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8 channel tc-08 thermocouple (Read 211 times)
jarvissamuel
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8 channel tc-08 thermocouple
Dec 12th, 2004 at 6:29pm
 
On the pico website their new product is the usb 8 channel thermocouple data logger. It lists a 20 bit resolution?  Eight channels huh?  Could this be used as slower type scope to observe several channels?  It looks like it capable of 100ms a division at is fastest speed.   I realize it is datalogger for thermocouples but it lists a voltage protection of +/- 30 volts with a common mode voltage of +/-7.5 volts.  If I read correctly the thermocouples produce a voltage in correlation to heat.  It seems like it might work although in some situation attuenators would be needed.

Of course it could always be used for what it was designed for logging temperatures.  Some of the A/C guys are using temperature for diagnosing A/C systems with this almost all the important temperature points could be observed at the samte time with the system operating.  The prices for the tc-08 and the thermocouples seem to be vary fair.   Buying all the components would still be less than one of those fancy A/C computers you clamp on the lines. Tom is something you could get if anybody was interested?

The question I did have come to mind seeing this is there more than a 2 channel 212 in the works or may be at least some software so 2 adc's could be run on one computer to effectively creat a 4 channel scope?  I suppose this could be accomplished right now with 2 adc's and 2 computers with both set to an external trigger.  I know we usually only need 2 channels but sometimes more than 2 can be helpful. 

So any thoughts good/bad otherwise or other possible uses for this?

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Tom Roberts
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Re: 8 channel tc-08 thermocouple
Reply #1 - Dec 13th, 2004 at 7:25am
 
Hi Samuel,

I am not familiar with this product but I think you have hit on some practical automotive application with AC work, for the TC-08.

Sure, I can get anything Pico has for you.  I only stock the 212/3 and 50 in automotive kits, so other stuff would be a special order.  Just might delay delivery some.

On running two 212 units:
PicoScope cannot do this because you can only have one PicoScope instance running on your PC at the same time.  The EASE software can do this, but I would not recommend it.  See EASE PC Scope Testing:

http://www.autonerdz.com/cgi/yabb2/YaBB.pl?board=picopub;action=display;num=1086...

In any case, you can not make a four channel.  You can make two, two channel scopes.  The channels will never be in sync between the two units.  The drivers can only address one unit at a time.

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« Last Edit: Oct 5th, 2006 at 8:22am by Tom Roberts »  

Tom Roberts
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jarvissamuel
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Re: 8 channel tc-08 thermocouple
Reply #2 - Dec 13th, 2004 at 8:06am
 
Thanks Tom I have seen your testing on the ease.  I have not researched ease scope prices nor do I care to I have looked at there scannner stuff put it is pricey for everything I imagine the scope is similar.

On two adc's on two seperate computers ran a seperate adc unit and both were set to an external trigger both  using the same external trigger they would not be synced?
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Tom Roberts
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Re: 8 channel tc-08 thermocouple
Reply #3 - Dec 13th, 2004 at 8:30am
 
Hi Samuel,

They might not be synced because they may trigger off of different trigger events.  You may have them both on the same trigger, and they may APPEAR to be synced.  It would happen like this:

PC #1 triggers, collects data, transfers data, re-arms, and waits for the next trigger.  PC #2 may not be on the same schedule, for many reasons, and may trigger off of a different trigger event.

Unless you set up a single trigger and both PCs were waiting for it when they received it, you could not be sure they were on the same event.  If you were on repeat trigger, the units could be out of sync.

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