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Model 654A
Section V
SECTION V
MAINTENANCE
5-1. INTRODUCTION.
5-2. This
section
contains
maintenance
and
service
information
for
the
-hp-
Model 654A Test Oscillator.
Included
are
performance checks and adjustment and
calibration procedures.
5-3. Tabl
e
5-1 lists
the equipment
required to properly
maintain the Model
654A.
If the recommended model is
not
available. any
instrument that has specifications
equal
to, or better
than
.
the required specifications may be used.
5-4. PERFORMANCE CHECKS.
5-5
The
performance checks are in-cabinet tests (except
where noted) to
cOlllpare
the performance of the Mod el
654A
with the
specifications given
in Table I-I. These
checks
Illay be used for incoming inspection. periodic
maintenance
and for
performance checks after a repair. The
Performance Check Test card at the end of Section V may
be
cut out, and
used as a permanent record of the
instrument's performance during incoming inspection. It is
recommended t hat performance checks and, if necessary.
calibration be performed every 90 days.
5·6. FREOUE'NCY CHECKS.
5-7. FREQUENCY RANGE CHECK.
a.
Connect
all electronic counter
to the 654A rear
panel COUNTER OUTPUT.
b.
Set the
654A controls as
follows
:
FREQUENCY RANGE
......
.
.
...
XIO
FREQUENCY dial. . .
.
... Extreme
clockwise
c.
The
counter should
indicate a period
average of
lOOms
or greater.
verifying a frequency
of
10Hz,
or
less,
at
the lower end of the frequency range.
d.
Set
the FREQUENCY RANGE switch to XIM and
FREQUENCY
dial
to
its
extreme
counter-clockwise
postiton. The counter
should
indicate a frequency of 10MHz, or
greater,
verifying a frequency of at least 10MHz
at
the
upper end
of
the frequency range.
e.
Perform the Frequency Adjustments (Paragraphs
5-47 through 5-57) if the tolerances
are
not met.
5-8. FREQUENCY ACCURACY CHECK.
a.
Connect an electronic counter to the
654A
rear
panel COUNTER OUTPUT.
b. Set the 654A controls as follows:
FREQUENCY RANGE ..
...
.
.
.......... XIO
FREQUENCY dial ........................ 1
c.
Verify frequency accuracy using the settings
and
tolerances
given
in Table 5-2. Use the period
average setting on
the
counter
for
frequencies
below
I
k Hz
and
use the frequency
setting for
frequencies
above
I
kHz
.
d
.
Perform the frequency
adjustments (Paragraphs
547
through
5-57) if
the tolerances
are
not met.
5·9. AMPLITUDE ACCURACY CHECKS.
(See
also Table 3-1, Page 3-1).
5-10
.
SO UNBAL AMPLITUDE ACCURACY.
a.
Connect the equipment as shown in Figure 5-1.
Use the 50 ohm Feedthrough termination which
should
be connected directly to the 654A
output
connector.
b. Set the
654A
controls
as
follows:
FREQUENCY dial..
..
....
..
I
FREQUENCY RANGE
. , . , .
XI K
OUTPUT LEVEL dBm
........
.
.
".
.
+ I 0,0
IMPEDANCE .....
....
..
..
.......
50
UNBAL
AMPLITUDE
..
.
.
...
..
..
..
.. Adjust
for OdBm
on
654A meter.
c.
The
ilC
voltmcter iIHJication
should be
betwecn
.7000
V rms
allLl
7
1.:11
V
rnlS
verifying an abso-
lute
level
of+ 10
dBnl.
+/-1',"
d. If the tolerances are not
met
perform th
e
Meter
Tracking and Amplitude Control Adjustments
of
Pmagraphs 5-58 through 5-60.
5-11. 75 UNBAL AMPLITUDE ACCURACY.
a. Perform the procedure of Paragraph 5-10
except:
instep a. Use
the
75
ohm
feedthrough
termination;
5-1
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