- tune R5 for minimium current loop value to 4 mA
- ture R2 for maxmium current loop value to 20 mA
check LED brightness to get visual feedback of the current
DC 9-36V input
read current value on the right side
Tune Calibration V2
- prepare a trim pot, tune to maximium level, for example a 1K trim pot, one side 0R, another side 1K
- please follow the step below
- a current meter is helpful to check the right side output current
| step | action on | target |
|---|---|---|
| 1 | RIGHT side on board trim pot | 20 mA |
| 2 | LEFT side on board trim pot | 4 mA |
- now you can tune the input resistance to check output current
- notice active input resistance are the middle and bottom pins (left side terminal)
legacy steps for calibration V1
- Attached an external trim-pot 10K for tuning
- Tune to minimium resistance for "zero" 4mA:
- Tune the external trim-pot marked side to minimium
- and then tune the on-board marked trim-pot to 4mA
- Tune to maximium resistance for 20mA
- Tune the external trim-pot marked side to maximium
- and then tune the on-board marked trim-pot to 20mA
- Replace the external trim-pot with your sensor
demos
- https://twitter.com/electro_phoenix/status/1651909594900467712