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,MAINTENANCE
INSTRUCTION
MANUAL
Digital MultImeter
Model8
172A.
173A
300mY
3 v
30 v
300 v
1000 v
30 v
300mV
TABLE 6-3.
AC Voltage
Performance
Check.
APPLIED
NOMINAL
VOLTAGE
DISPLAY
@ 20 KHz
0.2000
Vrms
2.0000
Vrms
20.000
Vrms
200.00
Vrms
@ IOkHz
1000.0
Vrms
@ 50Hz
20.000
Vrms
@ IOOkHz
0.2000
Vrms
200.00
2.0000
20.000
200.00
1000.0
20.000
200.00
TOLERANCE (SPECIFIED
ACCURACY) IN DIGITS
20 to
30°C
+ 46 digits
+ 46 digit5
t 46 digits
+ 46 digits
? 31 digits
i 220 digits
2 220 diqits
SOURCE
ERROR'
t 7 digits
+ 6 digits
? 6 digit5
i; 8 digits
* 4 digits
2 15 digits
i 20 digits
*
The Manufacturer's
specified
uncertainty
of
the AC Calibrator
(B).
If
this
calibrator
is
used,
add uncertainty
to Tolerance
to obtain
allowable
reading.
e.
Resistance
Accuracy
Check.
I)
Select
R, HI and 2 WIRE.
2)
Select
AUTO.
3)
Connect
the
Decade
Resistor
(D)
to the
instrument
input
terminals.
Set
the
decade
resistor
to zero
and record
the
resistance
of
the
test
leads.
Subtract
the
lead
resistance
from
the
resistance
reading
on the
Model
172A/l73A
in the
following
steps.
4)
Set
the
decade
resistor
to
the
resistance
values
given
in Table
6-4.
Verify
that
the
readings
are
within
specified
limits
for
HI ohms.
5)
Select
LO ohms and
repeat
th'e decade
resistor
settings
given
in Table
6-4.
Verify
that
the
readings
are
within
specified
limits
for
LO ohms.
6-4
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