Model 6485 Instruction Manual Performance Verification 15-7
Offset voltage calibration
Before performing the performance verification procedure, perform offset voltage calibra-
tion as outlined below.
1. Press the MENU key, select CAL, then press ENTER.
2. The unit will display the following:
CAL: VOFFSET
3. Press ENTER. The instrument will prompt as follows:
INPUT CAP
4. Connect the BNC shielding cap to the INPUT jack.
5. Press ENTER to complete offset voltage calibration.
6. Press EXIT to return to normal display.
Current measurement accuracy
Follow the steps below to verify that Model 6485 current measurement accuracy is within
specified limits. The test involves applying accurate DC currents and then verifying that
the Model 6485 current readings are within required limits.
20µA-20mA range accuracy
1. Connect the current calibrator to the Model 6485 INPUT jack, as shown in
Figure 15-1. Use the appropriate low-noise coaxial cable, and BNC-to-dual banana
plug adapter where shown.
2. Set the Model 6485 to the 20µA range using the up or down RANGE key.
3. With zero check enabled, zero correct the Model 6485, then disable zero check.
4. Set the calibrator current to 0.0000µA and make sure the output is turned on.
5. Enable the Model 6485 REL mode. Leave REL enabled for the remainder of the
test.
6. Verify current measurement accuracy for each of the currents listed in Table 15-2.
For each test point:
• Select the correct Model 6485 measurement range.
• Set the calibrator current to the indicated value.
• Verify that the Model 6485 current reading is within the limits given in the
table.
7. Repeat the procedure for negative source currents with the same magnitudes as
those listed in Table 15-2.
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