Racal Instruments 2461 User Manual page 173

The resolution of PHASE and TOTALIZE measurements is determined by the input signal.
Measurements of TIME INTERVAL, RATIO, PULSE WIDTH and RISE/FALLTIME have
resolution determined by both the input signal and the resolution set.
Note: a)To avoid unnecessary shifting of digits, the MSD is allowed to exceed the resolution
b) Measurement of FREQUENCY, PERIOD, RATIO and CHECK are averaged when
Note (ii) - Trigger Error
2 + 2
e e
n
i
= seconds RMS
Err
trig
S
trig
Where:
A-14
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Selected number of
digits in Frequency,
(a)
Period and Check
10
9
8*
7
6
5
4
3
* initialized state
by 1 digit for a 10% over range.
these number of digits are selected.
Errtrig = Trigger Timing Error in seconds RMS.
= input amplifier RMS noise (typically 170 µV RMS in 200MHz bandwidth).
e
i
e = input signal RMS noise in 200MHz bandwidth.
n
S = slew rate of input signal at trigger point.
trig
User Manual 2461 Type C
Gate Time
10s
1s
100ms
10ms
1ms
(b)
1ms
(b)
1ms
(b)
1ms