Labsphere SC-5500 User manual
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SX-01635-000, Rev. 5
EC Declaration of Conformity
according to EC Electromagnetic Compatibility Directive 89/336/EEC
and according to EC Low Voltage Directive 73/23/EEC
We herewith declare, Labsphere, Inc.
P.O.Box 70, Shaker Street
North Sutton, NH 03260 USA
that the following product complies with the appropriate basic safety and health requirements of the EC
Directive based on its design and type, as brought into circulation by us. In case of alteration of the prod-
uct, not agreed upon by us, this declaration will lose its validity.
Product Description: Integrating Sphere System Control
Model Number: SC-5500
Applicable EC Directive(s): EC Electromagnetic Compatibility 89/336/EEC
EC Low Voltage Directive 73/23/EEC
Applicable Harmonized Standards: EN 61010-1:1993 EN 55022:1994, Class B
EN 50081-1:1992 IEC 801-2:1991
EN 50082-1:1992 IEC 801-3:1984
IEC 801-4:1988
IEC 1010-1: 1990 A1:1992
Authorized Signature:
Title of Signatory: Vice President of Engineering Date: April 26, 2005
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SX-01635-000, Rev. 5
SC-5500 Integrating Sphere System Control
Introduction ....................................................................................................... 1
Unpacking and Inspection ............................................................................... 3
Installation and Assembly ................................................................................ 4
Line Voltage Input Module ..................................................................................4
Rack Mounting ....................................................................................................5
Electrical Cable Hookup .....................................................................................7
System Description and Operation ................................................................. 9
Detector Input ....................................................................................................10
SC-5500 Computer Interface ............................................................................11
Lamp Power Supply, Detector Multiplexer & Variable Attenuator Operation .11
Operating Procedures ........................................................................................12
User Interface ....................................................................................................13
Calibration .........................................................................................................16
SC-5500 Programming ................................................................................... 18
SC-5500 Programming Commands ..................................................................18
IEEE-488 Programming ....................................................................................20
RS-232C Programming .....................................................................................21
Maintenance .................................................................................................... 22
Appendix A Specifications ............................................................................ 26
Appendix B Schematics ................................................................................. 28
Appendix C Sample Programming .............................................................. 31
IEEE-488 Programming in C++ ........................................................................31
IEEE-488 Programming in QuickBasic ............................................................35
RS-232C Programming in C++ .........................................................................36
RS-232C Programming in QuickBasic .............................................................39
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SX-01635-000, Rev. 5 1
Introduction
The SC-5500 Integrating Sphere System Control is the standard radiometer used by all single
channel Labsphere detector systems, including uniform source and photopic lamp measurement
systems. The radiometer is microprocessor-controlled, and accommodates either a silicon, ger-
manium, or photomultiplier tube detector. The SC-5500 can function as a stand-alone compo-
nent, or it can operate in conjunction with standard Labsphere Windows-based software.
Additional to its radiometer or photometer duties, the SC-5500 functions as an interface between
your desktop computer and peripheral Labsphere components. Equipped with both RS-232C
serial port and IEEE-488 bus interfaces, the SC-5500 communicates directly with the VAC-1000
Variable Attenuator Control, DM-1000 Detector Multiplexer and either the LPS-045-H or LPS-
200-H Lamp Power Supply. The SC-5500 exercises control over these peripheral devices, at the
same time, displaying the continuous output of your detector. The SC-5500 Integrating Sphere
System Control is designed for either table top or rack mounted use.
Up to 100 different calibration constants can be programmed into the SC-5500 for direct read-
out. All calibrations are performed at the Labsphere Optical Calibration Laboratory and are
traceable to NIST. Your system may include a custom calibration, or one of the standard calibra-
tions offered in Table 1.
