GW Instek GDM-8261 User manual

Dual Measurement Multimeter
GDM-8261
USER MANUAL
GW INSTEK PART NO. 82DM-82610EA1
ISO-9001 CERTIFIED MANUFACTURER
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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 (R.O.C.).
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Table of Contents
3
Table of Contents
SAFETY INSTRUCTIONS ....................................................6
Safety Symbols....................................................6
Safety Guidelines ................................................7
GETTING STARTED..........................................................10
GDM-8261 Characteristics ................................ 11
Front Panel Overview ........................................ 12
Rear Panel Overview ......................................... 17
Set Up ............................................................... 19
BASIC MEASUREMENT....................................................22
Basic Measurement Overview........................... 24
AC/DC Voltage Measurement ........................... 26
AC/DC Current Measurement ........................... 30
2W/4W Resistance Measurement ..................... 32
Diode Test ......................................................... 34
Continuity Test .................................................. 35
Frequency/Period Measurement ....................... 38
Temperature Measurement ............................... 40
DUAL MEASUREMENT ....................................................46
Dual Measurement ........................................... 46
ADVANCED MEASUREMENT ...........................................52
Advanced Measurement Overview .................... 53
dBm/dB Measurement...................................... 55
Max/Min Measurement..................................... 57
Relative Value Measurement............................. 58
Hold Measurement ........................................... 60
Compare Measurement..................................... 61
Math Measurement........................................... 64
SYSTEM/DISPLAY CONFIGURATION ..............................70
Refresh Rate Setting.......................................... 71
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GDM-8261 User Manual
4
View Serial Number...........................................71
Trigger Setting...................................................72
Digital Filter Setting..........................................75
Display Setting ..................................................77
Measurement Configuration Settings ...............78
ADC Setting.......................................................83
Frequency / Period Settings ..............................87
STORE/RECALL ............................................................... 90
Store Measurement Record...............................91
Recall Measurement Record..............................92
Save Instrument Settings ..................................93
Recall Instrument Settings................................94
SCANNER (OPTIONAL) .................................................. 96
GDM-SC1 Scanner Specifications .....................97
Scanner Installation ..........................................97
Setup Scan ...................................................... 104
Run Scan ......................................................... 111
DIGITAL I/O ...................................................................114
Digital I/O Terminal Configuration ................. 115
REMOTE CONTROL .......................................................121
Configure Interface.......................................... 122
Command Syntax ............................................ 132
Command Set.................................................. 133
FAQ ................................................................................176
APPENDIX ......................................................................177
Firmware Version ............................................ 178
Fuse Replacement ........................................... 179
Menu Tree ....................................................... 181
Specifications .................................................. 183
EC Declaration of Conformity.......................... 192
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Table of Contents
5
INDEX ............................................................................193
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GDM-8261 User Manual
6
SAFETY INSTRUCTIONS
This chapter contains important safety instructions that
you must follow when operating the GDM-8261 and
when keeping it in storage. Read the following before any
operation to insure your safety and to keep the
GDM-8261 in the best possible condition.
Safety Symbols
These safety symbols may appear in this manual or on the GDM-8261.
WARNING
W
arning: 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-8261 or to other property.
DANGER High Voltage
A
ttention Refer to the Manual
Protective Conductor Terminal
Earth (ground) Terminal
Do not dispose electronic equipment as unsorted
municipal waste. Please use a separate collection facility
or contact the supplier from which this instrument was
purchased.
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SAFETY INSTRUCTIONS
7
Safety Guidelines
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-8261.
Avoid severe impact or rough handling that can lead to
damaging the GDM-8261.
Do not discharge static electricity to the GDM-8261.
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 a
low-voltage installation or at building installations
(Note below).
Do not disassemble the GDM-8261 unless you are
qualified as service personnel.
(Note) EN 61010-1:2001 specifies the measurement categories and
their requirements as follows. The GDM-8261 falls 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: 100/120/220/240 V AC ±10%,
45Hz to 66Hz / 360Hz to 440Hz
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.
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GDM-8261 User Manual
8
Fuse
WARNING
Fuse type: 0.315AT 100/120VAC
0.125AT 220/240 VAC
Make sure the correct type of fuse is installed before
power up.
To avoid risk of fire, replace the fuse only with the
specified type and rating.
Disconnect the power cord before fuse replacement.
Make sure the cause of a fuse blowout is fixed before
fuse replacement.
Cleaning the
GDM-8261
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-8261.
Do not use chemicals or cleaners 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)
Temperature: Full accuracy for 0°C to 55°C.
Humidity: Full accuracy to 80% RH at 40°C
(Note) EN 61010-1:2001 specifies the pollution degrees and their
requirements as follows. The GDM-8261 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
Temperature: 40°C to 70°C
Disposal
Do not dispose this instrument as unsorted municipal
w
aste. Please use a separate collection facility or contact
the supplier from which this instrument was purchased.
