GSE 60 SERIES Technical Reference Manual page 466

12-20 Chapter 12
Table 12-7: Calculated Error Times with Known Input Signal Frequency or Period
Input
Frequncy (Hz):
Number of
Periods
GSE Scale Systems
Figure 12-4: Phase Time (The Period)
The accuracy of phase time measurement is similar to the accuracy shown
for the 'FqInB' function. However since we are measuring time instead of
frequency, we will present the error equations in terms of time.
=
ErrorTime
ClockPerSecond
Then if the frequency or period of the input signal is known, the error may be
calculated as a percentage of the maximum value of the phase time, i.e. the
period. See Figure 12-4. Also refer to Table 12-7.
Error Time
(micro- Uncertainty (expressed as a percentage of signal's period)
seconds)
1 1.907 0.00191%
10 0.191 0.00019%
25 0.076 0.00008%
50 0.038 0.00004%
100 0.019 0.00002%
200 0.010 0.00001%
250 0.008 0.00001%
D
ELAY
These functions allow an output pulse to be generated that has a
programmable width and occurs a programmable delay after an incoming
signal. In order to use this feature, one channel (channel 7 or lower) must
be programmed to use the 'DlyIn' (Delay In) function. The next channel is
then locked to be 'DlyOt' (Delay Out). Additional Delay Out channels that
use the same Delay In signal may be programmed at adjacent channels.
For example if channel 3 is programmed to be 'DlyIn' then channel 4 will
automatically be set to 'DlyOt'. Channel 5 could then also be set as
'DlyOt' and it would reference the input signal of channel 3. If channel 5
were set to 'DlyOt' then channel 6 could also be 'DlyOt' and so on. Figure
12-5 shows the relationship between the input and output signals.
The 660 allows "Delay Out" type PDIO channels to be gated by their
respective setpoint. I.E. a setup parameter of delay out (P855) is "Stpt"
and the choices are "Ignrd" and "Gated". Default is "Ignrd" and in this
case the PDIO channel would continue to work as it has. However
enabling this parameter would cause the PDIO output to go to its de-active
state whenever the associated setpoint is off and work normally when the
setpoint is on. This feature is essential for the SCR control option. The
1
×
NumberOfPeriods
10 100
0.01907%
0.00191%
0.00076%
0.00038%
0.00019%
0.00010%
0.00008%
I , D O
N ELAY UT
1
=
×
524 288 ,
1000 10000
0.19073% 1.90735%
0.01907% 0.19073%
0.00763% 0.07629%
0.00381% 0.03815%
0.00191% 0.01907%
0.00095% 0.00954%
0.00076% 0.00763%
(F 6 & 7)
UNCTIONS
µ
1 91 . Sec
=
.
P 860 P 860
50000
9.53674%
0.95367%
0.38147%
0.19073%
0.09537%
0.04768%
0.03815%