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4 Measurement Tutorials
Some digitizers have a built-in anti-aliasing low-pass filter with a sharp cutoff at a frequency equal to l/2 the
digitizer's sampling rate. This limits the bandwidth of the input signal so that aliasing cannot occur. Since the
multimeter has a variable sample rate for DCV digitizing, and to preserve the upper bandwidth for high-frequency
measurements, no anti-aliasing filter is provided in the multimeter. If you are concerned about aliasing, you should
add an external anti-aliasing filter.
Level triggering
When digitizing, it is important to begin sampling at some defined point on the input signal such as when the signal
crosses zero volts or when it reaches the midpoint of its positive or negative peak amplitude. Level triggering allows
you to specify when (with respect to voltage and slope) to begin sampling. Refer to
information.
About DMM Digitize mode
– DMM Digitize mode is available for both DAQ970A/DAQ973A.
– DMM Digitize allows you to take samples of the input signal, at a specified Sample Rate (for example, 50 kHz) or
Sample Interval (for example, 20 μS). You can specify the Duration as either an amount of Time or a number of
Readings (samples). You can use either auto, external, or level triggering. After pressing [Home], press Acquire
> DMM Digitize. You can then select the digitizing/triggering parameters. After configuring the digitizing
parameters, press [Scan/Start]. Digitizing will begin when the specified trigger event occurs.
– The DMM Digitize option enables pretriggering, level triggering, and trigger delay capability.
– For pretrigger, if a trigger comes before all pretriggers are received, trigger is executed to begin readings.
– All samples taken during digitizing are saved in volatile memory. After completing a digitize operation, press
[Save Recall] > Save > Readings softkey and specify a file to save the digitized readings to a file.
– The maximum number of readings that can be captured is based on volatile memory space available.
– Reading stored is cleared at the start of a new acquisition.
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Level triggering
Keysight DAQ970A/DAQ973A User's Guide
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