166 Chapter3
Manual Adjustment Procedures: 3335A Source not Available
2a. IF Amplitude Adjustments
3. Set the spectrum analyzer controls as follows:
Center Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200 kHz
Reference Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−60 dBm
Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 dB
dB/division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 dB/DIV
Resolution bandwidth. . . . . . . . . . . . . . . . . . . . . . . . . . . .300 kHz
Video bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100 Hz
4. On the spectrum analyzer, press
MKR, CAL, and IF ADJ ON OFF so
OFF is underlined.
5. Set the E4421B controls as follows:
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 MHz
Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−55 dBm
Mod On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off
6. Note the marker value. Ideally it should read −60 dBm ±0.1 dB.
7. If the marker reads less than −60.1 dBm, rotate A4R826 CAL OSC
AMPTD one-third turn clockwise for every 0.1 dB less than
−60 dBm. See Figure 3a-2 for the location of A4R826. A change in
the displayed amplitude will not be seen until
ADJ CURR IF STATE is
pressed.
8. If the marker reads greater than −59.9 dBm, rotate A4R826 CAL
OSC AMPTD one-third turn counter clockwise for every 0.1 dB
greater than −60 dBm. See Figure 3a-2 for the location of A4R826. A
change in the displayed amplitude will not be seen until
ADJ CURR IF
STATE is pressed.
NOTE If A4R826 has inadequate range, refer to “Inadequate CAL OSC
AMPTD Range” in Chapter 9 .
9. On the spectrum analyzer, press
ADJ CURR IF STATE. After allowing
the analyzer time to complete the adjustments, the displayed
amplitude and marker reading should change.
10.Repeat step 7 and step 9 until the marker reads −60 dBm ±0.1 dB.
11.Disconnect the test cable from A5J3 and reconnect W29 to A5J3.
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