GW Instek GDM-8200A User Manual
Digital Multimeter
GDM-8200A Series
USER MANUAL
GW INSTEK PART NO. 82DM-8255AE E1
ISO-9001 CERTIFIED MANUFACTURER
March 2013
This manual contains proprietary information, which is protected by
copyrights. All rights are reserved. No part of this manual may be
photocopied, reproduced or translated to another language without
prior written consent of Good Will company.
The information in this manual was correct at the time of printing.
However, Good Will continues to improve products and reserves
the right to change specifications, equipment, and maintenance
procedures at any time without notice.
Good Will Instrument Co., Ltd.
No. 7-1, Jhongsing Rd., Tucheng Dist., New Taipei City 236, Taiwan.
Table of Contents
Table of Contents
SAFETY INSTRUCTIONS .................................................... 5
Safety Symbols .................................................... 5
Safety Guidelines ................................................ 6
GETTING STARTED ............................................................ 9
GDM-8200A Series Lineup ................................ 10
GDM-8200A Series Characteristics ................... 11
Front Panel Overview ........................................ 12
Rear Panel Overview ......................................... 17
Set Up ............................................................... 19
BASIC MEASUREMENT .................................................... 21
Basic Measurement Overview ........................... 22
AC/DC/AC+DC Voltage Measurement .............. 24
AC/DC/AC+DC Current Measurement .............. 28
2W/4W Resistance Measurement ..................... 30
Diode Test ......................................................... 32
Continuity Test .................................................. 33
Frequency/Period Measurement ....................... 36
Temperature Measurement ............................... 37
ADVANCED MEASUREMENT ........................................... 40
Advanced Measurement Overview .................... 41
dBm/dB Measurement ...................................... 43
Max/Min Measurement..................................... 45
Relative Value Measurement ............................. 46
Hold Measurement ........................................... 48
Compare Measurement ..................................... 49
Math Measurement ........................................... 52
Dual Display Measurement ............................... 55
SYSTEM/DISPLAY CONFIGURATION .............................. 57
Refresh Rate Setting .......................................... 58
Trigger Setting ................................................... 59
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GDM-8200A Series User Manual
Digital Filter Setting .......................................... 62
Display Setting .................................................. 64
STORE/RECALL ............................................................... 66
Store Measurement Record ............................... 67
Recall Measurement Record .............................. 68
Save Instrument Settings .................................. 69
Recall Instrument Settings ................................ 70
SCANNER (OPTIONAL) .................................................. 71
GDM-SC1 Scanner Specifications ..................... 72
Scanner Installation .......................................... 72
Setup Scan ........................................................ 80
Run Scan ........................................................... 87
DIGITAL I/O .................................................................... 90
Digital I/O Terminal Configuration ................... 91
REMOTE CONTROL ........................................................ 95
Configure Interface ............................................ 96
Command Syntax .............................................. 99
Command Set .................................................. 100
FAQ ................................................................................ 109
APPENDIX ...................................................................... 110
Firmware Version ............................................ 111
Fuse Replacement ........................................... 112
Specifications .................................................. 114
EC Declaration of Conformity .......................... 121
INDEX ............................................................................ 122
4
SAFETY INSTRUCTIONS
WARNING
Warning: Identifies conditions or practices that could
result in injury or loss of life.
CAUTION
Caution: Identifies conditions or practices that could
result in damage to the GDM-8200A series or to other
properties.
DANGER High Voltage
Attention Refer to the Manual
Protective Conductor Terminal
Earth (ground) Terminal
SAFETY INSTRUCTIONS
This chapter contains important safety instructions that
you must follow when operating the GDM-8200A series
and when keeping them in storage. Read the following
before any operation to insure your safety and to keep
the best condition for the GDM-8200A series.
Safety Symbols
These safety symbols may appear in this manual or on the GDM-8200A
series.
5
GDM-8200A Series User Manual
General Guideline
CAUTION
Make sure that the voltage input level does not exceed
DC1000V/AC750V.
Make sure the current input level does not exceed 10A.
Do not place any heavy object on the GDM-8200A
series.
Avoid severe impacts or rough handling that leads to
damaging the GDM-8200A series.
Do not discharge static electricity to the GDM-8200A
series.
Use only mating connectors, not bare wires, for the
terminals.
Do not block or obstruct the cooling fan vent opening.
