General Tools and Instruments IRT730K - Manual (Page 13)

RETURN FOR REPAIR POLICY
Every effort has been made to provide you with a reliable product of superior quality. However,
in the event your instrument requires repair, please contact our Customer Service to obtain an
RGA (Return Goods Authorization) number before forwarding the unit via prepaid freight to the
attention of our Service Center at this address:
General Tools & Instruments
80 White Street
New York, NY 10013
212-431-6100
Remember to include a copy of your proof of purchase, your return address, and your phone
number and/or e-mail address.
APPENDIX I
The IRT730K’s field of view
HOW TO MAKE ACCURATE IR MEASUREMENTS
The IRT730K has a distance-to-spot (D:S) ratio of 30:1. This means that the target area
(spot) whose infrared radiation (temperature) is being measured increases in diameter
by 1 inch for every 30 inches you move away from the target. Conversely, the diameter
of the target area measured decreases by 1 inch for every 30 inches you move closer
to the target.
All IR thermometers (IRTs), including the IRT730K, take the average temperature of all
objects within a circular target area (spot). Although the distance “D” in the D:S ratio is
defined as a linear value and the “S” defines the diameter of the spot (see above figure),
the critical parameter is the target area. Depending on the distance to the target (the
object whose temperature you want to measure), the target area may include both the
target and background objects near or behind the thermometer’s field of view, which
defines the target area or spot.
13
S
inches
mm
D
D:S=30:1
25@750
50@1500
1@30
2@60
3@90
75@2250