HP 8566B Adjustment Manual page 227

43. Connect CAL OUTPUT to RF INPUT through 1 dB and 10 dB step
attenuators. Set step attenuators to 25 dB.
(
4 4 . Key in
CENTER FREQUENCY
45. C
Key in LOG
ENTER
46. (
Key in
REFERENCE LEVEL
47. Adjust A4A8R7 AlOdB to align markers on display. MARKER
A level should indicate 0.00 dB. See Figure 3-43 for location of
adjustment.
[
48. Key in
REFERENCE LEVEL
49. Adjust A4A8R6 A2OdB to align markers on display. MARKER
A level should indicate 0.00 dB. See Figure 3-43 for location of
adjustment.
50. Refer to Performance Test 5, "Resolution Bandwidth Switching
Uncertainty Test", and check the amplitudes of resolution
bandwidths from 1 kHz through 3 MHz. If the amplitude of the
300 kHz resolution bandwidth is more than 0.3 dB low relative to
the 100 kHz and 1 MHz resolution bandwidths, perform steps 51
through 71, LC Dip Adjustments.
If the amplitudes of the 3 kHz, 10 kHz, and 30 kHz resolution
bandwidths are not within 50.4 dB of the amplitude of the 1
MHz resolution bandwidth, perform steps 1 through 12 (Bandpass
Filter Adjustments) of Adjustment Procedure 5, "Log Amplifier
Adjustments" and then check the amplitudes of the resolution
bandwidths from 3 kHz through 3 MHz again. If the amplitudes
of the 3 kHz, 10 kHz, and 30 kHz resolution bandwidths are still
not within f0.4 dB of the 1 MHz resolution bandwidth, change
the value of factory-select component A4A4R35 or A4A4R3.
An increase of one standard value of A4A4R35 decreases the
amplitudes of the 100 kHz through 3 MHz resolution bandwidths
by approximately 0.15 dB. An increase of one standard value of
resolution bandwidths by approximately 0.05 dB.
If the amplitudes of the 3 kHz through 3 MHz resolution
bandwidths are not within f0.4 dB of
resolution bandwidth, perform Adjustment Procedure 7, "3 MHz
Bandwidth Filter Adjustments, n and Adjustment Procedure 11,
"Down/Up Converter Adjustments. n
51. Set spectrum analyzer LINE switch to STANDBY.
52. Disconnect cable 97 (white/violet) from A4A8Jl and connect cable
to A4A6Jl.
53. Remove A4A4 Bandwidth Filter and install on 2 extender boards.
54. Set spectrum analyzer LINE switch to ON. Press (2-22-I.
5 5 . Key in (
C E N T E R F R E Q U E N C Y
1 MHz,
56. Set step attenuators to 0 dB. Short A4A4TP3 to ground.
8. 21.4 MHz Bandwidth Filter Adjustments
_)
100 MHz, (
FREQUENCY
z, (
REFERENCE LEVEL
]
-20 dBm. Set step attenuators to 15 dB.
]
-10 dBm. Set step attenuators to 5 dB.
the amplitude of the 1 kHz
] 100 MHz, (jREsBW) 100 kHz,
0 dB, LOG
3
)
-30 dBm.
[
ENTER
Adjustments 3-67