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Operating Manual
MHM-97442
R
depending on the interpulse period. Use the following formula to calculate the
max
interpulse period from the signal frequency f
T
Pause
Example with input signal frequency f
T
Pause
Use the diagram in
calculated interpulse period . A interpulse period of T
maximum resistance of 50000 Ω. If the actual input resistance R
correct it by switching another resistance R
Calculate such parallel resistance with the following formula:
R
Parallel
Example with R
R
Parallel
To meet the requirements for the input resistance from the example above, connect a
resistance of approximately 100000 Ω in parallel to a pulse input with an input resistance
= 100000 Ω. So, the total resistance is reduced to approximately 50000 Ω.
R
i
The typical minimum input resistance is about 2000 Ω.
MHM-97442, Rev. 2.06
= 1/2f
Input
= 1/2*1600 Hz = 0.0003125s = 0.3125 ms
Figure 4-20
= 1/((1/R
) - (1/R
))
max
i
= 50000 Ω and R
max
= 1/((1/50000 Ω) - (1/100000 Ω)) = 100000 Ω
.
Input
= 1600 Hz:
Input
to determine the maximum input resistance with the
Pause
in parallel to the input (see
Parallel
= 100000 Ω:
i
Installation and commissioning
February 2023
= 0.3125 ms results in a
should be greater,
i
Figure
4-21).
45
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