15-6 Performance Verification Model 6485 Instruction Manual
Performing the verification test procedures
Test considerations
When performing the verification procedures:
• Be sure to restore Model 6485 factory front panel defaults, and perform voltage
offset calibration as outlined below.
• Make sure that the test equipment is properly warmed up and properly connected to
the Model 6485 INPUT jack.
• Be sure the test equipment is set up for the proper function and range.
• Allow the input signal to settle before making a measurement.
• Do not connect test equipment to the Model 6485 through a scanner, multiplexer,
or other switching equipment.
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.
Restoring factory defaults
Before performing the verification procedure, restore the instrument to its factory front
panel defaults as follows:
1. Press SETUP. The instrument will display the following prompt:
RESTORE: FACT
2. Using either RANGE key, select FACT, then restore the factory default conditions
by pressing ENTER.
NOTE You can use either RANGE key to select among FACT, GPIB, and USR0 to USR2
setups. Be sure you use FACT defaults for the verification procedure.
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