5-1
5.1
Introduction
The procedures outlined in this section may be used to verify
that the instrument is operating within the limits stated in the
specifications at the front of this manual. Performance veri-
fication may be performed when the instrument is first re-
ceived to ensure that no damage or misadjustment has
occurred during shipment. Verification may also be per-
formed whenever there is a question of instrument accuracy,
or following calibration, if desired.
WARNING
The procedures in this section are in-
tended only for qualified service person-
nel. Some of the procedures may expose
you to hazardous voltages. Do not per-
form these tests unless you are qualified
to do so.
NOTE
If the instrument is still under warranty
(less than one year from the date of ship-
ment), and its performance falls outside
the specified range, contact your Keithley
representative or the factory to determine
the correct course of action.
5.2
Environmental conditions
All measurements should be made at 18-28°C (65-82°F) and
at less than 70% relative humidity unless otherwise noted.
5.3
Initial conditions
The Model 6512 must be turned on and allowed to warm up
for at least two hours before beginning the verification pro-
cedures. If the instrument has been subjected to extremes of
temperature (outside the range specified in paragraph 5.2),
additional time should be allowed for internal temperatures
to reach normal operating temperature. Typically, it takes
one additional hour to stabilize a unit that is 10°C (18°F) out-
side the specified temperature range.
NOTE
While rated accuracy is achieved after the
two-hour warm up period, input bias cur-
rent may require additional time to settle
to its optimum level. Allow two hours for
input bias current to settle to less than
10fA and eight hours to less than 5fA. It is
preferable in sensitive applications to
leave the unit on continuously.
5.4
Recommended test equipment
The following equipment is needed to verify all measuring
functions of the Model 6512:
• Keithley Model 263 Calibrator/Source (source volts,
ohms, amps, and coulombs).
• Fluke 343A DC Calibrator (190V; ±0.002%).
• 2-slot triax cable (supplied with Model 263).
5
Performance Verification
Summary of Contents for 6512
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