GW Instek GDM-8245 User manual

Digital Multimeter
GDM-8245
Service MANUAL
GW INSTEK PART NO. 82DM-82450S01
ISO-9001 CERTIFIED MANUFACTURER

June 2011
This manual contains proprietary information which is protected by copyright. All rights are reserved.
No part of this manual may be photocopied, reproduced or translated without the prior written
consent of Good Will Corporation.
The information in this manual was correct at the time of printing. However, Good Will continues to
improve its products and therefore reserves the right to change the 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
3
Table of Contents
Safety Requirements ...........................................6
Safety Symbols and Terms ......................................................... 6
Precautions Before Use .............................................................. 7
Declaration of Conformity ........................................................ 10
Introduction .....................................................11
Features ................................................................................. 11
Package Contents .................................................................... 11
Standard items......................................................................... 11
Specifications ......................................................................... 12
DC Voltage............................................................................... 12
TRUE RMS AC, AC+DC VOLTAGE .............................................. 13
Frequency measurement at ACV range..................................... 14
DC Current............................................................................... 14
TRUE RMS AC OR AC+DC CURRENT ......................................... 14
FREQUENCY MEASUREMENT AT ACA RANGE............................. 15
Resistance................................................................................ 15
Capacitance ............................................................................. 15
Diode check ............................................................................. 16
Continuity Beeper..................................................................... 16
Environmental .......................................................................... 16
General .................................................................................... 16
Input overload protection......................................................... 17
Front/Rear Panel ..................................................................... 18
Calibration Log.................................................19
Verification Log ................................................23
Block Diagram ..................................................31
Trouble Shooting ..............................................39
Power-On Test ......................................................................... 40
Power Supply Checks ............................................................... 40
Display Board Checks............................................................... 41
Digital Circuitry Checks............................................................ 42

GDM-8245 Service Manual
4
Key Matrix Checks.................................................................... 43
Digital Circuitry Checks............................................................ 43
Calibration .......................................................49
Preparation ............................................................................ 50
List of Equipment ................................................................... 51
Component Position (Servicing)................................................ 52
Entering the Calibration mode ................................................. 53
Voltage Verification ................................................................ 54
LED Verification ...................................................................... 55
Power Supply Current Verification ............................................ 55
ACV, ACA, DCA, ΩShort Calibration......................................... 56
Frequency Response Calibration .............................................. 56
Frequency Response Adjustment .............................................. 58
Capacitance Calibration (Open) ................................................ 60
Resistance Calibration ............................................................. 60
DCV Calibration ...................................................................... 61
Diode Calibration.................................................................... 63
DCA Calibration ...................................................................... 64
ACA Calibration ...................................................................... 65
Capacitance Calibration........................................................... 66
Exit Calibration Mode .............................................................. 67
Verification ......................................................68
Resistance Verification (Short) ................................................. 69
Resistance Verification ............................................................ 69
Diode Verification ................................................................... 70
Capacitance Verification (Open) ............................................... 70
Capacitance Verification .......................................................... 71
DCA Verification (Short) .......................................................... 71
DCA Verification ..................................................................... 72
ACA Verification ..................................................................... 73
ACV Verification (Short) ........................................................... 74
ACV Verification (Part 1) .......................................................... 74
AC+DC Verification ................................................................. 75
ACV Verification (Part 2) .......................................................... 75
DCV Verification (Short) .......................................................... 76
DCV Verification (Part 1).......................................................... 76
DCV Verification (dBm) ............................................................ 77
DCV Verification (Part 2).......................................................... 77

