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Chapter 9 Specifications
DC Measurement and Operating Characteristics
DC Measurement and Operating Characteristics
DC Measurement Characteristics
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 M or >10 G
100 V, 300 V ranges
10 M
Input Bias Current:
< 30 pA at 25 C
Input Protection:
300 V on all ranges
Resistance
Measurement Method:
Selectable 4-wire or 2-wire Ohms,
Current source reference to LO input
Offset Compensation:
Selectable on 100 , 1 k , 10 k ranges
Max. Lead Resistance:
10% of range per lead for 100 and
1 k ranges. 1 k on all other ranges
Input Protection:
300 V on all ranges
DC Current
Shunt Resistance:
5 for 10 mA, 100 mA; 0.1 for 1A.
Input Protection:
1.5A 250 V fuse on HP 34901A module
Thermocouple
Conversion:
ITS-90 software compensation
Reference Junction Type:
Internal, Fixed, or External
Open T/C Check:
Selectable per channel. Open > 5 k
RTD
= 0.00385 (DIN) and 0.00392
Thermistor
44004, 44007, 44006 series
Measurement Noise Rejection 60 Hz (50 Hz)
DC CMRR:
140 dB
Integration Time
Normal Mode Rejection
200 PLC / 3.33s (4s)
110 dB
100 PLC / 1.67s (2s)
105 dB
20 PLC / 333 ms (400 ms)
100 dB
10 PLC / 167 ms (200 ms)
95 dB
2 PLC / 33.3 ms (40 ms)
90 dB
1 PLC / 16.7 ms (20 ms)
60 dB
< 1 PLC
0 dB
[1]
1%
[2]
[3]
[4]
[4]
[4]
[4]
DC Operating Characteristics
[6]
Function
Digits
Readings/s
DCV, DCI, and
6
0.6 (0.5)
1 2
Resistance:
6
1 2
5
1 2
5
1 2
4
1 2
Single Channel Measurement Rates
Function
Resolution
DCV, 2-Wire Ohms:
6
1 2
(10 PLC)
5
1 2
(1 PLC)
4
1 2
(0.02 PLC)
Thermocouple:
0.1 C (1 PLC)
(0.02 PLC)
RTD, Thermistor:
0.01 C (10 PLC)
0.1 C (1 PLC)
1 C (0.02 PLC)
Autozero OFF Operation
Following instrument warm-up at calibration temperature 1 C
and < 10 minutes, add 0.0002% range additional error + 5 V.
Settling Considerations
Reading settling times are affected by source impedance,
low dielectric absorption characteristics, and input signal changes.
[1] 300 Vdc isolation voltage (ch-ch, ch-earth)
[2] For 1 k unbalance in LO lead
[3] For power line frequency 0.1%
[4] For power line frequency 1%, use 80 dB.
For power line frequency 3%, use 60 dB.
[5] Reading speeds for 60 Hz and (50 Hz) operation; autozero OFF
[6] 6
1 2
digits=22 bits, 5
1 2
digits=18 bits, 4
[7] Add 20 V for DCV, 4 A for DCI, or 20 m for resistance
[8] For fixed function and range, readings to memory,
scaling and alarms off, autozero OFF
[5]
Additional
Noise Error
0% of range
6 (5)
0% of range
60 (50)
0.001% of range
[7]
300
0.001% of range
[7]
600
0.01% of range
[8]
Readings/s
6 (5)
57 (47)
600
57 (47)
220
6 (5)
57 (47)
220
1 2
digits=15 bits
405
9
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