Specifications

88 Chapter 10
Using External Millimeter Mixers (Option AYZ)
Frequency Tracking Calibration with Agilent 11974 Series Preselected
Harmonic Mixers
Using External Millimeter Mixers
(Option AYZ)
Frequency Tracking Calibration with Agilent
11974 Series Preselected Harmonic Mixers
This procedure is used to align the frequency of the preselector filter of
the Agilent 11974 to the tuned frequency of the analyzer. This
procedure should be followed any time that the Agilent 11974 is
connected to a different analyzer. The calibration should be periodically
checked.
Step 1. Connect the signal source and preselected mixer to the analyzer as
shown in Figure 10-3.
Step 2. Set the Agilent 11974 rear-panel switches “Agilent 70907B” and
“LEDS” to the ON position, and the other two switches to the OFF
position, in order for the Agilent 11974 to properly scale to the tune
signal of the analyzer.
Step 3. Configure the analyzer for a preselected external mixer:
Press
Preset, Factory Preset (if present).
Press
Input/Output, Input Mixer, Input Mixer (Ext), Mixer Config, Mixer Type
(Presel).
Step 4. Set the desired frequency band of operation for your mixer:
Press
Input/Output, Input Mixer, Ext Mix Band, then select external mixing
band (bands A, Q, U or V).
Step 5. Set the preselector adjustment to 0 MHz:
Press
AMPLITUDE Y Scale, Presel Adjust, 0, MHz.
Step 6. Set the analyzer to zero span:
Press
SPAN X Scale, Zero Span.
Step 7. Set the center frequency to the value in Table 10-1 for your mixer:
Press
FREQUENCY Channel, Center Freq, frequency value.
On the rear panel of the Agilent 11974, adjust the corresponding
potentiometer until one or both of the green LEDs are lit.
Table 10-1 Start Frequency Preselector Adjustment
Mixer
Agilent P/N
Analyzer Center
Frequency
Potentiometer
11974A 26.5 GHz “26.5 GHz Adjust”
11974Q 33.0 GHz “33.0 GHz Adjust”
11974U 40.0 GHz “40.0 GHz Adjust”