Cascade Crew

iansane · Posted: Wed May 09, 2007 10:15 pm Post subject: How would I measure....

the output of a VSS w/ a DVOM?

Since popping the t56 back in I haven't had a working speedo. SGI-5 Box is getting good power and good ground. I messed up the connector to the VSS when yanking the trans one of the many times so it might also be that but I'd like to slap a DVOM on the input and output terminals to measure the supposed 2k ppm or whatever it should be but what settings should I put it on?

chevymad · Posted: Wed May 09, 2007 10:31 pm Post subject:

I believe its an a/c voltage. Unless memory's playin tricks.. and its dc.. but ya.. going with A/C.

iansane · Posted: Wed May 09, 2007 10:48 pm Post subject:

The options are hard to make out but the AC selections are in the upper right and it had 500 and 200.

Which do you think would work better?

alloy · Posted: Wed May 09, 2007 10:56 pm Post subject:

Nice meter........you get it when were selling them for $1 each I hope??

iansane · Posted: Wed May 09, 2007 11:11 pm Post subject:

Well when they were a hair over two dollars, yeah!

alloy · Posted: Wed May 09, 2007 11:22 pm Post subject:

Good.......I think I got 3-4 of them myself Very Happy

I'm always looking at the clearance report to see what I can grab Wink

blue89 · Posted: Thu May 10, 2007 6:49 am Post subject:

It should be AC Sinewave (multimeter should work fine) but it needs to be on a small scale. It would be better to measure the frequency instead of the voltage. The voltage should be no more than around 5Vac, but the frequency is what changes. Should be 2000 or 4000 pulses per mile.

Al Hasse · Posted: Thu May 10, 2007 8:59 am Post subject:

2000 or 4000 pulse per mile isn't a very high frequency. At 60mph, 4000 pulse per mile is 4000 pulses per minute or about 67Hz.

iansane · Posted: Thu May 10, 2007 9:53 am Post subject:

I feel like santa's little helper from the Simpson's. Mop mop mop mop mop mooop. I can see what you guys are saying but I make no connection to how I can visualize that on my tool. Very Happy

Either way, I think my SGI 5a box is bad. I get a signal in, a sporatic .5 something when I've got it at AC 500, and nothing at all when it's on the signal out terminal.

BigDaddyVu · Posted: Thu May 10, 2007 10:00 am Post subject:

a scope is easier.

blue89 · Posted: Thu May 10, 2007 10:37 am Post subject:

I was hoping you would chime in Al. But ya, unless he runs a true RMS meter it will be insensitive to anything but 60hz. Frequency measurement would be the easiest way to see if it functions. however, a simple check of sensor resistance would probably be ample? Its just a magnetic pickup sensor so it should have resistance if it works, open if broken. I'm just speculating.