4
Performance Verification
4-1
4.1
Introduction
The procedures in this section are intended to verify that
Model 1801 accuracy is within the limits stated in the
preamplifier one-year specifications (see Appendix A).
These procedures can be performed when the unit is first
received to ensure that no damage or misadjustment has
occurred during shipment. Verification may also be per-
formed whenever there is a question of preamplifier accu-
racy, or following calibration, if desired.
WARNING
The procedures in this section are in-
tended only for qualified service per-
sonnel. Do not attempt to perform
these procedures unless you are quali-
fied to do so.
NOTE
If the preamplifier is still under warran-
ty, and its performance is outside speci-
fied limits, contact your Keithley
representative or the factory to deter-
mine the correct course of action.
This section includes the following:
4.2
Environmental conditions:
Covers the tempera-
ture and humidity limits for verification.
4.3
Warm-up period:
Describes the length of time the
Model 1801 should be allowed to warm up before
testing.
4.4
Line power:
Covers power line voltage ranges dur-
ing testing.
4.5
Recommended equipment:
Summarizes recom-
mended equipment and pertinent specifications.
4.6
Verification limits:
Explains how reading limits
were calculated.
4.7
Restoring factory default conditions:
Gives step-
by-step procedures for restoring default conditions
before each test procedure.
4.8
Verification procedures:
Details procedures to ver-
ify measurement accuracy of Model 1801 measure-
ment functions.
4.2
Environmental conditions
DC voltage verification measurements must be made at an
ambient temperature of 23 ±1°C, and at a relative humid-
ity of less than 80%. (Although the Model 1801 could
normally be tested at 23 ±5°C, the low-thermal voltage
divider used for DCV verification must be operated at 23
±1°C to meet its stated specifications.) AC voltage verifi-
cation measurements must be made at an ambient temper-
ature of 23 ±5°C, and at a relative humidity of less than
80%.