Agilent Technologies HP 70910A Guia do Utilizador descarregar pdf (Página 107)

Chapter 4 107

Performance Tests

Frequency Tracking Calibration with an 8566B Spectrum Analyzer

Performance Tests

Frequency Tracking Calibration with an 8566B Spectrum

Analyzer

NOTE In order for the 8566B to be compatible with the 11974 Series Preselected

Millimeter Mixer, it must have a serial prefix of 2948 or later. If not, retrofit

kit 8566B K74 must be installed before using an 8566B for the testing of the

11974.

1. Connect the IF OUT of the 11974 to the IF INPUT of the spectrum analyzer, the

spectrum analyzer 1ST LO OUTPUT to the INPUT of the 11975A Amplifier, and the

11975A Amplifier OUTPUT to the LO IN of the 11974.

CAUTION When you are using an 11975A Amplifier with an 11974, you must set the

amplifier rear-panel ALC switch to ON before you connect the amplifier to the

test setup. If the ALC switch is left in the OFF position, the amplifier output

power is high enough to destroy the mixer diodes.

2. Connect the SWEEP + TUNE OUT of the spectrum analyzer to the TUNE IN of the

11974.

3. Set the 11974 rear-panel switches

8566B and LEDS to the ON position, and the

8563A/61B/60A and 70907B switches to the OFF position, for the 11974 to properly scale

the tune ramp of the analyzer.

4. Set the spectrum analyzer to the correct millimeter band using the following key

sequence for the appropriate mixer:

for an 11974A:

SHIFT ⇑ ⇑

for an 11974Q: SHIFT ⇑ ⇑ ⇑

for an 11974U: SHIFT ⇑ ⇑ ⇑ ⇑

for an 11974V: SHIFT ⇑ ⇑ ⇑ ⇑ ⇑

5. On the spectrum analyzer, set the preselector DAC to 32 (the center of its 0–63 range)

by pressing

SHIFT GHz 32 Hz.

6. Set the spectrum analyzer to a frequency span of 0 Hz by pressing

FREQUENCY SPAN 0 Hz.

NOTE Due to the repetitive nature of this procedure, it may be helpful to save the

center-frequency settings as indicated in step 7 and step 9 in unused state

registers.

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 153 154

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Agilent Technologies HP 70910A Guia do Utilizador Página 107