Computer control is accomplished using the standard RS port and optional application software. Both modes of operation utilize the front panel LED display. The Non-Monitoring state turns off the LED display for lower noise applications and to minimize power consumption. In the Programming Mode, the unit is ready for manual programming of existing channel setups.
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However, armed with a few simple rules and some basic knowledge of these popular signal conditioners, it becomes really quite simple. The most basic rule, but perhaps the most misunderstood, is that the user cannot actually set the gain of the amplifier directly.
The second rule, also frequently misunderstood, is that these amplifiers do not concern themselves with mechanical engineering units i. The only uses mV. The advantage of this, however, will become clear with some explanation.
What the user does set is the input sensitivity from the input transducer, and the desired output scale factor. The amplifier then determines what gain is necessary to meet these parameters.
This frees the user from having to calculate gains, and offers a tremendous amount of flexibility in the output scale factor that can be set. So, how to begin? Step 1 is to determine the sensitivity of the accelerometer being used. This can usually be found on the calibration certificate that came with the sensor.
If not, contact the manufacturer for further information. This step is usually straightforward. The next step is a bit more complicated. Rather than programming gain, the user will program the output scale factor. In this case, the amplifier is only using a gain of 1.
A better and more realistic example is this: the input accelerometer has a sensitivity of 9. Another way to approach programming output scale factor is to consider what the output full scale voltage may need to be from the amplifier. Some DAQ systems may even require this. For example, say that the DAQ system needs 1 V full scale.
The user in this example knows to expect no more than 2 g maximum in their measurement. What would the output scale factor be in this case? Back to ask the experts.
Endevco 133 3 Channel PE/Isotron Signal Conditioner