Atec Agilent-34972A - Manual (Page 17)

17
Measurement characteristics [7]
DC voltage
Measurement Method
Continuously Integrating
Multi-slope III A-D converter
A/D linearity 0.0002% of reading + 0.0001 % of range
Input resistance
100 mV, 1 V, 10 V ranges Selectable 10 MΩ or > 10,000 MΩ
100 V, 300 V ranges
10 MΩ ± 1%
Input bias current < 30 pA at 25 °C
Input protection 300 V all ranges
True RMS AC voltage
Measurement method
AC coupled True RMS — measures the
AC component of the input with up to
300 Vdc of bias on any range
Crest factor Maximum of 5:1 at Full Scale
Additional crest factor
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
Input impedance 1 MΩ ± 2% in parallel with 150 pF
Input protection 300 Vrms all ranges
Resistance
Measurement method
Selectable 4-wire or 2-wire Ohms
Current source referenced to LO input
Offset compensation Selectable on 100 Ω, 1 kΩ, 10 kΩ ranges
Maximum lead resistance 10% of range per lead for 100 Ω and
1 kΩ ranges. 1 kΩ on all other ranges
Input Protection 300 V 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
DC Current
Shunt resistance
5Ω for 10 mA, 100 mA; 0.1 Ω for 1 A
Input protection 1A 250 V fuse on 34901A module
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 Ω for 10 mA; 0.1 Ω for 100 mA, 1 A
Input protection 1 A 250 V fuse on 34901A module
Thermocouple
Conversion ITS-90
software compensation
Reference junction type Internal, Fixed, or External
Open thermocouple check Selectable per channel. Open > 5 kΩ
Thermistor 44004, 44007, 44006 series
RTD α = 0.00385 (DIN) and α = 0.00391
Measurement noise rejection 60 (50) Hz [1]
dc CMRR 140 dB
ac CMRR 70 dB
Integration time Normal mode rejection [2]
200 plc/3.33s (4s) 110 dB [3]
100 plc/1.67s (2s) 105 dB [3]
20 plc/333 ms (400 ms) 100 dB [3]
10 plc/167 ms (200 ms) 95 dB [3]
2 plc/33.3 ms (40 ms) 90 dB
1 plc/16.7 ms (20 ms) 60 dB
< 1 plc 0 dB
Operating characteristics [4]
Single channel measurement rates [5]
Function Resolution [8] 34970A/34972A
readings/sec
dcV, 2-wire resistance 6½ digits (10 plc) 6 (5)
5½ digits (1 plc) 54 (47)
4½ digits (0.02 plc) 500
Thermocouple 0.1 °C (10 plc) 6 (5)
0.1 °C (1 plc) 52 (47)
(0.02 plc) 280
RTD, thermistor 0.01 °C (10 plc) 6 (5)
0.1 °C (1 plc) 49 (47)
1 °C (0.02 plc) 200
acV 6½ Slow (3 Hz) 0.14
6½ Med (20 Hz) 1
6½ Fast (200 Hz) 8
6½ [6] 100
Frequency, period 6½ digits (1 s gate) 1
5½ digits (100 ms) 9
4½ digits (10 ms) 70
[1] For 1 KΩ unbalance in LO lead
[2] For power line frequency ± 0.1%
[3] For power line frequency ± 1% use 80 dB or ± 3% use 60 dB
[4] Reading speeds for 60 Hz and (50 Hz) operation
[5] For fi xed function and range, readings to memory, scaling and
alarms off, AZERO OFF, USB datalogging OFF
[6] Maximum limit with de fault settling delays defeated
[7] Isolation voltage (ch-ch, ch-earth) 300 Vdc, ac rms
[8] 6½ digits = 22 bits, 5½ digits = 18 bits, 4½ digits = 15 bits