Part No. Calibration Description Typical Units
SCC-LU Luminance of Source Display luminance of a uniform
source
Foot-Lamberts
SCC-RA Radiance of Source Display radiance of a source, inte-
grated over specified bandwidth
W/m2/sr
SCC-PS Power Input Display total input power at a speci-
fied wavelength
W
SCC-PM Power Input Display total input power at multiple
wavelengths, from 300 to 1100 nm
W
SCC-LF Luminous Flux Input Display input luminous flux lumens
SCC-AL Alternate Units Display luminance in different units Lamberts, cd/m2
Table 1. Standard integrating sphere calibrations offered by Labsphere.
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SX-01635-000, Rev. 5 2
One of several standard Labsphere software packages may accompany your SC-5500, or you
may want to write your own programming to control the SC-5500 and peripheral components. A
discussion of the different software packages is provided in your system manual.
Special symbols are used in this manual. Triangular shaped symbols indicate a danger or warn-
ing.
Electrical Shock Hazard
Caution
TALK
LISTEN
REMOTE
FUNCTIONS
CAL ZERO NORM AUTO
OPTIONS
DATA ADJUST RANGE
INTEGRATING SPHERE SYSTEM CONTROL
SC 5500
labsphere
Figure 1. SC-5500 integrating Sphere System Control.
!
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SX-01635-000, Rev. 5 3
Unpacking and Inspection
The SC-5500 Integrating Sphere System Control was thoroughly inspected and calibrated before
shipping and should be ready to operate after completing the set-up instructions. All Labsphere
instrumentation is packaged and shipped in reinforced shipping containers. Carefully check the
components after unpacking for any damage that may have occurred during shipping. If there is
any such damage, file a claim immediately with the freight carrier and contact the Labsphere
Customer Service Department at
(603) 927-4266.
The following standard items should accompany your SC-5500 shipment:
• SC-5500 instrument with instruction manual
• Power cord
• Rack mounting hardware (for rack mount option only)
• Foot pads (table mount option only)
• Calibration documentation
The following items either are provided with peripheral components or must be provided by the
customer:
• Computer control cable (9-pin connector)
• Component control cable
• Detectors and detector cabling
• Software
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SX-01635-000, Rev. 5 4
Installation and Assembly
The primary assembly instructions for your Labsphere system is contained in your system
instruction manual. The assembly information here covers the rack mounting procedure and SC-
5500 setup for stand-alone operation. The triax detector cable connectors on the back panel of
the SC-5500 instrument are specifically designed to accommodate standard Labsphere detector
inputs. You should refer to the Detectors section of this manual before connecting a non-stan-
dard detector to the SC-5500.
CAUTION: Make all connections with the AC line power OFF.
Line Voltage Input Module
The AC line voltage input module, located on the rear panel, features a fuse holder and voltage
cartridge that displays the factory-set line input voltage (115 or 230 VAC). The 115 volt setting
has an effective range of 100-120 volts. The 230 volt setting has an effective range of 220-240
volts. Although the module should be configured for your power source at delivery, you should
check the voltage setting before making the electrical hookup.
The appropriate line voltage for the SC-5500, either 115 or 230 VAC, was set prior to ship-
ping, however it can be changed externally. Double check that the correct line voltage is set on
the line voltage input module. Failure to operate the unit at the appropriate line voltage may
cause serious damage. Refer to the Line Voltage Input section.
To check the voltage configuration of your instrument examine the text in the display window of
the input module as shown in Figure 2. The text display visible in the window should read either
115V or 230V, depending on your power source. If the voltage setting does not agree with the
power source you intend to use, proceed as follows to change the voltage configuration:
1. Remove the power cord from the back panel connector.
2. Using a slotted screwdriver, gently pry up the plastic tab on the left end of the mod-
ule. Reach in with the screwdriver or your fingers and extract the voltage cartridge.
3. Flip the cartridge around so that the desired voltage text reading, either 115 or 230
VAC, is oriented in the manner shown in Figure 2.
