Holt Integrated Circuits
10
Now decrease the voltage, LED1 and S01 should go off before 4.5V is reached and the screen
should go back to reading 0000.
3.
To measure the Supply/Open thresholds follow the following procedure. Set sensor type to
Supply/Open by connecting a jumper between S and V (pins 2 and 3) on J26. Using a
procedure similar to 1. Connect a supply to the sensor input and adjust to 0V, press key ‘z’ ,
the screen should read ‘0000’ as shown below:
4.
Increase the voltage source up to 10.5V, then increase the voltage slowly, to 12V, LED1 and
LED S1 on the board should be lit, the screen should now read 1000, as shown below:
