Fluke 52120A User Manual page 87

•
Do a Product dc zero adjustment
•
Do a Product voltage input dc gain adjustment (also sets the low frequency
calibration constant).
•
Do a Product current input dc gain adjustment.
•
Do a Product ac Flatness adjustment at 6 kHz.
1. Connect the GPIB interface to an instrument controller.
2. To setup the Product for adjustments, send the command: :CAL:SEC:PASS
"ADJUST"
3. Set the Product to standby with the command: :OUTP OFF
You can also push S to set the Product in the standby mode. You must
push L before all other front-panel operations.
4. Push S on the 5720A.
5. Connect the 2 A shunt between the Product output and the input of the DMM. See
Figure 5-2.
6. Set the DMM to the DCV function on the 1V range.
7. Set the DMM to Resolution 6.
8. After the DMM measurement settles, push the Offset key.
If the DMM does not show a measurement between 0.000008 V and
-0.000008 V, verify the test equipment controls and connections. Then do
the offset procedure again.
9. Set the DMM 'z' store to the 2 A shunt resistance value.
10. Turn on the '÷z' store on the DMM.
11. Write in the DMM measurement in the measured Current column in the Output Off
and 2 A shunt row of Table 5-7.
12. Set the 5720A output to 0 V dc.
13. Push M on the on the 5720A.
14. Push B on the Product.
15. Push M on the Product.
16. After the measurement is stable, write the value shown on the DMM in the
Measured Current column of Table 5-7.
17. Send the command: :CAL:ADJ? OFFS,0.00000,<measured value>
18. Set the 5720A output to the values in Table 5-7 for the 2 A shunt and 2 V dc and -
2 V dc adjustment points. Write the values shown on the DMM in the Measured
Current column of Table 5-7. Calculate the average amplitude of the absolute
positive and negative values as given above.
19. Send the command: :CAL:ADJ? GAIN,2.00000,<calculated value>
20. Push S on the 5720A.
21. Push A on the Product.
22. Set the 5720A output to the values in Table 5-7 for the 2 A shunt and 200 mA dc
Note
Note
5
Calibration
Introduction
5-17