RE: B&K DAS240-BAT RoadTest-in-Depth: Ch6 – Simulated Field Tests

Jan Cumps — Tue, 25 Feb 2020 16:44:31 GMT

Once you see a drunk caterpillar in this, you can't unsee it:

[View:/resized-image/__size/282x504/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-225b9696-45d4-4f21-8ea2-6eb9ae953ff5/2158.contentimage_5F00_206181.png:282:504]

RE: B&K DAS240-BAT RoadTest-in-Depth: Ch6 – Simulated Field Tests

michaelkellett — Tue, 25 Feb 2020 09:49:54 GMT

Thanks for another interesting and comprehensive road test.

There is one point I'm not clear on, in your battery test you refer to the voltage inputs as being isolated (as in isolated from each other) but I can't see any components in the device which would achieve this or find any reference in the documentation to maximum common mode voltage or safe voltage to earth. ( Let alone any discussion of common mode rejection.) It looks to me as if all the inputs share a common earth but that in some modes they operate differentially, but are isolated from the control system earth. (There seems to be a single small DC-DC converter in the signal acquisition section.)

I'd be very interested in your comments on this.

And while I'm asking you to snoop more [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-225b9696-45d4-4f21-8ea2-6eb9ae953ff5/contentimage_5F00_1.png:16:16], can you spot any serious attempt at static discharge and RF protection in the acquisition section or the interface blocks.

Thanks.