Micro ohmmeter with data hold (Remote trigger)

This Micro Ohmmeter with data hold and remote trigger is designed to measure high, medium and low value resistances for a wide measuring range from  0.001 mΩ ~ 20.100 MΩ



Key Features

  • Measuring range from 0.001 mΩ ~ 20.100 MΩ
  • Fully-automatic real-time testing with 0.05 % accuracy
  • Measurement Speed: 80 times/s, 15 times/s , 2 times/s
  • Trigger Mode: Internal, manual, external and remote trigger
  • Basic Accuracy
  • Comparator Function (Sorting): Stores up to 30 groups
  • High brightness, clear VFD Display
  • Correction Function
  • Maximum sampling rate is 7 ms
  • RS-232 interface
  • Zero setting function
  • Beep feature
  • Four terminal resistance test
  • High current test mode (Open voltage <20 mV)
  • HI/IN/LOW/GD/NG sorting
  • With built-in temperature compensation interface to reduce the tolerance
  • Data hold function
  • Keypad lock function
  • SCPI compatible command sets
  • GPIB Interface (optional)



Technical Specifications

ParameterDC Resistance
InterfaceRS-232 interface, Handler interface, Temperature compensation interface
Measurement Range0.001 mΩ ~ 20.100 MΩ
Measurement SpeedRange Hold Mode:
Ultra (Display off)140 readers/second (7 ms)
Ultra67 readers/second (15 ms)
Fast35 readers/second (83 ms)
 Medium12 readers/second (83 ms)
 Slow2 readers/second
Display Mode3.5” (89 mm) True color TFT-LCD
Programming LanguageSCPI
Range10 ranges, Auto, Hold and Nominal range
Nominal RangesAutomatic Selection
Display Digits5
Correction FunctionSHORT-CIRCUIT Clear Zero
Comparator10 bins GD

3 bins HI/IN/LO

Beep FeatureOFF/GD/NG
Trigger ModeInternal, Manual, External and Bus Trigger
AccuracySlow speed0.05 %
Medium speed0.1 %
Fast and Ultra speed0.5 %
Power Supply110 V /220 V AC
Frequency48.5 Hz ~ 62.5 Hz
Maximum Power20 VA
Fuse1 A Slow-Blow
Accurate Temperature73.4 ˚F ± 41 ˚F (23 ˚C ± 5 ˚C)
Accurate Humidity≤ 65 % RH
Warm Up Time>30 minutes
Weight7.72 lbs. (3.5 kg) net
DimensionsOutside dimension10.39 in x 4.21 in x 13.78 in (264 mm x 107 mm x 350 mm)
Inside dimension8.50 in x 3.46 in x 12.72 in (216 mm x 88 mm x 323 mm)
Working Temperature59 ˚F to 95 ˚F (15 ˚C to 35 ˚C)
Working Humidity≤ 80 % RH
Storage Temperature50 ˚F to 104 ˚F (10 ˚C to 40 ˚C)
Storage Humidity10 % ~ 90 % RH




  • Suitable for all kinds of high, middle and low resistor
  • Contact resistance of the switches
  • Contact resistance of all kinds of connector
  • Resistance of motor and transformer
  • Windings
  • Enamel-insulated wire resistance
  • Relay/switch connector contacts
  • PCB patterns
  • Chip inductor DC resistance
  • Wire Resistance
  • Car, ship and plane fasten or secure resistance

Front panel

Front panel Description:

1USB Disk Port (USB-Host)
2Trigger Key
3Power Switch
4System Key (Include File, System and Key Lock)
5Soft Key
6Menu key
7UNKNOWN Terminal
8Entry Key
9Cursor Key
10LCD Display

Real Panel:

Real Panel Description:

1RS-232C Interface
2Handler Interface
3Temperature Compensation Interface
4AC Power Cord Receptacle

 Power On/Off       

Line Power Connection       

Power ON

Power OFF

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)          

  • Red logo testing BNC cables into the H in the first rotation.
  • Black logo testing BNC cables into the L in the first rotation.
  • Red cable to test the high-pot.
  • Black cable to test the low-pot.

Fig shows Connect to DUT

Main Functions:

Correction Function

SHORT correction:

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

Comparator Function (Sorting)

Bin sort:

The primary parameter can be sorted into BIN1-BIN9, and HI/IN/LO.

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.

Measurement Assistance Functions

 Key Lock            

The front panel keys can be locked.


Complies with SCPI.



 When press the [Meas] key, the <MEAS DISPLAY> page appears.

The following measurement controls can be set.

  • TRIG – Trigger Mode
  • COMP – Turn the comparator ON/OFF
  • RANGE – Measurement Range
  • SPEED – Measurement Speed

Trigger Mode [TRIG]

SCPI Command: TRIGger: SOURce {INT, MAN, EXT, BUS}

This instrument supports four trigger modes: INT (internal), EXT (external), MAN (manual) and BUS (RS-232).

Trigger ModeDescription
INTRepeats the measurement cycle continuously
MANPerforms one cycle of measurement each time pressing the [Trig] key
BUSPerforms one cycle of measurement each time it receives a trigger command sent via RS-232.
EXTPerforms one cycle of measurement each time a rising pulse is input to the handler external trigger input pin on the rear panel.
LEVELRepeats the measurement cycle continuously while the trigger signal is LOW level

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.