Do not perform measurement at the source of
low-voltage installation or at building installations
(Note below).
Do not disassemble the GDM-8200A series unless you
are qualified as service personnel.
(Note) EN 61010-1:2001 specifies the measurement categories and
their requirements as follows. The GDM-8200A series fall under
category I or II.
Measurement category IV is for measurement performed at the
source of low-voltage installation.
Measurement category III is for measurement performed in the
building installation.
Measurement category II is for measurement performed on the
circuits directly connected to the low voltage installation.
Measurement category I is for measurements performed on circuits
not directly connected to Mains.
Power Supply
WARNING
AC Input voltage: 100–240 V AC, 50–60Hz
The power supply voltage should not fluctuate more
than 10%.
Connect the protective grounding conductor of the
AC power cord to an earth ground, to avoid electrical
shock.
Safety Guidelines
6
SAFETY INSTRUCTIONS
Fuse
WARNING
Fuse type: T3.15A/ 250V
Make sure the correct type of fuse is installed before
power up.
To ensure fire protection, replace the fuse only with
the specified type and rating.
Disconnect the power cord before fuse replacement.
Make sure the cause of fuse blowout is fixed before
fuse replacement.
Cleaning the
GDM-8200A series
Disconnect the power cord before cleaning.
Use a soft cloth dampened in a solution of mild
detergent and water. Do not spray any liquid into the
GDM-8200A series.
Do not use chemical or cleaner containing harsh
material such as benzene, toluene, xylene, and acetone.
Operation
Environment
Location: Indoor, no direct sunlight, dust free, almost
non-conductive pollution (Note below)
Relative Humidity: < 75%
Altitude: < 2000m
Temperature: 0°C to 40°C (operation), 18°C to 28°C
(full accuracy)
(Note) EN 61010-1:2001 specifies the pollution degrees and their
requirements as follows. the GDM-8200A series falls under degree
2.
Pollution refers to “addition of foreign matter, solid, liquid, or
gaseous (ionized gases), that may produce a reduction of dielectric
strength or surface resistivity”.
Pollution degree 1: No pollution or only dry, non-conductive pollution
occurs. The pollution has no influence.
Pollution degree 2: Normally only non-conductive pollution occurs.
Occasionally, however, a temporary conductivity caused by
condensation must be expected.
Pollution degree 3: Conductive pollution occurs, or dry,
non-conductive pollution occurs which becomes conductive due to
condensation which is expected. In such conditions, equipment is
normally protected against exposure to direct sunlight, precipitation,
and full wind pressure, but neither temperature nor humidity is
controlled.
Storage
Environment
Location: Indoor
Relative Humidity: < 75% (0~35°C), <50% (35~50°C)
Temperature: −10°C to 70°C
7
GDM-8200A Series User Manual
Green/ Yellow:
Earth
Blue:
Neutral
Brown:
Live (Phase)
Power cord for the United Kingdom
When using the GDM-8200A series in the United Kingdom, make sure the
power cord meets the following safety instructions.
NOTE: This lead / appliance must only be wired by competent persons
WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT: The wires in this lead are coloured in accordance with the
following code:
As the colours of the wires in main leads may not correspond with the
colours marking identified in your plug/appliance, proceed as follows:
The wire which is coloured Green & Yellow must be connected to the Earth
terminal marked with the letter E or by the earth symbol or coloured Green
or Green & Yellow.
The wire which is coloured Blue must be connected to the terminal which is
marked with the letter N or coloured Blue or Black.
The wire which is coloured Brown must be connected to the terminal marked
with the letter L or P or coloured Brown or Red.
If in doubt, consult the instructions provided with the equipment or contact
the supplier.
This cable/appliance should be protected by a suitably rated and approved
HBC mains fuse: refer to the rating information on the equipment and/or
user instructions for details. As a guide, cable of 0.75mm2 should be protected
by a 3A or 5A fuse. Larger conductors would normally require 13A types,
depending on the connection method used.
Any moulded mains connector that requires removal /replacement must be
destroyed by removal of any fuse & fuse carrier and disposed of immediately,
as a plug with bared wires is hazardous if a engaged in live socket. Any
re-wiring must be carried out in accordance with the information detailed on
this label.
