2-3 Model 2400 Service Manual
Calibration
2400-902-01 (G - Feb 2006)
Calibration considerations
When performing the calibration procedures:
• Make sure that the test equipment is properly warmed up and connected to the
Model
2400 front panel INPUT/ OUTPUT jacks. Also be certain that the front panel
jacks are selected with the TERMINALS switch.
• Always allow the source signal to settle before calibrating each point.
• Do not connect test equipment to the Model 2400 through a scanner or other switching
equipment.
• If an error occurs during calibration, the Model 2400 will generate an appropriate error
message. See Appendix B for more information.
WARNING The maximum common-mode voltage (voltage between LO and chassis
ground) is 250V peak. Exceeding this value may cause a breakdown in
insulation, creating a shock hazard.
The front and rear terminals of the Model 2400 are rated for connection to
circuits rated Installation Category I only. Do not connect the Model 2400
terminals to CAT II, CAT III, or CAT IV circuits. Connection of the
SourceMeter Input/Output terminals to circuits higher than CAT I can
cause damage to the equipment or expose the operator to hazardous volt
-
age.
Hazardous voltages may be present on the output and guard terminals. To
prevent electrical shock that could cause injury or death, NEVER make or
break connections to the Model 2400 while the unit is on. Power off the
equipment from the front panel or disconnect the main power cord from the
rear of the Model 2400 before handling cables connected to the outputs. Put
-
ting the equipment into standby mode does not guarantee the outputs are
not powered if a hardware or software fault occurs.
CAUTION The maximum voltage between INPUT/OUTPUT HI and LO or 4-WIRE
SENSE HI and LO is 250V peak. The maximum voltage between INPUT/
OUTPUT HI and 4-WIRE SENSE HI or between INPUT/OUTPUT LO
and 4-WIRE SENSE LO is 5V. Exceeding these voltage values may result
in instrument damage.
Calibration cycle
Perform calibration at least once a year to ensure the unit meets or exceeds its specifications.
NOTE Calibration constants are stored in volatile memories of the Model 2400, which are
protected by a replaceable battery when power is off. Typical life for the battery is
approximately ten years, but the battery should be replaced if the voltage drops
below 2.5V regardless of age. See Section 4 for battery replacement details.
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