Hi Guys,
We are trying to log the change of a resistance versus time to calculate an angular velocity. I have managed to obtain a logging rate of approx 50 ms. Is it possible to go lower then this, and if so how?
Cheers,
Geoff
Hi Geoff,
The DT80 is not designed as a fast logger but there are some things you can do to speed things up a bit.
P11 Mains frequency.
The DT80 samples a channel over a 20 mSec time period. This is the period of a mains frequency of 50 Hz. To reduce this change the main frequency to 1000 Hz.
Lock the gain range.
The DT80 will read a channel and then if the reading is over or under will change the gain range and take another reading. If your resistance is a maximum of 10,000 Ohms then lock the gain to the 3 Volt range, maximum 1000 Ohms use the 300 mV Range and maximum 100 Ohms us the 30 mV range
Cheers,
Roger
Dear Geoff,
In addition to Roger suggestion, look also at page 261 of DT80's manual (latest version UM-0085-A8) "Getting optimal speed from your DT80".
Currently I am facing a similar requirements from a customer and I'm testing a RS485 voltage to ASCII "fast" converter; the main reason to use such module is to avoid the input relay multiplexer "going crazy" switching many times per second over a long data acquisition sessions. Currently I reach a cycle time of about 50 ms (one channel).
Feel free to contact me if you need more details.
