Agilent Technologies 856290216 A4 Linear Fidelity Adjustment, Log Amplifier Adjustments

5.X Log Amplifier Adjustments

3.Set the spectrum analyzer controls as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..O Reference level . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10dBm dB/division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 dB/DIV Resolution bandwidth . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz IFADJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF

4. Set up an HP 3335A as follows:

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -18dBm

5.Press (CAL), ADJ CURR IF STATE, wait for the analyzer to complete adjustments, then ?ress [MKR).

6.Adjust A4R445 for maximum on-screen amplitude. Refer to Figure 2-10 for the location of 44R445.

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 2-9. See Figure 2-10 for adjustment location.

2.Connect the HP 3335A 50 R output to the spectrum analyzer 50 fi input. Press IuNE) to turn the spectrum analyzer on.

3.Press (-1, (m), LINEAR, MORE I. of 3 , AMPTD UNITS ,dBm , a,

IF AD.7 ON OFF, (OFF).

4. Set the spectrum analyzer controls as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..5MHz Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10 dBm

5. Set up an HP 3335A as follows:

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

6.Press [PEAK SEARCH), MAftKER DELTA .

7.Reduce the HP 3335A input power to -58 dBm.

8.If the delta marker amplitude reads -40 dB f2 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 2-10) for an even lower level and press (CAL],

ADJ CURR IF STATE . Allow sufficient time for the analyzer to complete the adjustment.

10.If the signal is higher on the screen than expected (delta marker amplitude reads greater than -38 dB), then adjust A4R544 for an even higher level signal and press ICAL),

ADJ CURR IF STATE. Allow sufficient time for the analyzer to complete the adjustment.

2-32 Adjustment Procedures