AMI Analyzer Manual
Installation Procedure
14
13. Verify the analog output is correct and connect it.
Figure 4. Output selection switch positions
This unit is equipped with a selectable analog output. It may be either 1-5V or 4-20mA, selectable via a
switch on the output PCB (the board directly under the cover plate in the explosion proof housing). The
positioning of the switch is indicated on the PCB itself – put switch one position for 4-20mA, and put it the
other for 1-5V. The 4-20mA option will increase the current draw by up to 50mA, if the unit is powered
from DC. Note that if you change the position you will have to recalibrate the output using the AMI
software.
The output 4-20mA circuit is capable of driving a 600 Ohm load, while the voltage output needs at least a
10,000 Ohm load. Either will saturate at more than 125% of the nominal full scale range.
Using AMI software you can set the output to 4mA, 12mA and 20mA (or 1V, 3V and 5V), and adjust the
internal settings to calibrate these values so as to get the most accurate possible transfer of information to a
recording or computing device. If you leave a box checked so the output is at some value, like zero, the unit
will automatically return to its normal operation after ten minutes.