3.4 Setting Configuration 2 – Input Channel Settings
55
3
3
Chapt
er
3 Sett
ing be
fore M
easure
ment
Revolution Measurement Theory
Pulse count is measured using the Memory 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 num-
ber of pulses per revolution.
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 (rps) at
t
=2s (
r
t=2
) can be obtained.
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
between (
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.
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
[rps] =
(rps: Revolutions per second)
r
t=2
=
4
2000
1000
= 250 [rps]
Pulses per revolution
Pulse count at
t
s
minus pulse count at (
t
-0.01)
s
r
[rps] =
x 100
Содержание LR8431
Страница 1: ...EN LR8431 20 MEMORY HiLOGGER Instruction Manual Aug 2015 Revised edition 3 LR8431B980 03 15 08H...
Страница 2: ......
Страница 20: ...Operating Precautions 12...
Страница 44: ...2 5 Zero Adjustment 36...
Страница 74: ...3 7 Viewing All Channel Settings in a List 66...
Страница 88: ...4 5 About Recording Operation 80...
Страница 120: ...6 6 Transferring Data to a Computer USB Drive Mode 112...
Страница 126: ...7 2 Numerical Value Calculation Expressions 118...
Страница 136: ...8 3 Making System Settings 128...
Страница 144: ...9 5 Synchronous Measurements with Multiple Instruments 136...
Страница 154: ...Chapter 10 Specifications 146...
Страница 198: ...Appendix 11 Pulse Input Circuit Diagram A40...
Страница 202: ...Index Index 4...
Страница 203: ......
Страница 204: ...EN LR8431 20 MEMORY HiLOGGER Instruction Manual Aug 2015 Revised edition 3 LR8431B980 03 15 08H...