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Performance Verification
1.3
Warm-up period
The Model 6517A must be allowed to warm up for at least
one hour before performing the verification procedures. If
the instrument has been subjected to temperature extremes
(outside the range stated in paragraph 1.2), allow additional
time for internal temperatures to stabilize. Typically, it takes
one additional hour to stabilize a unit that has been in an
environment 10°C (18°F) above or below the specified tem-
perature range.
The test equipment should also be allowed to warm up for
the minimum period specified by the manufacturer.
1.4
Line power
The Model 6517A should be tested while operating from a
line voltage within the range determined by the rear panel
LINE VOLTAGE switch setting, at a frequency of 50 or
60Hz.
1.5
Recommended test equipment
The following paragraphs list test equipment recommended
for performing the verification procedures for the various
Model 6517A functions. Alternate equipment may be used
as long as that equipment has specifications comparable to or
better than those listed in the table.
Make all input low connections directly to
the triax INPUT connector instead of us-
ing COMMON to avoid internal voltage
drops that could affect measurement accu-
racy. Use the connecting methods shown
in this section to avoid this problem.
1-2
NOTE
1.5.1 Meter performance verification equipment
Table 1-1 lists all test equipment required for verifying the
measurement accuracy of Model 6517A meter functions.
This equipment will allow you to check the accuracy of the
instrument volts, amps, and coulombs functions.
The Model 5156 Electrometer Calibration
Standard is recommended for verifying
accuracy of the 20pA-2µA amps ranges, the
2G Ω -200G Ω resistance ranges, and all cou-
lombs ranges. Alternate resistance and
capacitance standards may be substituted as
long as those standards are characterized to
an uncertainty at least four times better than
equivalent Model 6517A specifications.
The ohms function and its accuracy are
derived from the voltage source and current
measurement function and their respective
specifications. If both the voltage source and
current measurement function meet their
accuracy specifications, it is not necessary to
independently
verify
accuracy. The ohms verification procedure in
this manual (paragraph 1.9.4) is provided for
those
who
require Artifact
Verification. Because of limitations in high-
value
standard
characterized resistors are required in
addition to the Model 5156 Electrometer
Calibration Standard.
NOTE
NOTE
ohms
function
Standard
resistor
accuracy,
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