Racal Instruments 2461, User Manual

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User Manual 2461 Type C
A-7
Resolution LSD
14 x TriggerError x Frequency
GateTime
= ± ±
.
(subject to Notes (i) and (ii))
For 6 to 10 Digits:
( )
Resolution 2 x LSD
14 x TriggerError x Frequency
GateTime
= ± ±
.
(subject to Notes (i) and (ii))
BEST CASE RESOLUTION
The following calculations are based upon the assumption that the only contribution to the
input noise is that of the input amplifier. Figures shown are for 9 digits selected (i.e.
nominal gate time = 1s) with sinewave input.
Table 1.1 Frequency 1 - Best Case Resolution (Hz)
Input
Frequency Input Level
50mV RMS 100mV RMS 500mV RMS 1V RMS
10Hz 0.0005 0.0003 0.00005 0.00003
100Hz 0.0005 0.0003 0.00005 0.00003
1kHz 0.0005 0.0003 0.00005 0.00003
10kHz 0.0005 0.0003 0.00007 0.00005
100kHz 0.0007 0.0005 0.0003 0.0002
1MHz 0.003 0.002 0.002 0.002
10MHz 0.02 0.02 0.02 0.02
100MHz 0.2 0.2 0.2 0.2
Accuracy
±
Resolution
±
Timebase Error
×
Frequency
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