Remote Preamp Output Current Accuracy - Keithley 6430 Instruction Manual

18-20 Performance Verification
6.
Table 18-9
Remote PreAmp voltage measurement accuracy limits
Model 6430 source
and measure range
1
Measure range coupled to source range when simultaneously sourcing and measuring voltage.
2
As measured by precision digital multimeter.

Remote PreAmp output current accuracy

Follow the steps below to verify that Model 6430 Remote PreAmp output current accuracy
is within specified limits. The test involves setting the output current to each full-range value
and measuring the currents with a precision digital multimeter.
1µA-100mA range accuracy
1.
2.
3.
4.
5.
Repeat the procedure for negative source voltages with the same magnitudes as those
listed in Table 18-9.
1
Source voltage
200mV
2V
20V
200V
With the power off, connect the digital multimeter to the Model 6430 Remote PreAmp
IN/OUT HIGH jack as shown in Figure 18-6. (Connect the IN/OUT HIGH jack to the
DMM AMPS and INPUT LO jacks using the adapters shown. Use a triax-to-BNC
adapter that connects triax shell to BNC shell, and be sure to connect the cable shield to
DMM INPUT LO.)
Select the multimeter DC current measuring function.
Press the Model 6430 SOURCE I key to source current, and make sure the source out-
put is turned on.
Verify output current accuracy for the currents listed in Table 18-10. For each test point:
• Select the correct source range.
• Set the Model 6430 output current to the correct value.
• Verify that the multimeter reading is within the limits given in the table.
Repeat the procedure for negative output currents with the same magnitudes as those
listed in Table 18-10.
2
200.000mV
2.00000V
20.0000V
200.000V
Model 6430 voltage reading
limits (1 year, 18°-28°C)
199.626 to 200.374mV
1.99941 to 2.00059V
19.9955 to 20.0045V
199.960 to 200.040V