Please make sure discarded electrical waste is properly
recycled to reduce environmental impact.
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SAFETY INSTRUCTIONS
9
Power cord for the United Kingdom
When using the GDM-8261 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:
Green/ Yellow: Earth
Blue: Neutral
Brown: Live (Phase)
As the colours of the wires in main leads may not correspond with the
coloured 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 either the letter E, the earth symbol or coloured
Green/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, a cable of 0.75mm2should be
protected by a 3A or 5A fuse. Larger conductors would normally require 13A
types, depending on the connection method used.
Any exposed wiring from a cable, plug or connection that is engaged in a live
socket is extremely hazardous. If a cable or plug is deemed hazardous, turn
off the mains power and remove the cable, any fuses and fuse assemblies. All
hazardous wiring must be immediately destroyed and replaced in accordance
to the above standard.
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GDM-8261 User Manual
10
GETTING STARTED
This chapter describes the GDM-8261 in a nutshell,
including an Overview of its main features and front /
rear panel introduction. After going through the
Overview, follow the Power-up sequence to properly
setup the GDM-8261.
Please note the information in this manual was correct at
the time of printing. However as GW Instek continues
to improve its products, changes can occur at any time
without notice. Please see the GW Instek website for the
latest information and content.
Characteristics GDM-8261 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
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GETTING STARTED
11
GDM-8261 Characteristics
The GDM-8261 is a portable, dual-display digital
multimeter suitable for a wide range of applications, such
as production testing, research, and field verification.
Performance High DCV accuracy: 0.0035%
High current range: 10A
High Voltage range: 1000V
High ACV frequency response: 300kHz
Features 62
1digits
Multi functions: ACV, DCV, ACI, DCI, 2W/4W R, Hz,
Temp, Continuity, Diode test, MAX/MIN, REL, dBm,
Hold, AutoHold, Compare, Statistics.
Manual or Auto ranging
AC true RMS
Interface Voltage/Resistance/Diode/Temperature input
Current input
4W sense input
USB device/RS232/GPIB(optional)/LAN(optional)
for remote control
9-pin digital I/O
16 channel scanner (optional)
Optional Items 16 channel scanner
GPIB port
Ethernet port
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GDM-8261 User Manual
12
Front Panel Overview
Measurement
Keys
Input Hi
Terminal
Sense Hi
Terminal
Sense Lo,
DC/AC 1A Terminal
Power Switch
Main
Display
DC/AC 10A
Terminal
Input Lo
Terminal
AMPS Fuse
Holder
Main Display
Output On/Off Key
Power Switch POWER
Turns On or Off the main
power. For the power up sequence, see
page 20.
Main Display Shows measurement results and parameters.
For display configuration details, see page 77 (light
setting).
Sense Lo
DC/AC 1A
Terminal
AMPS Fuse
Holder
FUSE
T1.25A
250V
A
s a fuse, protects the instrument from
over-current. Rating: T1.25A, 250V.
For the fuse replacement procedure, see
page 180.
A
s a sense terminal, accepts 4W 
measurement LO connection. For
details, see page 32
A
lso accepts current input
DC: 100A~1A
A
C:1mA~1A
For details see page 30.
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GETTING STARTED
13
Sense HI
Terminal
A
ccepts HI sense line in 4W resistance
measurement. For details, see page 32.
Input Lo Terminal
A
ccepts ground (COM) line in all
measurements except the sense line in
4W Resistance (page 32).
Input Hi Terminal
Used as an input port for all
measurements except for DC/AC
Current measurements.
DC/AC 10A
Terminal
A
ccepts DC/AC Current input.
For DCI or ACI details, see page 30.
Main Display
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.
Measurement Keys (upper row)
SHIFT/EXIT / EXITSHIFT
The Shift key is used to select the
secondary functions assigned to
each front panel key. When pressed,
the SHIFT indicator appears in the
display.
A
s the Exit key, it gets out of the
parameter configuration mode and
goes back to the measurement result
display mode.
ACV
Measures AC Voltage (page 26).
SHIFT →ACV
(SCAN) ACV
SCAN
Starts the optional scan
measurement (page 104).
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GDM-8261 User Manual
14
DCV
Measures DC Voltage (page 26).
SHIFT →DCV
(STEP) DCV
STEP
Starts the step measurement (page
104) using the optional scanner.
ACI
Measures AC Current (page 30).
SHIFT →ACI
(RECALL) ACI
RECALL
Recalls a normal measurement
result, standard deviation
measurement readings (page 92) or
scan measurement results (page
112).
DCI
Measures DC Current (page 30).
