Product specifications

21
The math functions in the N934xC HSA are true power
calculations, meaning that the measurements are
converted to power, the math function is performed, and
the results are displayed in dBm.
In this demonstration, we will subtract -6 dBm from 0 dBm
and the result will be -1.2 dBm. In order to get the correct
results, the source should be adjusted to as close to the
required power as possible as shown by the analyzer
marker:
• 0 dBm = 1 mw
• -6 dBm = 0.25 mw
• -1.2 dBm = 0.75 mw
Demonstration 12
Trace math functions
Instructions for the
source
Keystrokes for the
source
Generate a 1 GHz, 0 dBm CW
signal
[Preset], [Freq], [1], {GHz},
[Amptd], [0], {dBm},
[Mod Off], [RF On]
Adjust the power of the signal
to -6 dBm on the HSA
[Amptd], [-6], {dBm}
Adjust the knob so that the
marker on the analyzer reads
-6 dBm
Instructions for HSA Keystrokes for HSA
Set the center frequency [Freq], {Center Freq}, [1],
{GHz}
Set zero span [Span], {Zero Span}
Set reference level and scale [Amptd], [4], {dBm}, {Scale/
Div}, [2], {dB}, if needed,
adjust amplitude on the ESG
so that the signal on the HSA
reads 0 dBm
Place trace 1 in view mode
and trace 2 in clear write
mode
[Trace], {View}, {Trace (2)},
{Clear Write}
Place marker 1 on trace 2 [Marker], {Marker Trace},
{Trace2}
Adjust the power of the signal
to -6 dBm on the HSA
[Amptd], [-6], {dBm}
Adjust the knob so that the
marker on the analyzer reads
-6 dBm
Subtract trace 2 from trace 1
and place the result on trace 3
[Trace], {More 1 of 2}, {Trace
Math}, {Math By (Pwr)},
{Math Type}, {A-B->C}
Move the marker to trace 3
and read the results
[Marker], {Marker Trace},
{Trace3}
The marker will read
approximately -1.2 dBm. To
see the difference between
rms power difference and
log difference, go to [Trace],
{More 1 of 2}, {Trace Math},
{Math By (Log Pwr}