Model 6485 Instruction Manual Calibration 16-3
Calibration considerations
When performing the calibration procedures:
• Make sure that the test equipment is properly warmed up and connected to the
Model 6485 INPUT jack.
• Always allow the source signal to settle before calibrating each point.
• Do not connect test equipment to the Model 6485 through a scanner or other
switching equipment.
• If an error occurs during calibration the Model 6485 will generate an appropriate
error message.
WARNING The maximum safe voltage between picoammeter LO and chassis
ground (common mode voltage) is 42V. The Model 6485 does not inter-
nally limit the LO to chassis voltage. Exceeding 42V can create a shock
hazard. The LO to chassis breakdown voltage is 500V. Exceeding this
voltage may cause damage to the instrument.
CAUTION Maximum continuous input voltage is 220V DC. Exceeding this value
may cause instrument damage.
Calibration cycle
Perform verification at least once a year to ensure the unit meets or exceeds its specifica-
tions. Calibrate if necessary.
Recommended calibration equipment
Table 16-1 lists the recommended equipment for the calibration procedures. You can use
alternate equipment, but keep in mind that test equipment uncertainty will affect calibra-
tion accuracy. Calibration equipment should have accuracy specifications at least four
times better than corresponding Model 6485 specifications. Note, however, that the rec-
ommended calibrator listed in Table 16-1 does not meet this requirement for 20µA output.
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