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CALIBRATION
MODEL 61
SECTION
6.
CALIBRATION
6-L.
GENERAL. me following
test
and adjustaenr
pro-
cedures,
when completed,
will
ensure
that
the inetru-
ment is calibrated
to published
specifications.
If
any portion
of the procedure
cannot
be performed
due
LO malfunction
of the circuitry,
refer
to the servicing
section
of the manual or contact
a Keithley
Sales
Ser-
vice
representative.
6-2.
TEST CONDITIONS.
All
measurements
should
be made
in a laboratory
environment
at approx.
25'C and less
than 50% relative
humidity.
Unless
otherwise
speci-
fied
the instrument
should
be pawered by 117 volts
mm line
at 60 Hz.
(50 Hz for
those
ins'truments
so
designated.)
6-3.
TEST EQUIPMENT. All
measureme,,ts
should
be made
using
test
equipment
which
meets or exceeds
the mini-
mum specifications
given
in Table
6-l.
6-4.
PRELIMINARY PROCEDLW.
Set the POWER switch
to
off
before
connecting
the line
cord.
Place
a shield
cap (Keifhley
part
no. CAP-18) on triaxial
input.
Con-
nect
the line
cord to 117 volts,
60 Hz (use a variable
transformer
if
necessary
to obtain
the proper
voltage
within
+1 volt).
Make certain
that
the third
ground
plug
a" the Line cord is connected
to earth
ground
s
that
the instrument
chassis
is not at B live
potent!
Turn the instrument
on and allow
to warm-up for
one
hour.
(This
will
ensure
that
all
thermal
variations
within
the instrument
have been stabilized:)
6-5.
ADJUSTMENT PROCEDURE.
a.
Zero Adjustment.
Set the front
panel
controls
as follows:
Zero Check Button
-
Lock
Sensitivity
Switch
-
0.0000
Range Switch
-
Volts
Feedback
Switch
-
Normal
With the input
capped,
adjust
the front
panel
zero c<
trol
so that
the polarity
signs
on the digital
displ;
(5,
light
alternately
with
the @ame time interval
fo,
each polarity
(adjust
80 that
+ flashing
rate
is mar
mum).
If
the front
panel
zero control
doea not perm,
sufficient
zeroing
capability,
adjust
the rear
panel
COARSE zero control
(S1205)
until
a polarity
change i
noted.
TABLE 6-l.
Test
Equipment
Code
Latter
Specification
Manufacturer
and Model No.
A
Voltmeter,
Digital
Recorder,
Analog
+o.l%
of reading
l.OOOV to 1000 volts
1 volt
full
scale
Keithley
Model 163
Keithley
Made1 370
Voltmeter,
Digital
+o.Ol% of reading
1.oooov
to 1.9999v
Eldorado
Model 1820A
Voltage
source
Fluke
Modal 34l.A
High "egohm Resistors
~08 to lolzn
+0.2x
Keithley
Model 5155
P
t0.21,
10-Q.
10-gA
3.4X,
lo-loA,
10-llA
Keithley
Model 26L*
G
current
source
5.05%.
lo-lA
to LO-7A
Fluke
34lA
and GR1433
48
037
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