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Model 5245L
Table
3-2.
In-Cabinet Performance Check (cont'd)
3.
Print
Command: Negative step from
+13
volts to
0
volts,
DC-coupled.
a.
Connect
Oscilloscope
to DIGITAL
RECORDER
jack (Jl1) pin
48.
b.
Set
Counter
controls as follows:
SAMPLE
RATE slightly clockwise out of
POWER
OFF
SENSITIVITY
to
CHECK
TIME
BASE
to
10 ms
FI]NCTION
to
FREQUENCY
c.
The
Oscilloscope should display the
print
command step
(-13 volts
for
each
counting cycle).
Record
the amplitude of this negative step
on
test
card.
4.
Hold-Off Requirements: +15V
min.,
+25Y
mrx. from
chassis ground
(tOOO-ofrm
source).
a.
Set
Counter
controls as follows:
SAMPLE
RATE slightly clockwise out of
POWER
OFF
SENSITTVITY
to
CHECK
TIME
BASE
to
10
s
STORAGE (on
rear
panel)
to non-storage
FUNCTION
to
FREQUENCY
b.
With
DC
Power Supply, apply hold-off voltage,
+25
volts in series with a
1000-ohm
resistor
to
DIGITAL RECORDER,jack (J11) Pin22
on
the rear
panel.
The Counter should stop
until
the
hold-off voltage is
removed
from
Jtt,
pin
22.
Record
hold-off voltage
on
test
card.
c.
Repeat
step
b,
using
+15
hold-off
voltage.
Record
hold-off voltage
on
test
card.
Note
this
check
can
be
made
using any
hold-off
voltage
from
+15
volts to
+25
volts.
GATE INDICATOR. Front panel indication of main gate 'ropen"
state
a.
Set
Counter
controls as follows:
SENSITIVITY
to
CHECK
SAMPLE
RATE slightly clockwise out of
POWER
OFF
TIME
BASE
to
10 s
FIINCTION
to MANUAL
STOP
-
LEVEL + to
PRESET
b.
Set
Counter FUNCTION
switch to MANUAL START, the Counter gate lamp should turn
on.
Record results
on
test
card.
RE-SET
CAPABILITY.
A momentary control
on
the
front
panel
that returns both the displayed
and
internal
count
to
zero.
a.
Set
Counter
controls as follows:
SENSITTVITY
to
CHECK
SAMPLE
RATE slightly clockwise out of
POWER
OFF
TIME
BASE
TO
10s
FI]NCTION
to
FREQUENCY
-
LEVEL + to
PRESET
b.
Push
front
panel RESET
pushbutton.
Counter should
reset
and
then
start
a new
count.
Record
result
on
test
card.
Section
Itr
Table 3-2
02349-1
3-
11
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