Performance Verification
4-5
5. Select the SLOW response filter as follows:
A. Press the CHAN key. The instrument will display
the following:
CONFIG PREAMP
CONTROL
FILTER
CALIBRATION
B. Select FILTER, then press ENTER. The unit will
display filter response selections:
SELECT PREAMP FILTER
FAST
MEDIUM
SLOW
C. Select the SLOW filter response, then press
ENTER.
D. Press EXIT to return to normal display.
6. Set the low-thermal divider division ratio to 10
4
, and
select the POS+ polarity position.
7. Lock the calibrator on the 2.2V range, and enable
external sensing.
8. Set the calibrator output to 0.00000VDC, and allow
the reading to settle.
9. Enable the Model 2001 REL mode.
10. Set the calibrator output to +0.190000VDC, and
allow the reading to settle.
11. Verify that the Model 2001 reading is within the lim-
its summarized in Table 4-2.
12. Repeat steps 8 through 11 for the remaining ranges,
voltages, and divider ratios listed in Table 4-2. Be
sure to re-zero each range before making the
measurement.
13. Repeat the procedure for each of the ranges with neg-
ative Model 1801 input voltages of the same magni-
tude as those listed in Table 4-2. Set the divider to the
NEG- polarity position to reverse polarity.
Table 4-2
Limits for DC volts verification
1801 range
Calibrator
voltage
Low-thermal
divider ratio
1801 input
voltage
Allowable readings (1 year, 23 ±1°C)
20µV
200µV
2mV
0.190000V
0.190000V
0.190000V
10
4
: 1
10
3
: 1
10
2
: 1
19.00000µV
190.0000µV
1.900000mV
18.99006µV to 19.00994µV
189.9466µV to 190.0534µV
1.899494mV to 1.900506mV
Notes:
1. Repeat procedure for negative voltages.
2. Reading limits do not include calibrator and low-thermal divider uncertainty.