displayed signal is turned 180 degrees against the phase of the earth potential. Taking the Channel 1 for example, the operation steps are shown as follows:
- Press the CH1 MENU button and get access to the CH1 SETUP menu.
- Press the F5 menu selection button and select ON in the Inverted. The wave form inverted function is initiated.
- Press the F5 menu selection button again and select OFF for Inverted item. The function of wave form inverted is closed off.
Waveform not Inverted Waveform Invereted
Application of VERTICAL POSITION and VOLTS/DIV Knobs
- The VERTICAL POSITION knob is used to adjust the vertical positions of the wave forms of all Channels (including those resulted from the mathematical operation). The analytic resolution of this control knob changes with the vertical division.
- The VOLTS/DIV knob is used to regulate the vertical resolution of the wave forms of all channels (including those obtained from the mathematical manipulation), which can determine the sensitivity of the vertical division with the sequence of 1-2-5. The vertical sensitivity goes up when the knob is rotated clockwise and goes down when the knob is rotated anticlockwise.
- When the vertical position of the channel wave form is adjusted, the screen shows the information concerning the vertical position at the lower left corner (see Figure).
How to Set the Horizontal system
The HORIZONTAL CONTROLS include the HORIZONTAL MENU button and such knobs as HORIZONTAL POSITION and SEC/DIV.
- HORIZONTAL POSITION knob: this knob is used to adjust the horizontal positions of all channels (include those obtained from the mathematical manipulation), the analytic resolution of which changes with the time base.
- SEC/DIV knob: it is used to set the horizontal scale factor for setting the main time base or the window.
- HORIZONTAL MENU button: Press this button to active TIME MODE shown as below with description of each function (see Figure).
|Main Time Base||The setting of the horizontal main time base is used to display the wave form|
|Set Window||A window area is defined by two cursors.|
|Zone Window||The defined window area for display is expanded to the full screen.|
How to Set Trigger System
When the oscilloscope begins to collect the data and display the wave form depends on a trigger. Once it is set correctly, the trigger can transfer the unstable display into a meaningful wave form. When beginning to collect data, the oscilloscope will collect adequate data to draw the wave form at the left side of the trigger point at first. It will continuously perform the data acquisition while waiting for the trigger condition. After a trigger is detected, the oscilloscope will continuously collect data enough to draw the wave form at the right side of the trigger point. One knob and four function menu buttons are included in the trigger control zone.
TRIG LEVEL: Trigger the level control knob and set the signal voltage corresponding to the trigger point.
SET TO 50 %: Set the trigger level as the vertical midpoint value of the amplitude of the trigger signal.
FORCE TRIG: It is a force trigger button for the generation of a trigger signal, which is mainly used in the “Normal” and “Single” triggering modes.
SET TO ZERO: Trigger the resetting of the horizontal position.
TRIG MENU: It is a trigger menu button. When it is pressed, an operation menu will be presented in the screen.
The oscilloscope provides two trigger types: single trigger and alternate trigger. Press F1 to choose.
Single trigger: Use a trigger level to capture stable waveforms in two channels simultaneously
Alternate trigger: Trigger on non-synchronized signals.
The Single Trigger and Alternate Trigger menus are described respectively as follows:
Single trigger has four modes: edge trigger, video trigger, pulse trigger and slope trigger.
Edge Trigger: It happens when the trigger input passes through a given level along the set direction.
Video Trigger: Carry out field or line video trigger on the standard video signal.
Pulse Trigger: Use this trigger type to catch pulses with certain pulse width..
Slope Trigger: The oscilloscope begins to trigger according to the signal rising or falling speed.
Trigger signal comes from two vertical channels when alternate trigger is on. This mode is used to observe two unrelated signals. You can choose different trigger modes for different channels. The options are as follows: edge, video, pulse or slope.
How to Operate the Function Menu
The function menu control zone includes 7 function menu buttons and 3 immediate-execution buttons: SAVE/RCL, MEASURE, ACQUIRE, UTILITY,CURSOR, DISPLAY, AUTOSCALE, AUTOSET, RUN/STOP and U-DISK COPY.
How to Implement Sampling Setup
Press the ACQUIRE button and the menu is displayed in the screen, shown as figure.
ACQU MODE Menu
|Sample||Normal sampling mode.|
|Use to capture maximal and minimal samples. Finding highest and lowest points over adjacent intervals.|
|Average||Use to reduce random noise, four options are available as follows.|
|Averages||4, 16, 64, 128||Four options, indicating the number of averages.|
How to Save and Recall a Wave Form
Press the SAVE/RCL button, you can save and call out the waveforms in the instrument.
|CH1||Source of wave form to be saved.|
|WAVE||A , B||Location where selected waveform to|
|C , D||be saved or recalled.|
|Save||Action to save selected waveform to|
|CH(X)||OFF||Turn Display on/off for selected and|
Save a waveform
A sine wave form input CH1. Follow these steps to save waveform from CH1.
