GAOTek Surface Roughness Tester with data memory (National Std)

This Surface Roughness Tester with data memory (National Std) is designed for surface roughness shape measurement with various parameters and stores 100 groups of large capacity data memory.




The GAOTek Surface Roughness Tester with data memory (National Std) is designed for surface roughness shape measurement with various parameters and stores 100 groups of large capacity data memory.  This tester offers various parameters such as Ra, Rz, Rq, Rt, Rp, Rv, R3z, R3y, RzJIS, Rsk, Rku, Rsm, Rmr and Rx. It measures the surface roughness of various machinery-processed parts quickly and precisely. It uses the DSP chip to control and process data which ensures high speed and low power consumption. It provides Real-time clock settings for the data recording and storage. The measurement results are displayed digital/graphically on the OLED and output to the printer. It is compatible with various with ISO, DIN, ANSI, JIS national and international standards.

Key Features

  • Electromechanical integration design, small volume, light weight, easy to use.
  • Using DSP chip to control and process data; high speed, low power consumption.
  • Large range, parameters Ra, Rz, Rq, Rt, Rp, Rv, R3z, R3y, RzJIS, Rsk, Rku, Rsm, Rmr, Rx.
  • 128 x 64 OLED dot matrix display, digital / graphic display; highlight no perspective.
  • Displays information rich, intuitive and can display all the parameters and graphics.
  • Compatible with ISO, DIN, ANSI, JIS national standards.
  • Built-in lithium ion rechargeable battery and a charging control circuit; high capacity, no memory effect.
  • Residual quantity indicator icon; prompts the user to charge.
  • Display of the charging process instructions, enables the operator tounderstand the degree of charge.
  • Working time more than 20 hours of continuous work.
  • Large capacity data memory; can store 100 groups of original data and waveform.
  • Real-time clock settings and display; convenient data recording and storage.
  • Automatic dormancy, automatic shutdown and power saving function.
  • Reliable control motor to go dead circuit and software design.
  • Measurement information display, menu prompt information, false information and switch machine and other tips.
  • Full metal shell design, sturdy, compact, portable, high reliability.
  • Can freely switch to English.
  • Can be connected to a computer and printer.

Technical Specifications

Detection Principle Current Induction
Measuring Range 160 µm
Tip Radius 5 µm
Stylus Force 4 mN (0.4 gf)
Stylus Angle 90°
Guide Head Vertical Radius 1.8 in (45 mm)
Other Specifications
Parameter Ra (0.005 µm ~ 16 µm)

Rz (0.02 µm ~ 160 µm)

Rq, Rt, Rp, Rv, R3z, R3y, RzJIS, Rsk, Rku, Rsm, Rmr, Rx

Standard ISO, DIN, ANSI, JIS
Output Interface USB
Measured Profile Roughness, Waviness, Original Contour
Maximum driving trip 0.7 in (17.5 mm)
Sampling Length 0.0098 in (0.25 mm), 0.031 in (0.8 mm), 0.098 in (2.5 mm), 0.31 in (8 mm)
Evaluation Length (1-5) L
Filter RC, PCRC, Gauss, ISO 13565
Accuracy Not more than ±10 %
Repeatability Not more than 6 %
Storage 100 groups of original data
Power Supply Built-in rechargeable Lithium ion battery

Or external power adaptor

Working Time More than 20 hours
Dimension 5.5 in × 2.16 in × 1.57 in (141 mm × 55 mm × 40 mm)
Weight 0.88 lbs (400 g)
Humidity < 90 % RH
Storage and Transportation Humidity < 90 % RH
Storage and Transportation Temperature -40 °F ~ 140 °F (- 40 °C ~ 60 °C)
Operating Temperature -4 °F ~ 104 °F (-20 °C ~ 40 °C)

Additional Information

Measurement Principle

When measuring roughness of part surface, the pickup is placed on the surface of the part and the surface is traced at constant rate. The pickup acquires the surface roughness by the sharp stylus in pickup. The roughness causes displacement of pickup which results in change of inductive value of induction coils thus generating analogue signal which is in proportion to surface roughness at output end of phase-sensitive rectifier. This signal enters data collection system after amplification and level conversion. Those collected data are processed with digital filtering and parameter calculation by DSP chip and the measuring result can be read on OLED, printed through printer and communicated with PC.

