CIM->Victor 884->Arduino not working

[Ether]

500 ma seems way too high. You might even have damaged the opto-isolator's emitter.

I've never been able to find a Victor schematic, but the datasheet for the Jag's opto-isolator says it has an absolute maximum continuous current rating of 60 ma for the input.

The cable I am using for my test equipment here delivers about 5.6 ma to the Victor during the pulse, and it works fine.

Can you post a picture of your scope's current waveform?

[jamie_1930]

Originally Posted by Ether

500 ma seems way too high. You might even have damaged the opto-isolator's emitter.

I've never been able to find a Victor schematic, but the datasheet for the Jag's opto-isolator says it has an absolute maximum continuous current rating of 60 ma for the input.

The cable I am using for my test equipment here delivers about 5.6 ma to the Victor during the pulse, and it works fine.

Can you post a picture of your scope's current waveform?

I won't be able to get back into the school till later tonight or tomorrow, but I'll get that to you as soon as i can. Next time i'll try putting a larger resistor in line to lower the current down to 50mA and see if that changes anything. I just hope i haven't damaged the victor.

[Ether]

Originally Posted by jamie_1930

Next time i'll try putting a larger resistor in line to lower the current down to 50mA

50 ma is still way too high.

In the Jag's opto-isolator, there's a 150 ohm series resistor. In the DSC, there's a 330 ohm series resistor in the PWM signal output. Total 480 ohms. Do the math. 11 ma should be enough.

I just measured a Vic I have here. With 1.5 VDC applied to the input, the current is 0.00562 amps. Subtract 0.7 volts for the LED (I think?) and use R=V/I = (1.5-0.7)/0.00562 = 142 ohms series resistor. So it seems to be similar to the Jag.

[tr6scott]

FYI, that Altoids Can ran the old victors, and currently running Jags without issue. I have not tried with Talon, or the new Victor.

[BitTwiddler]

That's what I got on the o scope. I put a 10 ohm resistor in line with the signal wire and took the voltage above and below the resistor then hooked the other channel on the o scope to a constant 0.1v and used the math function to multiply the channels

Forgive me for asking the obvious question but are both probes set to the same gain (x10, x1)?