Datasheet

Page 19
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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 the single-ended density of the DAQ908A.
These four modules are the only way to connect to the DAQ970A
internal DMM. They can be used to scan with external instru-
ments 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.
DAQM901A DAQM901A DAQM902A DAQM908A
Number of channels 20 + 2 20 + 2 16 40
Max scan speed 80 ch/s 80 ch/s 250 ch/s 80 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
●