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Calibration
2-4
2.7
Calibration errors
The Model 2002 checks for errors after each calibration step,
minimizing the possibility that improper calibration may
occur due to operator error. The following paragraphs dis-
cuss both front panel and bus error reporting.
2.7.1 Front panel error reporting
If an error is detected during comprehensive calibration, the
instrument will display an appropriate error message (see
Appendix C).
2.7.2 IEEE-488 bus error reporting
You can detect errors over the bus by testing the state of EAV
(Error Available) bit (bit 2) in the status byte. (Use the *STB?
query or serial polling to request the status byte.) If you wish
to generate an SRQ (Service Request) on errors, send "*SRE
4" to the instrument to enable SRQ on errors.
You can query the instrument for the type of error by using
the ":SYSTem:ERRor?" query. The Model 2002 will re-
spond with the error number and a text message describing
the nature of the error. Appendix C summarizes calibration
errors.
2.8
Comprehensive calibration
The comprehensive calibration procedure calibrates the
DCV, DCI, and ohms functions. At the end of the front panel
calibration procedure, AC self-calibration is also performed
to complete the calibration process.
Comprehensive calibration should be performed at least
once a year, or every 90 days to ensure the unit meets the cor-
responding specifications.
The comprehensive calibration procedure covered in this
paragraph is normally the only calibration required in the
field. However, if the unit has been repaired, you should per-
form the low-level calibration procedure explained in para-
graph 2.10.
2.8.1 Recommended equipment for
comprehensive calibration
Table 2-2 lists all test equipment recommended for compre-
hensive calibration. Alternate equipment (such as a DC
transfer standard and characterized resistors) may be used as
long as that equipment has specifications at least as good as
those listed in the table.
2.8.2 Front panel comprehensive calibration
Follow the steps below to calibrate the Model 2002 from the
front panel. Refer to paragraph 2.8.3 below for the procedure
to calibrate the unit over the IEEE-488 bus. Table 2-3 sum-
marizes the front panel calibration procedure.
Table 2-2
Recommended equipment for comprehensive calibration
Mfg.
Model
Description
Specifications*
Fluke
5700A
Calibrator
±5ppm basic
uncertainty.
DC Voltage:
2V: ±7ppm
20V: ±5ppm
Resistance:
19
Ω
: ±26ppm
190
Ω
: ±17ppm
1.9k
Ω
: ±11ppm
19k
Ω
: ±11ppm
100k
Ω
: ±13ppm
1M
Ω
: ±18ppm
DC Current:
200µA: ±100ppm
2mA: ±55ppm
20mA: ±55ppm
200mA: ±65ppm
1A: ±110ppm
Keithley
8610
Low-thermal
shorting plug
* 90-day calibrator specifications shown include total uncertainty at spec-
ified output.
Summary of Contents for 2002
Page 1: ...Model 2002Multimeter Calibration Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E...
Page 9: ...iv...
Page 11: ...vi...
Page 55: ...Calibration 2 26...
Page 70: ...Specifications A 1 A Specifications...
Page 83: ...A 14 Specifications...
Page 101: ...Calibration Programs B 18...
Page 113: ......