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Table 3-4. Resistance
Accuracy
Check
Allowable
Reading at
Range
Resigtance
180 to
28%
l
2000
1900
189.86 to 190.140
* 2 diQits
2kQ
1.900kR
1.8989 to 1.9011 kO
+ 2 disits
20kR
19.000kfl
18.989 to 19.011kR
+ 2 digits
200kR
190.00kfI
189.89 to 190.11kfI
+2 digits
2000kO
1900.0k0
1898.9 to 1901.lkR
*2 digits
20MR
lO.OOOMfl
9.988 to 10.012MR
f 1 digit
*Manufacturer's
specified
unceflainty
of the decade
resistor
in
digits. This uncertainty
has been added to the specified
accuracy
of
the
Model
177
to
obtain
the
allowable
reading.
3.4.6 DC Current
Accuracy
Check
1. Select the DC current
function
with the AC/DC
and A
pushbuttons.
2. Select the 20cA range. With an open circuit at the INPUT
terminals
of the Model 177, adjust the front panel ZERO
for a display
indication
of 0.000
1tO.00l~A
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
Applied
-
Current
lOO.OO~A --
L
1 .OOOOmA
lO.OOOmA
lOO.OOmA
lOOO.OmA
I
0.9979 to 1.002imA
9.979 to 10.021mA
99.79 to 100.21mA
997.9 to 1002.lmA
3.4.7 Analysis
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 ncate in
paraQraph
3.1.
NOTE
It is not necessary
to specifically
check the 20R
or 20uA ranaes. or a"" of the ACA ranaes. The
circuit
components
that determine
th&
accu-
racy
have
been
checked
elsewhere
in the
verification
procedure.
3-313-4
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