Performance Verification
1-10
1.8.3 DC current verification
DC current accuracy is checked by applying accurate DC
currents from a calibrator to the instrument AMPS input and
then verifying that the current readings fall within appropri-
ate limits.
Follow the steps below to verify DCI measurement accuracy.
CAUTION
Do not apply more than 2A, 250V to the
AMPS input, or the amps protection
fuse will blow.
1. Turn on the Model 2001 and the calibrator, and allow a
one-hour warm-up period before making measure-
ments.
2. Connect the Model 2001 to the calibrator, as shown in
Figure 1-4. Be sure to connect calibrator HI to the
AMPS input, and connect calibrator LO to INPUT LO
as shown.
3. Restore Model 2001 factory default conditions, as ex-
plained in paragraph 1.7.
Table 1-5
Limits for AC peak voltage verification
2001
ACV
range
Applied
voltage*
20Hz†
Allowable Readings (1 year, 18° to 28°C)
5kHz
25kHz
50kHz
100kHz
250kHz
500kHz
750kHz
1MHz
200mV
100mV
139.9mV
to
142.9mV
139.9mV
to
142.9mV
139.9mV
to
142.9mV
139.8mV
to
143.0mV
139.6mV
to
143.2mV
138.6mV
to
144.2mV
136.5mV
to
146.3mV
132.2mV
to
150.6mV
127.3mV
to
155.5mV
2V
1V
1.407V
to
1.421V
1.407V
to
1.421V
1.407V
to
1.421V
1.406V
to
1.422V
1.404V
to
1.424V
1.394V
to
1.434V
1.373V
to
1.455V
1.330V
to
1.498V
1.281V
to
1.547V
20V
10V
13.99V
to
14.29V
13.98V
to
14.30V
13.98V
to
14.30V
13.97V
to
14.31V
13.96V
to
14.32V
13.86V
to
14.42V
13.65V
to
14.63V
13.22V
to
15.06V
12.73V
to
15.55V
200V
190V
267.8V
to
269.6V
267.8V
to
269.6V
267.7V
to
269.7V
267.6V
to
269.8V
267.4V
to
270.0V
**
**
**
**
750V
750V
⎯
1054V
to
1067V
1053V
to
1068V
**
**
**
**
**
**
*Calibrator voltage is given as an RMS value. Model 2001 reading limits are peak AC values.
**CAUTION: Do not apply more than 2
×
10
7
V•Hz
†Use AC+DC input coupling for 20Hz tests only. (Use CONFIG-ACV to set coupling.)
NOTE: Limits shown do not include uncertainty calibrator.
4. Set digital filter averaging as follows:
A. From normal display, press CONFIG then DCI.
B. Select FILTER, then press ENTER.
C. Select AVERAGING, then press ENTER.
D. Using the cursor and range keys, set the averaging
parameter to 10 readings, then press ENTER.
E. Press EXIT as necessary to return to normal display.
F. If the FILT annunciator is off, press FILTER to en-
able the filter.
5. Select the DC current function (DCI) and the 200µA
range on the Model 2001.
6. Set the calibrator output to +190.0000µADC, and allow
the reading to settle.
7. Verify that the Model 2001 reading is within the limits
summarized in Table 1-6.
8. Repeat steps 6 and 7 for the remaining currents listed in
Table 1-6.
9. Repeat the procedure for each of the ranges with nega-
tive currents of the same magnitude as those listed in Ta-
ble 1-6.
