Konica Minolta CM-3700A User manual

SPECTROPHOTOMETER
CM-3700A
INSTRUCTION MANUAL
Before using this instrument,
please read this manual.

Safety Symbols
The following symbols are used in this manual or CM-3700A to prevent accidents
which may occur as a result of incorrect use of the instrument.
Denotes an instruction regarding a safety warning or note.
Read the instruction carefully to ensure safe and correct use.
Denotes an instruction regarding the risk of electric shock.
Read the instruction carefully to ensure safe and correct use.
Denotes an instruction regarding the risk of fire.
Read the instruction carefully to ensure safe and correct use.
Denotes a prohibited action.
This action must never be performed.
Denotes an instruction.
This instruction must be strictly adhered to.
Denotes a prohibited action.
Never disassemble the instrument.
Denotes an instruction.
Be sure to disconnect the AC adapter from the AC outlet.
This symbol indicates A.C.
This symbol indicates D.C.
This symbol indicates class II protection against electric shock.
Trademarks
• Windows® is a registered trademark of Microsoft Corporation in the United States and other countries.
Notes on this Manual
• Copying or reproduction of all or part of the contents of this manual without KONICA MINOLTA’s permis-
sion is strictly prohibited.
• The contents of this manual are subject to change without prior notice.
• Every effort has been made in the preparation of this manual to ensure the accuracy of its contents.
However, should you have any questions or find any errors, please contact your retailer or a KONICA
MINOLTA-authorized service facility.
• KONICA MINOLTA will not accept any responsibility for consequences arising from the use of the instru-
ment.

1
Safety Precautions
To ensure correct use of this instrument, read the following points carefully and adhere to them.
After you have read this manual, keep it in a safe place where it can be referred to anytime a question arises.
WARNING (Failure to adhere to the following points
may result in death or serious injury.)
Do not use the instrument in places where
flammable or combustible gases (gasoline,
etc.) are present.Doing so may cause a fire.
Do not disassemble or modify the
instrument or the AC adapter. Doing
so may cause a fire or electric shock.
Always use the AC adapter supplied as
a standard accessory or the optional AC
adapter, and connect it to an AC outlet
of the rated voltage and frequency. If an
AC adapter other than those specified by
KONICA MINOLTA is used, it may result in
damage to the unit, fire or electric shock.
Take special care not to allow liquid or
metal objects to enter the instrument.
Doing so may cause a fire or electric
shock. Should liquid or metal objects
enter the instrument, turn the power
OFF immediately, disconnect the
AC adapter plug from the AC outlet,
and contact the nearest Konica
Minolta-authorized service facility.
If the instrument will not be used for a
long time, disconnect the AC adapter
plug from the AC outlet. Accumulated
dirt or water on the prongs of the
AC adapter’s plug may cause a
fire and should be removed.
The instrument should not be operated if it
is damaged or the AC adapter is damaged,
or if smoke or odd smells occur. Doing
so may cause a fire. In such situations,
turn the power OFF immediately,
disconnect the AC adapter plug from the
AC outlet and contact the nearest Konica
Minolta-authorized service facility.
Do not forcibly bend, twist, or pull the AC
adapter power cable. Do not scratch or alter
the power cable or place heavy objects
on it. Doing so may damage the power
cable and cause a fire or electric shock.
Always hold the plug itself when
disconnecting the AC adapter plug
from the AC outlet. Pulling on the
power cable may damage it and
cause a fire or electric shock.
Insert the power plug fully and
securely. Incomplete inserting may
cause fire or electric shock.
Do not insert or disconnect the AC adapter
plug from an AC outlet with wet hands.
Doing so may cause electric shock.
CAUTION (Failing to adhere to the following points may result in
injury or damage to the instrument or other property.)
Do not perform measurement with the
specimen measuring port
directed towards your eyes.
Doing so may damage your eyes.
Do not place the instrument on an
unstable or sloping surface. Doing so
may result in its falling or overturning,
causing injury. Be careful not to drop
the instrument when carrying it.
Be careful not to get your hand caught in
the openable section of the instrument.
Doing so may result in injury.
When carrying the instrument, fix it with tape,
etc. to prevent the transmittance specimen
chamber cover from opening and closing.
Doing so may result in your hand caught by
the cover and result in injury.
Make sure that the AC outlet is located
near the instrument and that the AC
adapter plug can be connected to and
disconnected from the AC outlet easily.
When cleaning, disconnect the power plug.
Connecting may cause electric shock.

