106 Chapter2
Making Measurements
Example 8: External Millimeter Mixers (Unpreselected)
Figure 2-51 SIG ID AT MKR Performed on a True Signal
Bias
The Agilent 11970A Series harmonic mixers mentioned in the previous
section do not require bias. Mixers requiring bias can also be used with
the 8560 E-Series and EC-Series. Bias minimizes the conversion loss of
these mixers; however, the bias must be adjusted for every frequency
where a measurement is made. Mixers requiring bias are connected as
shown in Figure 2-44 (with mixer bias supplied via the IF line).
To measure a signal, access a band as described above.
To activate the bias:
1. Press
AUX CTRL, EXTERNAL MIXER, BIAS.
2. Press the softkey corresponding to the bias polarity (positive or
negative) that your mixer requires.
3. Use the knob on the spectrum analyzer to adjust the bias and to
peak the signal for maximum amplitude.
4. If your spectrum analyzer has Option 008 or a firmware revision
≤920528, activate the signal identification method that you desire.
5. On most mixers, the optimum bias varies with frequency, so the bias
should be adjusted for every signal measured.
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