Keithley 2430 User Manual

Calibration 2-3
• If an error occurs during calibration, the Model 2430 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 in
-
sulation, creating a shock hazard.
CAUTION The maximum voltage between INPUT/OUTPUT HI and LO or 4-WIRE
SENSE HI and LO is 125V 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 2430, which
are protected by a replaceable battery when power is off. Typical life for the bat
-
tery is approximately 10 years, but the battery should be replaced if the voltage
drops below 2.5V regardless of age. See Section 4 for battery replacement de
-
tails.
Recommended calibration equipment
Table 2-1 lists the recommended equipment for the calibration procedures. You can use al-
ternate equipment as long as that equipment has specifications comparable to those listed in the
table. For optimum calibration accuracy, test equipment specifications should be at least four
times better than corresponding Model 2430 specifications.
Table 2-1
Recommended calibration equipment
Description Manufacturer/Model Specifications
Digital Multimeter Hewlett Packard
HP3458A
DC Voltage
1
DC Current
1
1V:
10V:
100V:
10μA:
100μA:
1mA:
10mA:
100mA:
1A:
±5.6ppm
±4.3ppm
±6.3ppm
±25ppm
±23ppm
±20ppm
±20ppm
±35ppm
±110ppm
Precision Resistor
2
Isotec RUG-Z-1R00-0.1 1Ω, ±0.1%, 100W
1. 90-day, full-range accuracy specifications of ranges required for various measurement points.
2. Necessary for calibration of 3A current range. Resistor must be characterized to ±300ppm or better using recom-
mended DMM before calibrating 3A range.

Keithley 2430 Specifications

General

Brand	Keithley
Model	2430
Category	Measuring Instruments
Language	English