HP 3457A Service Manual page 19

General Information 3457A
1-12
Table 1-1. Specifications
TRUE RMS AC VOLTAGE
(AC and DC Coupled)
INPUT CHARACTERISTICS:
MAXIMUM RESOLUTION
READING
RANGE |6 1/2 digits|6 1/2 diyits|5 1/2 digits]4 1/2 digits|3 1/2 digits
30 mv | 32.50000 mv 10 nv 100 nv 1 uv 10 uv
300 mv} 325.0000 mv 100 nv 1 uv 10 uv 100 uv
3 3.250000 v Tw 10 uv 100 uv 1m
30 V 32.50000 v 10 uv 100 uv 1 mv 10 mv
300 Vv 303.0000 v 100 uv 1 mv 10 mv 100 mv
INPUT IMPEDANCE :
1 megohm 1% shunted by < 90 pF (¢ < 115 pF rear input).
MAXIMUM INPUT VOLTAGE: (non-destructive)
Input Terminals: + 450V peak.
HI or LO to Earth Ground: + 450V peak.
CREST FACTOR: 3.5 to 1 at full-scale.
MEASUREMENT ACCURACY - AC COUPLED: +(% of reading + number of counts)
Specifications apply for sine-wave inputs > 10% of range with DC component < 10% of the AC
component, with Auto-zero ON, AC slow filter ON (ACBAND 20), and after 2 hour warm-up.
For AC inputs between 3% and 10% of full-scale and < 20KHz, add 0.7% to the percent of read-
ing figures.
For pre-programmed settling times, add .1% of input voltage step to accuracy specifications
for the first reading.
HOUR: Tcal + 1° (ACV Function) After 2 hour warm up Accuracy relative to calibration standard
30 mV to 30 V ranges.
FREQUENCY PERCENT NUMBER OF COUNTS
OF >= 1 PLC 0.1 PLC +005 PLC -0005 PLC
READING |6 1/2 digits]5 1/2 digits|4 1/2 digits]3 1/2 digits
20Hz2-45Hz - 720 76 12
45Hz-100Hz 720 76 12
100Hz2-20KHz 720 76 ce
** 400Hz-20KHz a 720 55
20kiz-100KHz bs 1700 23
100KHz-300KHz = 9300 98
300KHz- IMHz 66000 664