CEM20 noise

Kaltal

posted Jul 5 '19 at 4:52 pm

Hi,

I have a DT85 with 1 CEM20 connected to channel 1. They are both collecting strain gauge data. I have the strain gauge wires going to the DT85 and CEM20 grounded via the grounding screw on the case of the DT85.

All the DT85 channels are looking good in terms of data and noise but the CEM20 ones are all showing the same noise levels. I do have a channel in each unit to compensate for noise and it works ok post-processing. But I would prefer to not have to do that. What did I do wrong for the CEM20 grounding?

Hi, I have a DT85 with 1 CEM20 connected to channel 1. They are both collecting strain gauge data. I have the strain gauge wires going to the DT85 and CEM20 grounded via the grounding screw on the case of the DT85. All the DT85 channels are looking good in terms of data and noise but the CEM20 ones are all showing the same noise levels. I do have a channel in each unit to compensate for noise and it works ok post-processing. But I would prefer to not have to do that. What did I do wrong for the CEM20 grounding?

dataTaker Expert

posted Jul 8 '19 at 3:17 pm

Hi Kaltal,

You may need to use shielded wire for both signal and analog cable and ground the shield into DGND pin. Please refer to Figure 173 of DT8x user manual (UM-0085-B11E).

Best regards,
Rudy Gunawan

Hi Kaltal, You may need to use shielded wire for both signal and analog cable and ground the shield into DGND pin. Please refer to Figure 173 of DT8x user manual (UM-0085-B11E). Best regards, Rudy Gunawan

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