palintest Macro 900 Operation Manual

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palintest Macro 900 Operation Manual Manual pdf 19 page image

Macro 900 Operation Manual V3© 2013 Palintest Ltd. www.palintest.com Page 19 of 147measurement, temperature is automatically compensated for.During calibration of the pH electrode, the small variation in the calibrationbuffer solutions due to temperature is not compensated for due to thedifferences in thermal coefficient between various buffer manufacturers. Forthis reason, the three pH points should be calibrated as close to the buffermanufacturer's specified temperature as possible (usually 20ºC or 25ºC)although a variation of up to +/-10ºC makes very little difference in reality.During pH measurement, temperature variation is automatically compensatedfor.6.5. GPS ReceptionThe Macro 900 Meter contains a built-in GPS receiver and antenna. Theantenna is situated at the top of the case, just behind the Palintest logo. Foroptimum signal reception, the antenna must be able to ‘see’ a reasonably largeamount of the sky. The GPS receiver will not work indoors or whenshielded from the sky by any solid structure.After switch-on, the GPS receiver will automatically start to search for satellites.During this phase, the message GPS:Acquiring will be shown on the bottomline of all the screens. As soon as three satellites are acquired, two dimensionalposition (no altitude) will be calculated and the message GPS:2D POS will beshown on the bottom line of the screens.Once a fourth satellite is acquired, altitude will be calculated and GPS:3D POSwill be shown on the bottom line of the screens. With a good view of the sky,position should be calculated within ninety seconds of switch-on. To see yourgeographic position and the number of satellites in use, use the left or rightarrow keys to scroll to the Position page.If you switch the meter on indoors, then carry it outside after several minutes,there may be a considerable delay in acquiring satellites. In this case, switchthe meter off, then back on again to reset the acquisition process.