Agilent Technologies HP 70910A Uživatelská příručka stáhnout pdf (Strana 81)

Chapter 3 81

Operation

Using an E4407B Spectrum Analyzer or 7405A EMC Analyzer

Operation

Frequency Tracking Calibration 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.

1. Set the Agilent 11974 rear-panel switches “ESA/PSA/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.

2. Configure the analyzer for a preselected external mixer by pressing the following keys:

Preset, Factory Preset (if present), Input/Output, Input Mixer (Ext), Mixer Config, Mixer Type

(Presel)

3. Set the desired band of operation. Press

Return, Ext Mix Band, A, Q, U, or V. (Note that

only A,Q,U, and V bands are available.)

4. Set the Presel Adjust to 0 MHz by pressing

AMPLITUDE, Presel Adjust, 0, MHz.

5. Set the analyzer to zero span by pressing

SPAN, Zero Span.

6. Set the analyzer center frequency by pressing

FREQUENCY, Center Freq, and enter the

corresponding value for the appropriate mixer. (Refer to Table 3-4.) On the rear panel of

the Agilent 11974, adjust the corresponding potentiometer until one or both of the green

LEDs are lit.

7. Change the analyzer center frequency to the value indicated in Table 3-5. and again

adjust the corresponding potentiometer on the rear panel of the 11974 until one or both

of the green LEDs are lit.

8. Repeat steps 6 and 7 until the green LEDs are lit at both frequencies without additional

adjustments.

Table 3-4.

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”

11974V 50.0 GHz “50.0 GHz Adjust”

Table 3-5.

Mixer

Agilent P/N

Analyzer Center

Frequency

Potentiometer

11974A 40.0 GHz “40.0 GHz Adjust”

11974Q 50.0 GHz “50.0 GHz Adjust”

11974U 60.0 GHz “60.0 GHz Adjust”

11974V 75.0 GHz “75.0 GHz Adjust”

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