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SX-01635-000, Rev. 5 5
4. Reinstall the cartridge in the module and replace the plastic tab.
5. Check the voltage reading in the display window.
Rack Mounting
The SC-5500 Integrating Sphere System Control is sold in two design configurations. The table
top version features padded feet underneath the instrument enclosure for mounting on a flat sur-
face. The rack-mount version is shipped without feet but with rack-mounting hardware. Lab-
sphere rack-mounted instruments are constructed to fit standard ANSI/EIA-310D-1992 19"
electronics racks. Proceed as follows to mount the SC-5500 in your rack:
1. Secure the two mounting brackets shown in Figure 3 to either side of the instru-
ment enclosure.
Lift tab with
slotted screwdriver
to set voltage or
to change fuse
Position the
cartridge so the
appropriate
voltage is displayed
in the window
Replace fuses with
p
rescribed electrical
ratings only
115V
115V
230V
Attach the
power cable
here
100-120/220-240VAC 50/60 Hz
1A/0.5A
F0.5A/ 250V
CAUTION:
DISCONNECT LINE CORD
BEFORE SERVICING. FOR
CONTINUED PROTECTION
AGAINST FIRE HAZARD
REPLACE FUSE WITH
SAME TYPE AND RATING.
!
Figure 2. Checking the voltage configuration on your instrument. To operate
the SC-5500 on 230VAC, two fuses are required.
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SX-01635-000, Rev. 5 6
2. Locate the T-nuts provided with the electronics rack assembly and position them on
the rack as shown in Figure 4 at the instrument locations desired. Since the SC-
5500 has a display screen, you may want to mount the instrument in a top position
3. Install the chrome mounting screws through the brackets and into the T-nuts for
each instrument. Secure the fastener with a Phillips screwdriver.
Figure 3. Installing rack-mounted instrument brackets on the instru-
ment enclosure.
Slide
Figure 4. Install T-nuts
into the rack on each side.
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SX-01635-000, Rev. 5 7
Electrical Cable Hookup
The SC-5500 instrument delivery includes only a single power cord. Cable connection to periph-
eral components depends on the configuration of the integrating sphere system. If you purchase
a complete system from Labsphere, the necessary cabling may be packaged with other compo-
nents.
1. The SC-5500 will operate by computer control, either RS232C or IEEE-488, or as
a stand-alone unit. If you decide to use the RS-232C connector, you will need a null
modem to reverse the RX and TX cable leads. Otherwise, you will need an IEEE-
488 cable and control board.
CAUTION: Make all connections with the AC line power OFF.
2. Communications with the VAC-1000 Variable Attenuator Control, DM-1000
Detector Multiplexer or lamp power supply is maintained through the DB37 con-
nector on the SC-5500 rear panel. Make the cable hookup between the SC-5500
connector and the individual connectors on your peripheral instrumentation.
3. Make the detector cable hookup between your detector and the corresponding input
connector on the back panel of the SC-5500. The SC-5500 detector inputs require a
TRIAX connector. You can connect up to two different detectors to the back panel
of the SC-5500. You can monitor only one detector at a time.
Figure 4. Mount the instrument and bracket into
the electronics rack.
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SX-01635-000, Rev. 5 8
4. Connect the power cord between the instrument and an available wall socket.
5. Turn the instrument on and check for proper operation.
6. Load the Labsphere software package on your computer and configure the commu-
nications link with the SC-5500 instrument.
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SX-01635-000, Rev. 5 9
System Description and Operation
There are two basic functions the SC-5500 provides for your integrating sphere system: the
instrument displays the detector output, in either radiometric or photometric units, and exercises
operating control over selected optical instruments. The instrument control function requires use
of a host computer with either a standard Labsphere software package or your own software.
At the heart of the instrument is a Zilog Z180 8-bit microprocessor that performs all data collec-
tion and system control duties. The Z180 chip is an enhanced version of the time-tested Z80
MPU that featuring 1 Mb MMU, two DMA channels and 8 MHz on-chip oscillator. A functional
block diagram of the instrument is provided in Appendix B. The radiometer features two detec-
tor inputs - one for current and one for voltage operation. Voltage signals from both detector
channels are amplified and digitized before providing input to the microprocessor. Data process-
ing commands for the microprocessor are held in system memory by a 8-bit 32K EPROM chip
along with the necessary calibration data for displaying detector readings. The calibration data is
embedded into the EPROM at Labsphere and provides accurate readings only when used in the
configuration specified by the calibration documentation.
