HP 3457A Service Manual page 11

General Information 3457A
Table 1-1. Specifications
DC VOLTS (Cont'd)
1 YEAR: Teal + 5°C After 1 hour warm-up
RANGE | % READING NUMBER OF COUNTS
100 PLC* 10 PLC* 1 PLC*® -1 PLC* -005 PLC* -0005 PLC*
6 1/2 digits|]6 1/2 digits|6 1/2 digits|5 1/2 digits|4 1/2 digits|3 1/2 digits
30 mv 0045 365 500 70
300 mv 0035 39 50
3 0025 6 *
30 Vv +0040 19 30
300 v 0055 6 7
* PLC = Integration Time in Power Line Cycles. When using integration times of 100 PLC, 10 PLC,
or 1PLC; multiply Number of Counts in the Measurement Accuracy Tables by 0.1 for 5 1/2 digit
readings, 0.01 for 4 1/2 digit readings and 0.001 for 3 1/2 digit readings.
Teal = the temperature of the environment where the 3457A was calibrated. Calibration should
be performed with the environment temperature between 18 and 28 degrees centigrade.
TEMPERATURE COEFFICIENT: *(% of Reading + Number of Counts)/°C
6 1/2 Digits Displayed
RANGE | Auto-Zero ON Auto-Zero OFF*
30 mv +0005 -0005 + 40
300 mv ~0005 0005 + 13
3 0005 . -0005 + 10.3
30 Vv ~0005 . +0005 + 11.0
300 Vv 0005 ' -0005 + 10.3
* Specifications given are for a stable environment (+ 1°C) and over a ten minute period.
Multiply Number of Counts by 0.1 for 5 1/2 digit readings, 0.01 for 4 1/2 digit
readings and 0.001 for 3 1/2 digit readings.
NOISE REJECTION:
With 1 Kohm imbalance in the LO lead and line frequency (50 or 60 Hz)
INTEGRATION TIME
100 PLC | 10 PLC | 1 PLC | -1 PLC | -005 tc | .0005 PLC
AC NMR 90 db 80 db 60 db 0 db 0 db 0 db
AC ECMR 160 db 156 db 136 db 76 db 76 db 76 db
DC CMR 140 db 140 db 140 db 140 db 140 db 140 db