Table of Contents
5
Beeper Test............................................................................. 78
Frequency Measurement Verification ........................................ 78
Changing the AC Mains / Fuse...........................80
REPLACE INPUT CURRENT FUSE.......................................................... 82
Replaceable Parts and Disassembly ....................83
External View .......................................................................... 84
Disassembly ........................................................................... 85
Disassembly Equipment ........................................................... 85
Outer Casing............................................................................ 86
Main PCB and Front/Rear/Bottom Panel Removal ..................... 87
Front Panel PCB Removal.......................................................... 88
GDM-8245 Mechanical Parts List .............................................. 89
Front Panel............................................................................... 89
Top and Bottom Case............................................................... 90
PCB Parts.................................................................................. 90
Rear Panel and Handle ............................................................. 91
Others...................................................................................... 91
Circuit Diagrams and Component Parts List ........92
Circuit Diagram 1 (GDM-8245) ................................................. 93
Circuit Diagram 2 (GDM-8245) ................................................. 94
Circuit Diagram 3 (GDM-8245) ................................................. 95
Circuit Layout (GDM-8245) ...................................................... 96
GDM-8245 Component Parts List ............................................. 97

GDM-8245 Service Manual
6
SAFETY REQUIREMENTS
This chapter contains important safety instructions which
should be followed when operating the instrument and
keeping it in storage. Read the following before operating
this instrument to ensure safety and to keep the instrument
in best condition.
Safety Symbols and Terms
These safety symbols may appear in this manual or on the instrument.
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 instrument or to other objects.
DANGER High Voltage
Attention: 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.

Safety Requirements
7
Precautions Before Use
General guidelines
CAUTION
Make sure that the voltage input level does not exceed
DC1200V/AC1000V. (Limitations apply, please see
the specifications)
Make sure the current input level does not exceed
20A.
Do not place any heavy objects on the GDM-8245.
Avoid severe impact or rough handling that leads to
damaging the GDM-8245.
Do not discharge static electricity to the GDM-8245.
Use only mating connectors, not bare wires, for the
terminals.
Do not perform measurement at the source of a
low-voltage installation or at building installations
(Note below).
Do not disassemble the GDM-8245 unless you are
qualified as service personnel.
(Note) EN 61010-1:2001 specifies the measurement categories and their
requirements as follows. This instrument falls under category II and III. (1200V
CAT II, 600V CAT III)
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: 100V/ 120V/ 230 V AC, 50/60Hz
The power supply voltage should not fluctuate more
than 15%.
Connect the protective grounding conductor of the
AC power cord to an earth ground, to avoid electrical
shock.
Fuse
WARNING
Fuse type:
100V/120V
T0.1A 250V
230V
T0.08A 250V
Make sure the correct type of fuse is installed before
power up.
To avoid fire, only replace the fuse 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.

GDM-8245 Service Manual
8
Cleaning the
instrument
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-8245.
Do not use chemicals or cleaners containing harsh
material such as benzene, toluene, xylene, and
acetone.
Operating
environment
Location: Indoor, no direct sunlight, dust free, almost
non-conductive pollution (Note below)
Relative Humidity: < 75%
Altitude: < 2000m
Temperature: 0°C to 50°C (operation)
(Note) EN 61010-1:2001 specifies the pollution degrees and their
requirements as follows. The GDM-8245 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: −40°C to 70°C
*Excluding 2M/20MΩ ranges
Disposal
Do not dispose this instrument as unsorted municipal
waste. 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.

Safety Requirements
9
Power cord for the United Kingdom
When using the instrument 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 mains leads may not correspond with the
coloured markings 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 0.75mm2should 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 engaged in a live socket. Any re-wiring
must be carried out in accordance with the information detailed on this label.

