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TC-08

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TC-08

Postby weired » Fri Nov 18, 2011 10:16 am

hi ,
I have a TC-08 with me , after reading through the forum i notice that i can use this as data logger for a load cell.
My questions are :
1) do i have to add in any other instruments in order for me to use the TC-08 with a load cell with 1mV/V output sensitivity?
2)If i use the TC-08 as data logger for the said load cell , can i record data using the same TC-08 from thermocouples at the same time?
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Re: TC-08

Postby Hitesh » Fri Nov 18, 2011 11:43 am

Hi,

You will need a single channel terminal board to plug into one of the inputs on the TC-08 to connect the load cell to - the manual for this can be found on our website:

http://www.picotech.com/document/pdf/DO167-USB-TC08-Terminal-Board-Users-Guide.en-1.pdf

You can also record data from the same TC-08 with thermocouples in the other channels at the same time simply by configuring the channels in PicoLog Recorder.

Regards,
Hitesh

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Re: TC-08

Postby weired » Sun Nov 20, 2011 12:15 am

hi,
ty for the reply.
Does it mean that i can connect my load cell to the TC-08 via the said terminal board and hence to my computer without any external excitation voltage?
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Re: TC-08

Postby Hitesh » Mon Nov 21, 2011 9:18 am

Hi,

If your load cell requires some kind of external voltage to excite it then you will need a separate power supply for it. The single channel terminal board won't output any voltage to anything connected to it - it provides a means for input into the TC-08.

I hope this helps.
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Re: TC-08

Postby giladm » Mon Jan 23, 2012 7:30 am

dear sir/madam

i tried to measure voltage (lower than 70mv) in one of the channels of the TC08, this went ok but the other channels are changing to unreasonable values, so i can't measure both temperature and voltage at the same time. what should i do?

Best Regards
Gilad
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Re: TC-08

Postby Hitesh » Mon Jan 23, 2012 2:35 pm

Hi Gilad,

Is your PC a desktop or laptop? Is your laptop connected to mains?

How have you configured channels in the PicoLog software?

This is most likely related to earthing.

Regards,
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Re: TC-08

Postby giladm » Wed Feb 15, 2012 7:30 am

hi
i am using a desktop computer, i configured cahnnel 1 to type K temperature measurement and channel 8 to mV measurement.
On the connector, one leg is ground and one is voltage less than 70mv.
it still affects the temperature measurement. what can i do to solve it. can it be current or input resistance problem?
Thanks
Gilad
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Re: TC-08

Postby Hitesh » Mon Feb 20, 2012 5:41 pm

Hi,

Have you tried the following?

  • Measure temperature only.
  • Measure voltage only?

Also, what are you measuring the temperature of? Is the thermocouple touching a voltage source or metal surface?

Are you using a single channel terminal board for your voltage measurements?

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Re: TC-08

Postby giladm » Tue Feb 21, 2012 9:02 am

yes, i tried both and the measurements looks o.k.
i am measuring skin temperature.
i am not using the single channel terminal board but a voltage divider.
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Re: TC-08

Postby Hitesh » Fri Feb 24, 2012 4:45 pm

Hi Gilad,

Is it possible for a schematic of your voltage divider setup please?

What are you measuring voltage of, and how is the wire connected to what it is you are measuring?

What ground is your voltage divider referenced to? Is it the same as the TC-08?

Regards,
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Re: TC-08

Postby giladm » Thu Mar 15, 2012 6:56 am

i purchased the teminal board and now i am using it.
i still have affect on other channels of the picolog.
the output of my device is 1-5V in one leg and 0V at the other. i think the reason for the influence is that the ground of the picolog and the ground of my device is not the same ground. i can i connect the grounds or how can i approach the picolog ground?

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Re: TC-08

Postby Martyn » Fri Mar 16, 2012 11:22 am

Just connect the two grounds together and see what happens
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Re: TC-08

Postby giladm » Sun Mar 18, 2012 6:35 am

where is the picolog grond, how do i connect with it?
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Re: TC-08

Postby Martyn » Thu Mar 22, 2012 10:17 am

The USB shell is the TC08 ground. There is a factory modification that can bring this out to a connector alongside the USB one.
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Re: TC-08

Postby giladm » Wed May 02, 2012 7:08 am

It is now working.
Thanks!
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