Racal Instruments 2251A Operator's Manual page 18

1.5.3.6 Frequency Ratio A / B
Range, Inputs A and B:
LSD:
Resolution:
Accuracy:
1.5.3.7 Frequency Ratio C / B (Only available with Option 41 fitted)
Input C:
Input B:
LSD:
Resolution:
Accuracy:
1.5.3.8 Rise / Fall Time
Range:
Rise Time:
Fall Time:
Input Channel:
Minimum Pulse Height:
Minimum Pulse Width:
LSD displayed:
Resolution:
* Refer to Notes/Definitions
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DC to 100 MHz
(10 X Ratio) / (F x Gate Time)
A
± LSD ± Trigger Error* B / Gate Time
± LSD ± Trigger Error* B / Gate Time
40 MHz to 1.3 GHz
DC to 100 MHz
(640 x Ratio) / (F x Gate Time)
C
± LSD ± (Trigger Error* B) / Gate Time
± LSD ± (Trigger Error* B) / Gate Time
20 ns to 20 ms
Start: + slope, 10 % trigger point
Stop : + slope, 90 % trigger point
Start: - slope, 90 % trigger point
Stop : - slope, 10 % trigger point
Input A
500 mV pp
20 ns at signal peaks
1 ns (100 ps using averaging mode)
± LSD ± 1 ns ± Start Trigger Error* ± Stop
Trigger Error*
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