Instructions

UM-0085-B09 DT80 Range User Manual Page 374

Getting Optimal Speed from Your DT80

In applications where it is important to sample as rapidly as possible, the following guidelines may assist:

• Switch off data return and logging for channels you are not interested in.

• Set

P21=1 so that the analog power supply is always on. This prevents the 50ms warm-up delay which can

occur if there is any gap between schedule execution.

• Similarly, if any CEM20 units are in use then set P28=1 so that 12V output for powering the CEM is always on,

• Set P11 to a higher value, which will reduce the time over which an analog acquisition is integrated. For

example, if P11 is changed from 50 to 500 then the sample time will be reduced from 20ms to 2ms. Be aware

that this will cause a degradation in the DT80's ability to reject noise.

• Reduce the channel's settling time, using the MDn channel option. The default is 10ms. It is not recommended

to reduce this below 5ms because the DT80's relays need about this long to switch before a measurement can

commence.

• Disable automatic calibrations using

/k. Be aware that readings will now be subject to drift with temperature.

• Set

P62=1, which will leave the DT80's relays set when the schedule completes (normally they are set back to

a quiescent state at the end of a schedule). If you are measuring a single voltage input then you will now be

able to do repeated samples without changing the relay settings at all, which would then allow you to reduce the

settling time to zero (i.e.

MD0)