Automatic or manually controlled ranging is provided for each detector channel over a control
bus and three gain control networks. The gain network for the detector current channel consists
TALK
LISTEN
REMOTE
FUNCTIONS
CAL ZERO NORM AUTO
OPTIONS
DATA ADJUST RANGE
INTEGRATING SPHERE SYSTEM CONTROL
SC 5500
labs
p
here
labsphere
115V
AC Voltage Input Module
Detector TRIAX Input Connectors
SC-5500 Control Output Port Connector
RS-232 Connector
IEEE Connector
Figure 5. Front and back panels of the SC-5500 instrument.
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SX-01635-000, Rev. 5 10
of a resistive bridge circuit operated by six low voltage relays. Seven decades of current amplifi-
cation are available. The five decades of ranging for the detector voltage channel is accom-
plished in two stages. A resistive bridge network operated by a single relay pre-conditions the
voltage signal before it reaches the multiplexer. The second stage of ranging for the voltage
channel is accomplished in the JFET amplification circuit of the post amplifier.
The radiometer can be operated locally at the front panel of the instrument or from the host com-
puter. Local operation is achieved through the use of seven control buttons that cycle the user
through a sequence of menus. When connected to a detector and turned on, the SC-5500 takes
continuous detector readings, displaying the results in the LCD display on the front panel or
through the Windows software application on the host computer.
Detector Input
Triax connectors for two detector channels are provided on the back panel of the SC-5500. The
connector labeled Silicon/Germanium should be used for current-based detectors such as the
Labsphere SDA-050-U or the GDA-050-U photodiode assemblies. Current-based photodiodes
are the most common form of light detection today - you will use the Silicon/Germanium con-
nector for most of your applications. The SC-5500 and Labsphere photodiode detectors operate
in photovoltaic mode. The connector labeled Thermopile/Lead Sulfide/PMT should be used for
voltage-based detector systems such as the Labsphere PDA-050 photomultiplier tube. If you
have both current and voltage based detectors, you can monitor the two detector inputs by
cycling between the CAL0 and CAL1 options using the CAL function button on the SC-5500
front panel. If you need to monitor the signal input from more than one current-based detector,
you will need to purchase a DM-1000 Detector Multiplexer.
The SC-5500 detector input channels are configured to accommodate Labsphere detector assem-
blies. Labsphere photodiode detectors are wired in a manner opposite to most detectors. The
positive detector signal output from the semiconductor is wired to the center ring of the detector
+
+
-
-
SDA-050-U
PDA-050
TRIAX Cable
SC-5500
TRIAX Cable
Silicon
Germanium
Thermopile
Lead Sulfide
PMT
Figure 6. Wiring a custom detector to the SC-5500.
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SX-01635-000, Rev. 5 11
assembly TRIAX output connector - the negative lead is wired to the center pin. If you decide to
connect your own photodiode detector to the SC-5500, you may need to reverse the detector
leads. A simple electrical diagram is shown in Figure 6. The Thermopile/Lead Sulfide/PMT con-
nector is wired in the normal fashion. Both connectors on the SC-5500 instrument are TRIAX
configured. You may need an adapter if your detector uses a BNC cable.
SC-5500 Computer Interface
The rear panel of the SC-5500 provides standard RS-232C and IEEE-488 connectors for main-
taining communications with the computer. You can elect to use either communications proto-
col. If your integrating sphere system includes one or more peripheral instruments, you must
establish a computer link for control of these devices.
