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MAIN
I IzNANGC
TABLE 6-5.
DC Current
Accuracy
Check
(Model
173A Only).
RANGE
CURRENT
NOMINAL
APPLIED
DISPLAY
TOLERANCE (SPECIFIED
SOURCE
ACCURACY)
IN DIGITS
ERROR"
2o"
to
3O'C
300 A
i200.00
A
200.00
~22 digits
+I digit
3mA
+2.0000mA
2.0000
+22 digits
+I digit
30mA
i20.000mA
20.000
+22 digits
-rl digit
300mA
+200.00mA
200.00
k22 digits
+4 digit
3A
i2.0000
A
2.0000
t22
digits+*
?4 digit
;k
Manufacturer's
specified
uncertainty
for
Current
Sources
(E).
If
these
sources
are
used,
add uncertainty
to Tolerance
to obtain
allowable
reading.
*A Self
heating
effects
of
currents
greater
than
I ampere
can double
the
percentage
of
reading
error
(i.e.,
prolonged
application
of
>lA
can cause
tolerance
to
increase
to +42 digits).
g.
Current
Accuracy
Check
(Model
172A Only).
I)
Select
DC and A.
2)
Select
AUTO.
3)
Connect
Current
Source
(E)
to
the
instrument
input
terminals.
4)
Set
the
current
swrce
to 200mA.
Verify
a reading
of
199.48
to 200.52mA*.
5)
Set
the
current
source
to
IA:
Verify
a reading
of
0.9373
to
l.O027A;*.
"NOTE
Readings
do not
account
for
source
inaccuracy.
Add 0.02%
uncertainty
to
read-
ing
if
Current
Source
(E)
is
used
(i.e.,
+4 digits
to step
4 and f2 digits
to
step
5).
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