Keithley 2701, Service Manual

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Model 2701 Service Manual Calibration 2-5
Comprehensive calibration
The comprehensive calibration procedure calibrates the DCV, DCI, ACV, ACI, and ohms
functions. You can also choose to calibrate only the DCV/DCI and resistance or ACV/ACI
functions.
These procedures are usually the only calibration required in the field. Manufacturing cali-
bration is normally done only at the factory, but it should also be done in the field if the unit has
been repaired. See “Manufacturing calibration” at the end of this section for more information.
Calibration cycle
Perform comprehensive calibration at least once a year or every 90 days to ensure the unit
meets the corresponding specifications.
Recommended equipment
Table 2-1 lists the recommended equipment you need for comprehensive, DC-only, and
AC-only calibration procedures. You can use alternate equipment, such as a DC transfer stan-
dard and characterized resistors, as long as that equipment has specifications at least as good as
those listed in
Table 2-1 .
Table 2-1
Recommended equipment for comprehensive calibration
Fluke 5700A Calibrator:
DC voltage
AC voltage
(1kHz, 50kHz)*
DC current
AC current
(1kHz)
Resistance
10V ±5ppm
100V ±7ppm 10mV ±710ppm
100mV ±200ppm
1V ±82ppm
10V ±82ppm
100V ±90ppm
700V ±85ppm 10mA ±60ppm
100mA ±70ppm
1A ±110ppm 100mA ±190ppm
1A ±690ppm
2A ±670ppm 1k
Ω
±12ppm
10k
Ω
±11ppm
100k
Ω
±13ppm
1M
Ω
±18ppm
Miscellaneous equipment:
Keithley 8610 low-thermal shorting plug
Double banana plug to double banana plug shielded cable
BNC to double banana plug shielded cable
*1kHz specifications. 10mV and 700V points require 1kHz only. All calibrator specifications are 90-day, 23°C ±5°C specifications
and indicate total absolute uncertainty at specified output.