Ac Measurement And Operating Characteristics - Agilent Technologies 34901A User Manual

Chapter 9 Specifications

AC Measurement and Operating Characteristics

AC Measurement and Operating Characteristics

AC Measurement Characteristics
True RMS AC Voltage
AC-coupled True RMS – measures
Measurement Method:
the ac component of input with up
to 300 Vdc of bias on any range
Maximum 5:1 at Full Scale
Crest Factor:
Additional Crest Factor
[2]
Crest Factor 1-2: 0.05% of reading
Errors (non-sinewave):
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:
3 Hz – 300 kHz
Slow
20 Hz – 300 kHz
Medium
Fast 200 Hz – 300 kHz
Ω ±
Input Impedance: 1 M
300 Vrms on all ranges
Input Protection:
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)
Ω
Shunt Resistance: 5 for 10 mA; 0.1
Input Protection: 1.5A 250 V fuse on 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.
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[1]
AC Operating Characteristics
Function
ACV, ACI:
Single Channel Measurement Rates
Function
ACV:
2%, in parallel with 150 pF
Frequency, Period:
[1] 300 Vrms isolation voltage (ch-ch, ch-earth)
[2] For frequencies below 100 Hz, slow AC filter specified for
[3] For 1 k
[4] Maximum reading rates for 0.01% of ac step additional error.
[5] 6
Ω
for 100 mA, 1A
[6] For external trigger or remote operation using default
[7] Maximum limit with default settling delays defeated
[8] For fixed function and range, readings to memory,
[5]
Digits Readings/s
⁄
6 7 sec/reading
1
2
6 ⁄
1
2
6 ⁄
1
2
⁄
6 1 10
2
1
6 100
/2
Resolution
⁄
6 1 Slow (3 Hz)
2
6 ⁄ Medium (20 Hz)
1
2
6 ⁄ Fast (200 Hz)
1
2
1 [7]
6
/2
6
⁄
1 Digits (1s gate)
2
⁄
5 1 Digits (100 ms)
2
4
⁄ Digits (10 ms)
1
2
sinewave input only
Ω
unbalance in LO lead
Additional settling delay required when input dc level varies.
⁄ ⁄
1 digits=22 bits, 5 1 digits=18 bits, 4
2 2
settling delay (Delay Auto)
scaling and alarms turned off
[4]
AC Filter
Slow (3 Hz)
1 Medium (20 Hz)
[6]
8 Fast (200 Hz)
Fast (200 Hz)
[7]
Fast (200 Hz)
[8]
Readings/s
0.14
1
8
100
1
9
70
⁄
1 digits=15 bits
2
407
9