HP 8562E Service Manual page 68

4. IF Amplitude Adjustments
3. Set the spectrum analyzer controls as follows:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
dB/division
Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Videobandwidth
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.
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.
11. Set the spectrum analyzer reference level to -60 dBm. If markers are displayed, press
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.
Press
( )
PEAK SEARCH
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
and MARKER DELTA on the spectrum analyzer. Set the spectrum
10.7 MHz
200kHz
- 6 0 dBm
dB/DIV
300 kHz
100 Hz