Hioki LR8400-20, Инструкция по эксплуатации

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3.4 Data Saving Settings
66
Before measuring, select whether to automatically save data to CF card or USB
flash drive while measuring, or to immediately save manually (only when you press
SAVE ).
See Auto Saving (p. 127) and Immediate Saving (p. 130) for setting procedures.
Revolution Measurement Theory
Pulse count is measured using the HiLogger's internal 10 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 10 ms 20 ms 1 s 2 s
Pulse Count
P200 P100 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
100
= 1000 c,
and the number of pulses counted in two seconds is P
200
= 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 100 times the pulse count be-
tween (t -0.01)
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 -0.01)
s
r [r/s] = x 100
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. 71).
3.4 Data Saving Settings