Keysight N9020B - Page 1764

3 Spectrum Analyzer Mode
3.10 TOI Measurement
Unit Example Notes
(Transducer
Unit)
DBG to one Gauss). This selection is only available if a Correction is turned on, and the
Transducer Unit for that Correction is not None
See "Transducer Unit" on page 1765
dBmA
(Transducer
Unit)
:UNIT:POW
DBUA
Sets the amplitude unit for the selected amplitude scale (log/lin) to dBmA. This
selection is only available as a Transducer Unit if a Correction is turned on, and the
Transducer Unit for that Correction is not None
See "Transducer Unit" on page 1765
The unit dBuA can also appear as a normal Y Axis Unit (see above)
dBuA as a Transducer Unit is used when using current probes, because current
probes are often supplied with conversion tables that provide the transducer
factors. When dBuA is used as a Transducer Unit, the normal conversion from
power to amps for dBuA (based on the instrument input impedance) is not done,
but instead the conversion is based solely on the Correction that contains the
transducer factors. This is what distinguishes dBuA as a normal unit from dBuA as a
transducer unit
When querying the Y-Axis unit, you can query the Transducer Unit to distinguish
between regular dBuA and the dBuA Transducer Unit. If :CORR:CSET:ANT?
returns NOC (for No Conversion), you are using a normal Y-Axis dBuA. If it returns
UA, you are using a Transducer Unit dBuA
Amplitude Data Query and Y Axis Unit
The settings of Y-Axis Unit and Display Scale affect how the data is returned over
the remote interface in response to a query. 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:
–
Display Scale (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 trace 1 is on the fifth graticule line from the top, it represents 5dBm and
will read out remotely as 5.
Example 2
Set the following:
1764 Spectrum Analyzer Mode User's &Programmer's Reference