Changing Analog Channel Scaling References - DPS Telecom NetGuardian 216 User Manual

Note : The descending configuration is useful for monitoring battery voltage. In the descending configuration a 0
volt reading will alarm as a major under (MjU).
The jumper inserts a 250 ohm shunt resistor across the input to convert the sensors current output to volts. Use
ohms law to find the voltage drop across the 250 ohm shunt resistor (multiply the current by the resistance 250
ohms). Please refer to the operation manual for your sensor to determine any other conversion factors. This will
allow you to correctly set the thresholds for over and under conditions.

5.10.1.1 Changing Analog Channel Scaling References

Follow these steps to change the scaling reference of your analog channels:
1. From the Editor Mode, select the Analogs tab.
2. Enter a description for each analog channel being utilized.
3. Select Yes to designate traps, or No to not designate a trap for each analog (Default trap setting is Yes).
4. Click on the Change button to configure the reference units and the actual units for that Analog Channel.
5. Set reference 1 (VDC) to the minimum output (in volts DC) of the analog device being configured.
6. In the box next to the Actual units setting, enter an abbreviation for the actual units; for example, RH for
relative humidity, F for Fahrenheit, etc.
7. Enter the actual unit that corresponds to the minimum output entered in the previous step in the actual unit
field.
8. Set reference 2 (VDC) to the maximum output (in volts DC) of the analog device being configured.
9. In the box next to the actual units setting, enter an abbreviation for the actual units, for example RH for
relative humidity, F for Fahrenheit, etc.
10. Enter the actual unit that corresponds to the maximum output entered in the previous step in the actual unit
field.
11. Follow these steps for each Analog Channel being configured.
Fig. 5.21 Reference 1 and Reference 2 correspond to the calibration reference points of your analog device
If the input voltage is 0-5 V, the input will read in increments of .0015 V.
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