Keithley 2001 Calibration Manual

Calibration
2-15
2.10.3 Front panel low-level calibration procedure
Follow the steps below to perform low-level calibration from
the front panel.
Procedure
1. Turn off the power if the instrument is presently turned
on.
2. While pressing in on the recessed CAL switch, turn on
the power. The instrument will display the following to
indicated it is ready for low-level calibration:
MANUFACTURING CAL
3. Press ENTER. The instrument will display the follow-
ing:
DC CALIBRATION PHASE
4. Allow the Model 2001 to warm up for at least one hour
before performing calibration.
5. Press ENTER. The instrument will display the follow-
ing prompt.
SHORT-CIRCUIT INPUTS
6. Connect the Model 8610 low-thermal short to the instru-
ment INPUT and SENSE terminals, as shown in Figure
2-1. Wait three minutes before proceeding to allow for
thermal equilibrium.
NOTE
Be sure to properly connect HI, LO, and
SENSE terminals. Keep drafts away from
low-thermal connections to avoid thermal
drift, which could affect calibration accu-
racy.
7. Press ENTER. The instrument will then begin DC zero
calibration. While calibration is in progress, the follow-
ing will be displayed:
Performing Short-Ckt Calibration
8. When the DC zero calibration step is completed, the fol-
lowing message will be displayed:
CONNECT 2 VDC CAL
9. Disconnect the low-thermal short, and connect the DC
calibrator to the INPUT jacks, as shown in Figure 2-2.
10. Set the DC calibrator output to +2.00000V, and make
sure that external sense is turned off.
11. Press ENTER, and note that the Model 2001 displays
the presently selected calibration voltage:
VOLTAGE = 2.0000000
(At this point, you can use the cursor and range keys to
set the calibration voltage to a value from 0.98 to 2.1V
if your calibrator cannot output 2V).
12. Press ENTER. The instrument will display the follow-
ing during calibration:
Performing 2 VDC Calibration
13. After completing 2VDC calibration, the instrument will
display the following:
CONNECT 20 VDC CAL
14. Set the DC calibrator output to +20.00000V.
15. Press ENTER, and note that the instrument displays the
calibration voltage:
VOLTAGE = 20.000000
(At this point, you can use the cursor and range keys to
set the calibration voltage to a value from 9.8 to 21V if
your calibrator cannot output 20V).
16. Press ENTER. The instrument will display the follow-
ing message to indicate it is performing 20V DC calibra-
tion:
Performing 20 VDC Calibration
17. After completing 20VDC calibration, the instrument
will display the following:
CONNECT 20kOHM RES
18. Set the calibrator output to 19.0000k¾, and turn external
sense on. (Allowable range is from 9k¾ to 20k¾.)
19. Press ENTER, and note that the Model 2001 displays
the resistance calibration value:
OHMS = 20000.000
20. Using the cursor and range keys, set the resistance value
displayed by the Model 2001 to the exact resistance val-
ue displayed by the calibrator.
21. Press ENTER, and note that the instrument displays the
following during 20k¾ calibration:
Performing 20 kOHM Calibration
22. After completing 20k¾ calibration, the instrument will
display the following:
CONNECT 1.0 MOHM RES
23. Set the calibrator output to 1.00000M¾, and turn exter-
nal sense off. (Allowable range is 800k¾ to 2M¾.)
24. Press ENTER, and note that the Model 2001 displays
the resistance calibration value:
OHMS = 1000000.00
25. Using the cursor keys, set the resistance value displayed
by the Model 2001 to the exact resistance value dis-
played by the calibrator.

Keithley 2001 Specifications

General

Model	2001
Category	Multimeter
Manufacturer	Keithley
Type	Digital Multimeter
Digits of Resolution	7.5
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Frequency Range	3 Hz to 500 kHz
Connectivity	GPIB, RS-232
Display	VFD
Resistance Accuracy	0.008% + 2.0 mΩ
Frequency Accuracy	±0.01%
DC Current Range	10 μA to 3 A
AC Current Range	10 μA to 3 A
Power Supply	100 V to 240 V AC, 45 Hz to 66 Hz