Strange Data peak?

[43chlee]

I'm using LabWindows/CVI with Fieldpoint FP-1600 and FP-TC-120.
There was a strange data while gathering data from FP-TC-120.
I use the sample program, FPAI Read Cache Example.

See attached capture screen jpg file.

Please help me, why this strange data happened?

Thank You.
- CH Lee from Seoul Korea -

[Aaron_G]

In my experience, the spike in the readings may have been caused by several different possible causes.
One option may have been that due to a loose wire, there may have been a temporary disconnection. This will be reported as a positive full scale reading with an error (33489 Open Thermocouple detected). A second scenario I have seen, is a bad reading when using unshielded thermocouples that are near motors or other electrically noisy devices and they are starting or stopping. A third cause I have seen of periodic bad readings is a spike in the power supply to the network module. A forth cause, related to the third, is spikes on the power rails going into the FP-TC-120 (for best results, the V&C terminals should not be connected to any other terminal bases or the
network module). Finally, a spike may result from a loss of communication with the network module, although this will normally result in all channels going out of range.

Regards,
Aaron

[Paul Jackson, Crowcon Detection Instrume]

I, too, have seen this problem from time to time. The problem manifests itself with very high temp reading spikes, '1770' is common, although sometimes it is lower than this.
A recent test was full of these spikes and Aaron's comments about unshielded thermocouples are helpful. This could be my problem. I think the environmental chamber might be a factor.