Scientech Large Aperture Calorimeter - Manual (Page 4)

4
U
NPACKING AND
S
ET
U
P
:
The calorimeter and accessories are shipped in custom packing materials. All packing materials should be
saved for future damage free shipments.
A ¾” diameter mounting post is included. Screw the post into the mounting hole in the body of the calorimeter.
Mount the post to your optical bench or working surface.
If you are using a Scientech indicator, connect the calorimeter to the interface module and the interface module
to the indicator. Follow the detailed set up instructions that are in the indicator’s instruction manual. If you are
not using a Scientech indicator operating requirements are contained in this manual.
Note: Large aperture calorimeters are sensitive to all types of thermal input. Due to the handling of the
calorimeter during setup and possible environmental temperature differences, thermal gradients
may exist in the calorimeter. Allow the calorimeter to sit undisturbed for several minutes to,
reach thermal equilibrium, before using.
C
ABLE
R
EQUIREMENTS
:
Refer to Figure 1. The output of the calorimeter is connected directly to the DVM or chart recorder. Large
aperture calorimeters do not require any power. The voltage output is on pin 1 of the DIN connector and should
be connected to the positive side of the DVM or chart recorder. Ground is on pin 3 and should be connected to
the negative side. Pin 2 is not used.
Figure 1 – 100mm and 200mm connectors
C
ALORIMETER
O
PERATION
W
ITHOUT AN
I
NDICATOR
:
Note: Whenever a large aperture calorimeter is used without an indicator the interface module,
which is required to connect the calorimeter to the indicator, is not used.
Operation of Large Aperture Calorimeters with a Digital Volt Meter:
The calorimeters may be used with any digital volt meter (DVM) capable of reading 5 volts full scale.
A. Refer to Figure 1. Connect the output of the calorimeter to the DVM.
B. Select the DC volts mode.
C. Direct the laser beam on to the absorbing surface of the calorimeter.
D. When the display of the DVM has stabilized (about 2 minutes), calculate the laser power using the
formula: W = V/S
where:
W = Laser power in watts
V = Voltage reading of the DVM in volts
S = Sensitivity of the calorimeter from page 2.