Table of Contents
Advertisement
Chapter 9 Specifications
AC Measurement and Operating Characteristics
AC Measurement and Operating Characteristics
AC Measurement Characteristics
True RMS AC Voltage
Measurement Method:
AC-coupled True RMS – measures
the ac component of input with up
to 300 Vdc of bias on any range
Crest Factor:
Maximum 5:1 at Full Scale
Additional Crest Factor
[2]
Errors (non-sinewave):
Crest Factor 1-2: 0.05% of reading
Crest Factor 2-3: 0.15% of reading
Crest Factor 3-4: 0.30% of reading
Crest Factor 4-5: 0.40% of reading
AC Filter Bandwidth:
Slow
3 Hz – 300 kHz
Medium
20 Hz – 300 kHz
Fast
200 Hz – 300 kHz
Input Impedance:
1 M
Input Protection:
300 Vrms on all ranges
Frequency and Period
Measurement Method:
Reciprocal counting technique
Voltage Ranges:
Same as AC Voltage function
Gate Time:
1s, 100 ms, or 10 ms
Measurement Timeout:
Selectable 3 Hz, 20 Hz, 200 Hz LF limit
True RMS AC Current
Measurement Method:
Direct coupled to the fuse and
shunt. AC-coupled True RMS
measurement (measures the
ac component only)
Shunt Resistance:
5 for 10 mA; 0.1 for 100 mA, 1A
Input Protection:
1.5A 250 V fuse on HP 34901A module
[3]
Measurement Noise Rejection
AC CMRR:
70 dB
Measurement Considerations (Frequency and Period)
All frequency counters are susceptible to error when measuring
low-voltage, low-frequency signals. Shielding inputs from
external noise pickup is critical for minimizing measurement errors.
[1]
2%, in parallel with 150 pF
AC Operating Characteristics
[5]
Function
Digits
Readings/s
ACV, ACI:
6
1 2
7 sec/reading
6
1 2
6
1 2
6
1 2
6
1 2
Single Channel Measurement Rates
Function
Resolution
ACV:
6
1 2
Slow (3 Hz)
6
1 2
Medium (20 Hz)
6
1 2
Fast (200 Hz)
[7]
6
1 2
Frequency, Period:
6
1 2
Digits (1s gate)
6
1 2
Digits (1s gate)
5
1 2
Digits (100 ms)
5
1 2
Digits (100 ms)
4
1 2
Digits (10 ms)
4
1 2
Digits (10 ms)
[1] 300 Vrms isolation voltage (ch-ch, ch-earth)
[2] For frequencies below 100 Hz, slow AC filter specified for
sinewave input only
[3] For 1 k unbalance in LO lead
[4] Maximum reading rates for 0.01% of ac step additional error.
Additional settling delay required when input dc level varies.
[5] 6
digits=22 bits, 5
digits=18 bits, 4
1 2
1 2
[6] For external trigger or remote operation using default
settling delay (Delay Auto)
[7] Maximum limit with default settling delays defeated
[8] For fixed function and range, readings to memory,
scaling and alarms turned off
[4]
AC Filter
Slow (3 Hz)
1
Medium (20 Hz)
[6]
8
Fast (200 Hz)
10
Fast (200 Hz)
[7]
100
Fast (200 Hz)
[8]
Readings/s
0.14
1
8
100
0.77
[7]
1
2.5
[7]
9
3.2
[7]
70
digits=15 bits
1 2
407
9
Advertisement
Table of Contents
