Specifications

Measurement Characteristics
(Continued)
Frequency and Period Measurement Method Reciprocal counting technique
Voltage Ranges Same as AC voltage function
Gate Time 1 s, 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 1 A 250 V fuse on 34921A module
True RMS AC Current Measurement Method Direct coupled to the fuse and shunt,
AC coupled True RMS measurement
(measures the AC component ony)
Shunt Resistance 5 Ω for 10 mA; 0.1 Ω for 100 mA, 1 A
Input Protection 1 A 250 V fuse on 34921A 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 = 0.00385 (DIN) and = 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/3.33 s (4 s) 105 dB
3
100 plc/1.67 s (2 s) 100 dB
3
20 plc/333 ms (400 ms) 95 dB
3
10 plc/167 ms (200 ms) 90 dB
2 plc/33.3 ms (40 ms) 85 dB
1 plc/16.7 ms (20 ms) 60 dB
<1 plc 0 dB
1
For 1 KΩ unbalance in LO lead
2
For power line frequency ±0.08%
3
For power line frequency ±1% use 75 dB or ±2.5% 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, autozero off
6
Maximum limit with default settling delays defeated
7
Speeds are for 4
1
/
2
digits, delay Ø, display off, autozero off
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)
154
Multifunction Switch/Measure
Mainframe and Modules 34980A (Continued)
More detailed specifications at www.agilent.com/find/34980A
Data Acquisition & Switching
Scanning Inputs Analog 34921A -34922A, 34923A, 34924A, and
34925A multiplexer channels
Digital 34950A/52A digital in and totalize
Scan Triggering Source Interval, external, button press, software,
or on monitor channel alarm
Scan count 1 to 50,000 or continuous
Scan interval 0 to 99 hours; 1 ms step size
Channel delay 0 to 60 seconds per channel; 1 ms step size
External trig delay <2 ms, With monitor on <200 ms
External trig jitter <2 ms
System Characteristics
1
Storage at temperature above 40°C will decrease battery life
2
Load IO libraries version M for Windows NT Support
Microsoft, Windows, and Windows NT are U.S. registered trademarks of Microsoft Corporation.