Model 5340A
Maintenance and Service
Figure 5
-
2. Adjustment Procedures
1.
a.
b.
C.
d.
e.
f.
g.
2.
a.
b.
C.
d.
e.
f.
g.
3.
a.
b.
C.
d.
e.
f.
g.
h.
i.
j.
POWER SUPPLY ADJUSTMENTS (05340
-
6001
2)
-
15V Adjustment. On A28
-
15V Regulator board (05340-60022), connect voltmeter to TP2.
Connect other
lead to chassis. Adjust potentiometer
A28R7 for
-
15.00 i0.05 volts indication.
+15V Adjustment. On A29 +15V Regulator board (05340-60025), connect voltmeter lead to TP2. Adjust
potentiometer
A29R5 for t15.00
k0.05
volts indication.
-
5V RF Supply Adjustment. On A31
-
5V Regulator board (05340-60024), connect voltmeter probe to TP2.
Adjust potentiometer
A31R9 for
-
5.00 i0.05 volts indication. A31R9 is near TP1.
-
5V Digital Supply Adjustment. On A31
-
5V Regulator board (05340-60024), connect voltmeter probe to
TP3. Adjust potentiometer
A31R2 for
-
5.00 i0.05 volts indication. A31R2
is
near the front edge of the board
+5V
RF
Supply Adjustment. On A32 +5V Regulator board (05340-60023), connect voltmeter
to
TP1.
Adjustment potentiometer A32R6 for
+LOO
*0.05
volts indication. A32R6 is adjacent to TP1.
+5V Digital Supply Adjustment. On A32 +5V Regulator board (05340-60023), connect voltmeter to TP2.
Adjust potentiometer
A32R3 for t5.00
i0.05
volts indication. R3
is
adjacent to TP2, and near the front
edge of the board.
Time Base Power Supply
(t11V) Adjustment (Option 001). On A33 +11V Regulator board (05340-60039),
connect voltmeter to TP1. Adjust potentiometer A33R8 for +11.00 i0.05 volts.
HIGH
IMPEDANCE AMPLIFIER ADJUSTMENT (05340
-
60001)
Connect a 608 Signal Generator to “10 Hz to 250 MHz” input BNC on 5340A using a 50 ohm feedthru
termination.
Set 608 to 100
MHz
at
100 mV rms. (283 mV p
-
p) (
-
7 dBm).
Set 5340A RANGE switch to 10 Hz
-
250
MHz
and resolution switch to 100 Hz.
On A3 Input board
(05340-60001), adjust potentiometer A3R10 for
a
stable count.
Decrease input signal level and adjust
A3R10 for a stable display.
Continue to decrease input signal level and adjust
A3R10 for maximum sensitivity.
Verify that the 5340A properly measures input signals
of
50 mV rms
or
less (140 mV
p
-
p)
(
-
14
dBm).
50Q DIRECT COUNT ADJUSTMENT (05340
-
60041)
Connect
a
608 Signal Generator to the type
N
connector on the 5340A. Set the generator to 100 MHz at
-
25 dBm (12.6 mV rms) (35.6 mV p
-
p).
Set 5340A RESOLUTION switch to 100 Hz and the RANGE switch to the 10
Hz
to 18 GHz position.
Remove the four screws attaching the cover
on
the A17 (05340
-
60041) Direct Count Assembly. Verify that
the knurled screw is firmly finger tight, securely holding board in position. Replace cover.
Adjust the threshold detector potentiometer
A17A1 R22 full counterclockwise. This
is
accessible through
the front hold in the A17 casting cover.
Adjust sensitivity potentiometer
A17A1 R11 for
a
stable display.
Decrease signal generator output and again adjust
A17A1 R11 for
a
stable display.
Continue
to
decrease signal generator output and adjust A17A1 R11 until maximum sensitivity
is
achieved
Increase generator output until
a
stable reading
is
displayed.
Rotate threshold detector
pofentiometer A17A1 R22 fully clockwise, observing a display of all zeros.
Increase signal generator
output by
1
dB from the level obtained in step h.
k. Rotate threshold detector
pot$;lhometer A17A1 R22 sufficiently counterclockwise until correct reading
is
always displayed.
I
1.
Verify that sensitivity is at least
-
32 dBm. If not, perform A22R52 adjustment (step
11).
5
-
4
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