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Service
Model 8901B
Direct Control
Special Function
0.396
n b l e 80-13.
Attenuation Stepping,
@
Step 6
Display Limits
Minimum
I
Maximum
Attenuator
1
0.12
I
0.22
0.397, 0.3EB
4 , 5 dB
1.24
0.3ED
4 , l O
dB
0.70
0.3EE
4 , 1 5 dB
7. Key in 0.3E7 SPCL and 49.C SPCL. Increase the signal source frequency until the display drops
to 1.0. Record the signal source's frequency.
8. Decrease the signal source frequency until the display rises to 2.0 then drops to 1.0. Note the signal
source's frequency. The difference between this frequency and the frequency in step 7 should be
between 33 and 55 kHz. If faulty, see Service Sheet 34 and check the Second Channel
1
Filter.
9. Key in 0.39F SPCL to select channel 2. Key in 49.C SPCL. Set the signal source frequency to
455
kHz
then fine tune the source to peak the signal on the Measuring Receiver's display. (Filter
passband ripple
can
be
as
high as 2
dB.
Find the highest peak of the ripple.) The display should
read between 1.5 and 2.5. If faulty, see Service Sheet 34 and check Second Channel 2 Filter.
10. Set the signal source level for a Measuring Receiver display of 2.00.
11.
Increase the signal source frequency until the display drops to 1.0. Record the signal source's
frequency.
12. Decrease the signal source frequency until the display rises to 2.0 then drops to 1.0. Note the signal
source's frequency. The difference between this frequency and the frequency in step
1 1
should be
between 3 and 7
kHz.
If faulty, see Service Sheet 34 and check the Second Channel 2 Filter.
13. Key in 0.3FO SPCL to read back the Option Series 030 Installed Indicator. The Measuring
Receiver should display 000001.0000. If faulty, see Service Sheet 34 and check the Option Series
030 Installed Indicator.
8D-36
Service Sheet BD3
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