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INSTRUCTION
MANUAL
MAINTENANCE
Digit+ MultImeter
Modrlr 172A. 173A
Repeat
steps
d.
through
f.
IO?000
+ IO digits
on LOn.
until
the
reading
is
10.000
i 2 digits
on HI :: and
2)
290Kn
Adjustment.
a.
Select
3OOKn HI,
2 wire.
.
Connect
the
decade
resistor
(c)
between
input
(upper)
terminals.
Set decade
resistor
for
290.000KR.
Ob
14 t.
Adjust
potentiometer
~116
(290Kn)
for
a reading
of
290.00
?I
digit.
3)
2.9Kn
Adjustment.
a.
Select
3KQ HIQ,
4 wire.
.
Connect
the
decade
resistor
to the
instrument
using
the
2-wire
configuration.
Set
the
decade
resistor
to
2.9000Kn.
Ob
I5 c.
Adjust
potentiometer
RI17
(2.9Kn)
for
a reading
of
2.9000
+I
digit.
e.
DC Current
Calibration
(Model
l73A
Onlv).
I)
I Ampere
Adjustment.
a.
Select
DCA and MAN ranging.
b.
Select
3A range.
OC'
Connect
the
current
sdurce
(D)
to the
Hodel
l73A
and apply
+I
ampere.
16 d.
Adjust
potentiometer
R5\2
(IA)
for
a reading
of
1.0000
?I digit.
2)
IOOmA Adjustment.
a.
Set
the
current
source
for
lOO.OOmA.
Ob.
Select
3OOd
range.
17 c.
Adjust
potentiometer
R509
(lOOmA)
for
a reading
of
100.00
fl
digit.
3)
IOmA Adjustment.
a.
Set
the
current
source
for
10.00mA.
Ob.
Select
3OmA range.
18 c.
Adjust
potentiometer
R506 (lOmA)
for
a reading
of
10.000
*I
digit.
f.
Current
Calibration
for
Model
172A.
No adjustments
can be made.
which
determlnes
accuracy
is
reststor
R514 (In,
O.l%,
low,
KU).
Primary
.component
6-l:
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