Fluke Biomedical 07-621 - Manual (Page 5)

General Information
Introduction
1
1-1
Section 1
General Information
1.1 Introduction
This manual describes the operation of the Precision Photometer (Model 07-621). Please read it
completely to understand the capabilities of your instrument.
There are two operating controls: Measure for taking a reading, and Range to adjust the meter display to
the light level being measured.
One turret is supplied for two types of measurements. In one position, illuminance may be measured in
units of lux. In the other position, luminance is measured in units of candela/m
2
(Nit).
1.2 Measure Control
Depress and hold this control (right side of meter) to turn the meter on and display a light reading. If you
fail to obtain a reading, depress the Range control repeatedly until numbers appear on the display. (Keep
the Measure control depressed when doing this, in order to see the result in the display.)
The display may show the following signals:
Display Description Significance
Three decimal points only
displayed Overrange reading.
Adjust Range.
000, 001 or 01 Zero or very low reading Underrange reading.
Adjust Range
9.62
Good reading
Display reads in
1,000s, i.e., 9620
9.62
Good reading Change batteries soon
X
1000
LO
BAT
When the Measure control is released, the display will freeze and show the last reading for about 5
seconds. This feature allows viewing a reading when taking measurements in difficult viewing situations.