GDM-8245 Service Manual
10
Declaration of Conformity
We
GOOD WILL INSTRUMENT CO., LTD.
(1) No.7-1, Jhongsing Rd., Tucheng Dist., New Taipei City, Taiwan
(2) No. 69, Lu San Road, Suzhou City (Xin Qu), Jiangsu Sheng, China
declare, that the below mentioned product
Type of Product: Dual Display Digital Multimeter
Model Number: GDM-8245
are herewith confirmed to comply with the requirements set out in the Council Directive on the
Approximation of the Law of Member States relating to Electromagnetic Compatibility
(2004/108/EC) and Low Voltage Directive (2006/95/EC).
For the evaluation regarding the Electromagnetic Compatibility and Low Voltage Directive, the
following standards were applied:
◎EMC
Electrical equipment for measurement, control and laboratory use–– EMC requirements
(2004/108/EC)
Harmonized Standard
EN 61326-1:2006
EN 61326-2-1:2006
Conducted & Radiated Emission
CISPR11: 2003+A1:2004+A2:2006
Electrostatic Discharge
IEC 61000-4-2: 2001
Current Harmonics
EN 61000-3-2: 2006
Radiated Immunity
IEC 61000-4-3: 2006 + A1: 2007
Voltage Fluctuations
EN 61000-3-3: 1995+A1: 2001 +A2:
2005
Electrical Fast Transients
IEC 61000-4-4: 2004+Corr.1: 2006 +Corr.2: 2007
-------------------------
Surge Immunity
IEC 61000-4-5: 2005
-------------------------
Conducted Susceptibility
IEC 61000-4-6: 2003+A1: 2004 +A2 :2006
-------------------------
Power Frequency Magnetic Field
IEC 61000-4-8: 1993 + A1: 2000
IEC 61000-4-11: 2004
◎ Safety
Low Voltage Equipment Directive 73/23/EEC & amended by 93/68/EEC
EN 61010-1 : 2001
IEC 61010-1: 2001

Introduction
11
INTRODUCTION
The GDM-8245 is a portable, dual-display digital multimeter suitable for a wide
range of applications, such as production testing, research, and field verification.
Features
Performance
High DCV accuracy: 0.03%+4
High current range: 20A
High Voltage range: 1000V
Features
50000 count display
Multiple functions: ACV, DCV, ACA, DCA, R, C, Hz,
Continuity Beeper, Diode test, MAX/MIN, REL, dBm
and HOLD.
Manual or Auto ranging
AC true RMS or AC + DC true RMS
Package Contents
Below is the list of standard components and optional accessories for the
GDM-8245, besides the main unit.
Standard items
Item
Description
Order information
Test lead x1
GTL-117
Power cord x1
Region dependant
See your distributor
User manual CDx1
Region dependant
See your distributor
Quick User Guide
x1
Region dependant
Others
Calibration
Certificate x1
Certificate of traceable calibration

GDM-8245 Service Manual
12
Specifications
The following specifications apply when the instrument is powered on for at
least 30 minutes within +18°C to +28°C (64.4 to 82.4°F). Accuracy is expressed as
±(percentage of reading + digits), the AC specification is based on a 50% duty
cycle, the power cord protective grounding conductor must be connected to
ground, relative humidity not exceeding 75% and a 1-year calibration cycle.
DC Voltage
RANGE
RRSOLUTION
ACCURACY
INPUT IMPEDANCE
500mV
10uV
0.03%+4
10MΩ
5V
100uV
0.03%+4
11.1 MΩ
50V
1mV
0.03%+4
10.1MΩ
500V
10mV
0.03%+4
10MΩ
1000V
100mV
0.03%+9
10MΩ
Input Impedance
Approx. 10MΩin parallel with < 100pF, all
ranges.
Normal Mode Rejection Ratio
>60dB at 60Hz or 50Hz
Common Mode Rejection Ratio
>90dB at 60Hz or 50Hz
Common Mode Voltage (Max.)
500V DC or peak AC.
Maximum Input
450V DC or peak AC continuous on 500mV
range.
1000V DC or peak AC continuous on other
ranges.
dBM (ref 600Ω)
63.8dBm ~ -97.7dBm.
When the input exceeds the full scale of the selected range, the display will
indicate over-range: ―—OL—―.

