The type T thermocouples reads wrong in the DT. We confirmed the measurements all the way up to the connections on the DT 80 and they should be reading 110 to 120°F. The DT 80 though fluctuates between 49 and 84 F, with one reading a negative temperature. Other type K thermocouples connected to the DT 80 reads correct. No configuration changes were made since the time they last all worked. The only difference is that the DT 80 was switched off for about two weeks. We uploaded the last known good configuration and it still does not work.
It seems to be mostly the type T thermocouples that are affected. It seems that their reading is off by about 70 F, which is ambient temp in the room. I checked REFT and 1REFT and they read 84 F and 76 F. We did not set any external reference temperatures, so they should use the internal reference temperature. All the thermocouples reads between 1.1 and 1.2 mV on the connector blocks, so I know the polarities are good and reaches the connector blocks. We also triple checked the connections on the connector blocks.
One of the type T's reads -34 F. The channel configuration is the same as the others, and it reads 1.2mV on the connector block.
Any ideas?
The type T thermocouples reads wrong in the DT. We confirmed the measurements all the way up to the connections on the DT 80 and they should be reading 110 to 120°F. The DT 80 though fluctuates between 49 and 84 F, with one reading a negative temperature. Other type K thermocouples connected to the DT 80 reads correct. No configuration changes were made since the time they last all worked. The only difference is that the DT 80 was switched off for about two weeks. We uploaded the last known good configuration and it still does not work.
It seems to be mostly the type T thermocouples that are affected. It seems that their reading is off by about 70 F, which is ambient temp in the room. I checked REFT and 1REFT and they read 84 F and 76 F. We did not set any external reference temperatures, so they should use the internal reference temperature. All the thermocouples reads between 1.1 and 1.2 mV on the connector blocks, so I know the polarities are good and reaches the connector blocks. We also triple checked the connections on the connector blocks.
One of the type T's reads -34 F. The channel configuration is the same as the others, and it reads 1.2mV on the connector block.
Any ideas?
edited Oct 8 at 10:25 pm