8
GETTING STARTED
Characteristics
GDM-8200A Series Lineup ..................................... 10
GDM-8200A Series Characteristics ......................... 11
Panel Overview
Front Panel Overview ............................................. 12
Measurement keys (Upper row) ............................. 13
Measurement keys (Lower row) ............................. 15
Rear Panel Overview .............................................. 17
Setup
Tilt Stand ................................................................ 19
Power Up ................................................................ 20
GETTING STARTED
This chapter describes the GDM-8200A series in a
nutshell, including its main features, package contents,
and front / rear / display panel introduction. After going
through the overview, follow the Power-up sequence and
Functionality check section to properly setup the
GDM-8200A series.
Please note the information in this manual was correct at
the time of printing. However as GWInstek continues to
improve its products, changes can occur at any time
without notice. Please see the GWInstek website for the
latest information and content.
9
GDM-8200A Series User Manual
Appearance
Both two models are identical except for the model name and
the meter count of the 1st display.
Models
GDM-8251A
1st display meter: 120,000 counts
GDM-8255A
1st display meter: 199,999 counts
GDM-8200A Series Lineup
The GDM-8200A series consists of two models:
GDM-8251A and GDM-8255A.
10
GETTING STARTED
Performance
High DCV accuracy: 0.012%
High current range: 10A
High Voltage range: 1000V
High ACV frequency response: 100kHz
Features
120000 meter count (GDM-8251A)
199999 meter count (GDM-8255A)
Multi functions: ACV, DCV, ACI, DCI, 2W/4W R, Hz,
Continuity, Diode test, MAX/MIN, REL, dBm,
HOLD, AutoHold, Compare.
Manual or Auto ranging
AC true RMS or AC + DC true RMS
Interface
Voltage/Resistance/Diode/Temperature input
Current input
4W sense input
USB device/RS232 for remote control
9-pin digital I/O
16 channel scanner x2 (optional)
Optional Items
16 channel scanner x 2
GDM-8200A Series Characteristics
The GDM-8200A series are portable, dual-display digital
multimeters suitable for wide range of applications, such
as production testing, research, and field verification.
11
GDM-8200A Series User Manual
Measurement
keys
Main
Terminal
4W Ohm
Terminal
Fuse
Power Switch
Main
Display
DCI/ACI
Terminal
Output On/
Off key
COM
Terminal
Power Switch
Turns On or Off the main power.
For power up sequence, see page20.
Main Display
Shows measurement results and parameters.
For display configuration details, see page64 (light
setting).
Input fuse / 4W
Ω sense LO
terminal
As a fuse, protects the instrument from
over-current. Rating: T2A, 250V.
For fuse replacement procedure, see
page113.
As a sense terminal, accepts 4W Ω
measurement LO connection. Also
accepts current input less than 2A. For
details, see page30.
4W Ω Sense HI
Terminal
Accepts HI sense line in 4W resistance
measurement. For details, see page30.
Front Panel Overview
12
GETTING STARTED
COM Terminal
Accepts ground (COM) line in all
measurements except the sense line in
4W Resistance (page30).
Voltage/ 2W Ω /
(Diode)
Terminal
Accepts input in all measurements
except for DC/AC Current and 4W
Resistance sense line.
Current Terminal
Accepts DC/AC Current input.
For DCI/ACI details, see page28.
Output On/Off
key
Turns the display on or off. When the
display is turned off, all panel keys
except the Output On/Off key become
disabled. The Output On/Off key is On
by default.
SHIFT/EXIT
As the Shift key, selects the second
functionality assigned to each front
panel key. When pressed, the
indicator appears in the display.
As the Exit key, gets out of the
parameter configuration mode and
goes back to the measurement result
display mode.
ACV
Measures AC Voltage (page24).
SHIFT → ACV
(SCAN)
Starts the optional scan measurement
(page80).
DCV
Measures DC Voltage (page24).
Measurement keys (Upper row)
13
GDM-8200A Series User Manual
SHIFT → DCV
(STEP)
Starts the step measurement (page80)
using the optional scanner.
ACV + DCV
When the ACV key and the DCV key
are pressed together, they measure
AC+DC Voltage (page24).
ACI
Measures AC Current (page28).
SHIFT → ACI
(RECALL)
Recalls a normal measurement result
(page68) or a scan measurement
result (page88).
DCI
Measures DC Current (page28).
SHIFT → DCI
(STORE)
Stores a measurement result
(page67).