SHIFT →DCI
(STORE) DCI
STORE
Stores a measurement result (page
91).
2/4W
(Resistance) Measures 2-wire or 4-wire
Resistance (page 32).
SHIFT →2/4W
(MATH) 2/4W
MATH
Enters the Math measurement mode
(page 64).
(Diode/
Continuity) Tests Diode (page 34) or Continuity
(page 35).
SHIFT →
(dBm) /
dBm
Measures dBm (page 55).
Hz/P (Frequency/
Period) Measures Frequency or Period (page
38).
SHIFT + Hz/P
(dB) Hz/P
dB
Measures dB (page 56).
TEMP
(Temperature) Measures Temperature (page 40).
SHIFT + TEMP
(SENSOR)
Selects the type of thermocouple
used in the Temperature
measurement (page 41).
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GETTING STARTED
15
Measurement Keys (lower row)
AUTO/ENTER
A
s the AUTO key, selects the
measurement range automatically.
A
s the Enter key, confirms the
entered value.
SHIFT →AUTO
(RATE) / EXITSHIFT
Selects the measurement update
rate: Slow, Medium, or Fast (page
24).
Up/Down
Selects the parameter in various
occasions: higher ( ) or lower
().
HOLD
A
ctivates the Hold function (page
60).
SHIFT →HOLD
(COMPare)
/ EXITSHIFT
HOLD
COMP
A
ctivates the Compare
measurement (page 61).
TRIG (Trigger) Triggers sample acquisition
manually (page 72).
SHIFT →TRIG
(Int/Ext Trigger)
/ EXITSHIFT
TRIG
INT/EXT
Selects the Internal or the External
trigger source (page 72).
Left/Right
Selects parameters in various menus:
left ( ) or right ( ).
REL Measures the Relative value (page
58).
SHIFT →REL
(RELative base)
/ EXITSHIFT
REL
REL#
Manually sets the reference value for
the Relative value measurement
(page 58).
MX/MN
(MAX/ MIN) Measures the Maximum or the
Minimum value (page 57).
SHIFT →MX/MN
(FILTER)
/ EXITSHIFT
MX/MN
FILTER
Selects the digital filter type for the
signal sampling (page 75).
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GDM-8261 User Manual
16
2nd (Display) /
LOCAL
A
s the 2nd key, selects the
measurement item on the 2nd
display (page 46). Pressing and
holding for more than 1 second
turns off the 2nd display.
A
s the Local key, releases the remote
control and returns the instrument
to local panel operation (page 122).
SHIFT → 2nd
(Menu)
Enters the configuration mode for;
System Settings, Measurement
Settings, ADC Settings,
Frequency/Period Settings, I/O
Settings, TX TERM Settings and
Scanner Settings.
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GETTING STARTED
17
Rear Panel Overview
Power Cord
Socket
100
220
120
240
A
ccepts the power cord. AC
100/120/220/240V ±10%,
45Hz~66Hz, 360Hz~440Hz.
For power on sequence, see page 20.
Fuse Socket
100
220
120
240
Holds the main fuse:
100/120 VAC: 0.315AT
220/240 VAC: 0.125AT
For fuse replacement details, see page
179.
RS-232C port
A
ccepts an RS-232C cable for remote
control; DB-9 male connector.
For remote control details, see page
127.
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GDM-8261 User Manual
18
USB device port
A
ccepts a USB device cable for remote
control; Type A, female connector.
For remote control details, see page
122.
CAL key port
Reserved for internal purposes such as
firmware updates and calibration.
Digital I/O port
A
ccepts a digital I/O cable for the
Hi/Lo limit tests; DB-9 pin, female
connector.
For digital I/O details, see page 115.
Optional slot x1
A
ccepts the optional 16 channel scanner module. For
scanner details, see page 96.
Optional
Communication
port
A
ccepts an optional GPIB or Ethernet
card.
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GETTING STARTED
19
Set Up
Tilt Stand
Tilt stand steps Pull out the
handle sideways
and rotate it.
Place the unit
horizontally,
Or in the tilt
stand position.
Place the handle
v
ertically for hand
carry.
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GDM-8261 User Manual
20
Power Up
Steps 1. Ensure the correct line voltage is
lined up with the arrow on the fuse
holder. If not, see page 179 to set the
line voltage and fuse.
100
220
120
240
2. Connect the power
cord to the AC
Voltage input.
Note
Make sure the ground connector on the power
cord is connected to a safety ground. This will
affect the measurement accuracy.
3. Push to turn on the
main power switch on
the front panel.










4. The display shows the model name and the version
for a few seconds.
Example: GDM-8261, V1.00
5. Followed by the default measurement settings.
6. And the interface I/O settings.
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