If you decide to use the IEEE-488 computer interface, you will need a GPIB board and IEEE-
488 cable. Normally, these items are not provided by Labsphere. The default IEEE address for
the SC-5500 and most Labsphere software applications is 10. Values between 1 and 15 are possi-
ble. To set the primary address on the radiometer, scroll to the IEEE ADDRESS menu option
using the OPTIONS button and select your new address using the Up ∆and Down ∇buttons on
the front panel. Refer to your system manual when setting the IEEE address in your software
application.
You will need a null modem if you decide to use the RS-232C communications interface. If your
SC-5500 was purchased as part of an integrating sphere system, the null modem is provided.
Refer to your system manual when configuring the serial port in your software application.
Lamp Power Supply, Detector Multiplexer and Variable Attenuator Operation
A custom designed cable connecting the SC-5500 with a lamp power supply, variable attenuator,
detector multiplexer, or other peripheral accessory normally is supplied when your SC-5500 is
part of an integrating sphere system. This cable connects to the DB37 connector on the rear
panel of the radiometer and the input connectors of your peripheral equipment. A total of 32 out-
put bits are provided on the DIGITAL OUTPUT CONTROL connector. The pinout for the con-
nector is given in Table 2. There are no input bits.
Not all 32 bits over the DIGITAL OUTPUT CONTROL port are available for custom use. The
DM-1000, VAC-1000 and lamp power supplies all utilize a certain number of the bits. The num-
ber and identification of the bits available to the user depends on system configuration. The lamp
power supplies each use up a single bit, for example. The bits utilized by the VAC-1000 depend
on the number of variable attenuator units attached. A map describing the utilization of SC-5500
output bits is provided in Appendix B.
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SX-01635-000, Rev. 5 12
Operating Procedures
All SC-5500 hardware features except the control of peripheral equipment are duplicated in the
standard Labsphere software applications. System operating procedures are provided in your
system instruction manual. The following procedures pertain to stand-alone operation of the SC-
5500.
Start Up
1. Press the POWER button on the front panel of the instrument. All LED indicators
will light up briefly, and go out when the system has initialized. The Power indica-
tor LED should remain on and the CAL1 default display will read detector current
in the LCD display.
2. Toggle though the Calibration Menu using the CAL button and select the calibra-
tion display required.
3. Select the automatic range feature by pressing AUTO. The green LED above will
light up.
4. To record a dark current reading, extinguish your light source and observe the
detector reading on the LCD display. Press the ZERO button to store the dark cur-
rent measurement into memory.
5. Turn on your light source and observe the readings on the LCD display. You can
stabilize the detector readout by enabling the digital filter. To do this, invoke the
DIGITAL FILTER menu option using the OPTIONS button and press the Up ∆ or
Down ∇ button.
Shutdown
When SC-5500 operation is no longer required, press the POWER button.
Pin Port No. Bit No. Pin Port No. Bit No. Pin Port No. Bit No.
1 1 1142 6263 5
2 1 2152 7273 6
3 1 3162 8283 7
4 1 4173 1293 8
5 1 5183 2304 1
6 1 6193 3314 2
7 1 7 20 Gnd NA 32 4 3
8 1 8 21 Gnd NA 33 4 4
9 2 1 22 Gnd NA 34 4 5
10 2 2 23 Gnd NA 35 4 6
11 2 3 24 Gnd NA 36 4 7
12 2 4 25 3 4 37 4 8
13 2 5
Table 2. Pinout and port designation for the rear panel DB37 connector.
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SX-01635-000, Rev. 5 13
User Interface
In the stand-alone mode of operation, SC-5500 control is obtained through the buttons on the
front panel of the instrument. A list of SC-5500 control features is provided here for user refer-
ence. The front panel of the SC-5500 is illustrated in Figure 1.
POWER
Power to the SC-5500 Integrating Sphere System Control is activated through the front-panel
rocker switch. Pressing the switch to the ON Iposition activates instrument power, turns on the
green light directly above the power switch, and a enables the LCD display. Pressing the switch
to the OFF Oposition deactivates the instrument.
