Agilent Technologies 8564EC Service Manual page 480

9. Check the voltage at A14J15 pin 3 with the spectrum analyzer
Table 12-5 Sweep + Tune Multiplier Values
N* Center
Frequency
1 5 GHz
2 10 GHz
4 15 GHz
4 20 GHz
4 30 GHz
8 40 GHz
8 50 GHz
†
Gain is the ratio of the change in the voltage at A14J15 pin 3 to the change in the
10.Move the WR PROT/WR ENA jumper on the A2 Controller assembly
11.Set the spectrum analyzer to the following settings:
12.On the spectrum analyzer, press
13.Connect a DVM to A14J16 pin 13.
14.Set the DAC to values from 0 to 255 to yield DVM readings from 0 V
15.Set the spectrum analyzer center frequency to 40 GHz and measure
16.Connect the DVM to A14J16 pin 1.
17.Press
18.Set the DAC to values from 0 to 255 to yield DVM readings from 0 V
19.On the spectrum analyzer, press
Chapter 12
center frequency set to the frequencies listed in
following table lists the voltage that should be measured at A14J15
pin 3, the settings for the four switches (U416 in function block Q),
and the gain through the Sweep + Tune Multiplier.
A14J15 Pin 3 U416A
(Vdc)
−1.33
Open
−2.58
Open
−3.83
Open
−5.08
Open
−6.52
Open
−10.98
Open
−13.48
Open
* N is the harmonic mixing mode.
voltage at A14J15 pin 1, within a given band.
to the WR ENA position.
Center frequency ........................................................ 5 GHz
Span .............................................................................. 0 Hz
, , and
DATA PRESEL ADJ
to −10 V respectively.
the voltage at A14U414 pin 1: V
PRESEL SLOPE
to the voltage measured in step 15.
U416B U416C
Closed Closed
Closed Open
Closed Open
Closed Open
Closed Open
Open Open
Open Open
,
CAL MORE 1 OF 2
.
PRESEL OFFSET
.
and
CAL
RF Section
A14 Frequency Control Assembly
Table 12-5. The
U416D †
Gain
−0.208
Closed
−0.417
Closed
−0.833
Open
−0.833
Open
−0.833
Open
−1.666
Open
−1.666
Open
,
SERVICE CAL
.
REALIGN LO & IF
619