General Tools and Instruments DLM204 - Manual (Page 8)

that it can resolve. On the DLM204, the 0 to 20 FC range has
the highest resolution because its readings are always
integers followed by two decimal places. The two ranges with
the next-best resolution are 0 to 200 FC and 0 to 200 LUX;
each can resolve measurements to one decimal place. The
other five available ranges have the worst resolution; none of
them can measure light levels with an accuracy of less than
1 lux or 1 foot-candle.
For the sake of accuracy, you should try to maximize the
resolution of every measurement that you make—by
switching to the next-narrowest range. If doing so produces a
reading with an additional decimal place, your effort will be
rewarded by a more-accurate reading. If switching to the
next-narrowest range produces an overload, simply return to
the previous range.
Whichever range you choose will automatically become the
default range used by the meter when it is powered up
following a shutdown. In other words, the DLM204
“remembers” both the measurement unit and the
measurement range in effect when it was last used.
To hold any reading (“freeze” the display), press the D-H
button (Callout 5). D-H will appear on the top line of the LCD.
This feature is useful for making measurements above your
head, below your knees, or around a corner. Held readings
can be viewed at eye level later.
To release the display and resume making real-time readings,
press the D-H button again.
The DLM204 can also keep track of the maximum light levels
measured during a measurement session—the period of time
that begins when the meter is powered on and ends when it
is powered off.
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