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Model
5315A/B
Adj
ust ments
5-4
5-15.
INPUT OFFSET ADJUSTMENTS
5- 16. The
input
offset
adjustments are made to
the
A4
assembly
as follows:
a.
Connect
an oscilloscope
to Pin
5
of A4P1.
b.
Us
ing
a SOO feed through,
connect
a 10
MHz
sine wave to Cha nnel A in
put
BNC.
c.
Adj ust oscil loscope
for
stable
display and
then
decrease ampl
itude
of
10 M
Hz
si
ne
wave
to the
minimum allowable (typically
10
mV
rms)
to
maintain disp
lay.
d.
Adjust A4R32
for
50-50
duty cycle of
the
osci
lloscope
display.
e.
Reconnect
oscilloscope to
Pin 6
of
Pl
and 10 MHz sine wave
to
Channel
B input
BNC.
f.
Repeat step
c.
g.
Adjust
A4Rl for
50-50 duty cycle
of
t
he oscilloscope display.
h.
This completes the
inpu
t offset
adjustments.
5-17.
LOCAL OSCILLATOR ADJUSTMENT
5-18. Every
few months, the
reference osci llator should
be
checked
to
a
known or house
fre-
quency sta ndard.
When
adjustment
is required, use the followi ng
method
:
a.
Connect a known
reference
frequency
(~1
M
Hz)
to Chan nel A
input.
See
Table
1-1
Specifications, for
mi
nimu
m
input
requirements
and
range.
b.
Press function
key GATE
TI
ME
and
insure the Blue
Shift key
is
in
the IN
position.
c.
Adjust th
e
GATE
TI
M
E
control for
..
,
second gate.
d.
Press
fu nction key
FREQ
A
and
insu re the
Blu
e Sh
ih
key
is
in
the QUT position.
e.
Ad just
A1C12 for
the most
accurate
display
o
f
the
reference
frequen
cy.
5-19. OPTION 001 OSCILLATOR ADJUSTMENT
PATTE RN MOVEMENT
UNKNOWN HIGH -
UNKNOWN
lOW
___
r--------
I
53158
5315A
FREC STD
our
TR IGGE
RED
SWEEP
OSCI L L.OSCCPE
01Zj
•
.
.
0
_
,
0
i
....
,
~
EXT
SYNC
INPUT
INPUT
0
0
REFERE
NC
E
FREOU ENC
Y
ST
A NDA
RD
100 kH
z.
1
MHz,
5MHz
or 10
MHz
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