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3-13
3.9
Resolution Control Selection
3.9.1
The 2251A provides a selection of resolution for frequency and time interval. In frequency,
the resolution or number of digits displayed is related to the gate time. Refer to Section 1,
Specifications for a description of the relationship between resolution, LSD, and accuracy.
In Time Interval, all measurements result in 1 nanosecond LSD.
However, the least
significant digits can be truncated for display using the SRS command.
3.9.2
Table 3.10 provides the 2251A resolution control selection.
Table 3.10 - Resolution Control Selection
Command Code To
Number of Selected,
Select Resolution
Digits in Frequency,
Number
of Digits
Period
Ratio, and Check
Gate Time
SRS 10
10
10 s
SRS 9
9
1 s
SRS 8
8
100 ms
SRS 7
7
10 ms
SRS 6
6
1 ms
SRS 5
5
1 ms
SRS 4
4
1 ms
SRS 3
3
1 ms
NOTES:
1.
The most significant digit is permitted to exceed the resolution by 1
digit providing a 10% overrange. This precludes unnecessary shifting
of digits.
2.
Measurements of frequency, period, ratio, and check are averaged
when these gate times are set if period of signal is less than
programmed gate time.
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Содержание 2251A
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