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Range
200Q
2kfl
20kfi
200kfl
2000kfl
20MQ
1900
1
.900k0
19.000k0
190.00k0
1900.0k0
10.000MO
189.86
to
190.140
1.8989
to
1.9011kO
18.989
to 19.01
IkO
189.89
to
190.11kO
1898.9
to 1901.
IkO
9.988
to
10.012MO
±2
digits
±2
digits
±2
digits
±2
digits
±2
digits
±
1
digit
•Manufacturer's
specified
uncertainty
of
the
decade
resistor
in
digits.
This uncertainty has
been
added
to
the
specified
accuracy
of
the
Modei
177
to
obtain
the
aiiowabte
reading.
1.
Seiect the
DC
current function
with the
AC/
DC
and
A
pushbuttons.
2.
Seiect the 20/iA range.
With
an
open
circuit at
the
iNPUT
terminals of the
Model
177, adjust
the
front panei
ZERO
for
a
dispiay indication of
0.000
±0.001^
flashing.
3.
Connect
the
DC
current
source
to the
DMM.
4.
Select
each range and
apply the
required current as
specified
in
Table
3-5.
Verify that
each
reading
is
within
specification.
Table
3-5.
DC
Current
Accuracy Check
Range
Applied
Current
Allowable Reading
at
18° to
28°C
200/iA
2mA
20mA
200mA
2000mA
100.00/iA
1.0000mA
10.000mA
100.00mA
1000.0mA
99.79
to
100.2VA
0.9979
to
1.0021mA
9.979
to
10.021mA
99.79
to
100.21mA
997.9
to
1002.1mA
If
the instrument
is
out
of specified
limits
at
any
point
in
Table
3-2
through
3-5, calibrate
the
DMM
as described
in
Section
5,
If
the
unit
is
still
under
warranty,
refer
to
the note
ir
paragraph
3.1.
NOTE
It
is
not necessary
to
specifically
check
the 20fi
or
20/iA ranges,
or
any
of
the
ACA
ranges.
The
circuit
components
that
determine
their
accu-
racy
have been checked
elsewhere
in
the
verification
procedure.
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