LED light for driver output visualization?

[Moneil]

We have nitrogen dosing units. A PLC sends an output to a driver that sends power to a coil. The driver also pulls current away from the coil after a giving time duration to allow the coil to close the valve wuickly.

We are able to see the 6 millisecond output signal from the PLC to the driver via an analog output wired to our high speed camera LCD display. We want to see whats is going on with the voltage and current going to the coil from the driver, but the voltage is too much for our signal box (converts the signal to something the camera can see). Is there an LED light that can withstand 170 volts for 4 ms and then 22 volts for the remaining 2 ms? I want to wire it in paralell so we could see it light up on the high speed to see if the coil is getting what it should be getting.

or maybe there is an inexpensive oscilloscope that has an analog output? Any help is appreciated.

 

[Moneil]

Ok, realized i had some grammatical errors in my first post. I am in a hurry this morning, sorry

 

[itsmoked]

Is this DC or AC?

You can use a resistor to limit the current thru the diode given whatever voltage you have to drive it. The resistor must have a power capability to dissipate the resulting power.

If you are talking AC you must put a shunt diode in reverse to the LED diode or you will get a fatal avalanche breakdown of the LED on the first reverse polarity of the AC signal.

Keith Cress
kcress -

http://www.flaminsystems.com