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MODEL 615
CALIBRATION
i.
Overload
Blanking
Check.
see the sensitivity
switch
for
1.0000
(with
the Range set to volts).
Apply
1 volt
at the input
and increase
until
the read-
ing blanks.
Blanking
should
occur
lust
beyond
1.999
dts.
Set the Sene~civiry
switch
to 100.6 volts.
Apply
90 "olte
ae the input
and increeee
until
the
reading
blanks.
Blanking
should
occur
,usr
beyond
99.9 volts.
,.
A-to-D
Comrerter
Calibration.
Set the front
panel
conrro1e
88 follows:
Zero Check Buttm
-
Lock
Sensitivity
Switch
-
1.000
Range Switch
-
VOLTS
Feedback
Switch
-
Normal
Connect digital
voltmeter
(B) to the 1 vale
analog
output.
Unlock
the set.0 check button.
Apply
approx.
+2 volts
at input
using
Voltage
Source
0).
AdjusC
the input
e~urce
so that
the analog
reading
is +1.9995
Volts.
Adjust
the l CAL potentiometer
(R611) so that
rhe display
indicates
between
+1.999
volts
and a blank-
ed display
(overload).
(Meplay
should
alternate
be-
tween readings.)
After
the +CAL 18 adjusted
check
the reading
by reducing
the input
voltage
until
the
digital
display
indicates
between
to.999
valts
and
+1.000 volts.
The analog
output
should
read benreen
0.999 volts
and 1.000 volts.
Repeat
the above steps
using
-1.9995
valta
and adjust
the -CAL potentiomerer
(R606).
0372
51
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