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333
Chapter 8 Specifications
Module Specifications
4
8
Module Specifications
34901A, 34902A, 34908A, 34903A, 34904A
[1] See scanning rate specifications for measurement conditions and rates on each instrument.
[2] Errors included in the DMM measurement accuracy specifications
[3] 50  source, 50  load
[4] Isolation within channel 1 to 20 or 21 to 40 banks is -40 dB
[5] Thermocouple specifications not guaranteed when 34907A module is present
[6] Applies to resistive loads only
[7] Thermocouple measurements not recommended with 34908A module due to common LO configuration.
Multiplexer Actuator Matrix
General 34901A 34902A 34908A 34903A 34904A
Number of Channels 20+2 16 40 20 4x8
2/4 wire 2/4 wire 1 wire SPDT 2 wire
Connects to Internal DMM Yes Yes Yes No No
Scanning Speed
[1]
60 ch/s 250 ch/s 60 ch/s
Open/Close Speed 120/s 120/s 70/s 120/s 120/s
Maximum Input
Voltage (dc, AC rms) 300 V 300 V 300 V 300 V 300 V
Current (dc, AC rms) 1 A 50 mA 1 A 1 A 1 A
Power (W, VA) 50 W 2 W 50W 50W 50W
Isolation (ch-ch, ch-earth) dc, AC rms 300 V 300 V 300 V 300 V 300 V
DC Characteristics
Offset Voltage
[2]
< 3  V <6  V < 3  V < 3  V < 3  V
Initial Closed Channel R
[2]
< 1  < 1  < 1  < 0.2  < 1 
Isolation (ch-ch, ch-earth) > 10 G  > 10 G  > 10 G  > 10 G  > 10 G 
AC Characteristics
Bandwidth 10 MHz 10 MHz 10 MHz 10 MHz 10 MHz
Ch-Ch Cross Talk (dB)
[3]
10 MHz -45 -45 -18
[4]
-45 -33
Capacitance HI to LO < 50 pF < 50 pF < 50 pF < 10 pF < 50 pF
Capacitance LO to Earth < 80 pF < 80 pF < 80 pF < 80 pF < 80 pF
Volt-Hertz Limit 10
8
10
8
10
8
10
8
10
8
Other
T/C cold Junction Accuracy
[2] [5]
(typical) 0.8 °C 0.8 °C 0.8 °C
[7]
Switch Life No Load (typical) 100M 100M 100M 100M 100M
Switch Life Rated Load (typical)
[6]
100k 100k 100k 100k 100k
Temperature Operating All Modules: 0 °C to 55 °C
Temperature Storage All Modules: -20 °C to 70 °C
Humidity (non-condensing) All Modules: 40 °C / 80% R.H.
34970A Refresh UG.book Page 333 Wednesday, February 17, 2010 12:34 PM