When M937xA, P937xA, and M9485A work with M9341B Anlog/Digital I/O, you can measure or output DC signal.
Analog Inputs (AI1 to AI4) can be used for measuring from -10V to +10V. These inputs can be considered auxiliary measurement receivers and used in a similar way as S-Parameter receivers.
Analog Output (AOC1 and AOC2) can be used to monitor the current of corresponding DC output..
Note: When analog inputs are measured along with analog output, the input measurement may have some transient noise if output voltage is changed significantly. The timing and level of transient noise will be varied depending on the load of device for analog output. Extending dwell time and sampling period can reduce the influence of noise.
New Trace (ADC) dialog box help |
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On the New Trace dialog, click the Receivers tab. Activate - check any empty line to create a trace. Numerator - select from the following:
Denominator - NOT available (ONLY unratioed measurements) Source Port - The ADC receiver is measured when the specified source port is sweeping. Select None to always measure the ADC receiver. |
This tab is displayed only when the M9341B is installed. Note (M9485A): The M9341B should be placed at next slot of the most right receiver (M9376A/77A). For the M9377A, the M9378A/B can be placed between M9341B and M9377A. Otherwise, the measurement speed becomes slow. When you make a pulsed measurement (Option 025), it must be placed at next slot of the most right receiver.
Range : Select from 1, 5 or 10 V. Smaller range has better resolution. Measurement Time : DC measurement time for one point. This can calculated by (Number of Samples) x 20 nsec. Number of Samples : Number of ADC samples for one point. One ADC sample takes 20 nsec. Increasing this number improve the stability of DC measurement. |
ADC receiver traces are labeled as shown in the following images:
The ADC1 input is being measured, with 2 as the source port.
The Y axis is U (unitless).
The default trace format is Real (linear).
Although most VNA functions work with ADC traces, the following may be especially useful.
Equation Editor can be used with the trace data. Although the VNA ADC is measuring voltage , by using a trace formula, this voltage can represent other types of measurement parameters (such as current, temperature, or a scaled voltage). See PAE example.
Trace averaging and Trace Smoothing can be used to remove trace noise.
Dwell time can be used to allow for settling.
Calibration for ADC receivers is NOT supported.
Not supported in Noise Figure application