2
INTRODUCTION
This spectrophotometer is designed for spectral measurement of color and color differences in
various industries. It can measure both reflected and transmitted color with high accuracy.
Packing Materials
General Packing Materials
Keep all packing materials (cardboard box, cushioning material, plastic bags, etc.) in a safe
place. The CM-3700A is a precision measuring instrument. They can be used to protect the
instrument from impact and vibration during shipment to Konica Minolta for maintenance.
Should they be lost or damaged, contact the nearest Konica Minolta-authorized service facility.
Protective cap for the specimen measuring port (integrating sphere opening)
The CM-3700A is delivered with no target mask attached. To protect the specimen
measuring port, a protective cap is attached to the specimen measuring port.
This protective cap must be removed before using the CM-3700A.
When you transport the CM-3700A to another place, the protective cap
must be attached. Keep the protective cap in a safe place after putting it in the accessory case (CM-A156).
Protective cap

3
Notes on Use
Be sure to use this instrument properly. Use of this instrument in ways other than those specified in
this manual may result in risk of injury, electric shock, instrument damage, or other problems.
Operating Environment
• Use the CM-3700A at an ambient temperature between 13°C and 33°C and relative humidity 80% or less (at
33°C) with no condensation. Be sure to use the instrument within this range. Do not use it in areas of rapid
temperature changes.
• Do not leave the CM-3700A in direct sunlight or near sources of heat, such as stoves, etc. The internal
temperature of the instrument may become much higher than the ambient temperature in such cases.
• Do not use the CM-3700A in areas where dust, cigarette smoke or chemical gases are present. Doing so
may cause deterioration in performance or a breakdown.
• Do not use the CM-3700A near equipment which produces a strong magnetic field (such as speakers, etc.).
• The CM-3700A belongs to installation category I products (equipment which is powered by an AC adapter-
connected to commercially available power).
• The CM-3700A belongs to pollution degree 2 products (equipment which may cause temporary electrical
hazards due to contamination or condensation or products which are used in such an environment).
• Do not use the CM-3700A at altitudes higher than 2,000 m.
• The CM-3700A and the AC adapter supplied as a standard accessory have been designed exclusively for
indoor use. They should never be used outdoors because rain or other factors may damage the instrument.
Measurement
• Make sure no dirt or dust get into the specimen measuring port.
• When using the instrument for long periods of time, the measurement value may change depending on
changes in the environment. Therefore, in order to achieve accurate measurements, we recommend that
white calibration be done regularly using the White Calibration Plate.
White Calibration Plate
• The calibration data for the White Calibration Plate was measured at 23°C.
To achieve the highest accuracy when measuring absolute values (colorimetric values), calibration and
measurement should be performed at 23°C.
• Do not allow the White Calibration Plate to get scratched or stained with such as fingerprints.
• Do not move the White Calibration Plate while it has been caught by the sample holder. Doing so may
damage the White Calibration Plate.
• When the White Calibration Plate is not in use, be sure to close the cover so that the White Calibration
Plate is not exposed to ambient light.
Target Mask
• Do not touch the Target Mask’s inner surface (white-coated surface) by hand, scratch it or make it dirty.
• When not in use, Target Masks should be stored in the accessory case (CM-A156) so that they will not be
exposed to ambient light.
Power Source
• Make sure that the power switch is set to OFF (“ I “) when the CM-3700A is not in use.
• Always use the AC adapter supplied as a standard accessory (AC-A308) and connect it to an AC outlet of
the rated voltage and frequency.
• Use an AC power supply of the rated supply voltage (within ±10%).
• Do not connect the AC adapter to an overloaded electrical circuit. In addition, do not wrap or cover the AC
adapter with cloth or other material while in use. Doing so may cause an electric shock or fire.

