Agilent Technologies 54503A Podręcznik Użytkownika Pobierz pdf (Strona 106)

100

101

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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