ACI + DCI
When the ACI key and the DCI key
are pressed together, they measure
AC+DC Current (page28).
2/4W
(Resistance)
Measures 2-wire or 4-wire Resistance
(page30).
SHIFT → 2/4W
(MATH)
Enters the Math measurement mode
(page52).
(Diode/
Continuity)
Tests Diode (page32) or Continuity
(page33).
SHIFT →
(dBm)
Measures dBm (page43).
Hz/P (Frequency/
Period)
Measures Frequency or Period
(page36).
SHIFT + Hz/P
(dB)
Measures dB (page44).
14
GETTING STARTED
(Temperature)
Measures Temperature (page37).
SHIFT + TEMP
(SENSOR)
Selects the type of thermocouple
used in the Temperature
measurement (page38).
AUTO/ENTER
As the AUTO key, selects the
measurement range automatically.
As the ENTER key, confirms the
entered value.
SHIFT → AUTO
(RATE)
Selects the measurement update rate:
Slow, Medium, or Fast (page22).
Up/Down
Selects the parameter in various
occasions: higher ( ) or lower ( ).
HOLD
Activates the Hold function (page48).
SHIFT → HOLD
(COMPare)
Activates the Compare measurement
(page49).
TRIG (Trigger)
Triggers sample acquisition manually
(page59).
SHIFT → TRIG
(Int/Ext Trigger)
Selects the Internal or the External
trigger source (page59).
Left/Right
Selects the parameter in various
occasions: left ( ) or right ( ).
REL
Measures the Relative value (page46).
SHIFT → REL
(RELative base)
Manually sets the reference value for
the Relative value measurement
(page46).
Measurement keys (Lower row)
15
GDM-8200A Series User Manual
MX/MN
(MAX/ MIN)
Measures the Maximum or the
Minimum value (page45).
SHIFT →
MX/MN (FILTER)
Selects the digital filter type for the
signal sampling (page62).
2ND (Display) /
LOCAL
As the 2nd key, selects the
measurement item on the 2nd display
(page55). Pressing and holding for
more than 1 second turns off the 2nd
display.
As the Local key, releases the remote
control and goes back to the local
panel operation (page96).
SHIFT → 2ND
(Menu)
Enters the configuration mode.
Configures or displays the following
items: Display (page57), Beep
(page35), Continuity threshold
(page34), Scanner (page80), Digital
I/O (page90), and System
information (page110).
16
GETTING STARTED
RS-232C
Port
Optional Item
Slot x2
Power Cord
Socket
Fuse
T3.15A/250V
CAL Key
Port
Digital I/O
Port
USB Device
Port
Power Cord
Socket
Accepts the power cord. AC
100–240V, 50–60Hz.
For power on sequence, see page20.
Fuse Socket
Holds the main fuse: T3.15A 250V,
20VA.
For fuse replacement details, see
page112.
RS-232C port
Accepts an RS-232C cable for remote
control; DB-9 male connector.
For remote control details, see page97.
USB device port
Accepts a USB device cable for remote
control; Type A, female connector.
For remote control details, see page96.
CAL key port
CAL KEY
Reserved for internal uses as in
firmware update and calibration.
Rear Panel Overview
17
GDM-8200A Series User Manual
Digital I/O port
Accepts a digital I/O cable for the
Hi/Lo limit test; DB-9 pin, female
connector.
For digital I/O details, see page91.
Optional slot x2
Accepts up to two optional scanner modules. 16
channels are available per scanner. When two modules
are used, maximum 32 channels are available.
For scanner details, see page71.
18
Set Up
Tilt stand steps
Pull out the
handle sideways
and rotate it.
Place the unit
horizontally,
Or in the tilt
stand position.
Place the handle
vertically for hand
carry.
Tilt Stand
GETTING STARTED
19
Power Up
Power up steps
1. Connect the power
cord to the AC
Voltage input.
Note
Make sure the ground connector of the power cord
is connected to a safety ground. This will affect the
measurement accuracy.
2. Push to turn On the
main power switch on
the front panel.
3. The display shows the model name and the version
for a few seconds.