Introduction
13
TRUE RMS AC, AC+DC VOLTAGE
Accuracy
Between 2% of range and full range.
Range
20Hz-
45Hz
45Hz-
1kHz
1kHz-
2kHz
500mV
1%+15
0.5%+15
0.5%+15
5V
1%+15
0.5%+15
0.5%+15
50V
1%+15
0.5%+15
0.5%+15
500V
1%+15
0.5%+15
--------
1000V
1%+15
0.5%+15
--------
Range
2kHz-
10kHz
10kHz-
20kHz
20kHz-
50kHz
500mV
1%+15
2%+30
5%+30
5V
1%+15
2%+30
5%+30
50V
1%+15
2%+30
5%+30
500V
--------
--------
--------
1000V
--------
--------
--------
500mV
10uV
10MΩ
5V
100uV
11.1 MΩ
50V
1mV
10.1MΩ
500V
10mV
10MΩ
1000V
100mV
10MΩ
Input Impedance
Approx. 10MΩin parallel with < 100pF, all ranges.
Maximum Input
450V dc or peak ac continuous on 500mV range.
1000Vrms on other range.
Crest Factor Range
3.0 at full scale.
dBm (ref 600Ω)
63.8dBm ~ -97.7dBm.
When the input exceeds the full scale of the selected range, the display will
indicate over-range: ―—OL—―.

GDM-8245 Service Manual
14
Frequency measurement at ACV range
RANGE
FREQUENCY
INPUT LEVEL (SINE
WAVE)
ACCURACY
500mV
10Hz ~ 50kHz
≥120mV
0.05%+1
50kHz ~ 150kHz
≥200mV
0.05%+1
5V
10Hz ~ 200kHz
≥1.2V
0.05%+1
50V
20Hz ~ 200kHz
≥1.2V
0.05%+1
500V
20Hz ~ 1kHz
≥12V
0.05%+1
AC+DC measurement does not support AC+Hz function.
Maximum Input
450V peak ac continuous on 500mV range.
500V peak ac continuous on the other ranges.
DC Current
RANGE
RESOLUTION
ACCURACY
BURDEN VOLTAGE
500uA
0.01uA
0.2% +2
0.7Vmax.
5mA
0.1uA
0.2% +2
0.7Vmax.
50mA
1uA
0.2% +2
0.7Vmax.
500mA
10uA
0.2% +2
0.8Vmax.
2A
100uA
0.3% +2
0.8Vmax.
20A
1mA
0.3% +2
0.9Vmax.
Protection
Fuse protection for 500uA, 5mA, 50mA, 500mA and 2A
ranges. To obtain accurate measurement results, please
refrain from using the 20A terminal for more than 15
seconds when measuring high current.
When the input exceeds the full scale of the selected range, the display will
indicate over-range: ―—OL—―.
TRUE RMS AC OR AC+DC CURRENT
Accuracy
Between 2% of range and full range.
RANGE
20Hz-45Hz
45Hz-2kHz
2kHz-10kHz
10kHz-20kHz
500uA
1%+15
0.5%+15
1%+15
2%+15
5mA
1%+15
0.5%+15
1%+15
2%+15
50mA
1%+15
0.5%+15
1%+15
2%+15
500mA
1%+15
0.5%+15
—————————
2A
1%+15
0.5%+15
—————————
20A
1%+15
0.5%+15
—————————
Protection
Fuse protection 500uA, 5mA, 50mA, 500mA, and 2A
ranges. To obtain accurate measurement results, please

