Chapter 2 141
Adjustment Procedures: HP 3335A Source not Available
5a. DC Log Amplifier Adjustments
A4 Limiter Phase Adjustment
This adjustment consists of adjusting A4R445 for maximum on screen
amplitude under the following conditions.
Procedure
1. Press LINE to turn the spectrum analyzer off. Remove the spectrum
analyzer cover and place the spectrum analyzer in the service
position as illustrated in Figure 2a-3. See Figure 2a-4 for adjustment
location.
2. Connect the HP E4421B RF output to the spectrum analyzer 50Ω
input. Press
LINE to turn the spectrum analyzer on.
3. Set the spectrum analyzer controls as follows:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 kHz
Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −10 dBm
Log/division. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Log/division
Resolution BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz
IF Adjust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
4. Set up an HP E4421B as follows:
Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz
Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −18 dBm
Mod On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off
5. On the spectrum analyzer, press
CAL and ADJ CURR IF STATE, wait
for the spectrum analyzer to complete adjustments, then press
MKR.
6. Adjust A4R445 for maximum on-screen amplitude. Refer to Figure
2a-4 for the location of A4R445.
A4 Linear Fidelity Adjustment
This adjustment consists of adjusting A4R544 until the delta marker
reads −40 dB under the following conditions.
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