User`s guide

327
Chapter 8 Specifications
DC Measurement and Operating Characteristics
4
8
DC Measurement and Operating Characteristics
DC Measurement Characteristics
[1]
DC Voltage
Measurement Method:
A/D Linearity:
Input Resistance:
100 mV, 1V, 10 V ranges
100 V, 300 V ranges
Input Bias Current:
Input Protection:
Continuously Integrating
Multi-slope III A/D Converter
0.0002% of reading + 0.0001% of
range
Selectable 10 M or > 10 G
10 M ±1%
< 30 pA at 25 °C
300 V on all ranges
Resistance
Measurement Method:
Offset compensation:
Max. Lead Resistance:
Input Protection:
Selectable 4-wire or 2-wire Ohms
Current source reference to LO input
Selectable on 100, 1k, 10k
ranges
10% of range per lead for 100  and
1 k ranges. 1 k on all other
ranges
300 V on all ranges
DC Current
Shunt Resistance:
Input Protection:
5  for 10 mA, 100 mA; 0.1  for 1A.
1.5A 250 V fuse on 34901A module
Thermocouple
Conversion:
Reference Junction Type:
Open T/C Check:
ITS-90 software compensation
Internal, Fixed, or External
Selectable per channel. Open > 5 k
RTD  - 0.00385 (DIN/IEC 751) using
ITS-90 software compensation or
 = 0.00391 using IPTS-68 software
compensation.
Thermistor 44004, 44007, 44006 series
Measurement Noise Rejection 60 Hz (50 Hz)
[2]
DC CMRR: 140 dB
Integration Time
200 PLC / 3.33s (4s)
100 PLC / 1.67s (2s)
20 PLC / 333 ms (400 ms)
10 PLC / 167 ms (200 ms)
2 PLC / 33.3 ms (40 ms)
1 PLC / 16.7 ms (20 ms)
< 1PLC
Normal Mode Rejection
[3]
110 dB
[4]
105 dB
[4]
100 dB
[4]
95 dB
[4]
90 dB
60 dB
0 dB
34970A Refresh UG.book Page 327 Wednesday, February 17, 2010 12:34 PM