Introduction
15
refrain from using the 20A terminal for more than 15
seconds when measuring high current.
Crest Factor Range
3.0 at full scale.
The burden voltage is the same as the DC current.
When the input exceeds the full scale of the selected range, the display will
indicate over-range: ―—OL—―.
FREQUENCY MEASUREMENT AT ACA RANGE
RANGE
FREQUENCY
INPUT LEVEL (SINE
WAVE)
ACCURACY
500uA
10Hz ~ 20kHz
≥90μA
0.05%+1
5mA
10Hz ~ 20kHz
≥0.9mA
0.05%+1
50mA
10Hz ~ 20kHz
≥9mA
0.05%+1
500mA
10Hz ~ 20kHz
≥90mA
0.05%+1
2A
10Hz ~ 2kHz
≥1A
0.05%+1
20A
10Hz ~ 2kHz
≥9A
0.05%+1
AC+DC measurement does not support AC+Hz function.
Resistance
RANGE
RESOLUTION
ACCURACY
500Ω
0.01Ω
0.1%+4
5kΩ
0.1Ω
0.1%+2
50kΩ
1Ω
0.1%+2
500kΩ
10Ω
0.1%+2
5MΩ
100Ω
0.2%+2
20MΩ
1kΩ
0.3%+2
Open-circuit Voltage
3.2 volts maximum on 500Ω, 1.3 volts maximum on all
other ranges.
Protection
450V dc or peak ac continuous.
Capacitance
RANGE
RESOLUTION
ACCURACY
5nF *
0.001nF
≥1nF: 2%+10
<1nF & ≥0.5nF: 2%+20
50nF
0.01nF
≥10nF: 2%+10
<10nF & ≥5nF: 2%+30
500nF
0.1nF
2%+4
5uF
1nF
2%+4

GDM-8245 Service Manual
16
50uF
10nF
2%+4
*5nF range is affected by the impedance of the test lead. For accuracy, please
measure the range directly on the input terminal.
Protection
450V dc or peak ac continuous.
Diode check
Description
Display read forward voltage of diode.
Open Voltage
3.1V approx.
Maximum Forward
Voltage
1.5V
Protection
450V dc or peak ac continuous.
Continuity Beeper
Description
Built in buzzer sounds when resistance is less than 5
ohm.
Open Voltage
3 volts maximum.
Protection
450V dc or peak ac continuous.
Environmental
Operation
Environment
Indoor use, altitude up to 2000m.
Ambient Temperature 0˚C to 50˚C.
Relative Humidity 75% (Maximum).
Installation category II
Pollution Degree 2
Storage temperature
-40˚C to 70˚C.
Relative Humidity
< 75%, 0~35˚C
< 50%, 35~50˚C (excluding 2MΩand 20MΩranges).
General
Maximum Common
Mode Voltage
500V dc or peak ac (low terminal potential with respect
to power line ground).
Warm Up
0.5 hours to achieve rated accuracy.
Power source
AC 100V/120V/230V±15%, 50/60Hz, 8VA, 6W.

Introduction
17
Accessories
Test Lead × 1
Quick Guide manual × 1
Dimension
251(W)×91(H)×291(D) mm
Weight
Approx. 2.6 kg
Input overload protection
FUNCTION
RANGE
MAXIMUN INPUT
DCV
5V~1000V
1000Vdc or peak AC
ACV (AC+DC)
5V~1000V
1000V rms continuous &
107V•Hz maximum
DCA,ACA(AC+DC)
500uA~2A
fuse protected: T2A 250V
DC,AC20A(AC+DC)
20A
not fuse protected
DC, ACmV (AC+DC)
500mV
450V dc or AC peak
OHM
all ranges
450V dc or AC peak
CAPACITANCE
all ranges
450V dc or AC peak

GDM-8245 Service Manual
18
Front/Rear Panel
Secondary display Primary display DC/AC input terminal
(≤2A)
DC/AC input terminal
(≤20A)
COM
terminal
FusePower switch Measurement
keys
Main Input
GDM-8245 Dual Display Digital Multimeter
AC1000V
DC1200V
MAX
20A
MAX
VW
2A
MAX
600V CAT
1200V CAT
500V
T2A
250V
FUSE
MAX
M V
mW
mF
k A
n
SHIFT
CAL
REL
AUTO/MAN
SHIFT
REL
MAX/MIN
HOLD
ACDC
kHz
Hz
MIN
AC mV
AUTO
dBm
ACV
AC 20A
ACA AC+DC
AC+Hz
W
MAX
DC mV
dBm HOLDRMT
DC 20A
DCV
DCA
POWER
Power cord socket
Fuse
FUSE RATING
100
100V / 120V / 230V
8.0 VA 6.0 W 50/60 Hz
120V
230V T0.08A 250V
T0.1A 250V
120
qualifié.
WARNING
For continued fire protection, replace fuse
and rating.
qualified personnel.
only with 250V fuse of the specified type
Do not remove covers, refer servicing to
Pour éviter tout risque d'incendie, le fusible
caractéristiques identiques.
Doit être remplacé par un modèle 250V de
Ne pas ouvrir le capoy. La maintenance doit
être réalisée exclusivement par du personnel
AVERTISS
230
100V

