23 | Keysight | N9342C/N9343C/N9344C HSA Handheld Spectrum Analyzer - Demonstration Guide
In many cases, stimulus response characteristic measurements are important. A
spectrum analyzer equipped with a tracking generator forms a stimulus response
measurement system that can easily perform scalar component test with high dynamic
range (due to the spectrum analyzer’s tuned receiver architecture and narrow IF
bandwidths). The Keysight N924xC HSAs each have an optional high-performance,
built-in tracking generator (Option TG7) (frequency range from 5 MHz to 7 GHz). With
this option, the HSA performs stimulus response measurements.
In this demonstration, we’ll measure the passband and rejection of a bandpass filter.
Demonstration 13
Tracking generator
Instructions for HSA
Keystrokes for HSA
Preset the HSA
[Preset]
Turn on the tracking generator and set its output amplitude to -10 dBm
[Mode], {Track Generator}, {Amplitude, (On)}, [-10], {dBm}
Set start frequency and stop frequency
Note: Select frequencies appropriate for the device being tested
[Freq], {Start Freq}, [852.5], {MHz}, [Stop Freq], [952.5], {MHz}
Note: Decrease the resolution bandwidths to increase dynamic range
To measure the test system’s frequency response more accuracy, directly
connect the cable from the tracking generator output to the analyzer RF
input
The normalization function is used to eliminate the test system’s frequen-
cy response error from the measurements. Store the frequency response
of the test system in trace 4 and make the Normalize On
[Meas], {Normalize}, {Store Ref 1->4}, {Normalize (On)}
Connect the DUT to the analyzer
Change the normalized reference position to optimize the view range
(Figure 25)
{Norm Ref Posn}, [9], {Enter}
Measure the rejection of the filter 20 MHz above to the center frequency
[Marker], [902.5], {MHz}, {Mode}, {Delta}, [20], {MHz}
Figure 25. Stimulus response measurements
DUT