Agilent Technologies 856290216 service manual A5 Reference Attenuator Adjustment

4.IF Amplitude Adjustments

3.Set the spectrum analyzer controls as follows:

Center frequency		10.7 MHz
Span		200kHz
Reference	level	- 6 0 dBm
Attenuator		. . OdB
dB/division		1 dB/DIV
Resolution	bandwidth	300 kHz
Videobandwidth		100 Hz

4.On the spectrum analyzer, press IrV1KR), ICAL), and IF ADJ ON OFF so OFF is underlined.

5.Set the HP 3335A controls as follows:

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7MHz Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55dBm

6.Note the marker value. Ideally it should read -60 dBm fO.l dB.

7.If the marker reads below -60.1 dBm, rotate A4R826 CAL OSC AMPTD one-third turn clockwise for every 0.1 dB below -60 dBm. If the marker reads above -59.9 dBm, rotate A4R826 CAL OSC AMPTD one-third turn counter clockwise for every 0.1 dB above -60 dBm. See Figure 2-8 for the location of A4R826. A change in the displayed amplitude will not be seen until ADJ CURE II? STATE is pressed.

Note	If A4R826 has inadequate range, refer to “Inadequate CAL OSC AMPTD
	Range” in Chapter 9, “IF Section.”

8.Press ADJ CURE IF STATE . After allowing the analyzer time to complete the adjustments, the displayed amplitude and marker reading should change.

9.Repeat steps 7 and 8 until the marker reads -60 dBm fO.l dB.

10.Disconnect the test cable from A5J3 and reconnect W29 to A5J3.

A5 Reference Attenuator Adjustment

11.Set the spectrum analyzer reference level to -60 dBm. If markers are displayed, press (MKR) and MAEEEES OFF .

12.Set the HP 3335A (-1 to -60 dBm.

13.Connect a BNC cable between the 50 R output of the HP 3335A and the spectrum analyzer INPUT 500.

14.On the spectrum analyzer, press ICAL) and EEF LVL ADJ . Use the front-panel knob or step keys to place the peak of the displayed signal 3 dB to 5 dB below the reference level.

15.Press (PEAK SEARCH) and MARKER DELTA on the spectrum analyzer. Set the spectrum analyzer reference level to -10 dBm.

16.Change the HP 3335A [m) to -10 dBm.

17.Press LCAL) on the spectrum analyzer.

2-28 Adjustment Procedures