4
System
• Do not subject the CM-3700A to strong impact or vibration. Doing so may cause deterioration of perfor-
mance or breakdown.
• The specimen measuring port and integrating sphere are extremely precise components, and great care
should be taken to prevent them getting dirty or exposing them to impacts. When the CM-3700A is not in
use, be sure to attach a target mask to the measuring port to prevent entry of foreign matter.
• The CM-3700A may cause interference if used near a television, radio, etc.
• Since the CM-3700A uses a microcomputer, external magnetic noise may cause malfunction. In this case,
turn the power OFF, and wait 30 minutes, and then turn it ON again.
About Transmittance Measurement
• Do not spill a specimen or other liquid on the instrument. If any liquid is spilled on the instrument, wipe it off
immediately with a soft, dry cloth.

5
Notes on Storage
• The CM-3700A should be stored at temperatures between 0°C and 40°C, and at a relative humidity of 80%
or less (35°C) without condensation. Do not store the instrument in areas subject to high temperatures,
high humidity, sudden changes in temperature, or where freezing or condensation may occur, because
these circumstances may cause a breakdown. It is recommended to store the CM-3700A with a drying
agent at a temperature around 20°C.
• Do not leave the CM-3700A inside a car such as in the trunk. Otherwise, the temperature and/or humidity
may exceed the allowable range for storage during midsummer or midwinter, resulting in a breakdown.
• Keep the packing materials used for shipment and use them to transport the CM-3700A. This protects the
instrument from sudden changes in temperature, vibration, and shock.
• Do not store the CM-3700A in areas where dust, cigarette smoke or chemical gases are present. Doing so
may cause deterioration in performance or a breakdown.
• Entry of dust into the specimen measuring port will hinder accurate measurement. When the instrument
is not in use, you must close the transmittance chamber cover and cover the instrument with the supplied
Dust Cover to prevent the entry of dust into the integrating sphere.
• The White Calibration Plate may become discolored if left exposed to light. Therefore, make sure to close
the cover when it is not in use so that the White Calibration Plate is not exposed to ambient light during
storage.
• The Target Masks may discolor if they are left exposed to light. When they are not in use, keep them in a
safe place to prevent exposure to light and to protect them from scratches and dust. And store them in the
accessory case (CM-A156).
• Take care not to leave the CM-3700A for a long period of time with a target mask attached. The sample
holder may stick to the target mask.
• Be sure to keep all packing materials (cardboard box, cushioning material, plastic bags, etc.). They can be
used to protect the instrument during transportation to the service facility for maintenance (re-calibration
etc.).
Notes on Cleaning
• If the CM-3700A becomes dirty, wipe it with a soft, clean dry cloth. Never use solvents such as thinner or
benzene.
• If the White Calibration Plate becomes dirty, wipe it with a soft, clean dry cloth. If dirt is difficult
to remove, wipe it off with a cloth dampened with commercially-available lens cleaning solution.
Then remove the solution with a cloth dampened with water, and leave the plate to dry.
• If the inner surface (white-coated surface) of the Target Masks, or the inside of the integrating sphere, get-
dirty, contact a Konica Minolta-authorized service facility.
• Should the CM-3700A break down, do not try to disassemble and repair it by yourself. Contact a Konica
Minolta-authorized service facility.
Disposal Method
• Make sure that the CM-3700A and its accessories and packing materials are either disposed of or recycled
correctly in accordance with local laws and regulations.

