Scientech S310 Vector - Manual (Page 23)

23
C
ORRECTING
P
YROELECTRIC
D
ETECTOR
O
PERATING
P
ARAMETERS FOR
U
SE
AT
D
IFFERENT
W
AVELENGTHS
:
NOTE: Due to variability in the manufacturing process the absorption characteristics of the HD and P
model detectors can vary in the UV region (190 to 400nm). Scientech recommends optical
calibration at 266nm if the detector is to be used in the UV region instead of relying on an
absorption rate in the chart at the end of this manual.
All pyroelectric detectors are calibrated at a specific wavelength and the detector’s output sensitivity is derived
for that wavelength. The output sensitivity and calibration wavelength is recorded in the Operating Parameters
section at the front of the manual and on the detector’s serial tag. When a pyroelectric detector is used at a
wavelength other than the calibration wavelength, its output sensitivity can be adjusted to compensate for the
absorption rate at the new wavelength. The new output sensitivity is calculated as follows:
1.
Find the absorption rate from the chart at the end of this manual for the calibration wavelength of your
pyroelectric detector.
2. Find the absorption rate for the wavelength where you will be working.
3. Determine the new output sensitivity using the following formula:
absorption rate of new wavelength x output sensitivity (V/J) = output sensitivity for new
absorption rate of the calibration wavelength wavelength from serial tag
This new output sensitivity can be entered into the S310 as described in Group Settings or when using the
pyroelectric detector without a S310 indicator as discussed later in this manual.
U
SING THE
S310
WITH
A
STRAL
 S
ERIES OR
L
ARGE
A
PERTURE
C
ALORIMETERS
The calorimeter selected needs to be the appropriate model for the planned laser measurements. Please
familiarize yourself with the operating specifications which are given in the front of this manual.
Note: The default Group Setting for calorimeters is Group #1. Either select Group #1 or
configure another Group for calorimeters and select that Group.
Note: Astral and 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.
Note: When using a 25mm Astral calorimeter for measuring average power levels below 30mW
and single pulse energy levels below 30mJ, a Scientech Model 36-0203A, Isoperibol
Enclosure, is highly recommended. The isoperibol enclosure should not be used at average
power levels above 30mW, and single pulse energy levels above 100mJ because heat build
up will occur.
Note: Large Aperture calorimeters and the Interface Modules that they are calibrated with are
matched sets and must be used together.
1. To Turn On the Meter:
Note: For the most accurate measurements possible, the S310 should be turned on and warmed
up for 30 minutes.
Press the ON switch located in the rear panel of the meter. The S310 will immediately turn on with its
operational state based on the last used detector Group Setting. If you purchased the S310 with one detector,
this detector’s Group settings will be active and you are ready to take measurements. If you purchased more
than one detector with the S310, you must chose the Group setting for the detector you are connecting to the
S310 as described in step 4. The Group Setting for each detector purchased with your S310 is shown on page 2.