Region B Amplitude Offset; Mhz Resolution Bandwidth Problems - HP 8560A Service Manual

I".;
RE
5
S A M P L E
C E N T E R
1 0 . 7 0 0 0 0 0 MHz
R E S B W 3 0 0 kHz

1 MHz Resolution Bandwidth Problems

Check the crystal shorting switches as follows:
1. On the spectrum analyzer, press [PRESET) and set the controls as follows:
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. On the spectrum analyzer, connect the 300 MHz CAL OUTPUT to the INPUT 50ohm.
3. If the trace flatness is not within 2.5 dB, a failure probably exists.
4. A trace similar to Figure 8-13 indicates a crystal short failure.
5. Set the spectrum analyzer (SPAN) to 3 MHz. A trace that slopes across the screen (see
Figure 8-14) indicates a failed LC pole. To isolate the broken pole refer to the shape factor
information in "30 kHz Resolution Bandwidth Problems."
8-30 IF Section
20
V B W 3 0 0 kHz
Figure 8-12. Region B Amplitude Offset
S P A N 0 H z
S W P 5 0 0 set
S K 1 8 1
. . l M H z
500kHz