Example: GDM-8255A, V2.10
4. Followed by the default measurement settings.
5. And the interface I/O settings.
6. Then the default setting appears.
Example: DCV, Auto, 1V range
GDM-8200A Series User Manual
20
BASIC MEASUREMENT
Overview
Basic Measurement Overview ................................ 22
Common attribute: refresh rate .............................. 22
Common attribute: reading indicator ..................... 23
Common attribute: manual/automatic triggering .. 23
Voltage
AC/DC/AC+DC Voltage Measurement .................... 24
Select Voltage range ............................................... 25
Voltage conversion table ........................................ 26
Crest factor table .................................................... 27
Current
AC/DC/AC+DC Current Measurement ................... 28
Select Current range ............................................... 29
Resistance
2W/4W Resistance Measurement ........................... 30
Select Resistance range .......................................... 31
Diode
Diode Test .............................................................. 32
Continuity
Continuity Test ....................................................... 33
Set continuity threshold ......................................... 34
Select beeper setting .............................................. 35
Frequency/
Period
Frequency/Period Measurement ............................ 36
Temperature
Temperature Measurement .................................... 37
Select thermocouple type ....................................... 38
Set reference junction temperature ........................ 39
BASIC MEASUREMENT
21
GDM-8200A Series User Manual
Background
Basic measurement refers to the eight types of
measurements assigned to the upper row keys on the front
panel.
Measurement
type
ACV
AC Voltage
DCV
DC Voltage
ACV+DCV
AC+DC Voltage
ACI
AC Current
DCI
DC Current
ACI+DCI
AC+DC Current
2/4W
2-wire and 4-wire Resistance
Diode/Continuity
Hz/P
Frequency/Period
TEMP
Celsius/Fahrenheit Temperature
Advanced
measurement
Advanced measurement (page40) mainly refers to the
operation using the result obtained from one or more of
the basic measurement.
Background
Refresh rate defines how frequently the GDM-8200A
series captures and updates the measurement data. Faster
refresh rate yields lower accuracy and resolution. Slower
refresh rate yields higher accuracy and resolution.
Consider these trade-offs when selecting the refresh rate.
Range
S
5 ½ digits
M 4 ½ digits
F 3 ½ digits
Selection step
1. Press the Shift key followed by
the AUTO (RATE) key. The
refresh rate switches to the next.
Basic Measurement Overview
Common attribute: refresh rate
22
BASIC MEASUREMENT
2. The refresh rate indicator shows
the current status.
→ → →
Background
The reading indicator next to the 1st display flashes
according to the refresh rate setting.
Automatic
triggering
(default)
The GDM-8200A series triggers according to the refresh
rate. See the previous page for refresh rate setting details.
Manual
triggering
Press the TRIG key to trigger
measurement manually.
Common attribute: reading indicator
Common attribute: manual/automatic triggering
23
GDM-8200A Series User Manual
Voltage type
AC
0 ~ 750V
DC
0 ~ 1000V
AC+DC
0 ~ 1000V
AC2+DC
2
*AC+DC=
(AC = true RMS)
1. Activate ACV/
DCV
Press the ACV (AC Voltage) key or
DCV (DC Voltage) key.
or
For AC+DC Voltage, press the ACV
key and the DCV key together.
2. ACV/DCV
mode display
appears
AC(DC) + V
Indicates AC, DC, AC+DC Voltage
AUTO
Indicates Automatic range selection
100mV
2nd display shows the Voltage range
3. Connect the
test lead and
measure
Connect the test lead between the V
and the COM port. The display
updates the reading.
V
COM
Note
When measuring in1000V (maximum) range immediately
followed by 100mV (minimum) range, an error might
occur due to extreme range switching. In such case, take
at least one minute in between as an interval.
AC/DC/AC+DC Voltage Measurement
24
BASIC MEASUREMENT
Auto range
To turn the automatic range selection
On/Off, press the AUTO key.
Manual range
Press the Up or the Down key to select
the range. AUTO indicator turns Off
automatically. If the appropriate range
is unknown, select the highest range.
Selection list
Range
Resolution / Full scale @ slow rate
Resolution
Full scale
(GDM-8251A)
Full scale
(GDM-8255A)
100mV
1µV
120.000mV
199.999mV
1V
10µV
1.20000V
1.99999V
10V
100µV
12.0000V
19.9999V
100V
1mV
120.000V
199.999V
750V (AC)
10mV
750.00V
750.00V
1000V
(DC, AC+DC)
10mV
1000.0V
1000.0V
Note
For more detailed parameters, see the specifications at
page114.
