Y axis unit – Agilent Technologies Signal Analyzer N9030a User Manual

Page 533

6 RLC Swept SA Measurement Front-Panel & SCPI Reference

AMPTD Y Scale

Y Axis Unit

Displays the menu keys that enable you to change the vertical (Y) axis amplitude unit. The
analyzer retains the entered Y Axis Unit separately for both Log and Lin amplitude scale types.
For example, if Scale Type has been set to Log, and you set Y Axis Unit to dBm, pressing Scale
Type (Log) sets the Y Axis Unit to dBm. If Scale Type has been set to Lin and you set Y Axis Unit
to V, pressing Scale Type (Lin) sets the Y Axis Unit to V. Pressing Scale Type (Log) again sets the
Y axis unit back to dBm.

The units of current (A, dBmA, dBuA) are calculated based on 50 ohms input impedance.

All four of the EMI units (dBµA/m, dBµV/m, dBG, dBpT) are treated by the instrument exactly as though
they were dBuV. The user must load an appropriate correction factor using Amplitude Corrections for
accurate and meaningful results.

If a SCPI command is sent to the analyzer that uses one of the EMI units as a terminator, the analyzer
treats it as though DBUV had been sent as the terminator.

Key Path

AMPTD Y Scale

Mode

Scope

Meas Global

Remote Command

:UNIT:POWer?

Example

UNIT:POW dBmV

UNIT:POW?

Notes

The Y axis unit has either logarithmic or linear characteristics. The set of units that is
logarithmic consists of dBm, dBmV, dBmA, dBµV, dBµA, dBµV/m, dBµA/m, dBpT, and dBG. The
set of units that are linear consists of V, W, and A. The chosen unit will determine how the
reference level and all the amplitude-related outputs like trace data, marker data, etc. read out.

Notes

The settings of Y Axis Unit and Scale Type, affect how the data is read over the remote interface.
When using the remote interface no unit is returned, so you must know what the Y axis unit is
to interpret the results:

Example 1, set the following:

Scale Type (Log)

Y Axis Unit, dBm

Scale/Div, 1 dB

Ref Level, 10 dBm

This sets the top line to 10 dBm with each vertical division representing 1 dB. Thus, if a point on

Remote Language Compatibility Measurement Application Reference

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