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Agilent Actuator / Multiplexer Selection Guides

Agilent Modules-at-a-Glance Selection Guide
Model
description		 Type Speed
(ch/sec)		 Max Volts Max Amps Bandwidth Thermal Offset Comments
34901A
20 ch Multiplexer 		2-wire armature
(4-wire selectable)		 60 300V 1A 10MHz < 3 µV Built-in cold junction reference
2 additional current channels (22 total)
34902A
16 ch Multiplexer 		2-wire reed
(4-wire selectable) 		250 300V 50 mA 10MHz < 6 µV Built-in cold junction reference
34903A
20 ch Actuator/GP Switch		 SPDT/form C 120 300V 1A 10MHz < 3 µV  
34904A
4 x 8 Matrix		 2-wire armature 120 300V 1A 10MHz < 3 µV  
34905A
Dual 4 ch RF Mux 50Ω 		Common Low
(unterminated)		 60 42V 0.7A 2GHz < 6 µV 1 GHz bandwidth through
34906A
Dual 4 ch RF Mux 75Ω 		Common Low
(unterminated) 		60 42V 0.7A 2GHz < 6 µV 1 GHz bandwidth through BNC-to-SMB adapter cable
34907A
Multifunction Module		 Two 8-bit digital I/O ports
26-bit Event Counter
Two 16-bit Analog outputs		 42V
42V
±12V		   400 mA

10 mA
100KHz
dc		   Open drain
Selectable input threshold
Max 40 mA total output per frame
34908A
40 ch Single-Ended Mux 		1-wire armature
(common low) 		60 300V 1A 10 MHz < 3 µV Built-in cold junction reference
No four-wire measurements 19

Choose between the broad functionality of the 34901A, the high speed scanning of the 34902A, or the single-ended density of the 34908A. These three modules are the only way to connect to the 34970A internal DMM. They can be used to scan with external instruments as well.

All multiplexer modules employ break-beforemake scanning, ensuring only one closed channel (or channel pair) at a time. Multiple channel closures are allowed on the 34901A and 34902A modules when not configured for scanning.

The 34908A does not allow multiple channel closures at any time.

Multiplexer Selection Guide
  34901A 34902A 34908A
Number of Channels 20 + 2 16 40
Max scan speed 60 ch/s 250 ch/s 60 ch/s
Number of contacts 2 or 4 2 or 4 1
Temperature
Thermocouple • • •
     2-wire RTD • • •
     4-wire RTD • •  
     Thermistor • • •
dc Volts • • •
ac Volts • • •
2-wire Ohms • • •
4-wire Ohms • •  
Frequency • • •
Period • • •
dc current •    
ac current •    
X