Chapter 2 39
Quick Start: Learning How to Make Measurements
Learning to Make Transmission Measurements
5. Press WIDTH VALUE and enter −, 6, x1.
The analyzer now calculates the bandwidth between −6 dB power levels.
6. Press
Marker, all OFF when you are finished with this measurement.
Measuring Out-of-Band Rejection.
Figure 2-6 Example Measurement of Out-of-Band Rejection
1. Press
MARKER 1. The marker appears where you placed it during the bandwidth
measurement.
2. Press MKR ZERO, Marker Fctn, MKR SEARCH, SEARCH: MIN.
The marker automatically searches for the minimum point on the trace. The frequency
and amplitude of this point, relative to the delta symbol in the center of the filter
passband, appear in the upper-right corner of the display. This value is the difference
between the maximum power in the passband and the power in the rejection band, that
is, one of the peaks in the rejection band.
NOTE You can use the marker search mode to search the trace for the
maximum point or for any target value. The target value can be an
absolute level (for example, −3 dBm) or a level relative to the location of
the small delta symbol (for example: −3 dB from the center of the
passband).
3. If your measurement needs some noise reduction, you could reduce the IF bandwidth or
add averaging.
■ To reduce the IF bandwidth, press
Avg, IF BW, ⇓.
■ To add averaging, press
Avg, AVERAGING ON.
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