Hioki MEMORY HiLOGGER LR8450 Instruction Manual page 46

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6
Under [Slope], select the slope to count.
7
Under [Threshold], select the level to count.
1 V
4 V
8
Under [Filter], select whether to use the chatter prevention filter.
Set to
OFF
9
Under [Smoothing], enter the smoothing processing time (when
1 s
Principal of rotational speed measurement
Under the following conditions, the integration pulse count is internally updated at a data refresh
interval of 10 ms:
• When the range is
• When the range is
The rotational speed at time t [s] is calculated by dividing the pulse count from (t - 1) to t [s] by the
number of pulses per revolution.
r
(r/s) =
r/s: Rotational speed per second
r (r/min) =
r/min: Rotational speed per minute (with smoothing set to
Example: Number of pulses per revolution = 4
When the range is set to [r/min] and smoothing is set to t
internally updated at a data refresh rate of 50 ms.
The rotational speed at time t [s] is calculated by dividing the pulse count from (t - t
number of pulses per revolution and multiplying the result by 60.
r (r/min) =
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Integrates the number of times the pulse switches from low level to high level (rising).
Integrates the number of times the pulse switches from high level to low level (falling).
Treats voltages that are greater than or equal to 1.0 V as high level and voltages that
are greater than or equal to 0 V but less than 0.5 V as low level.
Treats voltages that are greater than or equal to 4.0 V as high level and voltages that
are greater than or equal to 0 V but less than 1.5 V as low level.
[ON]
to prevent false counting due to chatter in mechanical contact (relay) output.
ON
,
to
60 s
[r/s]
[r/min]
and smoothing is set to
Integrated pulse count at t [s] − integrated pulse count at (t − 1) [s]
Number of pulses per revolution
Integrated pulse count at t [s] − integrated pulse count at (t − 1) [s]
Number of pulses per revolution
Integrated pulse count at 1 s = P1 = 1000 c
Integrated pulse count at 2 s = P2 = 2000 c
The rotation speed at t = 2 s (r
r
= (2000 - 1000) / 4 = 250 r/s
t=2
Integrated pulse count at t [s] − integrated pulse count at (t − t
Number of pulses per revolution
GlobalTestSupply
www.
[1 s]
[1
s])
) can be calculated as follows:
t=2
[s], the integrated pulse count is
0
.com
Configuring Input Channels
[Range]
is set to [r/min]).
× 60
) to t [s] by the
0
) [s]
60
0
×
t
0
sales@GlobalTestSupply.com

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