LCR Meter with DC Super-Impact Protection (VFD Display)

This high performance LCR Meter with DC Super-Impact Protection with a clearly visible VFD display comes with a high speed comparator which reduces production line tact time and allows the construction of automatic production lines



GAOTek LCR Meter with DC Super-Impact Protection (VFD Display) features high performance and high-speed built-in comparator which significantly reduces production line tact time and allows the construction of automatic production lines. The basic accuracy of 0.1 % makes it suitable for use on production lines and laboratories. The very compact body features a clearly visible VFD display that facilitates easy operation and allows settings to be confirmed at a glance.

Key Features

  • 3-line VFD Display
  • Correction: OPEN and SHORT
  • View: ΔABS, Δ% or sorting result on 3rd Line
  • Comparator Function: 20 files, P1, P2, P3, NG, AUX, HI, IN, LO
  • Interface: RS-232C and Handler
  • Optional Interface: USB
  • 1000 V DC Super-impact protection
  • Key lock function
  • Data Hold function

Technical Specifications

Parameters L, C, R, Z, D, Q, θ (deg), θ(rad)
Monitor Parameters D, Q, θ (deg), θ(rad)
Accuracy 0.1 %
Frequency 100 Hz, 120 Hz, 1 kHz, 10 kHz
Display Range θ(rad): -3.1416 – 3.1416 Δ %: -9999 % – 9999 % D: 0.0001 ~ 9.9999° Q: 0.0001 – 9999 θ (deg): -90.00°- 90.00 °WL: 0.01 μH-9999 H C: 0.01 pF – 9999 μF R,Z: 0.0001 Ω – 99.99 MΩ
Source Resistance 30 Ω 100 Ω
Range Automatic and manual with 6 ranges
Display Max principle parameter: 99999; sub parameter: 99999
Signal Level 0.1V rms, 0.3 Vrms, 1 Vrms
Speed 15 times/second, 5 times/second, 3 times/second
Comparator 20 groups files record, 5-bin sorting, beep indication
Adjustment Open & short sweep frequency and point frequency
Interface RS-232C (SCPI programmable language) Handler interface

VFD Display, keypad lock and data hold function
Voltage: 198 V AC – 250 V AC Frequency: 50 Hz Power: Max 15 VA
Dimensions 10.39 in x 4.21 in x 13.78 in (264 mm x 107 mm x 350 mm)
Weight   8.81 lbs (4 kg)

Unpacking & Removing Handle

Front Panel

Front Panel Description:

No Description
1 USB Disk Port (USB-Host)
2 Trigger key
3 Power Switch
4 System Key (include File, System and Key Lock)
5 Soft Key
6 Menu Key
7 UNKNOWN Terminal
8 Entry Key
9 Cursor Key
10 LCD Display

Rear Panel

Real Panel Description:

No. Description
1 Frame Terminal
2 Option Slot
3 Power Cable receptacle(Outlet)(to LINE)
4 RS-232 Interface
5 Handler Interface

Power On/Off:

Power on:

Press the power key for 2 seconds and release the key the triggered LED lit.

Power Off:

Press the power key for 2 seconds and release the key the device will shut down.

Warm‐up Time:               

As soon as the power-up sequence has completed the instrument is ready to use. However, to achieve the accurate rating, warm up the instrument for 30 minutes.

Connect to Device under Test (DUT)

The device uses four terminal measurements that provides accurate and stable measurements, avoids mutual inductance, interference from measurement signals, noise and other factors inherent with other types of connections.

  • Do not apply DC voltage or current to the unknown terminals.
  • Applying DC voltage or current may lead to device failure.
  • After the LCR meter has been completely discharged connect the measurement sample (DUT) to the test port (or the text fixture, cables etc. connected to the test port).


Auto, Hold and Nominal range. Total 9 Ranges.

Measurement Speed   

Fast: 30 readers per second;

Medium 2:10 readers per second;

Medium 1: 5 readers per second;

Slow: 1.5 readers per second.

Simultaneously, you can specify the averaging factor within the range of 1 to 256 in steps of 1. Averaging Factor to improve performance.

Measurement Range


Measurement Range

L 0.001 nH ~ 9999.99 H
C 0.001 pF ~ 9999.99 mF
R, X, Z 0.00001 Ω ~ 99.9999 MΩ
B, G 0.01 nS ~ 999.999 S
D 0.00001 ~ 9.99999
Q 0.00001 ~ 99999.9
Θd -179.999° ~179.999°
Θr -3.14159 ~3.14159
% -999.999 % ~999.999 %

Trigger Mode   

Include Internal, Manual, External and Bus Trigger.

