Measurement Typical transducer types Typical transducer output
Temperature Thermocouple 0 mV to 80 mV
RTD 2-wire or 4-wire resistance from 5 Ω to 500 Ω
Thermistor 2-wire resistance from 10 Ω to 1MΩ
Pressure Solid State ±10 DVC
Flow Rotary Type
Thermal Type
4 mA to 20 mA
Strain Resistive Elements 4-wire resistance from 10 Ω to 10 kΩ
Events Limit Switches
Optical Counters
Rotary Encoder
0 V or 5 V Pulse Train
Digital System Status TTL-compatible Levels
Alarm limits
The DAQ970A has four alarm outputs which you can configure to alert you when a reading exceeds spe-
cified limits on a channel during a scan. You can assign a high limit, low limit, or both to any configured
channel in the scan list. You can assign multiple channels to any of the four available alarms (numbered 1
through 4). For example, you can configure the instrument to generate an alarm on Alarm 1 when a limit is
exceeded on any of the channels 103, 205, or 320.
You can also assign alarms to channels on the multifunction module. For example, generate an alarm when
a specific bit pattern or bit pattern change is detected on a digital input channel or when a specific count is
reached on a totalizer channel. With the multifunction module, the channels do not have to be part of the
scan list to generate an alarm.
Signal Routing and Switching
The switching capabilities of the plug-in modules available with the DAQ970A provide test system flexibility
and expandability. You can use the switching plug-in modules to route signals to and from your test system
or multiplex signals to the internal DMM or external instruments.
Relays are electromechanical devices which are subject to wear-out failure modes. The life of a relay, or the
number of actual operations before failure, is dependent upon how it is used - applied load, switching fre-
quency, and environment. The DAQ970A relay maintenance system automatically counts the cycles of each
relay in the instrument and stores the total count in non-volatile memory on each switch module. Use this
feature to track relay failures and to predict system maintenance requirements.
Switching topologies
Several switching plug-in modules are available with different topologies for various applications:
Switching topologies Plug-in modules
Multiplexer DAQM900A, DAQM901A, DAQM902A, DAQM905A, DAQM908A
Matrix DAQM904A
Form C (single pole, double throw) DAQM903A
The following sections describe each of these switching topologies.
3 Features and Functions
56 Keysight DAQ970A User's Guide
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