Hioki LR8410-20, Инструкция по эксплуатации

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3.3 Input Channel Settings
85
3
3
Chapt
er
3 Sett
ings
Use the scaling function to display integrated pulse counts as the corre-
sponding physical units (such as Wh or VA) of the measurement param-
eter
(p. 95).
Revolution Measurement Theory
Pulse count is measured using the Memory HiLogger's internal 100 ms sampling interval.
The revolution rate (r) per second during time t [s] is obtained by dividing the number of pulses
from (t-1) to t [s] by the number of pulses per revolution.
0 100 ms 200 ms 1 s 2 s
Pulse Count
P20 P10 P2 P1 0
Pulses per revolution
Pulse count at t
s
minus pulse count at (t -1)
s
r [r/s] =
(r/s: Revolutions per second)
Example: Pulses per revolution = 4
When the number of pulses counted in one second is P
10
= 1000 c,
and the number of pulses counted in two seconds is P
20
= 2000 c,
then the revolution rate (r/s) at t=2s (r
t=2
) can be obtained.
r
t=2
=
4
2000

1000
= 250 [r/s]
Exception: When time t
s
is less than one second
The pulse count at (t -1)
s
(whole seconds) cannot measured, so 10 times the pulse count be-
tween
(t -0.1)
s
and t
s
serves and the pulse count for one second to obtain the revolution rate.
As a result, revolution measurements when t is less than one second are scattered.
Pulses per revolution
Pulse count at t
s
minus pulse count at (t -0.1)
s
r [r/s] =
x 100