HP 8560E - Procedure

Chapter 2 77
Adjustment Procedures
4. IF Amplitude Adjustments
Procedure
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 2-6 on page 75. See Figure 2-7 on
page 76 for adjustment location.
2. Disconnect W29, violet coax cable, from A5J3. Connect the test cable
between A5J3 and the 50 Ω output of the HP 3335A. Press
LINE to
turn the spectrum analyzer on.
3. Set the HP 8560E/EC controls as follows:
Center frequency .......................................................10.7MHz
Span ....... ......................................................................200kHz
Reference level ........ ....................................................−60dBm
Attenuator ..........................................................................0dB
Log/division .........................................................1Log/division
Resolution BW .......... ...................................................300kHz
Video BW ........... ............................................................100Hz
4. On the HP 8560E/EC, press
MKR, CAL, and IF ADJ OFF.
5. Set the HP 3335A controls as follows:
Frequency ..................................................................10.7MHz
Amplitude ......... ..........................................................−55dBm
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 counter-clockwise for every 0.1 dB less than
−60 dBm. See Figure 2-7 on page 76 for the location of A4R826.
8. If the marker reads greater than −59.9 dBm, rotate A4R826 CAL
OSC AMPTD one-third turn clockwise for every 0.1 dB greater than
−60 dBm. A change in the displayed amplitude will not be seen at
this point.
NOTE If A4R826 has inadequate range, refer to "Inadequate CAL OSC
AMPTD Range" in Chapter 9.
9. Press
ADJ CURR IF STATE. After allowing the spectrum analyzer time
to complete the adjustments, the displayed amplitude and marker
reading should change.
10.Repeat steps 7 and 8 until the marker reads −60 dBm ±0.1 dB.
11.Disconnect the test cable from A5J3 and reconnect W29 to A5J3.