Agilent Technologies 856290216 service manual A4 LOG Fidelity Adjustment

5. DC Log Amplifier Adjustments

11. Repeat steps 5 through 10.

A4 LOG 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 2-9.

See Figure 2-10 for adjustment location.

2.Connect the HP 3335 50 0 output to the spectrum analyzer 50 fl input. Press (LINE) to turn the spectrum analyzer on.

3.Press (-),a, IF AlI> ON OFF (OFF), AD3 CURR IF STATE.

4. Set the spectrum analyzer controls as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..O Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10 dBm

5. Set up an HP 3335A as follows:

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..15MHz Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10 dBm

6.,Press (MKR), MARKER DELTA on the spectrum analyzer.

7.Decrease the HP 3335A power to -26 dBm.

8.Calculate the error:

Error = delta marker reading - 16 dB

9.If the error is less than f0.2 dB, no adjustment is necessary.

10.Set the HP 3335A power to -10 dBm.

11.Adjust A4R531 ( see Figure 2-10) to read two times the error. For example, if the calculated error is +0.75 dB, adjust A4R531 for a delta marker amplitude reading of t1.5 dB. Press (CAL), ALU CUEE IF STATE .

12.Repeat steps 7 through 11.

Adjustment Procedures 2-33