pico Technology USB DrDAQ, Руководство пользователя

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USB DrDAQ User's Guide 21
Copyright © 2013 Pico Technology Ltd. All rights reserved. usbdrdaq.en r4
You should end up with a table something like this:
Chemical Measured humidity Standard humidity Temperature
Potassium chloride 81% 85% 20°C
Magnesium nitrate 50% 54% 21°C
Magnesium chloride 30% 33% 20°C
Keep this table for further reference. It will be useful if you have to reset the software
with the PicoLog Recorder
New Settings command.
At this stage compare the measured and standard values. If you find that the
measured values differ from the standard values by more than 10%, then there is
something wrong. You may have had an unsaturated solution, some contamination in
the solution, inadequate sealing of your test container, or possibly a damaged sensor.
Check your calibration routine. If you still get large errors contact Pico for assistance.
If you are using a calibrated reference this should give values very close to those
quoted for your standard solutions. If these values disagree by more than a few
percent there may be an error in your calibration procedure. When the two are in
agreement use the values given by the calibrated reference as the correct figures for
your data table.
Once you have your calibration data you must enter it into the Pico software to
calibrate the sensor:
1. Open the PicoLog Parameter Scaling Dialog.
2. Start PicoLog Recorder.
3. Click on Settings .
4. Click on Input Channels . The DrDAQ Measurements dialog appears.
5. Select the input channel for the humidity sensor, for example 'External 1
Humidity'.
6. Click on the Edit button. The Edit DrDAQ Measurements dialog appears.
7. Click on the Options button. The Parameter Options dialog appears.
8. Click on the Scaling button. The Parameter Scaling dialog appears.
9. Enter your calibration data.
10. Pull down the Scaling Method list and select Table lookup .
11. To start your calibration table, click in the white rectangle. The text cursor
appears.
12. Type in the value that you measured with the DD101 under Raw . Type a space
then enter the standard value under scaled . Press Enter .
13. Enter all the pairs of measured and standard values that you have to build your
table. You should end up with two columns of values. Note - your table must
have at least two pairs of values.
14. Click OK to close the dialogs.
15. Click OK to close the Parameter Scaling dialog. The Parameter Scaling dialog
closes.
16. Click OK to close the Parameter Options dialog. The Parameter Options
dialog closes.
17. Click OK to close the Edit DrDAQ Measurements dialog. The Edit DrDAQ
Measurements dialog closes.
18. Click OK to close the DrDAQ Measurements dialog. The DrDAQ
Measurements dialog closes.
This completes the entry of the calibration data.