HP 8562E, Service Manual

Page: 73 / 482

5. DC Log Amplifier Adjustments
11. Repeat steps 5 through 10.
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 2-9.
See Figure 2-10 for adjustment location.
2. Connect the HP 3335 50 output to the spectrum analyzer 50 input. Press (LINE) to
turn the spectrum analyzer on.
3. Press IF ON OFF (OFF), AD3 IF STATE.
4. Set the spectrum analyzer controls as follows:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..O
Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
Reference level
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10
5. Set up an HP 3335A as follows:
Frequency
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amplitude
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10
6. MARKER DELTA on the spectrum analyzer.
7. Decrease the HP 3335A power to -26
8. Calculate the error:
Error = delta marker reading 16
9. If the error is less than f0.2 no adjustment is necessary.
10. Set the HP 3335A power to -10
11. Adjust ( see Figure 2-10) to read two times the error. For example, if the
calculated error is adjust for a delta marker amplitude reading of
Press (CAL), IF STATE .
12. Repeat steps 7 through 11.
Adjustment Procedures 2-33