User manual

Series 3700 System Switch/Multimeter Reference Manual Section 15: Calibration
3700S-901-01 Rev. C / July 2008 15-3
Calibration considerations
When performing the calibration procedures:
Make sure that the equipment is properly warmed up and connected to the
appropriate input jacks.
Make sure the calibrator is in OPERATE mode before you complete each
calibration step.
Always let the source signal settle before calibrating each point.
If an error occurs during calibration, the Series 3700 will generate an
appropriate error message. See Error summary (on page 17-1) for more
information.
WARNING The input/output terminals of the digital multimeter (DMM)
and switch cards are rated for connection to circuits rated
Installation Category I only, with transients rated less than
1500V peak. Do not connect the DMM or switch card
terminals to CAT II, CAT III, or CAT IV circuits.
Connections of the DMM or switch card terminals to
circuits higher than CAT I can cause damage to the
equipment or expose the operator to hazardous voltages.
Calibration cycle
Perform calibration at least once a year, or every 90 days to ensure the unit
meets the corresponding specifications.
Recommended equipment
The following table lists the recommended equipment and settings you need for
DC-only, and AC-only calibration procedures. Alternate equipment may be used,
such as a DC transfer standard and characterized resistors, as long as the
equipment has specifications at least as good as those listed in the table. In
general, equipment uncertainty should be at least four times better (more
accurate) than the corresponding Series 3700 specifications.
NOTE The Keithley Instruments Model 3706-190 backplane connector board
is an accessory that can be used to make connections to the
calibrator. Additional boards, such as a 4-wire short or the discrete
resistors, would also be convenient to eliminate rewiring for different
setups used in verification.