Idiomas disponibles
Idiomas disponibles
3 Features and Functions
Alarm limits
The DAQ970A/DAQ973A has four alarm outputs which you can configure to alert you when a reading exceeds
specified 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/DAQ973A 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 frequency, and
environment. The DAQ970A/DAQ973A 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
Multiplexer
Matrix
Form C (single pole, double throw)
The following sections describe each of these switching topologies.
Multiplexer switching
Multiplexers allow you to connect one of multiple channels to a common channel, one at a time. A simple 4-to-1
multiplexer is shown below. When you combine a multiplexer with a measurement device, like the internal DMM,
you create a scanner. For more information on scanning, see
52
Plug-in modules
DAQM900A, DAQM901A, DAQM902A, DAQM905A, DAQM908A
DAQM904A
DAQM903A
Scanning.
Keysight DAQ970A/DAQ973A User's Guide
