Fluke Biomedical 07-621 - Manual (Page 6)

Nuclear Associates 07-621
Operators Manual
1-2
1.3 Range Control
This control sets the readout range of the digital display. Each time Range is depressed, the meter reads
the next higher range until it reaches the highest range. Then the Range control will recycle .the meter to
the lowest (most sensitive) range.
The table below explains how the ranges work. The arrows signify the action when Range is depressed.
When the 1000 indicator is lit on the display, the reading shown is in thousands. For example, a display of
6.43
is 6,430. Similarly, a display of 0.43
becomes 430 (this reading could have been displayed more accurately
on range 2).
X
1000
X
100
Range No. Display Meaning
00.1 to 99.0 As shown
001 to 990 As shown
0.01 to
9.99
10 to 9990
00.1
to 99.9
100 to 99900
001
to 999
1000 to 999000
X
1000
X
1000
X
1000
X
1000
X
1000
X
100
The readings above are in units of lux or candela per square meter (Nit), depending upon turret position.
Once a range is selected, the meter will maintain that range whether Measure is depressed or not
(measure need not be depressed to change ranges). No damage will occur if the meter is switched to a
sensitive range under strong illumination.
Since there are 5 ranges, depressing Range four times in quick succession has the effect of selecting the
next more sensitive range.
1.4 Mode Of Measurement
The turret on top of the instrument has two light receptors. The proper receptor is positioned over the light
sensor for the desired type of measurement. The positions of the light receptors can be changed by
loosening the turret thumbscrew, reversing the turret, and re-tightening the thumbscrew.
Turret
Sensor
Aperture
White Disc