Soft keyFunction
INTInternal Trigger Mode
MANManual Trigger Mode
BUSBUS Trigger Mode
EXTExternal Trigger Mode

Range [RANGE]      

ModeFunction OverviewAdvantageDisadvantage
Auto rangeSets the optimum range automatic.Automatic selection of rangeThe measurement time is longer due to the ranging time
Hold rangeMeasurement is performed with a fixed rangeNo ranging time is requiredSelect a proper range depending on the value of the DUT.
Nominal Rangesets the optimum range depending on the nominal valueAutomatic selection of range. No ranging time is required


 Effective Measurement Range

Range No.RangeMeasurement RangeUpDown
010 mΩ0.0000mΩ~30.000mΩ




















1100 mΩ29.000mΩ~300.00mΩ
21 Ω290.00mΩ~3.0000Ω
310 Ω2.9000Ω~30.000Ω
4100 Ω29.000Ω~300.00Ω
51 kΩ290.00Ω~3.0000kΩ
610 kΩ2.9000kΩ~30.000kΩ
7100 kΩ29.000kΩ~300.00kΩ
81 mΩ290.00kΩ~3.0000MΩ
910 mΩ2.9000MΩ~20.000MΩ

Procedure for setting the 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 range mode or range.

Soft keyFunction
INCR+Increments the range in the HOLD mode
DECR_Decrements the range in the HOLD mode

Comparator Bins [COMP]

This Micro ohmmeter has built-in comparator can sort devices into a maximum of 10 bins (BIN1 to BIN9 and NG) using a maximum of 10 pairs limits

Comparator Workflow

Procedure for setting the comparator function [COMP]

Step 1. Press the [Meas] key

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

Step 3. Use the soft keys to turn on/off the comparator

When in ULTRA (DISP OFF) mode, “DISPLAY OFF” will appear on the screen.

Short‐circuit Clear Zero       

SCPI Command: CORRect: SHORt

The short correction of this micro ohmmeter compensates for any residual resistance that may exist within the interval from the calibration plane, which is determined by the selected cable length, to the DUT connecting points as shown in the figure.

To perform short correction

Step 1. Press the [Setup] key

Step 2. Press the [Clear Zero] soft key.

Step 3.Press the [MEAS SHORT] soft key, a dialog message display “Short-circuit the test terminals”. The test clips short-circuit should be placed in the following way:

Step: 5: Press the [OK] soft key.

  • The micro ohmmeter measures the short resistance for all ranges.
  • During the measurement, “SHORT measurement in progress” dialog message is shown on the display.
  • When the measurement has finished, a message “Correction finished” is displayed.

<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]
  • RS-232 Baud rate setting [BAUD]
  • RS-232 Shake Hand [SHAKE HAND]
  • RS-232 Result Send Mode [RESULT SEND]

 <SYSTEM CONFIG> Page          

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

Description of Handler Interface Signals:

7/EOCOutput“End of measurement cycle” signal. When it signals the output, the measurement data and sorting results are available.
18TriggerOutputRising-Edge, 5 V~24 V
27-28Internal GNDPowerInternal GND

Common signal of internal VCC.

29-30External GNDPowerExternal GND

Common signal for external DC current External VCC

33-34Internal VCCPowerInternal VCC (5VDC)
35-36External VCCPowerExternal VCC (3.3V~35V)

Supplies voltage for DC isolation input signal

Power Rating:

Input/output deviceLogicElectrical requirements
OUTPUTConnector out with pull-up resistanceNegative logic35 V DC

50 mA DC max

INPUTRising-edge50 mA DC max
EXT.DCVDC voltage input35 V DC max
INT.DCVBuilt-in VCC5 V DC,1A 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 signal is output via a pull-up 5 kΩ (0.1 W) resistor by using a photo-coupler.

Power supply:

The power supply output signal pull-up, the operation output signal pull-up and input signal drive can be set separately. External power supply can be selected from +3.3V to +35V. An internal VCC (5V DC) has been supplied for testing purpose. To use the internal power, connect PIN-34 and PIN-35 together and PIN-28 and PIN-29 together.

Typical Circuit Diagram of Handler Interface Input signals.

Typical Circuit Diagram of Handler Interface output signals.

Remote Control

This section provides the following information to remotely control the micro ohmmeter via the RS-232C or USB interface.

  • About RS-232C
  • About USB Interface
  • Select Baud Rate.
  • About SCPI

This instrument can use the RS-232 interface or USB interface to communicate with the computer to complete all the instrument functions.

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 transmit (TXD), receive (RXD) and signal ground (GND) lines of the RS-232 standard. It does not use the hardware handshaking lines CTS and RTS.

The RS-232 interface transfers data using:  8 data bits, 1 stop bit, and no parity.

 NOTE: Cable length should not exceed 2m.

RS-232 in the real panel

About USB‐Serial Interface (Option)          

The USB-Serial Interface allows you to connect this micro ohmmeter to a USB port on your PC.

To Select Baud Rate:     

Before controlling the micro ohmmeter 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.


How to remove the handle

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