18
Multiplexer Selection Guide
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-before-
make 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 clo-
sures at any time.
34901A
20-Channel General-Purpose Multiplexer
• 60 ch/s scanning
• Two- and four-wire scanning
• Built-in thermocouple reference junction
• 300 V switching
The Agilent 34901A is the most versatile multi-
plexer for general purpose scanning. It combines
dense, multifunction switching with 60 channel/
second scan rates to address a broad spectrum
of data acquisition applications.
Two- and four-wire channels can be mixed on
the same module. Two additional fused inputs
(22 channels total) route up to 1A of current to
the internal DMM, allowing ac and dc current
measurements without the need for external
shunt resistors.
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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