Calibrators
Calibration Adjustment
61
Calibrating Low Ohms Source
Connect the UUT as shown in Figure 30.
aal13f.eps
Figure 30. Low Ohms Source Calibration Connections
After making the proper connections, type “7” then press the Enter key on the PC
keyboard. Input directions are displayed at the bottom of the calibration menu:
Enter Selection:
First Calibration Point. Enter Ohms displayed:
Second Calibration Point. Enter Ohms displayed:
The 8508A should be locked in the 2 kΩ range (1.0 mA excitation). Enter each of the two
calibration points as prompted.
Note
For best accuracy at:
15 Ohms: Use 8508A 200
Ω
range, 4-wire, LOI On
360 Ohms: Use 8508A 2 k
Ω
range, 4-wire, LOI Off
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