Specifications
3
Measurement Characteristics
[8]
DC Voltage
Measurement Method: Continuously Integrating Multi-slope
IIIA-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
100V, 300V 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 100Ω, 1kΩ, 10kΩ 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 3Hz, 20Hz, 200Hz LF limit
DC Current
Shunt Resistance: 5 Ω for 10 mA, 100 mA; 0.1 Ω for 1 A
Input Protection: 1A 250V fuse on the 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: 1A 250V fuse on the 34901A module
Thermocouple
Conversion: ITS-90 software compensation
Reference Junction Type: Internal, Fixed, or External
Open Thermocouple Check: Selectable per channel. Open >5kΩ
Thermistor 44004, 44007, 44006 series
RTD α = 0.00385 (DIN) and α = 0.00392
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
[9]
Reading/s
dcV, 2-wire Resistance 6
1
/2 digits (10 plc) 6 (5)
5
1
/2 digits (1 plc) 57 (47)
4
1
/2 digits (0.02 plc) 600
Thermocouple 0.1°C (1 plc) 57 (47)
(0.02 plc) 220
RTD, Thermistor 0.01°C (10 plc) 6 (5)
0.1°C (1 plc) 57 (47)
1°C (0.02 plc) 220
acV 6
1
/2 Slow (3 Hz) 0.14
6
1
/2 Med (20 Hz) 1
6
1
/2 Fast (200 Hz) 8
6
1
/2
[6]
100
Frequency, Period 6
1
/2 digits (1s gate) 1
5
1
/2 digits (100 ms) 9
4
1
/2 digits (10 ms) 70
System Speeds
[7]
INTO Memory ch/s
Single Channel dcV 600
34902A Scanning dcV 250
34907A Scanning Digital in 250
34902A Scanning dcV with Scaling & 1 Alarm Fail 220
34907A Scanning Totalize 170
34902A Scanning Temperature 160
34902A Scanning acV
[6]
100
34902A Scanning dcV/Ohms on Alternate Channels 90
34901A/34908A Scanning dcV 60
INTO and OUT of Memory to GPIB or RS-232 (init, fetch)
34902A Scanning dcV 180
34902A Scanning dcV with Timestamp 150
OUT of Memory to GPIB
Readings 800
Readings with Timestamp 450
Readings with All Format Options ON 310
OUT of Memory to RS-232
Readings 600
Readings with Timestamp 320
Readings with All Format Options ON 230
DIRECT to GPIB or RS-232
Single Channel dcV 440
34902A Scanning dcV 200
Single Channel MEAS DCV 10 / MEAS DCV 1 25
Single Channel MEAS DCV/ MEAS OHMS 12
[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 fixed function and range, readings to memory, scaling and alarms off, AZERO
OFF
[6] Maximum limit with default settling delays defeated
[7] Speeds are for 4
1
/2 digits, delay Ø, display off, autozero off. Using 115 kbaud RS-232
setting
[8] Isolation voltage (ch - ch, ch - earth) 300 Vdc, ac rms
[9] 6
1
/2 digits = 22 bits, 5
1
/2 digits = 18 bits, 4
1
/2 digits = 15 bits