6
CONTENTS
Safety Precautions .................................. 1
INTRODUCTION ....................................... 2
Packing Materials ................................................. 2
Notes on Use ........................................................ 3
Notes on Storage.................................................. 5
Notes on Cleaning ................................................ 5
Disposal Method ................................................... 5
CONTENTS ............................................... 6
Using the CM-3700A
Standard Accessories ............................. 8
Optional Accessories .............................. 9
System Diagram .................................... 10
Names and Functions of Parts ............. 11
Measurement Procedure ....................... 12
Flow of Preparation and Measurement .............. 12
Connecting a Personal Computer ........ 13
Connecting the AC Adapter .................. 14
Turning Power ON and OFF .................. 15
Attaching a Target Mask ........................ 16
Notes on Use of Target Mask ............................. 16
Calibration of Reflectance and
transmittance measurements ............... 17
Calibration for Reflectance Measurements ........ 17
White calibration data ......................................... 17
Calibration for Transmittance Measurements ..... 17
100% calibration data ......................................... 17
Performing calibration ......................................... 18
Attaching the Zero Calibration Box ..... 19
Notes on Use of Zero Calibration Box ................ 19
Attaching the White Calibration Plate .. 20
Notes on Use of White Calibration Plate ............ 20
Updating White Calibration Data ........................ 20
Attaching the Transmittance Zero
Calibration Plate (Optional Accessory) ..... 21
Notes on Use of Transmittance Zero Calibration Plate ... 21
Performing 100% calibration ................ 22
S etting up instrument for 100% calibration to air.... 22
Setting up instrument for 100% calibration to water ... 22
Setting a Specimen ............................... 23
Reflectance measurement ................................. 23
The sample holder for measuring the reflectance ... 24
About opacity measurements ............................. 24
Transmittance measurements ............................ 25
The transmittance chamber for transmittance measurement .... 26
About haze measurements ................................. 26
Cleaning the CM-3700A and Accessories ... 27
Zero Calibration Box and White Calibration Plate .. 27
Target Mask ....................................................... 27
Inside Integrating Sphere ................................... 27
Receiving Window ............................................. 28
ERROR MESSAGE ................................. 29
TROUBLESHOOTING GUIDE ................ 31
Explanations
lIIumination/Observation System ......... 34
Measuring Reflected Colors ............................... 34
Measuring Transmitted Colors ............................ 34
Illumination and Measurement Areas .. 35
Target Mask ....................................................... 35
Measurement Area ............................................. 35
System Configuration ........................... 35
Fluorescent Measurement .................... 36
UV Adjustment ................................................... 36
WHEN FLUORESCENT CALIBRATION IS
PERFORMED .................................................... 36
WHEN FLUORESCENT CALIBRATION IS NOT
PERFORMED .................................................... 36
Dimensions ............................................ 37
Specifications ........................................ 38

7
Using the CM-3700A

8
White Calibration Plate CM-A154
Used to perform white calibration for measurement
of reflectance and to perform measurement
of transmittance. A CD-ROM containing white
calibration data and software for writing the white
calibration data is supplied with this accessory.
Target Mask CM-A91
CM-A92
CM-A93
Used to change the illumination area (measurement
aperture) according to the specimen.
Measurement and illumination (aperture area at specimen
surface) areas for each target mask are as follows:
CM-A91 (SAV) : 3 × 5 mm / 5 × 7 mm
CM-A92 (MAV) : ø8 mm / ø11 mm
CM-A93 (LAV) : ø25.4 mm / ø30 mm
Zero Calibration Box CM-A155
Used to perform zero calibration for measurement
of reflectance and to perform haze measurement
at measurement of transmittance.
AC Adapter AC-A308
Used to supply power from an AC
outlet to the CM-3700A.
Input: 100 to 240 V 50/60 Hz
Output: 8 V 1.5 A
Plug design: Center-negative
USB Cable (3 m) IF-A21
Used to connect the instrument to
a personal computer (PC).
Accessory Case CM-A156
Dust Cover CM-A69
Standard Accessories

9
Software
SpectraMagic™ NX CM-S100w
This software provides various functions (e.g., data
processing and file management) and allows the user
to operate the CM-3700A using a personal computer.
Transmittance Specimen Holder CM-A96
Used to hold the specimen for measurement
of transmittance. It can hold specimens
up to 22.5 mm (7/8 in.) thick.
Plastic Cell
CM-A130 (optical path length 2mm)
CM-A131 (optical path length 10mm)
CM-A132 (optical path length 20mm)
This disposable plastic container is
used to hold liquid specimens.
Cell
CM-A97 (optical path length 2mm)
CM-A98 (optical path length 10mm)
CM-A99 (optical path length 20mm)
This glass container is used to hold liquid specimens.
Transmittance Zero Calibration Plate CM-A100
Used when performing zero calibration
for transmittance measurements.
USB Cable (5 m) IF-A22
Used to connect the instrument to
a personal computer (PC).
Optional Accessories