LCD Display
The display panel consists of a two-row backlit LCD digital readout. It may be set for either ana-
log or digital readings. The backlight may be turned off for dark room use. The LCD window
displays a continuous detector readout during normal radiometer operation. When accessing SC-
5500 control features, the window displays the menu options associated with each feature. To
return to the detector readout display at any time, press the CAL button.
CAL
The CAL button provides operator access to the pre-programmed calibration coefficients
embedded within the SC-5500 firmware. When the CAL button is selected, the LCD window
displays the detector readout using the currently selected calibration coefficient. At startup, the
CAL1 calibrated readout will be displayed. To switch the radiometer to an alternate calibration,
press CAL repeatedly until the appropriate calibration coefficient is displayed.
OPTIONS
The OPTIONS button gives the operator access to the programmed features of the SC-5500 Inte-
grating Sphere System Control. Repeated selection of this button scrolls the user through the
Options Menu in the order displayed by Figure 7. The operator can scroll through the possible
parameter options for each menu option through the Up ∆ or Down ∇ buttons at the right. The
selections from the Options Menu are not stored on EPROM - the next time you power up your
SC-5500, the default parameters will be restored.
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SX-01635-000, Rev. 5 14
If your SC-5500 is part of an integrating sphere system with Labsphere software, the software
application can access the non-communications parameters on the Options Menu. When the SC-
5500 powers up, the default parameters will always be restored. By applying the lock mode to
the instrument during operation, you can disable the buttons on the front panel of the instrument.
In the lock mode, only software configurations are effective. The lock mode is released automat-
ically when you exit the software application. The lock mode feature may not be available on all
Labsphere software applications.
3 1/2 and 4 1/2 Digit Display
The detector readout can be displayed in the LCD window using three or four decimals. Appli-
cation of calibration coefficients may decrease this resolution. The default parameter is 3 1/2
DIGITS.
Display Format
The LCD display format can be switched between DIGITAL, which shows the measurement
along with the units, or ANALOG, which shows the measurement along with a proportional
sliding-bar graph. The default setting at power up is DIGITAL.
Digital Filter
Enabling the digital filter reduces background fluctuations, thereby providing more stable read-
ings. Disabling the filter provides quicker, continuous readings. The default setting at power up
is DISABLED.
Front Panel Lights
The LED indicators on the front panel can be toggled on or off. The off position reduces ambient
light in a dark room situation. The default setting at power up is ENABLED.
Back Light
The LCD display back light can be toggled on or off. The off position reduces ambient light in a
3 - 4 DIGIT DISPLAY
1212
ANALOG OR DIGITAL DISPLAY
FRONT PANEL LIGHTS
BACK LIGHT
IEEE ADDRESS
BAUD RATE
PARI TY
DATA FORMAT
RESPONSIVITY
DIGITAL FILTER
OPTIONS
CAL
CAL0 Detector Voltage
CAL1 Detector Current
CAL2 Luminance (ft-Lamberts)
CAL3 Luminance (cd/m )
CAL4 CustomCalibration
CAL5 CustomCalibration
CAL6 CustomCalibration
CAL7 CustomCalibration
CAL8 CustomCalibration
CAL9 CustomCalibration
2
Figure 7. Menu item sequence in the SC-5500 firmware.
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SX-01635-000, Rev. 5 15
dark room situation. The default setting at power up is ENABLED.
IEEE Address
You can program the SC-5500 for a different IEEE address if the default address is already taken
by another piece of equipment. The possible addresses include any number between 1 and 15,
inclusive. Do not choose an address that conflicts with the address of another device in the sys-
tem. This option is for computer interfacing with an IEEE-488 bus only and has no affect on
stand-alone operation. The default address at power up is 10. If you want a different permanent
IEEE address, the custom firmware must be programmed into your SC-5500 EPROM.
Baud Rate, Parity and Data Formats Parameters
These parameters remain in the SC-5500 firmware for purposes of backwards RS-232C compat-
ibility.
