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number. If you do not know the number, open your PC's Control Panel, locate the Device
Manager icon, and left-click it. Among the rows listing your connected peripherals is one
named Ports (COM &
LPT). Expanding this row
should reveal that one of
the ports is the "Prolific
USB-to-Serial Comm Port
(COMX)" (see screen shot
at right). This listing
represents the USB cable
you have plugged in. Enter
the number that appears
instead of the X following
the term COM using the
Comm.Port Setting
pulldown.
• Name your logger by
entering up to 20
characters in the ID box (top section of left image on page 5). Use capital letters and/or
numbers, with no spaces between terms. Then click OK.
• Click the OK box in the bottom (Current Date/Time) section (left image on next page).
• Adjust the high VOC concentration audible alarm (which has a factory default setting of
35.00 ppm), and program the meter either to track 1) VOC readings alone, or
2) VOC readings as well as ambient temperature and RH values (middle image on next
page). As mentioned earlier, the 32,000 point memory of the VOC08 can be devoted
entirely to VOC readings, or devoted one-third each to VOC, ambient temperature and
RH readings.
• Choose a sampling time (top line of right image on next page), data logging start mode
(middle section of right image on next page) and temperature unit (bottom line of right
image on next page).
With regard to sampling time, using the shortest setting of 1 second may result in
too much essentially identical data being stored in memory, potentially limiting its
capacity to capture important events such as an unexpected excursion of a parameter.
Conversely, using a sampling time measured in minutes may cause important events to
go undetected.
If you are an experienced data logger, you already know how to choose the optimum
sampling time for your application. If you are a novice, pick a sampling time closer to the
minimum than the maximum sampling time (5 or 10 seconds is a typical setting), on the
assumption that the VOC08 probably has enough memory (32,000 locations) to store all
the data you ask the meter to log—unless you want to log data for months
4
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