ScienTECH AC2500 User manual

PN9458Q
Vector™ Series
Calorimeter
Laser Power
Measurement
Operating Manual
Thank you for choosing a Scientech Vector™calorimeter detector. Scientech’s employees are pleased to
provide you with a product designed for years of reliable and accurate service. Please read this operating
manual before using your detector and power meter. This reference information will allow you to fully
understand the capabilities of the product. The detector is intended to be used only in the manner outlined
in this manual. Operation not within specifications for the product may cause product damage.

PN9458Q 2
TABLE OF CONTENTS
Calorimeter Operating Parameters............................................................................................................ 3
Vector™ Calorimeter Specifications........................................................................................................ 4
Absorption of HD Material................................................................................................................ 6
Environmental Specifications................................................................................................................... 6
CE Certification................................................................................................................................. 7
Unpacking and Setup................................................................................................................................ 7
Correcting Vector™ HD Calorimeter Operating Parameters for use at Different Wavelengths.............. 8
Vector™ Calorimeter Operation Without Power Meter........................................................................... 8
Cable Requirements........................................................................................................................... 8
Operation of VectorCalorimeters with a Digital Volt Meter......................................................... 9
Calibration of Vector™ Calorimeters Using Electric Substitution Heating............................................. 9
Vector™ Large Aperture Calorimeter Specifications ............................................................................ 12
Unpacking and Set Up ............................................................................................................................ 14
Cable Requirements for Large Calorimeters................................................................................... 14
LARGE Calorimeter Operation Without Powre Meter.......................................................................... 15
Operation of Large Aperture Calorimeters with a Digital Volt Meter............................................ 15
Calibration of Large Aperture Calorimeters.................................................................................... 16
Scientech Calibration Service................................................................................................................. 17
Limited Warranty.................................................................................................................................... 17
Return Material Procedure...................................................................................................................... 18
Disposal of Electronic Equipment.......................................................................................................... 18
HD Absorption vs. Wavelength.............................................................................................................. 20

PN9458Q 3
CALORIMETER OPERATING PARAMETERS
Calorimeter 1: Calorimeter 2:
Model No:
Serial No:
Model No:
Serial No:
Calibration Wavelength nm Calibration Wavelength: nm
Output Sensitivity
(S): Time Constant
(1/e): Calibration
Temp:
V/W Output Sensitivity (S): V/W
sec. Time Constant (1/e): sec.
oC Calibration Temp: °C
Sub. Heater Resistance (Rc): ohms Sub. Heater Resistance
(Rc): ohms
Sub. Heater Voltage (Vh): volts Sub. Heater Voltage
(Vh): volts
Sub. Heater Wattage (Wh) watts Sub. Heater Wattage
(Wh): watts

