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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	•

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