Adjustments
3314
UNIVERSAL
COUNTER
Model 3314A
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Figure
5·6.
Linear
Sweep
Start
Frequency
Adjustment
C. Connect the 3314A Sync Output to the counter.
D. Enable the 3314A "Linear Sweep".
E. Perform a calibration
of
the Sweep Stop frequen-
cy by pressing
"Blue",
"RCL".
F. Press
"Man
Sweep".
G. Press
"Stop
Freq"
and record the period
measured on the counter. (This period should be be-
tween 99.7
ps
and
1oo.3ps.)
H. Press
"Start
Freq".
1000Hz should now be
displayed on the 3314A.
I.
While monitoring the counter's display, adjust
A2R205 (Lin Sweep) until a reading lOx the period
recorded in step G
(±
Ips) is measured on the counter.
NOTE
If
this adjustment fails to produce the
desired results, consider possible problems
with A2U201 or the A2U212 analog switch.
5·13.
DC
OFFSET
ADJUSTMENT
This adjustment assures accurate DC Offset levels.
Equipment Required:
AC
/DC
Digital Voltmeter
50n Feedthrough Termination
Procedures:
A. Preset the 3314A.
5-8
B. Set the 3314A as follows:
Function
Off
DC Offset
O.oo2V
C. Set the voltmeter as follows:
Function DC
Range Auto
Trigger Internal
Math
Off
Sample Rate Maximum
D. Connect the 3314A to the voltmeter as shown in
Figure 5-7.
E. Note the DC Offset measured on the voltmeter.
If
necessary, adjust A2R267 (DC Zero) until an Offset
of
O.002VDC ± 5mV is indicated by the voltmeter.
NOTE
If
small errors between the actual and dis-
played offset continue to exist after ad-
justing A2R267, check the values
of
A2R233, A2R234, A2R264, A2R265, and
A2R266 against those given on the schema-
tic.
If
large errors result, look
for
problems
on the output amplifier board.
5·14.
PHASE
LOCK
PHASE
ADJUSTMENT
This adjustment insures the Phase accuracy between the
3314A and the reference to which it is locked, by
regulating bias currents which control the phase dif-
ference and stabilize the phase locked loop.
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