Responsivity
This menu option displays the calibration coefficients embedded in your SC-5500 EPROM firm-
ware. The coefficients match the data in the calibration documentation accompanying your inte-
grating sphere system.
ZERO
The ZERO button should be used for recording a dark current reading before taking measure-
ment data. When the operator presses this button, the most recent detector reading is stored in
memory and subtracted from all subsequent readings. The green LED above the ZERO button
will be lit when the feature is enabled.
NORM
The NORM feature allows the operator to normalize detector readings to a previously saved
value. When this button is pressed, all subsequent readings are divided by the current detector
readout. If the total measured detector readout drops below the value that was present when the
zero was initiated, the instrument will display negative numbers. These negative numbers are
unreliable and should not be used. The green LED above the NORM button will be lit when the
feature is enabled.
AUTO
The AUTO button enables the automatic detector amplification ranging feature of the SC-5500.
When enabled, the detector readout is displayed using the most readable format in the LCD win-
dow. The operator can manually set the operating range for the detector by using the Up ∆ and
Down ∇ buttons. These buttons under the RANGE heading on the front panel allow detector
sensitivity adjustment by changing the pre-amplifier gain of the SC-5500. Pushing these two
buttons causes the running display to scroll through the ranges of the detector. For current-based
detectors, seven decades of ranging are available; for voltage-based detectors, the operator can
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SX-01635-000, Rev. 5 16
scroll through five decades. A green light above the AUTO button indicates when the instrument
is in the automatic ranging mode.
If the signal from the detector exceeds the set dynamic range, the display will read OVER-
FLOW. In this case, the sensitivity of SC-5500 Integrating Sphere System Control must be
decreased or the radiant flux on the detector reduced before the display will function properly
again.
TALK
A green light indicates when the SC-5500 Integrating Sphere System Control is sending infor-
mation through the IEEE-488 or the RS-232C interface to a remote computer terminal.
LISTEN
A green light indicates when the SC-5500 Integrating Sphere System Control is receiving infor-
mation through the IEEE-488 or the RS-232C interface from a remote computer terminal.
REMOTE
A green light indicates that the SC-5500 Integrating Sphere System Control is being operated by
a remote computer in lock mode, and that the front-panel control buttons are deactivated.
Calibration
If your SC-5500 accompanies an integrating sphere system, the instrument will be calibrated to
read out in the units of your choice when operated with the system. The calibration coefficients
embedded in the SC-5500 firmware is not valid for other systems or with different detectors. The
radiometer also can be used, however, to display the detector voltage or detector current. Cali-
bration coefficients for CAL0 and CAL1 are installed on all SC-5500 radiometers to display
detector voltage and current respectively. The CAL2, CAL3,...,etc. calibrations are reserved for
the standard part numbers listed in Table 1 or for custom calibrations. Up to 100 different cali-
brations are possible. The Calibration Certificate accompanying your system delivery describes
the methods and equipment used for the specified calibrations. A sticker certifying the accuracy
of the SC-5500 Integrating Sphere System Control calibration, the calibration date, and the sug-
gested date to send the instrument back for recalibration is located on the rear panel. Labsphere
maintains records of all calibrations completed. If you should wish to use new or different equip-
ment with the SC-5500, contact the Labsphere Customer Service Department at (603) 927-4266.
Your sales representative can arrange for you to send the equipment along with the SC-5500
Integrating Sphere System Control and the rest of the system to Labsphere for proper calibra-
tion.
During the calibration of your SC-5500, the luminance or radiance output from your sphere was
measured along with detector voltage or current. The results of these measurements are available
in the calibration documentation. A detector responsivity and correction multiplier is recorded
along with each calibration in the documentation. The correction multiplier is the arithmetic
inverse of detector responsivity and should be entered into the Labsphere software application
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SX-01635-000, Rev. 5 17
after installation on your computer. The same responsivities and correction multipliers discussed
above are embedded into the EPROM in your SC-5500 so the instrument can be operated
remotely or in stand-alone mode.
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