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