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INSTRUCTION
MANUAL
Dlgllal Mulllmeter
Models
172.
173
MAINTENANCE
f.
Current
Accuracy
Check.
(Model
173
only)
1.
DC Current.
a)
Set
to
DC Amperes.,
b)
Set
to AUTO.
C)
Connect
Current
Source
(E)
to
the
instrument
input
terminals.
d)
Set
the
Current
Source
to
the
current
specified
in
Table
6-7.
Verify
the
readings
given.
TABLE
6-7.
DC Current
Performance
Check
(Model
173
only)
Current
Allowable
Reading
(at
25'C)
Applied
Relative
Accuracy>?
Absolute
Accuracy**
;tZOO.OOuA
199.78
to 200.22uA
199.77
to
200.23uA
*2.0000mA
I.9978
to 2.0022mA
1.9977
to
2.0023mA
+-20,OOOmA
19.978
to 20.022mA
19.977
to
20.023mA
i-200.00mA
0.19978
to
0.20022A
0.19858
to 0.20142A
+2.0000A
1.9958
to 2.0042A
1.9838
to
2.0162A
"Does
not
include
the
uncertainty
of
the
CurrentSource.
""Does
include
the
uncertainty
of
the
Current
Source.
9.
Current
Accuracy
Check
(Model
172 only)
I .
DC Current
a)
Set
to
DC Amperes
b)
Set
to AUTO.
C)
Connect
Current
Source
(E)
to
the
instrument
input
terminals.
d)
Set
the
Current
Source
to
200mA.
Verify
a reading
of
199.48
to
200.52mA.e
d
Set
the
Current
Source
to
the
IA.
Verify
a reading
of
0.9973
to
1.0027A."
*NOTE
Readings
do not
account
for
source
inaccuracy.
Add 0.02%
uncertainty
if
Current
Source
(E)
is
used.
cc
6-7
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