PN9458Q 4
VECTOR™CALORIMETER SPECIFICATIONS
The words "calorimeter" and "detector" are synonymous as used in this manual.
Table 1. Vector™ 8mm and 25mm Aperture Calorimeters
Model
AC2500
AC25HD
ACX25HD
AC2501
ACX2501
AC25UV
AC2504
Type of Absorber
Surface
Surface
Surface
Volume
Volume
Volume
Volume
Aperture Diameter
25.4 mm
25.4 mm
8 mm
25.4 mm
8 mm
25.4 mm
25.4 mm
Spectral Response
.25-35 µm
.193-12 µm
.4-2 µm
.266-1.2 µm
.4-1.2 µm
.193-.36 µm
.85-4.2 µm
Average Power Maximum
10 W
Average Power Minimum
1 mW when installed in an Isoperibol Enclosure
Noise Level
10 µW or µJ
Maximum Power Density
200 W/cm²
1.5 kW/cm²
12 kW/cm²
Note 1
Note 2
Note 3
Note 4
Maximum Peak Power Density
1 MW/cm²
100 MW/cm²
800 MW/cm²
Note 5
8.5 GW/cm²
Note 6
Note 7
Maximum Single Pulse Energy
10 J
Maximum Energy Density
Note 8
Note 9
Note 10
Note 11
Note 12
Note 13
Note 14
Precision
< 1 %
Accuracy
± 3 %
Response Time
3 sec when connected to a Scientech power meter in Watts Mode
Dimensions DxL - inches
cm
3.75 x 2.2
9.53 x 5.6
3.75 x 2.2
9.53 x 5.6
3.75 x 3.82
9.53 x 9.7
3.75 x 2.2
9.53 x 5.6
3.75 x 3.82
9.53 x 9.7
3.75 x 2.2
9.53 x 5.6
3.75 x 2.2
9.53 x 5.6
Weight - pounds
kg
1.5
0.68
1.5
0.68
1.7
0.77
1.5
0.68
1.7
0.77
1.5
0.68
1.5
0.68
Power Meter Compatibility H410, H410D, S310, S310D
Table 2. Vector™ 16mm and 50mm Aperture Calorimeters
Model
AC5000
AC50HD
ACX50HD
AC5001
ACX5001
AC50UV
AC5004
Type Absorber
Surface
Surface
Surface
Volume
Volume
Volume
Volume
Aperture Diameter
50.8 mm
50.8 mm
16 mm
50.8 mm
16 mm
50.8 mm
50.8 mm
Spectral Response
.25-35 µm
.193-12 µm
.4-2 µm
.266-1.2 µm
.4-1.2 µm
.193-.36 µm
.85-4.2 µm
Average Power Maximum
30 W
Average Power Minimum
40 mW
Noise Level
400 µ W or µ J
Maximum Power Density
200 W/cm²
1.5 kW/cm²
12 kW/cm²
Note 1
Note 2
Note 3
Note 4
Maximum Peak Power Density
1 MW/cm²
100 MW/cm²
800 MW/cm²
Note 5
8.5 GW/cm²
Note 6
Note 7
Maximum Single Pulse Energy
30 J
Maximum Energy Density
Note 8
Note 9
Note 10
Note 11
Note 12
Note 13
Note 14
Precision
< 1 %
Accuracy
± 3 %
Response Time
3 sec when connected to a Scientech power meter in Watts Mode
Dimensions DxL - inches
cm
4.75 x 2.3
12.07 x 5.8
4.75 x 2.3
12.07 x 5.8
4.75 x 3.92
12.07 x 9.96
4.75 x 2.3
12.07 x 5.8
4.75 x 3.92
12.07 x 9.96
4.75 x 2.3
12.07 x 5.8
4.75 x 2.3
12.07 x 5.8
Weight - pounds
kgs
2.9
1.3
2.9
1.3
3.1
1.4
2.9
1.3
3.1
1.4
2.9
1.3
2.9
1.3
Power Meter Compatibility H410, H410D, S310, S310D

PN9458Q 5
Note 1: AC2501, AC5001 30W/cm
2
@ 1064nm, 23W/cm
2
@ 532nm, 8.5W/cm
2
@ 355nm,
175mW/cm
2
@ 266nm
Note 2: ACX2501, ACX5001 Note 1 specs x 8 for 400nm to1.2µm
Note 3: AC25UV, AC50UV 50W/cm
2
@ 355nm Note 4: AC2504, AC5004 35W/cm
2
@1064nm
Note 5: AC2501, AC5001 100GW/cm
2
@ 1064nm, 78GW/cm
2
@532nm, 29GW/cm
2
@ 355nm,
580MW/cm
2
@266nm
Note 6: AC25UV, AC50UV Repetitive pulses: 101MW/cm
2
@355nm
Single pulses: 3.5GW/cm2 @ 355nm
Note 7: AC2504, AC5004 125GW/cm
2
@1064nm
Note 8: AC2500, AC5000 Max J/cm
2
= 1,000 x (pulse width)
1/2
to a
maximum of 200J/cm
2
.
Note 9: AC25HD, AC50HD Max J/cm
2
= 4,500 x (pulse width)
1/2
to a
maximum of 14J/cm
2
.
Note 10:ACX25HD, ACX50HD Max J/cm
2
= 36,000 x (pulse width)
1/2
to a
maximum of 42.5J/cm
2
.
Note 11: AC2501, AC5001 Repetitive pulses: 4.1J/cm
2
@1064nm, 3.2J/cm
2
@532nm, 1.2J/cm
2
@355nm,
24mJ/cm
2
@266nm Single pulses: 8J/cm
2
@1064nm, 6.2J/cm
2
@532nm,
2.3J/cm
2
@355nm, 46mJ/cm
2
@266nm
Note 12: ACX2501, ACX5001 Note 11 specs x 8
for 400nm to 1.2µm Note 13: AC25UV, AC50UV
Repetitive
pulses: 1.1J/cm
2
@ 355nm
Single pulses: 40J/cm2 @ 355nm
Note 14: AC2504, AC5004 Repetitive pulses: 4.8J/cm
2
@1064nm
Single pulses: 10J/cm2 @ 1064nm

