[qc-issues] DR-4000 and CMT40T1 resulting in bad data

[Chad]

Hi all,

An operator sent us some data from a CMG-40T1 sensor recorded on a
Sprengnether/eentec DR-4000.  The equipment was deployed on a
portable/temporary experiment.

What you see in the first two plots are "dips" on all 3 channels, the dips are
apparently not regular in time or duration.

The 3rd plot displays chirping, I'm assuming this is from a local environment
source but include it for completeness.

Any ideas on what might be causing the dips?

thanks,
Chad
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