10
System Diagram
Accessory Case
CM-A156
Dust Cover
CM-A69
Spectrophotometer
CM-3700A
ACAdapter
AC-A308
USBCables
IF-A21（3m）
USBCables
IF-A22（5m）
White Calibration
Plate CM-A154
(with CD-ROM containing
calibration data and
data-setting software)
Target Mask
CM-A91 (SAV)
Zero Calibration Box
CM-A155
Target Mask
CM-A92 (MAV)
(ø8 mm measurement /
ø11 mm illumination)
Target Mask
CM-A93(LAV)
(ø25.4 mm measurement /
ø30 mm illumination)）
Standard accessories Optional accessories
CM-S100w
Transmittance
SpecimenHolder
CM-A96
CM-A100
Cell
Cell
Professional Edition
Basic Edition
Personal Computer
CM-A130（2mm;setfor100）
CM-A131（10mm;setfor100）
CM-A132（20mm;setfor100）
CM-A97（2mm）
CM-A98（10mm）
CM-A99（20mm）
SpectraMagicTM NX
Transmittance
ZeroCalibrationPlate
(3×5 mm measurement /
5×7 mm illumination)

11
Names and Functions of Parts
① Transmittance chamber .............................Place the specimen in this chamber to perform
measurement of transmittance.
② Measurement port baseplate lock .............. Used to release the lock of the measurement port base plate.
③ Measurement port baseplate .....................Can be opened check position of specimen for reflectance
measurements.
④ Power switch .............................................. Used to turn power ON and OFF.
⑤ Sample holder ............................................Used to hold the specimen, white calibration
plate or zero calibration box.
⑥ Target mask ................................................ Select a suitable target mask (for 5×7mm (SAV), ø11mm
(MAV) and ø30mm (LAV) measurements) according
to the specimen and attach it to the CM-3700A.
⑦ Transmittance specimen chamber cover .... Covers the transmittance specimen chamber when slid closed.
⑧ USB connection terminal ............................ Used to connect the instrument to a PC with the supplied USB cable
(IF-A21 or IF-A22).
⑨ AC adapter input socket..............................Used to connect the AC adapter supplied with the CM-3700A.
8
9
4
5
3
1
2
7
6

Starting the software Start the software and set it for control of the CM-3700A.
Turning the power ON Turn the power ON. (P.15)
Starting the PC Turn on the PC to be used to control
(starting Windows) the CM-3700A.
Attaching a target mask Attach the target mask
to be used. (P.16)
Attach the LAV (Ø25.4 mm)
target mask and set the white
calibration plate in position. ( P.16 )
Performing zero calibration Position the zero calibration
box and perform zero
calibration. (P.19)
Position the Transmittance
Zero Calibration Plate and
perform zero calibration. (P.21)
Performing white (100%)
calibration
Position the white
calibration plate and perform
white calibration. (P.20)
Perform 100% transmittance
with nothing or a cell
containing distilled water in the
transmittance chamber. (P.22)
Positioning a specimen Position the specimen on / in the CM-3700A. (P.23)
Performing measurement Perform measurements.
Turning the power OFF When measurements are complete, turn the power OFF. (P.15)
Exit out of the software and turn off the PC.
Connecting the PC Connect the CM-3700A to the PC with the USB cable.
(P.13)
Connecting the AC adapter Connect the CM-3700A to the AC
outlet with the AC adapter. (P.14)
<Reflectance measurement> < Transmittance measurement >
12
Measurement Procedure

¥ This manual explains how to prepare the CM-3700A and how to set a specimen.

¥ The CM-3700A is controlled by a PC to perform measurements.

¥ For a description of measuring method using SpectraMagic™ NX
(optional), refer to the SpectraMagic™ NX instruction manual.
Flow of Preparation and Measurement

13
Connect the instrument to a PC with the supplied USB cable IF-A21 (3 m).
Memo • To connect the instrument with a PC, it is recommended that you use software that enables connection
and operation of the instrument (such as the optional Color Management Software SpectraMagic™ NX).
• The USB communication port of the instrument conforms to USB 1.1.

{To connect the instrument to a PC, you need to install the USB driver dedicated to the CM-3700A. Install
the USB driver supplied with the software that enables connection and operation of the instrument.

{The instrument is not designed to be powered via the USB cable. You need to connect the AC adapter.

