PERFORMANCE VERIFICATION
Table 6-3. lldl Accuracy Checks
263
263 Programmed 196
Allowable I96 Reading 196
Range
output Range
(WC to 28OC) Reading
I I
I
I
ml
elk0
.OOOoOkQ
3ka
l.OO---kR 3kQ
cl62 Zero offset
to
(10.04% x PO*) + PO*
*PO = Programmed Output
NOTE
J.f using a DMM that does not have zero correc-
tion capability, record the reading and subtract it
from the reading in step 11 to determine the ac-
tual output of the Model 263.
8. Program the Model 263 to output lkohm (nominal) to
the Model 196.
Using Table 6-4, perform the following steps to check the
zero offsets of the active (AMPS) current source ranges:
9. Record the programmed output reading displayed by
the Model 263 in ‘!hble 6-3.
10. Calculate the allowable reading limits using the follow-
ing equation and record them in Table 6-3.
1. Set the Model 617 to the 2pA range and with an open
input, allow the reading on the display to settle.
2. On the Model 617, press the SUPPRESS button to zero
the display.
Allowable reading = (*0.04% x PO) + PO
NOTE
Where PO = Progammed Output
If using a pica-eter that does not have zero cor-
rection canability, record the zero offset of the
Model 6l7’and s&act it from the subsequent cur-
rent measurements to determine the
actual
out-
put of the Model 263.
Example: Model 263 displays a resistance reading of
1.00025kfL
Allowable reading
= (+0.04% x 1.00025kR) + l.ooO25kR
= *O.O004OkQ+ l.OCQ25khl
= -0.99985OkQ to 1.00065Okhl
11. Verify that the reading on the Model 1% within the
calculated reading limits.
6.6.3
AMPS Zero Offeet Checks
3. Connect the Model 263 to the Model 617 as shown in
Figure 6-2.
4. With the Model 263 on the 2pA range, program it to out-
put .OOOoOpA and verify that the reading on the Model
617 is .OoOO +lOOfA.
5. Using Table 6-4 as a guide, check zero offset of the other
current ranges.
6-4
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