Test Signal Level

0.01 V ~2.00 Vrms, 0.01 V resolution.

Main Functions

Correction Function      

OPEN/SHORT correction:

Eliminates measurement errors due to stray parasitic impedance in the test fixtures.

LOAD correction

Improves measurement accuracy by using a calibrated device as a reference

Comparator Function (Sorting)

Bin sort

The primary parameter can be sorted into BIN1-BIN9, AUX, OUT and HI/IN/LO for each of the primary measurement parameters.

The sequential mode or tolerance mode can be selected as the sorting mode.

Limit Setup

Absolute value, deviation value, and % deviation value can be used for setup.

BIN count

Countable from 0 to 999999

List Sweep Points 

There is a maximum of 10 points

Sweep parameter

Test frequency, test signal voltage

Comparator function of list sweep

The comparator function enables you to set one pair of lower and upper limits for each measurement point.

You can select from: Judge with the first sweep parameter/Judge with the second parameter/not used for each pair of limits.

Measurement Assistance functions:


Up to 10 setup conditions can be written to or read from the built-in non-volatile memory.

Key Lock:

The front panel keys can be locked.


Complies with SCPI


USB host Port

Universal serial bus jack, type-A (4 contact positions, contact 1 is on your left);

Female: Connection to USB memory device

DC Bias Voltage

0 V/1.5 V/2 V


Press the [Meas] key, the <MEAS DISPLAY> page appears in the screen.

Set the following measurement controls.

  • FUNC – Measurement Function
  • RANGE – Impedance range
  • FREQ – Test Frequency
  • TRIG – Trigger Mode
  • LEVEL – Test Signal Level
  • SPEED – Meas Speed

Measurement Function [FUNC]:

The LCR meter simultaneously measures four components of the complex impedance (parameters) in a measurement cycle. These include primary parameter, secondary parameter and two monitor parameter.


  • The monitor parameters can be set in <SETUP> page.
  • The monitor parameters are initially set to OFF.

Types of measurement parameters:

Combinations of measurement parameters

Cs-Rs Cs-D Cp-Rp Cp-D
Lp-Rp Lp-Q Ls-Rs Ls-Q
R-Q R-X Z-Ɵr Z- Ɵd

Monitor parameters:

Monitor parameters:

Ɵr Ɵd R X
Vac Iac
Δ Δ%

Measurement and Monitor Parameters:

Parameter Description
Cs Capacitance value measured using the series equivalent circuit model
Cp Capacitance value measured using the parallel equivalent circuit model
Ls Inductance value measured using the series equivalent circuit model
Lp Inductance value measured using the parallel equivalent circuit model
Rs Equivalent series resistance measured using the series equivalent circuit model (ESR)
Rp Equivalent parallel resistance measured using the parallel equivalent circuit model
Z Absolute value of impedance
Y Absolute value of admittance
G Conductance
B Sustenance
R Resistance (=Rs)
X Reactance
D Dissipation factor
Q Quality factor(=1/D)
Ɵr Phase radian
Ɵd Phase angle
Vac Test signal Voltage
Iac Test signal Current
Δ Absolute deviation value
Δ% Relative deviation value

Procedure for setting the measurement function [FUNC]

Step 1. Press the [Meas] key

Step 2. Press the <MEAS DISPLAY> soft key

Step 3. Use the cursor key to select [FUNC] field

Step 4. Use the soft keys to select measurement function

Impedance Range [RANGE]


Function Overview



Auto range Sets the optimum range automatic for the impedance for the DUT Automatic selection of range The measurement time is longer due to the ranging time
Hold range Measurement is performed with a fixed impedance range No ranging time is required Select a proper range depending on the value of the DUT
Nominal Range Sets the optimum range depending on the nominal value Automatic selection of range. No ranging time is required


Valid only in the sorting mode

Available impedance range

The hold range has nine impedance ranges: 10Ω, 30 Ω, 100 Ω, 300 Ω, 1 kΩ, 3 kΩ, 10 kΩ, 30 kΩ and 100 kΩ. The impedance range is selected according to the DUT’s impedance even if the measurement parameter is capacitance or inductance.