{Make sure that the USB connector plug is oriented correctly and connected securely.

{When connecting/disconnecting the USB cable, be sure to hold the connector plug. Do not pull on or
forcibly bend the cable. Otherwise, wire breakage may result.

{Make sure that the cable has sufficient length. Putting tension on the cable may cause connection failure
or wire breakage.

{To connect the USB cable connector, check the shape of the receptacle (connection terminal) and insert
the connector fully until it is secured.
Connecting a Personal Computer
Operating Procedure
In general, a USB cable can be connected/disconnected while the instrument is turned ON; however,
you need to turn OFF the instrument in the procedure below. See P.14 for how to connect the AC adapter
and P.15 for how to switch the power on and off.
1. Turn OFF the instrument (Press the “  ” side
of the Power switch.).
2. Connect the B connector of the USB cable to
the USB connection terminal (B type) of the
instrument.

{Fully insert the connector and ensure secure
connection.
3. Connect the A connector of the USB cable to
the USB port of the PC.
4. Connect the AC adapter and turn ON the
instrument (Press the “ I ” side of the Power switch.) .

{When you are prompted to install the USB driver,
specify the USB driver included with the software
or the white calibration data CD and complete
the installation.

{When using the optional Color Management
Software SpectraMagic™ NX, refer to the
SpectraMagic™ NX Installation Guide.

{After installation of the USB driver has finished,
switch the instrument off for a few seconds and
then switch it back on.

14
WARNING
Always use the AC adapter supplied as a standard accessory or specified replacement AC
adapter with the CM- 3700A, and connect it to an AC outlet of the rated voltage and frequency.
Failure to do so may damage the CM- 3700A or the AC adapter, causing a fire or electric shock.
If the CM-3700A will not be used for a long time, disconnect the AC adapter from the AC outlet.
Accumulated dirt or water on the prongs of the AC adapter's plug may cause a fire and should be removed.
Do not insert or disconnect the AC adapter with wet hands. Doing so may cause electric shock.
Insert the power plug fully and securely. Incomplete inserting may cause fire or electric shock.
Do not disassemble or modify the AC adapter. Doing so may cause a fire or electric shock.
Do not unplug or plug in the AC adapter with the instrument’s power switch set to ON. Doing so may
cause malfunction.
Connecting the AC Adapter
Connecting Procedure
1. Make sure that the power switches of both
CM-3700A and host PC are set to OFF ("  ").
2. Insert the output plug of the AC adapter into
the AC adapter input socket on the rear of the
CM-3700A.
3. Insert the input plug of the AC adapter into an
AC wall outlet.

{The AC Adapter AC-A308 supplied as the
standard accessory must be used.

{Before disconnecting the AC adapter, the power
switch must be set to OFF (“  “).

15
WARNING
The CM-3700A should not be operated if the CM-3700A or the AC adapter is damaged, or smoke
or strange odors occur. Doing so may result in a fire. In such situations, turn the power OFF
immediately, disconnect the AC adapter from the AC outlet, and contact the nearest Konica Minolta-
authorized service facility.
Turning Power ON and OFF
Procedure
1. To turn the power ON and to light the lamp on
the power switch, set the power switch to ON
(“ I “) .
2. To turn the power OFF, set the power switch
to OFF (“  “).

16
WARNING
Do not place the CM-3700A on an unstable or sloping surface. Doing so may result in its
falling or overturning, causing injury. Take care not to drop the CM-3700A when carrying it.
Be careful around openings in the CM-3700A. Failure to do so
may result in fingers being trapped causing injury.
The CM-3700A allows you to select a target mask from the following three types according to the specimen
and your application.
Target mask
CM-A91 (for LAV 3×5 mm measurements: illumination area: 5×7 mm)
CM-A92 (for MAV ø8 mm measurements: illumination area: ø11 mm)
CM-A93 (for SAV ø25.4 mm measurements: illumination area: ø30 mm)
Attaching a Target Mask
Procedure
1. Pull the sample holder toward you and keep it
open.

