GW Instek GDM–825 A Series Leitfaden

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

Connection/

Function

8255A

8251A

Remark

Please refer to appendix 2 for 4WR connection

4WR

It is necessary to use 4 wire

resistance measurement to

compensate for EMF. Wait for 60

seconds before starting adjustment

4WR

100R

4WR

1KR

4WR

10KR

4WR

100KR

4WR

1MR

4WR

10MR

Please refer to appendix 3 for 2WR connection

2WR

2W100MR

100MR

Remove all inputs from the terminals

OPEN

Use the INPUT V and the COM terminal for DCV or ACV calibration.

DCV

190mV

100mV

DCV

-190mV

-100mV

DCV

1.9V

DCV

19V

10V

DCV

190V

100V

DCV

750V

ACV

19mV

1kHz

ACV

190mV

100mV

1kHz

ACV

1.9V

1kHz

ACV

19V

10V

1kHz

ACV

190V

100V

1kHz

Adjustment Procedure (Manual procedure)

Model no.

GDM–825XA

Document No.

TO –XX -XXX

Page 1 of

NO.

Item

Condition

ACV

750V

1kHz

Use the 2A input and the COM terminal for DCmA or ACmA calibration.

DCmA

10mA

DCmA

100mA

ACmA

1.9mA

1kHz

ACmA

19mA

10mA

1kHz

ACmA

100mA

1kHz

Use the 10A input and the COM terminal for DCA or ACA calibration.

DCA

10A

ACA

1.9A

1kHz

ACA

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.

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