PicoScope 7 Software
Available on Windows, Mac and Linux
Confused on Thermocouple Data
Confused on Thermocouple Data
Hello!
I recently purchased a PicoScope 2405A 4channel 25MHz device, and I'm using Type T thermocouples to measure various temperature changes in the lab. I calibrated the PicoScope probes and connected them to my thermocouples, but when I dip the measurement junction into ice water or a 45deg C water bath or liquid nitrogen, I get readings that don't make sense. I should be seeing higher voltage for warmer temperatures, but the readings are varied in magnitude across various temperatures. Any ideas? Thanks in advance.
I recently purchased a PicoScope 2405A 4channel 25MHz device, and I'm using Type T thermocouples to measure various temperature changes in the lab. I calibrated the PicoScope probes and connected them to my thermocouples, but when I dip the measurement junction into ice water or a 45deg C water bath or liquid nitrogen, I get readings that don't make sense. I should be seeing higher voltage for warmer temperatures, but the readings are varied in magnitude across various temperatures. Any ideas? Thanks in advance.
Re: Confused on Thermocouple Data
where is the other junction of your thermocouple ?
the difference is in the mV range for these type of devices about 40uV / C
https://www.pyromation.com/downloads/data/emft_c.pdf
Benno
the difference is in the mV range for these type of devices about 40uV / C
https://www.pyromation.com/downloads/data/emft_c.pdf
Benno
Re: Confused on Thermocouple Data
The measurement junction was in the ice water, and the reference junction was connected to the probes that came with the PicoScope. Thermocouples > probes > PicoScope > laptop.
Re: Confused on Thermocouple Data
and how did you setup your scope.
Because I tested over here with a 1:1 probe and scope set to +/- 20mV and resolution enchantment to the max.
Then I can measure the difference between hanging in the air 90uV and holding it in my hand 194uV.
But remember you are measuring in the uV ranges so you won't see it on the trace.
In this setting you are measuring in the noise (1 LSB is 156uV) so you need to average a lot of measurements (in my case 10000000) to have some measurable difference.
Benno
Because I tested over here with a 1:1 probe and scope set to +/- 20mV and resolution enchantment to the max.
Then I can measure the difference between hanging in the air 90uV and holding it in my hand 194uV.
But remember you are measuring in the uV ranges so you won't see it on the trace.
In this setting you are measuring in the noise (1 LSB is 156uV) so you need to average a lot of measurements (in my case 10000000) to have some measurable difference.
Benno
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