Range No. Impedance range Effective measurement range
8 10 Ω 0 – 10 Ω
7 30 Ω 10 Ω – 100 Ω
6 100 Ω 100 Ω – 316 Ω
5 300 Ω 316 Ω – 1 kΩ
4 1 kΩ 1 kΩ- 3.16 kΩ
3 3 kΩ 3.16 kΩ – 10 kΩ
2 10 kΩ 10 kΩ – 31.6 kΩ
1 30 kΩ 31.6 kΩ – 100 kΩ (∞)
0 100 kΩ 100 kΩ (-∞)

Procedure for setting the impedance range [RANGE]

Step 1. Press the [Meas] key

Step 2. Use the cursor key to select [RANGE] field

Step 3. Use the soft keys to select the impedance range mode or impedance range.

Soft key Function




INCR + Increments the impedance range in the HOLD mode

DECR – Decrements the impedance range in the HOLD mode

Testing Frequency [FREQ]


Frequency range and test frequency point

Frequency Range Resolution
10.0000 Hz ≤ F ≤ 99.9999 Hz 0.0001 Hz
100.0000 Hz ≤ F ≤ 999.999 Hz 0.001 Hz
1.00000 Hz ≤ F ≤ 9.99999 kHz 0.01 Hz
10.0000 kHz ≤ F ≤ 20.0000 kHz 0.1 Hz

Test Frequency that can be set using INCR++/DECR— 

10 Hz 50 Hz 60 Hz 100 Hz 120 Hz
1 kHZ 10 kHz 20 kHZ

Trigger Mode [TRIG]

It supports four trigger modes: INT (internal), EXT (external), MAN (manual)

Procedure for choosing trigger mode [TRIG]

Step 1. Press the [Meas] key

Step 2. Use the cursor key to select [TRIG] field

Step 3. Use the soft keys to select desired trigger mode

Test Signal Voltage Level [LEVEL]

The test signal voltage level can be set as the effective value (RMS value) of a sinewave of the test frequency from the unit’s internal oscillator.

The output impedance can be set to 30Ώ, 50 Ώ or 100 Ώ.

Test signal level setting procedure

Step 1. Press the [Meas] key

Step 2. Use the cursor key to select [LEVEL] field

Step 3. Use the soft keys or numeric entry keys to enter the test signal voltage level

Measurement Speed [SPEED]

SLOW, MED 1, MED 2 and FAST can be selected.

SLOW mode will result in more stable and accurate measurement result.

Procedure for setting measurement speed mode

Step 1. Press the [Meas] key

Step 2. Use the cursor key to select [SPEED] field

Step 3. Use the soft keys to set measurement speed


When press [Meas] key and [BIN No.] soft key, the <BIN No. DISPLAY> page appears.

The bin sorting results are displayed in larger characters while the measurement results

are shown in normal characters.

Figure 4‐2 <BIN No. DISPLAY> page

Above image provides the following information:

FUNC, RANGE, FREQ, LEVEL, TRIG, LEVEL, SPEED: These conditions can[Meas] Key be set from <MEAS DISPLAY> page.

  • Comparator function ON/OFF [COMP]
  • Auxiliary bin ON/OFF [AUX]


When press the [Meas] key and [BIN COUNT] soft key, the <BIN COUNT DISPLAY >page appears.

This page provides the following information:

Counter function [COUNT]

Counter Function [COUNT]

The number of devices sorted into each bin is counted while unit sorts the devices into appropriate bins using the comparator function.

The maximum count is 999999, the counting operation stops and the overflow message

“——” appears when this value is reached.

Set the Counter:

Press the [Meas] key

Press the <MEAS DISPLAY> soft key

Use the cursor key to select [COUNT] field

Comparator Function ON/OFF:

Built-in comparator can sort devices into a maximum of 10 bins (BIN1 to BIN9 and OUT) using a maximum of nine pairs of primary parameter limits and one pair of secondary parameter limits.  The device which is primary parameter is within limits, but is not in secondary parameter can be sorted into an auxiliary BIN (AUX).

Comparator workflow:


To open the <LIST SWEEP SETUP> page press the [Setup] and [LIST SETUP] soft key. This LCR meter can perform automatic sweep measurement by sweeping the frequency and the signal level through a maximum of 10 sweep points.

Following information can be configured in the <<LIST SWEEP SETUP> page.

  • Sweep trigger mode [TRIG]
  • Sweep parameter selection [FREQ [Hz], LEVEL [V]]
  • Limit parameter selection [LMT]
  • Lower and upper limits [LOW] [HIGH]

Trig Mode Function
INT Internal Trigger. All ten sweep points are swept continuously.
MAN Manual Trigger. Each time the instrument is triggered by [Trig] key, the sweep points are swept one by one.
EXT External Trigger. Each time the instrument is triggered by the handler trigger pin, the sweep points are swept one by one.
BUS BUS Trigger. Each time the instrument is triggered by SCPI command, the sweep points are swept one by one.

