HP 8559A 36.Short A11TP3, A1 lTP6, A13TP3, and A13TP6 to ground, 37.Set RESOLUTION BW to 100 kHz and FREQ SPAN/DIV to 200 kHz, NOTE, Bandwidth Amplitude

MODEL 8559A ADJUSTMENTS

ADJUSTMENTS

5-21. BANDWIDTH FILTER ADJUSTMENTS(Cont'd)

26.Short to ground A1lTP3, A1lTP6, and A13TP3. Set RESOLUTION BW to 100 kHz and set FREQ SPAN/DIV to 20 kHz.

27.Center signal on CRT with TUNING control. Adjust A13C45 LC CTR for symmetrical bandpass display on CRT Use FINE TUNING control to keep crystal spike centered.

NOTE

The crystal spike represents the center frequency of the crystal poles. In this procedure we are aligning the LC poles with the crystal poles. On some instruments, the crystal spike may not be very pronounced, in which case the center frequency of the 100 kHz RBW will have to be compared to the center frequency of the 30 kHz RBW.

28.Move short from A13TP3 to A13TP6. Leave other shorts in place. Center signal on CRT with TUNING control. Adjust A13C23 LC CTR for symmetrical bandpass display on CRT, keeping crystal spike cen- tered.

29.Move short from A11TP6 to A13TP3. Leave other shorts in place. Center signal on CRT with TUNING control. Adjust A1lC45 LC CTR for symmetrical bandpass display on CRT, keeping crystal spike cen- tered.

30.Move short from A11TP3 to A11TP6. Leave other shorts in place. Center signal on CRT with TUNING control. Adjust A1 1C23 LC CTR for symmetrical bandpass display on CRT, keeping crystal spike cen- tered.

31.Disconnect shorts from A11TP6, A13TP3, A13TP6, and from ground. Remove jumper from A9TP6 and A9TP8.

32.Set FREQ SPAN/DIV to 10 kHz and RESOLUTION BW to 30 kHz. Center signal on ~ R withT TUN- ING control. Set RESOLUTION BW to 100 kHz and note where signal crosses center vertical graticule line.

33.Adjust A1lC23, A11C45, A13C23, and A13C45 in succession so that amplitude of signal is peaked where it crosses center vertical CRT graticule line, repeating step 32 between adjustments as necessary.

34.Repeat steps 32 and 33 until 30 kHz and 100 kHz bandwidths are centered with each other. If signal shift between 30 kHz and 100 kHz bandwidthsis greater than 10 kHz (1 division), repeat steps 24 through 33.

Bandwidth Amplitude35.Set AmplitudeScale switch to 1 dB/DIV and jumper A9TP6 to A9TP8.36.Short A11TP3, A1 lTP6, A13TP3, and A13TP6 to ground.37.Set RESOLUTION BW to 100 kHz and FREQ SPAN/DIV to 200 kHz.