Select Voltage range
25
GDM-8200A Series User Manual
Waveform
Peak to Peak
AC
(True RMS)
DC
AC + DC
(True RMS)
Sine
PK-PK
2.828
1.000
0.000
1.000
Rectified Sine
(full wave)
PK-PK
1.414
0.435
0.900
1.000
Rectified Sine
(half wave)
PK-PK
2.000
0.771
0.636
1.000
Square
PK-PK
2.000
1.000
0.000
1.000
Rectified
Square
PK-PK
1.414
0.707
0.707
1.000
Rectangular
Pulse
PK-PK
X
Y
2.000
2K
K=
)2
( DD
D=X/Y
2D
D=X/Y
2
D
D=X/Y
Triangle
Sawtooth
PK-PK
3.464
1.000
0.000
1.000
Voltage conversion table
This table shows the relationship between AC, DC, and AC+DC reading in
various waveforms.
26
BASIC MEASUREMENT
Background
Crest factor is the ratio of the peak signal amplitude to the
RMS value of the signal. It determines the accuracy of AC
measurement.
If the crest factor is less than 3.0, voltage measurement will
not result in error due to dynamic range limitations at full
scale.
If the crest factor is more than 3.0, it usually indicates
abnormal waveform as seen from the below table.
Waveform
Shape
Crest factor
Square wave 1.0
Sine wave 1.414
Triangle
sawtooth
1.732
Mixed
frequencies
1.414 ~ 2.0
SCR output
100% ~ 10%
1.414 ~ 3.0
White noise
3.0 ~ 4.0
AC Coupled
pulse train
3.0
Spike
>9.0
Crest factor table
27
GDM-8200A Series User Manual
Current type
AC
0 ~ 10A
DC
0 ~ 10A
AC+DC
0 ~ 10A
AC2+DC
2
*AC+DC=
(AC = true RMS)
1. Activate ACI/
DCI
Press the ACI (AC Current) key or
the DCI (DC Current) key.
or
For AC+DC Current, press the ACI
key and the DCI key together.
2. ACI/DCI mode
display appears
AC(DC) + A
Indicates AC, DC, AC+DC Current
(Note: AC = true RMS)
AUTO
Indicates Automatic range selection
10A
2nd display shows the Current range
3. Connect the
test lead and
measure
Connect the test lead
between the A and COM
port or LO to COM port,
depending on the current.
For current ≤ 2A* use the
LO port; For current up to
10A use the A port. The
display updates the reading.
*2A (GDM-8255A, 1.2A
GDM-8251A)
A
COM
LO
MAX
2A
AC/DC/AC+DC Current Measurement
28
BASIC MEASUREMENT
Auto range
To turn the automatic range selection
On/Off, press the AUTO key.
Manual range
Press the Up or the Down key to select
the range. AUTO indicator turns Off
automatically. If the appropriate range
is unknown, select the highest range.
Selection list
Range
Resolution / Full scale @ slow rate
Resolution
Full scale
(GDM-8251A)
Full scale
(GDM-8255A)
10mA
0.1µA
12.0000mA
19.9999mA
100mA
1µA
120.000mA
199.999mA
1A
100µA
1.2000A
1.9999A
10A
100µA
10.0000A
10.0000A
Note
*10A range is not available for AC+DC Current.
For more detailed range, see the specifications at page116.
Select Current range
29
GDM-8200A Series User Manual
Measurement
type
2-wire
Uses the standard V-COM ports.
Recommended for measuring resistances
larger than 1kΩ.
4-wire
Compensates the test lead effect using the
4W compensation ports, in addition to the
standard V-COM ports.
Recommended for measuring sensitive
resistances smaller than 1kΩ.
1. Activate
resistance
measurement
For 2-wire resistance measurement,
press the 2W/4W key once.
For 4-wire resistance measurement,
press the 2W/4W key twice.
2. 2W resistance
mode display
appears
2W(4W) + Ω
Indicates 2W(4W) Resistance mode
AUTO
Indicates Automatic range selection
10M
2nd display shows the Resistance range
3. Connect the
test lead and
measure
Connect the test lead. For 2-wire resistance, use the Ω (V)
and the COM port. For 4-wire resistance, use the Ω (V)
and the COM port, plus the 4W sense, and LO port for
sensing. The display updates the reading.
2W connection
COM
4W connection
COM
4W
SENSE
LO
2W/4W Resistance Measurement
30
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