GW Instek GDM–825 A Series Guide

Adjustment Procedure (Manual procedure)
Model no.
GDM–825XA
Document No.
TO –XX -XXX
Page 1 of
NO.
Item
Condition
Precaution:
1) Precautions before adjustment:
A. Warm up the device for 60 minutes before adjustment.
B. Retain an ambient temperature of 23°C± 2°C, with a relative humidity below 75%.
2) Equipment required:
A. Fluke 5720A+ Fluke 5725A( same level or above)
B. Calibration Key(GDM-01)
Step 1
Manual ADJ MODE
1. Power off.
2. Press and hold “2ND”＋POWER ON.
3. CAL 01 is displayed on the right upper corner. Hexadecimal
encoding value is displayed on the left.
4. Release “2ND” to enter manual ADJ MODE
Step 2
ADJ unlock
1. Insert the Calibration Key (GDM-01) into the CAL Key Port on the
rear panel of the GDM-825XA.
Step 3
ADJ and SAVE
1. Push the Up and Down buttons ( ) to select the CAL
CODE.
2. Select a CAL CODE and input the corresponding function signal
(adjustment item). Please refer to Appendix 1 for the CAL CODE
and the corresponding function signal.
3. After inputting the function signal, users need to wait for the Fluke
5720A output signal to be stable. i.e. “u”disappears on the Fluke
5720A. At that time, users can press the AUTO button ( )
on the GDM-825XA panel to save.
4. When the save is in process, the “＊”will stop flashing. Users
can’t proceed to the next step until the “＊”begins to flash.
CAL Key RS232C

Adjustment Procedure (Manual procedure)
Model no.
GDM–825XA
Document No.
TO –XX -XXX
Page 1 of
NO.
Item
Condition
Step 4
END
1. After adjustment is complete, take out the Calibration Key
(GDM-01) from the CAL Key Port and reset the power switch.
Appendix 1
CAL CODE
CAL CODE
Connection/
Function
8255A
8251A
Remark
Please refer to appendix 2 for 4WR connection
1
4WR
0R
0R
It is necessary to use 4 wire
resistance measurement to
compensate for EMF. Wait for 60
seconds before starting adjustment
3
4WR
100R
100R
4
4WR
1KR
1KR
5
4WR
10KR
10KR
6
4WR
100KR
100KR
7
4WR
1MR
1MR
8
4WR
10MR
10MR
Please refer to appendix 3 for 2WR connection
9
2WR
2W100MR
100MR
Remove all inputs from the terminals
2
OPEN
OPEN
OPEN
Use the INPUT V and the COM terminal for DCV or ACV calibration.
11
DCV
0V
0V
12
DCV
190mV
100mV
13
DCV
-190mV
-100mV
14
DCV
1.9V
1V
15
DCV
19V
10V
16
DCV
190V
100V
17
DCV
750V
750V
61
ACV
19mV
19mV
1kHz
62
ACV
190mV
100mV
1kHz
63
ACV
1.9V
1V
1kHz
64
ACV
19V
10V
1kHz
65
ACV
190V
100V
1kHz

Adjustment Procedure (Manual procedure)
Model no.
GDM–825XA
Document No.
TO –XX -XXX
Page 1 of
NO.
Item
Condition
66
ACV
750V
750V
1kHz
Use the 2A input and the COM terminal for DCmA or ACmA calibration.
41
DCmA
0A
0A
42
DCmA
10mA
10mA
43
DCmA
100mA
100mA
21
ACmA
1.9mA
1.9mA
1kHz
22
ACmA
19mA
10mA
1kHz
23
ACmA
100mA
100mA
1kHz
Use the 10A input and the COM terminal for DCA or ACA calibration.
31
DCA
0A
0A
32
DCA
10A
10A
51
ACA
1.9A
1A
1kHz
52
ACA
10A
10A
1kHz
Appendix 2
4WR
Connection
a. 4WR is a connection method for 4 wires.
b. When 4WR is performed, EX SNS in Fluke5720A should be turned ON
c. The 4WR connection method is shown as the diagram below.

Adjustment Procedure (Manual procedure)
Model no.
GDM–825XA
Document No.
TO –XX -XXX
Page 1 of
NO.
Item
Condition
Appendix 3
2WR
Connection
a. 2WR is a connection method for 2 wires.
b. When 2WR is performed, EX SNS in Fluke5720A should be turned OFF
c. 2WR connection method is shown as the diagram below.
Appendix 4
Common
problems
1. If there is no display on the screen after turning the power on Please
plug out the Calibration Key, and turn the power on again.
2. If the resistance value is unstable at the 100MΩreange When
calibrating the high resistance, users need to use a high-voltage
insulated cable (over 1KV rating) as the test connection cable.
3. If the device is still not accurate after all resistance ranges have been
adjusted Because the 0R and OPEN affect all resistance ranges
parameter, users need to adjust CAL CODE1 through to 9 all at once.
You cannot calibrate each CAL CODE 1 separately.
4. AC10mV & AC1mA is not accurate Because AC10mV and AC1mA
is calculated from the ATE program, users can’t adjust this manually. If
AC10mV or AC1mA is not accurate, it is necessary to use the ATE
program to calibrate them again.