Fluke 9640A Series, Инструкция по эксплуатации

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Calibration
Performance Test
5
5-5
Typical examples of the AC Measurement Standard listed in Table 5-1 may exhibit a
slight noise floor related non-linearity on the lowest (2.2 mV) range which can increase
the uncertainty of the tests or adjustments unless a correction is applied. The 2.2 mV
range linearity error may be easily determined by comparison with the linearity of the
higher ranges where no significant non-linearity exists.
It is recommended that users familiarize themselves with the procedures documented in
this chapter, which indicate when these power sensor and AC Measurement Standard
characteristics must be taken into account.
It is also recommended that users familiarize themselves with the detailed operation of
the equipment listed in Table 5-1 by reading the relevant manufacturer’s instructions and
manuals.
Performance Test
The performance test is a series of tests based on the published 1-year specifications for
the Instrument. Environmental and warm up conditions required for performing the
performance test are as follows:
•
Ambient temperature of the test environment is 23 ± 1 °C.
•
Warm up time (continuous operation) for the Instrument, with all covers in place, is 1
hour (24 hours for testing the accuracy of the Reference Frequency and Output
Frequency).
Each of the following tests is accompanied by a list of the equipment required to perform
the test and a figure detailing the equipment connections for the test. Perform the tests in
sequence, ensuring that all prior equipment connections have been removed prior to
starting a new test. It is recommended that tests indicated as optional be performed
following repair, but are not essential for routine verification. For certain tests, the
uncertainty of the recommended equipment is significant and must be taken into account
when determining compliance with published specifications. A Performance Test Record
is provided at the end of this chapter to facilitate the recording of results, and where
necessary, accounting for the uncertainty of the measurement equipment. It is
recommended that the Performance Test Record pages are photocopied and then used to
record results as the tests are performed.
W
Caution
To prevent damage to the Leveling Head assembly and
adapters, make sure the dimensions of the connectors match
prior to mating. The center conductor (pin diameter) of 75
Ω
connectors differs significantly from those of 50
Ω
. Mating a
50
Ω
male with a 75
Ω
female will DESTROY the female contact,
causing costly damage to the Leveling Head assembly as well
as the adapters, while mating a 75
Ω
male with a 50
Ω
female
will result in a poor electrical connection.
W
Caution
Tighten/loosen all RF connectors by turning the collar, not the
body. Rotating the connector body will damage the center pin,
causing expensive damage, as well as seriously deteriorating
measurement results.