Keithley 2000, Calibration Manual

Page: 16 / 88

Verifying DC voltage
Check DC voltage accuracy by applying accurate DC voltages from the calibrator to the Mod-
el 2000 INPUT jacks and verifying that the display reads within specified limits. Follow these
steps to verify the DC voltage:
1. Connect the Model 2000 HI and LO INPUT jacks to the DC voltage calibrator as shown
in Figure 1-1.
NOTE
Use shielded, low-thermal connections when testing the 100mV and 1V ranges to
avoid errors caused by noise or thermal effects. Connect the shield to the calibrator’s
output LO terminal.
2. Select the DC volts function by pressing the DCV key, and set the Model 2000 to the
100mV range.
3. Set the calibrator output to 0.00000mV DC, and allow the reading to settle.
4. Enable the Model 2000 REL mode. Leave REL enabled for the remainder of the DC
volts verification tests.
5. Source positive and negative full-scale voltages for each of the ranges listed in Table 1-
2. For each voltage setting, be sure that the reading is within stated limits.
Table 1-2
DCV reading limits
DCV
Range
Applied DC
voltage*
Reading limit
(1 year, 18°C-28°C)
100mV
1V
10V
100V
1000V
100.0000mV
1.000000V
10.00000V
100.0000V
1000.000V
99.9915 to 100.0085mV
0.999963 to 1.000037V
9.99965 to 10.00035V
99.9949 to 100.0051V
999.939 to 1000.061V
* Source positive and negative values for each range.
2000 MULTIMETER
!
R
Output HI
Input
LO
Output
LO
Model 2000
5700A Calibrator (Output DC Voltage)
Note : Use shielded, low-thermal cables
for 100mV and 1V ranges.
Input HI
Performance Verification 1-7
Figure 1-1
Connections for
DC volts verifica-
tion