GW Instek GDM-8245 - DCA Verification

GDM-8245 Service Manual
72
≤2A range
20A range
Calibration
procedure
1. Set the range to 500uA (DCA mode).
2. Short the input terminals. Verify the results.
3. Repeat the procedure for the remainder of the ranges;
5.0mA~20A (DCA, DC 20A).
Note: Ensure the correct terminal is used for each
range.
DCA Verification (short) is complete
DCA Verification
Accepted range
(Digits): 490uA±70, 4.9mA±70, 49mA±70, 490mA±70,
1.9A±41, 19A*±41
Equipment
 Multimeter calibrator
 Test leads
Configurations
 GDM-8245: 500uA, 5.0mA, 50mA, 500mA, 2A, 20A
 Calibrator: 490uA, 4.9mA, 49mA, 490mA,1.9A, 19A*
<2A
<20A*
*Do not input 19A for more than 1 second. Exceeding 1
second may blow the fuse.
Calibration
procedure
1. Set the range to 500uA.
2. Input 490uA. Verify a DC current of 490uA±70 digits.