- Under WAVE SAVE MENU, press F1 next to Source to select CH1.
- Press F2 next to WAVE to assign Location A for this waveform.
- Press F3 next to Save to store the waveform captured from CH1.
Recall a stored waveform
Once the waveform is stored you can recall and display it on the screen. The waveform would remain there until the next one is stored at the same location, hence, the previous stored waveform would be overwritten by the new one.
To recall a stored waveform, activate WAVE SAVE menu
- Press F2 next to Wave to select from one of four locations, the CH(X) would show the location you’ve chose
- Press F4 next to CH(X) to change to ON. Now you will see a stored waveform displayed on the screen with whatever waveforms are already on there.
- Example to save/recall a waveform from location A. figure.
Carry out a Self-Calibration
We have a built-in Self-Calibration procedure, by performing a Self-Calibration would help to maintain the accuracy of your oscilloscope under ambient temperature. It is recommended to carry a self-Calibration if the change of the ambient temperature is up to or exceeds 41 °F (5 °C).
Notes: Disconnect all inputs before carrying out a self-calibration. Fail to do so may cause damage to your oscilloscope.
Here are the procedures for carrying a self-calibration.
- Disconnect all inputs, including probes and wires etc.
- Press UTILITY to activate Function menu.
- Press F3 next to Do Self-Cal.
Now there is a yellow window popping up to ask for a confirmation. Press F3 again, the Oscilloscope starts the self-calibration and yellow window remains the calibration is done. Please be aware that no contacts to any inputs channels until the calibration is done.
How to set Utility
Utility function includes recall factory, Language, Carry.
Utility menu as below
|Recall factory||Default setting for LA|
|Support multi-languages, choose you preferred system language.|
|Set data format to be vector and loading data display with “Bin” format|
Set data format to be BMP and loading data display with “BMP” format.
In case the oscilloscope is still in the black-screen state without any display after the power is switch on, implement the following fault treatment procedure.
- Check whether the power connection is connected properly.
- Check whether the power switch is pushed down to the designated position.
- Restart the instrument after completing the checks above.
- If this product still cannot work normally, please get in touch with Lilliput and we will be under your service.
After acquiring the signal, carry out the following operations if the wave form of the signal is not displayed in the screen.
- Check whether the probe is properly connected to the signal connecting wire.
- Check whether the signal connecting wire is correctly connected to the BNC (namely, the channel connector).
- Check whether the probe is properly connected with the object to be measured.
- Check whether there is any signal generated from the object to be measured (the trouble can be shot by the connection of the channel from which there is a signal generated with the channel in fault).
- Make the signal acquisition operation again.
The measured voltage amplitude value is 10 times greater or smaller than the actual value.
- Check whether the channel attenuation coefficient and the attenuation ration of the probe used in practical application is match.
There is wave form displayed, but it is not stable.
- Check whether the Source item in the TRIG MODE menu is in conformity with the signal channel used in the practical application.
- Check on the trigger Type item: The common signal chooses the Edge trigger mode for Type and the video signal the Video. Only if a proper trigger mode is applied, the wave form can be displayed steadily.
- Try to change the trigger coupling into the high frequency suppress and the low frequency suppress to smooth the high frequency or low frequency noise triggered by the interference.
No Display Responses to the Push-down of RUN/STOP.
- Check whether Normal or Signal is chosen for Polarity in the TRIG MODE menu and the trigger level exceeds the wave form range.
- If it is, make the trigger level is centered in the screen or set the trigger mode as Auto. In addition, with the AUTOSET button pressed, the above settings can be completed automatically.
After the AVERAGE value sampling is set in the ACQU MODE or the longer duration is set in the DISP MODE, the display rate is slowed down.It is a normal phenomenon.
Maintenance, Cleaning and Repairing
Please do not store or keep the instrument in the place where the liquid crystal display will be directly exposed to the sunlight for a long time.
Caution: The instrument or probe should not be stained with the spraying agent, liquid and solvent to avoid any damage to it.
Check the probe and instrument regularly according to their operating state. Clean the external surface of the instrument following the steps shown below:
- Please wipe the dust from the instrument and probe surface with a soft cloth. Do not make any scuffing on the transparent LCD projection screen when cleaning the LCD screen.
- Clean the instrument with a wet soft cloth, please pay attention to the disconnection of power. It is recommended to scrub with soft detergent or fresh water. Please don’t apply any corrosive chemical cleaning agent to prevent the instrument or probe from damage.
Warning: Before power on for operation, it is required to confirm that the instrument has already been dried completely, avoiding any electrical short circuit or bodily injury resulting from the moisture.