<SYSTEM CONFIG>Page              

When press the [Meas] or [Setup] key followed by [SYSTEM] bottom soft key, the <SYSTEM CONFIG> page appears.

Following information can be configured in the <SYSTEM CONFIG> page.

  • System date and time configuration [DATE/TIME]
  • Account settings [ACCOUNT]
  • Beep setting [BEEP]
  • Beep tone[TONE]
  • RS-232 Baud rate setting [BAUD]


When you press [Setup] key and [CORRECTION] soft key, the <CORRECTION> page appears.

  • In this page, the OPEN/SHORT/LOAD correction for correcting the stray admittance and residual impedances can be performed.
  • The correction function has two kinds of correction methods. In one method the open and short correction can be performed at all of the frequency points using the

Interpolation method, and in the other method the open, short, and load correction can be performed at the frequency points you specify.

In <CORRECTION> page, you can configure each of the following controls with the cursor placed in the corresponding field.

Open correction [OPEN]

Short correction [SHORT]

Load correction [LOAD]

Frequency 1, 2, 3 for OPEN, SHORT, LOAD Correction [FREQ 1] [FREQ 2] [FREQ3]

Open correction [OPEN]

OPEN correction capability cancels errors due to the stray admittance (G,B) in parallel with the device under test.

Stray Admittance

The OPEN correction data is taken at all preset frequency points, independent of the test frequency you set.

Handler Interface           

This section provides information of micro ohmmeter built-in handler interface. Include:

  • Pin Assignment
  • Circuit Diagram
  • Timing Chart

Built-in handler interface outputs signals that indicate the end of a measurement cycle, the result of bin sorting by the comparator. In addition, the instrument accepts input of external trigger. To view the signals easily integrate this instrument with a component handler or system controller. This means it can be fully automated the tasks component inspection, component sorting, and processing of quality management data for higher manufacturing efficiency

Pin Assignment





1 /BIN1 Output Result of sorting is based on Open-collector.

If EX-V2 signal was connected with EX-VCC, a built-in 5 kΩ pull-up resistance is used.


2 /BIN2 Output
3 /BIN3 Output
4 /BIN4 Output
5 /BIN5 Output
6 /BIN6 Output
7 /BIN7 Output
8 /BIN8 Output
9 /BIN9 Output
10 /OUT Output
11 /AUX Output
12 Trig-8V Input An external trigger signal for 8 V EX-VCC. The pin is connected when EX-VCC = 5 V ~8V.
13 Trig-24V Input An external trigger signal for 24V EX-VCC. The pin is connected when EX-VCC=8 V ~24 V
14 EX-V2 Power External DC Voltage.
15 The power of built-in 5 kΩ pull-up resistance of the output signals.
19 /PHI Output “Primary parameter beyond upper limit” signal. Output of this signal is generated when the primary parameter exceeded the upper limit for bins 1 to 9.
20 /PLO Output “Primary parameter below lower limit” signal. Output of this signal is generated when the primary parameter is below the lower limit for bins 1 to 9.
21 /SREJ Output “Secondary parameter out of limits” signal. Output of this signal is generated when the secondary parameter is out the limits.
27 EX-VCC Power External DC Voltage. Supplies voltage for DC isolation input signal (/TRIG8V, /TRIG24V)
28 EX-V1 Power External DC Voltage. Supplies voltage for IDX and EOM signal pull-up resistance.
30 /IDX Output “End of analog measurement” signal. Output of this signal is generated when analog measurement is complete. This means that once the handler has received this signal, the next DUT can be connected to the UNKNOWN terminal. However, measurement data are not available until the /EOM signal is output.
31 /EOM Output “End of measurement cycle” signal. When the output of this signal is generated, the measurement data and sorting results are available
32 EX-COM2 Power Common signals for external DC current EX-V2


EX-COM Power Common signal for external DC current EX-VCC


EX-COM1 Power Common signals for external DC current EX-V1.

Power Rating:

Input/output device Logic Electrical requirements
OUTPUT Connector out with pull-up resistance Negative logic 35 VDC

50 mADC max

INPUT Rising-edge 50 mADC max
EXT.DCV DC voltage input 35 VDC max

Electrical Characteristics:

Input Signal:

  • Each input signal is connected to the LED (cathode side) of the photo-coupler.
  • The LED (anode side) is connected to the pull-up power supply voltage.