Name of Each Part

Buttons Define

Battery Charging

When battery voltage is too low(that is, battery voltage symbol display on screen to prompt low voltage), the instrument should be charged as soon as possible. Use USB port of the instrument for charging. You can use the built-in power adapter for charging, you can also use computer’s USB port for charging. If you use the other power adapter for charging, the output voltage should be 5 V DC, the current should be greater than 800 mA.

Instrument displays charging animation when charging after full animation ends, the display is full of symbols. Charging time is of 2.5 hours.

This instrument adopts lithium ion chargeable battery without memory effect and charging can be fulfilled at any time without affecting normal operation of the instrument.

Connection Method of Sensor and Main Unit

Installation and Removing of sensor

For installation, hold the main body of sensor with hand, push it into connection adapter at the bottom of the instrument as shown in Figure and then slightly push it to the end of the sheath. To remove, hold the main body of pickup or the root of protective sheath with hand and slowly pull it out.

Measuring Operation

Preparation for Measurement
  • Switch-on to check if battery voltage is normal;
  • Clear the surface of part to be measured;
  • Place the instrument correctly, stably and reliably on the surface to be measured;
  • Trace of the pickup must be vertical to the direction of process line of the measured surface.

Turning On/Off

Press the key to hold 2 seconds. After the instrument automatically boots, it will display equipment type, name and manufacturer information. Then enter the basic measurement status main display interface, as shown.


  1. The last shutdown set content will be displayed in the next boot.
  2. Start-up and shutdown; press and hold the key for about 2 seconds to open the instrument will perform the appropriate action.
  3. Long-time not to use, the instrument should be on the side of the power switch turned off.
  4. Start measuring sensor is installed, please refer to the stylus position and try to adjust the stylus cursor position to the best position “0”.

Stylus Position

First, use the stylus position to determine the location of the sensor. The stylus as measured in the middle position.

In the main interface mode, press the stylus position key switches stylus position display screen and the main display screen.

Start measurement

In the main interface mode, press the Start button to start measuring

Measurement result display

The results of all the measurements can be observed, as seen in the figure

Print measurement results

The instrument can be connected to the printer. The measurement results will be printed. After measurement, Press key to display the measurement results.Press key to print the measured data to a serial printer. At this point, key is a print key to use.The instrument can be tested according to the actual requirements of arbitrary parameters choose to print or print all the parameters.

Storage measurement results

In the main display interface mode, press the key to save the measurement results stored in the instrument memory. Instrument built-in large capacity memory, can store 100 groups of raw data and waveform data.

Data storage recording date and time the file name automatically generated according to the last data record is always stored the most recent recording time, the last data record stored recording record number will be 001.

Measuring parameter Settings

In the basic measurement mode, press thekey to enter the menu operation state, press the keys to select “Preferences” functionand then press the key to enter the parameter setting mode. In the parameter setting mode, you can modify all the measurement conditions.

Storage Management

In the basic measurement mode, press the key to enter the menu operation state, Press the keys to select “Recoder” function, Press the key to enter management projects.

Recoder management by the two project components

  1. View 2. format.

Selected item and press the Enter key to enter.

View Record

Select the appropriate records, press View log content. In view records content, data can be printed according to the specified printer, operate the following figure.


Data format is the deletion of data records, once formatted and all data will be cleared. In the data before formatting instrument has confirmation prompt information, user data will not be restored after confirmation.

Date Settings

Built-in real time clock calendar instrument used to record information about the test of time to adjust date and time as follows

Software Information

Instruments software and hardware information can help users easily upgrade and maintain the product, unique serial number of the instrument software information items are displayed.

Parameter Calibration

Before measuring instrument, standard calibration block is required. The instrument is configured with a standard calibration block, before measurement. Under normal circumstances, when the measured value and the block value of the difference in the acceptable range, the measurement value is valid, can be measured directly.

