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Multiplexer selection guide
Choose between the broad functionality of the DAQM901A,
the high speed scanning of the DAQM902A, or the DAQM900A
solid-state module, and the single-ended density of the
DAQM908A. These four modules are the only way to connect
to the DAQ970A 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.
DAQM900A 20-Channel FET multiplexer module
20-Channel General Purpose Multiplexer
– 450 ch/s scanning
– Two- and four-wire scanning
– Built-in thermocouple reference junction
– 120 V switching
The DAQM900A module is divided into two banks of 10 two-wire
channels each. All 20 channels switch both HI and LO inputs, thus
providing fully isolated inputs to the internal DMM or an external
instrument. During 4-wire resistance measurements, channels
from Bank A are automatically paired with channels from Bank B
to provide the source and sense connections. The module has a
built-in thermocouple reference junction to minimize errors due to
thermal gradients when measuring thermocouples.
DAQM900A DAQM901A DAQM902A DAQM908A
Number of channels 20 20 + 2 16 40
Max scan speed 450 ch/s 80 ch/s 250 ch/s 100 ch/s
Number of contacts 2 or 4 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
●
capacitance
● ● ●
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