Calibration Log
19
CALIBRATION LOG
Print out these pages and record the results. Keep it with the instrument.
Model name
GDM-824__
Serial number
________________
Date
Year___________
Month__________
Date___________
Verified by
Name____________________________
Company/Contact_________________________
Environment
Temperature______°C
Humidity______%
Operating Voltage Verification
Item
Min limit
Result
Max limit
Pass/Fail
TP10~ GND
+14.5V
____V
15.5V
Pass
Fail
TP11~ GND
-15.5V
____V
-14.5V
Pass
Fail
TP12~ GND
+2.9V
____V
+3.3v
Pass
Fail
TP13~ GND
-3.3V
____V
-2.9V
Pass
Fail
TP14~ GND
+1.6V
____V
+2.0V
Pass
Fail
TP15~ GND
6.0V
____V
+6.4V
Pass
Fail
Short Calibration (Calibration mode CL10, CL20, CL40)
Item
Min limit
Pass
Fail
ACV short calibration (CL10)
Pass
Fail
DCA, ACA, DCV, Ωshort
calibration (CL20)
Pass
Fail
400mΩshort calibration (CL40)
Pass
Fail
ACV Frequency Response Calibration (Calibration mode CL50)
Item
Min limit
Result
Max limit
Pass/Fail
200mV/50Hz
(ACmV)
–4 digits
______mV
+ 4 digits
Pass
Fail
200mV/50Hz
(AC+DC)
- 4 digits
______mV
+ 4 digits
Pass
Fail

GDM-8245 Service Manual
20
2V/50Hz
- 4 digits
______V
+ 4 digits
Pass
Fail
20V/50Hz
- 4 digits
______V
+ 4 digits
Pass
Fail
200V/50Hz
- 4 digits
______V
+ 4 digits
Pass
Fail
1000V/50Hz
- 4 digits
______V
+ 4 digits
Pass
Fail
ACV Frequency Adjustment (Calibration mode CL50)
Item
Min limit
Result
Max limit
Pass/Fail
200mV/50kHz
200.50mV
–10 digits
VC305
adjustment
200.50mV
+10 digits
Pass
Fail
4.9V/10kHz
4.9000 V -
10 digits
VC301
adjustment
4.9000 V + 10
digits
Pass
Fail
49V/10kHz
49.000 - 10
digits
VC302
adjustment
49.000 + 10
digits
Pass
Fail
490V/1kHz
490.00 V -
10 digits
VC303
adjustment
490.00 V + 10
digits
Pass
Fail
1000V/1kHz
(check)
- 20 digits
______V
+ 20 digits
Pass
Fail
Capacitance Open Calibration (CL30)
Item
Min limit
Pass
Fail
Open Calibration (CL30)
Pass
Fail
Resistance Range Calibration
Item
Min limit
Result
Max limit
Pass/Fail
400Ω (500Ω
Range)
- 3 digits
______Ω
+ 3 digits
Pass
Fail
4 kΩ (5kΩ Range)
- 3 digits
______Ω
+ 3 digits
Pass
Fail
40 kΩ (50kΩ
Range)
- 3 digits
______Ω
+ 3 digits
Pass
Fail
400 kΩ (500kΩ
Range)
- 3 digits
______Ω
+ 3 digits
Pass
Fail
3M Ω(5MΩ
Range)
- 3 digits
______Ω
+ 3 digits
Pass
Fail
9.907 MΩ (20 MΩ
Range)
- 3 digits
______Ω
+ 3 digits
Pass
Fail