15
Measurement Characteristics
[8]
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 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 3 Hz, 20 Hz, 200 Hz LF limit
DC Current
Shunt Resistance 5 Ω 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 1A 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 >5kΩ
Thermistor 44004, 44007, 44006 series
RTD = 0.00385 (DIN) and = 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
[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) 490
Thermocouple 0.1°C (1 plc) 49 (47)
(0.02 plc) 280
RTD, Thermistor 0.01°C (10 plc) 6 (5)
0.1°C (1 plc) 47 (47)
1°C (0.02 plc) 280
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 490
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
[10]
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
[10] Assumes relative time format (time since start of scan)
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