Output Signal:

  • Each output signal is generated via an open collector by using a photo-coupler.
  • The voltage of each output is obtained by connecting pull-up resistors, inside or outside of the device.

Power Supply

Power supply can be selected from external power supply +3.3 V to +3.5 V.


Typical Circuit Diagram of Handler Interface Input Signals:

Typical Circuit Diagram of Handler Interface Output Signals:

Timing chart:


Basic Measurement procedure:

The following flow chart shows the basic procedures used to measure the impedance of capacitors, inductors, resistors, and other components.

Remote Control:

About RS-232C

Connect the controller i.e.) PC and PLC to the RS-232 interface using RS-232 DB-9 cable. The serial port uses the transmitter, receiver and signal ground lines with RS-232 standard. It does not use the hardware handshaking lines CTS and RTS.


  • Use only DB-9 cable
  • Cable length should not exceed 2 m.

RS-232 connector in the real panel

RS-232 connector pinout:





DCD 8 1 No connection
RXD 3 2 Transmit data
TXD 2 3 Receive data
DTR 20 4 No connection
GND 7 5 Ground
DSR 6 6 No connection
RTS 4 7 No connection
CTS 5 8 No connection

About USB-Serial Interface (OPTION)

The USB-Serial Interface allows you to connect LCR meter to a USB port on your PC.

To Select Baud Rate:     

Before controlling the LCR meter by issuing RS-232 commands from built-in RS-232 controller connected via DB-9 connector, configure the RS-232 baud rate.

This instrument’s built-in RS-232 interface uses the SCPI language.

RS-232 configuration is as follows:

  • Data bits: 8-bit
  • Stop bits: 1-bit
  • Parity: none

To set up the baud rate

Step 1. Press the [Meas] or [Setup] key

Step 2. Press the [SYSTEM] bottom soft key

Step 3. Use the cursor key to select [BAUD] field

Step 4. Use the soft keys to select baud rate

Soft key Function
115200 Recommended, system default

 USB-Serial interface:

The USB-Serial Interface is used to connect the device via USB port to the PC. The device can be controlled using USB port.

Installing USB-Serial drivers on Windows XP:

  • Install the USB-Serial driver before using USB-Serial Interface.
  • Connect the USB-Serial Interface to the USB port on the PC.
  • Windows XP launch the window “Found New Hardware Wizard”
  • Select “No not this time” option and click “Next” to proceed for installation.
  • Select the option “Install from a list or specific location (Advanced)” and then click “Next”.
  • Select the option “Search for the best driver in this location” and browse the location by clicking browse button. Once the file path selected, click next to proceed.
  • Completing the Found New hardware Wizard.
  • Click “Finish” to complete the installation for the first port of the device.
  • The “Found New hardware Wizard will continue by installing the USB-Serial Converter driver for the second port of the device.
  • Open the Device Manager (located in “Control PanelSystem” then Select the “Hardware” tab and click “Device Manager”) and select “View > Devices by connection”, the device appears as a USB Serial Converter” with an additional COM port with the label “USB Serial Port”.
  • Figure shows the USB Serial Port.

SCPI Language:

Standard commands for programmable Instruments (SCPI) are fully supported by the RS-232 interface.

Command Structure:

LCR meter commands are divided into two types:

  • Common commands
  • SCPI commands

Common commands are common for all devices. SCPI commands are used to control the each LCR meter functions. The SCPI commands are represented using tree structure in three levels. The highest level commands are called the subsystem commands and the lower level commands are legal only when the subsystem commands have been selected.

Colon (:) A colon is used to separate the higher level commands and the lower level commands.

Semicolon (;) A semicolon is used to separate two commands in the same message and it does not change the current path.

Command Tree Example:

All commands follow the functional command order.

  • DISPlay Subsystem
  • FUNCtion Subsystem
  • FREQuency Subsystem
  • VOLTage Subsystem
  • APERture Subsystem
  • FETCh Subsystem
  • COMParator Subsystem
  • LIST Subsystem
  • CORRection Subsystem
  • TRIGger Subsystem
  • BIAS Subsystem
  • FILE Subsystem
  • ERRor Subsystem

Common Command:

  • *TRG
  • *IDN?
  • *SAV
  • *RCL

Each subsystem command is patterned as follows.

  1. Subsystem command name
  2. Command Tree (Subsystem command only)
  3. Compound Command Name
  4. Command Description
  5. Command Syntax
  6. Example Using the Above Command Syntax
  7. Query Syntax
  8. Query Response
  9. Example Using the Above Query Syntax
  10. Constraints




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