Racal Instruments 2251A Operator's Manual page 16

1.5.3 Measurement Functions
1.5.3.1 Frequency A & B
Range:
LSD:
Resolution:
Accuracy:
1.5.3.2 Frequency C (Option 41)
Range:
LSD:
Resolution:
Accuracy:
1.5.3.3 Period A
Range:
LSD:
Resolution:
Accuracy:
* Refer to Notes and Definitions
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Input A: 6 x 10 Hz to 200 MHz
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Input B: 3 x 10 Hz to 160 MHz
(1 ns / Gate Time) x Freq
±(2 x LSD)±1.4 x (Trigger Error*/Gate Time)
x Freq
± Resolution ± Timebase Error x Freq
40 MHz to 1.3 GHz
(1 ns/Gate Time) x Freq
(1 ns/Gate Time) x Freq
± Resolution ± Timebase Error x Freq
3
5 ns to 1.7 x 10 sec
(1 ns / Gate Time) x Period
± (2 x LSD) ± (1.4 x Trigger Error*/Gate
Time) x Period
± Resolution ± Timebase Error x Period
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