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Measuring Spurious Signals
The HP E4915A/E4916A searches through the spurious response in
the specified frequency range and displays the frequency of the
spurious signal and impedance at that frequency.
To measure spurious signals, you need to specify the frequency range
in which to search for spurious signals. The HP E4915A/E4916A
displays the frequency of the specified signal in the selected range
and the ratio between the Cl at Fr and that at the spurious signal
frequency. This spurious ratio indicates the ratio between the
measured impedance at the spurious signal frequency and the Cl at Fr
in dB (201og{(Z value at the spurious frequency)/(CI value)}).
You can choose the desired spurious signal either by specifying
the signal number starting from the lowest frequency signal or by
selecting the signal with the highest peak.
Procedure
We assume that you perform spurious signal measurement after the
crystal resonator characteristics measurement with the Pi-network
test fixture, described in the previous section.
Specifying Spurious Signal Search Range, lb specify the frequency
range in which to search for spurious signals, enter the center
frequency of the desired range and the deviation (ppm) from this
center frequency.
1. Sequentially press
((blue))
and
(Level (Spurious))
to select the spurious
signal mode.
2- Press CEBITrnn.nnnnMHz . (nn.nmm shows the currently selected
value.)
3. Enter the center frequency of the desired frequency range.
4. Press RNG :nnnnn ppm. (minim shows the currently selected
value.)
5. Specify the desired frequency range by entering the deviation from
the center frequency in ppm.
Specifying Number of Spurious Signals and Selecting Target
Signal.
1. Sequentially press f^TD and ifs|s|,:n4 to display the following.
(At this time, nn shows the current setting.)
Nth Worst
2. Select Worst to display information on the spurious signal with the
highest peak or Nth to display information on the nth signal from
the lowest frequency signal.
3. When you select Nth, enter the number of the spurious signal
you wish to search for. To do this, press
§jg
and enter the signal
number.
Applications
5-7
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