Agilent Technologies 8565EC Service Guide

172 Chapter3
Manual Adjustment Procedures: 3335A Source not Available
3a. DC Log Amplifier Adjustments
4. Set up an 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 analyzer to complete adjustments then press
MKR.
6. Adjust A4R445 for maximum on-screen amplitude. Refer to Figure
3a-4 for the location of A4R445.
A4 Linear Fidelity Adjustment
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 3a-3. See Figure 3a-4 for adjustment
location.
2. Connect the E4421B RF output to the spectrum analyzer 50Ω input.
Press
LINE to turn the spectrum analyzer on.
3. On the spectrum analyzer, press
PRESET AMPLITUDE, LINEAR, MORE
1 of 3, AMPTD UNITS, dBm, CAL, and IF ADJ ON OFF (OFF).
4. Set the spectrum analyzer controls as follows:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 MHz
Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . .300 kHz
Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−10 dBm
5. Set up an E4421B as follows:
Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz
Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−10 dBm
Mod On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off
6. On the spectrum analyzer, press
PEAK SEARCH and MARKER DELTA.
7. Reduce the E4421B input power to −58 dBm.
8. If the delta marker amplitude reads −40 dB ±2 dB, no adjustment is
necessary.
9. If the signal is lower on the screen than expected (delta marker
amplitude reads less than −42dB) then adjust A4R544 (see Figure
3a-4) for an even lower level and press CAL and ADJ CURR IF STATE.
Allow sufficient time for the analyzer to complete the adjustment.

Agilent Technologies 8565EC Specifications

General

Brand	Agilent Technologies
Model	8565EC
Category	Measuring Instruments
Language	English