Agilent Technologies HP 8566B Dokumentacja Strona 227

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8. 21.4 MHz Bandwidth Filter Adjustments
A10
dB
and
A20
dB
43. Connect CAL OUTPUT to RF INPUT through 1
dB
and 10
dB
step
Adjustments
attenuators. Set step attenuators to 25
dB.
44.
Key in
(CENTER FREQUENCY_)
100
MHz,
(FREQUENCY
SPAN]
3
kHz,
(mj
0
dB,
[RES’
1
kH
z,
(REFERENCE LEVEL) -30
dBm.
45. Key in LOG CENTER
dB/blv]
1
dB,
MARKER [al
46. Key in (REFERENCE LEVEL] -20
dBm.
Set step attenuators to 15
dB.
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] -10
dBm.
Set step attenuators to 5
dB.
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
A4A4R3
decreases the amplitudes of the 3
kHz
through 30
kHz
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 the amplitude of the 1
kHz
resolution bandwidth, perform Adjustment Procedure 7, “3 MHz
Bandwidth Filter Adjustments,
n
and Adjustment Procedure 11,
“Down/Up Converter Adjustments.
n
LC
Dip
Adjustments
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.
55.
Key
in
(CENTER FREQUENCY]
100
MHz,
(jREsBW)
100
kHz,
CFREQUENCY
SPAN)
1 MHz,
(m)
0
dB,
LOG [ENTER dB/DIv]
2
dB.
56. Set step attenuators to 0
dB.
Short
A4A4TP3
to ground.
Adjustments 3-67
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