Simcenter Testing Solutions How to determine the sensitivity of the output from a VCF4 / VD8MO
2023-01-12T13:26:58.000-0500
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Summary
In case an output (monitor) channel from a VCF4 or a VD8MO needs to be connected, for example to a control system, it is important to know the sensitivity of the applied signal
Details
How to determine the sensitivity of the output from a VCF4 / VD8MO
In case an output (monitor) channel from a VCF4 or a VD8MO needs to be connected, for example to a control system, it is important to know the sensitivity of the applied signal.
In case of a VCF4, the output channels are diverted from the input section after amplification (fig.1) This means that the output sensitivity is not equal to the input signal.
Fig.1
With the given fact that the maximum output from a VCF4 is 10V,
the sensitivity can be calculated with the following formula: Max output x sensor sensitivity
Input range
As an example, if you have an accelerometer with a sensitivity of 95pC/g and an input range of 1000pC,
The sensitivity will be: 10Vx 95pC/g = 0.95V/g or 950mV/g
1000pC
In V/ICP mode the same formula is applicable. In case you have a sensor sensitivity of 100mV/g and an input range of 2 V you will get a sensitivity of 10V x 100mV/g = 500mV/g.
2V
In case of a VD8MO it is simpler, the output channel is directly diverted from the input (Fig.2).
Fig.2
This means that the same sensitivity can be used as that is used for the input channel.
In case of a VCF4, the output channels are diverted from the input section after amplification (fig.1) This means that the output sensitivity is not equal to the input signal.
Fig.1
With the given fact that the maximum output from a VCF4 is 10V,
the sensitivity can be calculated with the following formula: Max output x sensor sensitivity
Input range
As an example, if you have an accelerometer with a sensitivity of 95pC/g and an input range of 1000pC,
The sensitivity will be: 10Vx 95
1000
In V/ICP mode the same formula is applicable. In case you have a sensor sensitivity of 100mV/g and an input range of 2 V you will get a sensitivity of 10
2
Fig.2
This means that the same sensitivity can be used as that is used for the input channel.