If the measured value and the block value of the difference is greater than an accuracy error range of the instrument, or the user requires higher accuracy, can be used to correct the indication calibration function and improve measurement accuracy. Showing the value of the calibration procedure as shown.

  1. Under normal circumstances, the instrument in the factory have been rigorously tested, showing error is much less than ±10 %, in this case, the user is not showing the value of the calibration frequently used functions.
  2. After setting the calibration value, you must press the key for a full measurement, instrument calibration to be valid.
  3. New parameters after calibration must be carried out once a complete measurement and press the key is stored in the instrument.
  4. Press “ESC”key to return the menu without saving calibration results.

Print setup

The instrument can be tested according to the actual requirements of any parameter selection Print or Print All, the steps shown in Figure.

Options and Usage

Adjustable Support

When measured surface of part is smaller than the bottom surface of the instrument, sheath of pickup and adjustable supporter of instrument options can be used for auxiliary support to complete the measurement (as shown in Figure).

Measurement Stand

Measurement Stand can adjust the positions between tester and measured part conveniently with flexible and stable operation and wider application range. Roughness of complex shapes can also be measured. Measurement stand enables the adjustment of the position of stylus to be more precise and measurement to be more stable. If Ra value of measured surface is relatively low, using measurement platform is recommended.

Extending Rod

Extending rod increases the depth for pickup to enter the part. Length of extending rod is 1.96 in (50 mm).

Standard Sensor

The standard sensor can measure most of the plane, inclined plane, cone surface, inner hole, groove and other surface roughness. In addition to the standard sensor, other special sensors are needed to measure the measuring platform.

Curved Surface Sensor

Curved surface sensor is mainly used for measuring radius is larger than the smooth cylindrical 3mm surface roughness, for the larger radius smooth spherical surface and other surface also can obtain good approximation, the radius of curvature, the surface is smooth, the better the effect of measurement.

Measuring Range
Parameter Measuring Range
Ra Rq 0.005 μm~16 μm
Rz R3z Ry Rt Rp Rm 0.02 μm~160 μm
Sk 0~100%


0.03 in (1 mm)
tp 0~100%

General Maintenance


  1. Any time swap sensors are to be especially careful, careful not to touch the guide head and a stylus, because this is a key part of the whole instrument, to try to hold the sensor guide head bracket roots (the front of the body) plug.
  2. To complete the measurement work, please timely sensor into the box;
  3. Please pay attention to protect the needle part measuring sensor.
  4. The sensor’s precision components, any knock, touch, fall off phenomenon may damage the sensor, should try to avoid such situations.
  5. The sensor is a damageable parts, do not belong to the scope of warranty parts, only provide repair. In order not to affect the measurement work, users are advised to buy backup sensor used for emergency.

Main Unit

  1. Pay attention to maintaining the Main Unit surface clean. Use a soft dry cloth to clean its surface.
  2. The instrument is a precision measuring instrument. It should always be handled with care, to avoid the
  1. Always observe the battery prompt, when the low voltage, please
  2. The charging time is 3 hours. Do not try to charge for a long time .

Standard Sample Plate

  1. The surface of a standard sample plate must be kept clean.
  2. To avoid scratches on the surface of sample area.


When the tester breaks down, handle the troubles according to measures described on Fault Information. If troubles still exist, please return the instrument to factory for repair. Users should not dismantle and repair the device by themselves.

Error message Cause Solutions method
Motor error Motor stuck Reboot
Out of Range 1. The measured surface signal exceeding the measurement range

2. Placed away from the center of the stylus position

Increase Measuring range

Adjust the Stylus position

No test data After the boot does not measure. The actual measurement: one time
Measurement Accuracy Set the parameter error Set the parameter measurement
Out of Range Calibration data error Calibrate the tester


Number Name Quantity Remarks
1 Main Unit 1
2 Sensor 1 Precision parts
3 Sheath of Sensor 1
4 Adjustable Support 1
5 calibration block 1
6 block bracket 1
7 Charger 1
8 USB charging cable 1
9 Operating manual 1
10 Certificate 1
11 Guarantee card 1
12 Instrument container 1
13 Thermal printer Optional accessories


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