PN9458Q 6
Absorption of HD Material
Warning: You must exercise caution when using HD detectors. They exhibit spectral reflection of
between 7% and 18%, of the input power, back out of the aperture. Please refer to Figure 1 to determine
the reflectance for the wavelength you are measuring. These detectors should be treated as a partial mirror
or any other type of reflective optic and the appropriate caution level observed, especially at the CO2
wavelength.
A B S O R P T I O N O F H D A B S O R B E R V s . W A V E L E N G T H
1 0 0
9 5
9 0
8 5
8 0
7 5
7 0
6 5
6 0
5 5
5 0
0 1 1 0 1 00
W A V E L E N G T H [ M I C R O M E T E R S ]
Figure 1. HD Absorption vs Wavelength
HD calorimeters might show “beam” marks on the absorbing surface. These marks are characteristic of
the material and do not affect the performance of the calorimeter. Do not rub off or remove the marks.
Polishing or cleaning the absorbing surface might change the performance of the calorimeter.
Please see the table at the end of this manual for specific absorption vs. wavelength information.
ENVIRONMENTAL SPECIFICATIONS
This product is intended for indoor use at altitudes up to 2000 meters, Pollution Degree 2 in accordance
with IEC 664 and transient over voltages according to Installation Categories (Overvoltage Categories)
II. Note that each of the above detectors will not pass the IEC 801 Publication, Part 3, Radiated
Electromagnetic Field Requirements. The system, meter and detector, is designed to measure radiation
within the test's radiation band. The detectors were held outside the radiated electromagnetic field during
ABSORPTION [%]

PN9458Q 7
this test. It is up to the user to be aware of RF fields present during measurements and their effects if any
on those measurements.
CE Certification
All of the calorimeters listed in this manual have been certified for the European CE mark.
UNPACKING AND SETUP
The calorimeter and accessories are shipped in custom packing materials. All packing materials should be
saved for future damage free shipments.
Each detector has a 1/2" diameter mounting hole for installing the detector onto a mounting base assembly.
Screw the mounting base post into one of the mounting holes in the body of the calorimeter. Optional
mounting base assemblies are available for purchase from Scientech for mounting the detector/mounting
base assembly to an optical bench.
A 3 meter mini DIN interconnect cable is also included. If you are using a Scientech indicator, connect
the calorimeter to the indicator with the interconnect cable. 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: Vector™ 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 Vector 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.

PN9458Q 8
CORRECTING VECTOR™ HD CALORIMETER OPERATING
PARAMETERS FOR USE AT DIFFERENT WAVELENGTHS
Scientech Vector calorimeters in general have a flat response to all wavelengths within their specified
spectral response. HD and HDX calorimeters are an exception to that rule and are calibrated at a specific
wavelength by adjusting the calorimeter’s gain circuitry for that wavelength. The calibration wavelength
is recorded in the Operating Parameters section at the front of the manual and on the detector’s serial tag.
When a HD or HDX calorimeter is used at a wavelength other than the calibration wavelength, the
calorimeter’s output sensitivity can be adjusted to compensate for the absorption rate at the new
wavelength as follows:
1. Find the absorption rate from the chart at the end of this manual for the calibration wavelength of
your calorimeter.
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 calibration wavelength wavelength from serial tag
NOTE: Due to variability in the manufacturing process the absorption characteristics of the HD model
calorimeters 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.
VECTOR™CALORIMETER OPERATION WITHOUT POWER
METER
Cable Requirements
Vector calorimeters are powered up by the indicators. To use a Vector calorimeter without a Scientech

PN9458Q 9
power meter, but with a volt meter, you must apply +/-8Vdc to the mini DIN connector as shown in Figure
2. The voltage output of the calorimeter, from pin 8, should be connected to the positive side of the DVM
or chart recorder. All 3 of the grounds should be tied together at the negative side. Pins 2 and 3 are not
used.
Figure 2. Calorimeter mini DIN Connector Pin Out
Operation of VectorCalorimeters with a Digital Volt Meter
The calorimeters may be used with any digital volt meter (DVM) capable of reading 5 volts full scale.
1. Connect the output of the calorimeter to the DVM.
2. Select the DC volts mode.
3. Direct the laser beam on to the absorbing surface of the calorimeter.
4. 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.
CALIBRATION OF VECTOR™CALORIMETERS USING

PN9458Q 10
ELECTRIC SUBSTITUTION HEATING
For Vector calorimeters the electric substitution heating option must be ordered and installed at the factory
when the calorimeter is purchased. It cannot be retrofitted to a calorimeter at a later time. To calibrate
using electric substitution heating proceed as follows.
A. Remove the screws holding the calorimeter's ID tag and remove the plate to expose the circuit
board. Figure 3 shows the pin out of the calorimeter circuit board.
Figure 3. Vector Calorimeter Circuit Board
B. Connect a DVM to the test points labeled SUB and HTR on the calorimeter circuit board.
C. Measure the resistance of the substitution heater making sure to subtract the resistance of
the patch cables from the total resistance measurement. Compare this resistance to Rc in
the calibration data in the front of the manual. The two should agree within 2%. If not
contact Scientech.