Keysight DAQ970A User Guide

Module number Common uses
DAQM900A N/A
DAQM901A Multiplexing of signals to or from external instruments.
DAQM902A N/A
DAQM904A 32 Crosspoint Matrix Switching.
DAQM905A 50 Ω high-frequency applications (<2 GHz).
DAQM908A N/A
Control output
DAQM903A General-purpose switching and control using Form C (SPDT) switches.
DAQM907A Digital Output, Voltage (DAC) Outputs.
System cabling
The plug-in modules have screw-terminal connectors to make it easy to connect your system cabling. The
type of cabling that you use to connect your signals, transducers, and sensors to the module is critical to
measurement success. Some types of transducers, such as thermocouples, have very specific requirements
for the type of cable that can be used to make connections. Be sure to consider the usage environment
when choosing wire gauge and insulation qualities. Wire insulation typically consists of materials such as
PVC or PTFE. Table below lists several common cable types and describes their typical uses.
Wiring insulation and usage is described in more detail in "System Cabling and Con-
nections".
Cable type Common uses Comments
Thermocouple Extension Wire Thermocouple measurements. Available in specific thermocouple types. Also avail-
able in shielded cable for added noise immunity.
Twisted Pair, Shielded Twisted
Pair
Measurement inputs, voltage outputs,
switching, counting.
Most common cable for low-frequency measurement
inputs. Twisted pair reduces common mode noise.
Shielded-twisted pair provides additional noise
immunity.
Shielded Coaxial, Double-Shiel-
ded Coaxial
VHF signal switching. Most common cable for high-frequency signal rout-
ing. Available in specific impedance values (50 Ω or
75 Ω). Provides excellent noise immunity. Double-
shielded cable improves isolation between channels.
Requires special connectors.
Flat Ribbon, Twisted pair Rib-
bon
Digital Input/Output Often used with mass termination connectors. These
cables provide little noise immunity.
Transducers and sensors
Transducers and sensors convert a physical quantity into an electrical quantity. The electrical quantity is
measured and the result is then converted to engineering units. For example, when measuring a ther-
mocouple, the instrument measures a DC voltage and mathematically converts it to a corresponding tem-
perature in °C, °F, or K.
Keysight DAQ970A User's Guide 55
3 Features and Functions

Keysight DAQ970A Specifications

General

Scan Rate	Up to 450 channels/sec
Connectivity	USB, LAN, GPIB (optional)
Display	4.3-inch color LCD
Operating Temperature	0 °C to 50 °C
Number of slots	3 slots
Measurement Types	DCV, ACV, DCI, ACI, 2-wire resistance, 4-wire resistance, frequency, temperature, capacitance
Voltmeter	6.5 digit
Resolution	22 bits
Memory	Non-volatile memory