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4-2
4.1.5
Diagnostic Special Functions
4.1.5.0.1
It is recommended that the following Special Functions are enabled in turn in the
check mode and the results noted before commencing the Performance Verification
Procedures for the counter. Successful completion of this procedure demonstrates
that the 2251A measurement circuitry is functioning correctly.
S70
Frequency Measurement Check. Expected result: CK+10.00006
S72
START TEC Short Calibration.
S73
START TEC Long Calibration.
S74
STOP TEC Short Calibration.
S75
STOP TEC Long Calibration.
S77
Input A relays check
S78
Input B relays check.
The expected results for S73 and S75 are 800 ± 220. The expected results for S72
and S74 are (S73 result) / 2, tol20, -40 and (S75 result) / 2, tol 20,
-40, respectively.
For S77 and S78 tests, it is necessary to input a 10MHz square wave signal with
amplitude of a positive peak b.8V and +1.0V, and a negative peak between
-.2V and -.4V
6
. A successful completion of the relays results in an output of
CK+0000000000.0E000. Error Codes are described in Section 3.4.
4.1.5.0.2
Check mode Special Functions S72 - S78 may be exited by selecting S70 (Basic
Check function) or any other measurement mode.
4.1.5.3
Special Functions S77 and S78 require a time delay between initiation of check and
reading of data. S77 requires a 9 second delay and S78 requires a 1 second delay.
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Содержание 2251A
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