Keithley 2000, Calibration Manual

Page: 19 / 88

Verifying DC current
Check DC current accuracy by applying accurate DC currents from the calibrator to the
AMPS input of the Model 2000 and verifying that the display reads within specified limits. Fol-
low these steps to verify DC current accuracy:
1. Connect the Model 2000 AMPS and INPUT LO jacks to the calibrator as shown in
Figure 1-3.
2. Select the DC current measurement function by pressing the DCI key.
3. Set the Model 2000 for the 10mA range.
4. Source positive and negative full-scale currents for each of the ranges listed in Table 1-4,
and verify that the readings for each range are within stated limits.
Table 1-4
DCI limits
DCI
Range
Applied DC
current*
Reading limits
(1 year, 18°C-28°C)
10mA
100mA
1A
3A
10.0000mA
100.0000mA
1.000000A
2.20000A
9.99420 to 10.00580mA
99.8700 to 100.1300mA
0.999120 to 1.000880A
2.19724 to 2.20276A
* Source positive and negative currents with values shown.
2000 MULTIMETER
!
R
Output HI
Input
LO
Output
LO
Model 2000
5700A Calibrator (Output DC Current)
Amps
Note : Be sure calibrator is set for
normal current output.
1-10 Performance Verification
Figure 1-3
Connections for
DC current
verification
Section 1 Page 10 Monday, December 10, 2001 9:11 PM