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4-1
SECTION 4
PERFORMANCE VERIFICATION
4.1
Performance Verification Procedures (PVPs)
4.1.1
This section provides the procedures necessary to verify that the 2251A conforms
to its published specifications. It is recommended that these procedures are carried
out at a minimum interval of one year.
4.1.2
The following conditions must be kept throughout the Verification Procedure.
a) The instrument covers must be fitted.
b) The ambient temperature must be 23 C ± 2 C
o
o
c) The counter must be allowed to warm up for at least one hour before commencing
the PVPs.
4.1.3
In the following procedures, a stable count is defined as one that does not vary by
more than ± one count in the least significant digit of resolution between successive
readings.
4.1.3.1
Note that these procedures verify the measurement circuitry of the counter but not the
absolute accuracy. Absolute accuracies must be calculated from the expressions given
in the Specifications section of this manual after finding the timebase errors that
apply to the external frequency standard or CLK10 signals used by the counter.
4.1.4
Required Test Equipment
4.1.4.1
Signal Generator, 10 kHz to 1.3 GHz, Racal Instruments 9087
4.1.4.2
Function Generator, DC to 10 kHz, HP 3325
4.1.4.3
DC Voltage Calibrator, Fluke 332A
4.1.4.4
Digital Multimeter, ± 5% Accuracy, DC to 100 kHz, Racal Instruments 5001
4.1.4.5
RF Millivoltmeter, Racal Instruments 9303
4.1.4.6
Various RF connectors, adaptors, T-pieces and coaxial cables, as required.
NOTE
In the following procedures, it is recommended that all signal levels are measured
with the Digital Multimeter or RF Millivoltmeter, as appropriate, and adjusted to
give a level as close to its nominal value as can be achieved before being applied to
the counter.
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Содержание 2251A
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