{The sample holder will remain open when
opened more than 70 degrees.
2. Remove the currently attached target mask
by pulling it toward you.
Memo • The target mask is held on by magnets.
3. Align the target mask positioning holes of the
target mask to be attached with the target mask
positioning pins of the Spectrophotometer's
specimen port baseplate and slide the target
mask in against the specimen port baseplate.
Memo • The target mask should be attached in the direction
that makes the white painted surface face inside
(toward the CM-3700A side) and position the letters
“MADE IN JAPAN” at the top.
4. Release the sample holder to close it.
Notes on Use of Target Mask

{Take care not to scratch or make the inner surface (white-coated surface) of the target masks dirty with
such as fingerprints.

{The target masks may become discolored if left in areas exposed to light. Therefore, make sure that
target masks which are currently not in use are kept inside the accessory case (CM-A156) to prevent
exposure to light.

{When not using the CM-3700A, attach one of the target masks or the protective cap to prevent dust
entering the integrating sphere.

{Take care not to leave the CM-3700A for a long period of time with a target mask attached. The sample
holder may stick to the target mask.

17
Calibration for Reflectance Measurements
After the Spectrophotometer has been switched on, zero calibration and white calibration must
be performed before spectral reflectance measurements are taken. Zero calibration is performed
using the Zero Calibration Box (which has a reflectance of 0%) to set the zero reference point for
reflectance measurements; white calibration is performed using a white calibration plate (which
has a reflectance of approximately 100% and for which spectral reflectance data are provided as
white calibration data) to set a high-reflectance reference point for reflectance measurements.
White calibration data
The white calibration data of the White Calibration Plate are provided under the following six kinds of
measurement conditions. When the CM-3700A is purchased, these data are already set within the instrument.
• Measurement area : SAV (3 x 5 mm) / Specular component : SCI
• Measurement area : MAV (ø 8 mm) / Specular component : SCI
• Measurement area : LAV (ø 25.4 mm) / Specular component : SCI
• Measurement area : SAV (3 x 5 mm) / Specular component : SCE
• Measurement area : MAV (ø 8 mm) / Specular component : SCE
• Measurement area : LAV (ø 25.4 mm) / Specular component : SCE
Calibration for Transmittance Measurements
After the Spectrophotometer has been switched on, 0% calibration and 100% calibration must be performed
before spectral transmittance measurements are taken. 0% calibration is performed by blocking the light
path with an opaque material (a material which has a transmittance of 0%) to set the 0% reference point
for transmittance measurements. 100% calibration is performed using either air (when measuring solid
specimens) or distilled water (when measuring liquid specimens) to set a high-transmittance reference point
for transmittance measurements; in both cases (air and water) the transmittance is assumed to be 100% for
all wavelengths.
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{Since using the LAV target mask and setting the measurement area to LAV and the SCI/SCE setting
to SCI provides the most stable data for transmittance measurements, it is recommended that
transmittance measurements and calibration (both 0% calibration and 100% calibration) for transmittance
measurements be performed under these conditions.
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{The EEPROM of the Spectrophotometer has space for one set of calibration data for transmittance
measurements.
100% calibration data
Because it is necessary to set the 100% transmittance data to the CM-3700A for all wavelengths, 100%
calibration data are normally set to all wavelengths at shipment.
Calibration of Reflectance and transmittance measurements

18
Performing calibration
Calibration (both zero calibration and white calibration or both 0% calibration and 100% calibration) is effective only
while the Spectrophotometer remains switched on. If it is switched off and then switched on again, both zero calibration
and white calibration (or both 0% calibration and 100% calibration) must be performed before measurements are taken.
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cThe calibration becomes effective only when being performed under six kinds of measurement
conditions. Therefore, for example, when performing the measurement of SCI and SCE alternately,
performing the measurement by switching the measurement area in a sequential order, or by switching
the UV light quantity, if you perform zero calibration and white calibration (0% calibration and 100% of
calibration) in advance as to up to six kinds of necessary measurement conditions, you do not have to
perform calibration every time the measurement conditions are changed. However, to more accurately
perform measurement, it is recommended to perform zero calibration and white calibration (0%
calibration and 100% calibration) every time measurement conditions are changed.
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cWhen the calibration has been performed under the seventh kind of measurement conditions, the oldest
calibration becomes ineffective and the calibration performed under the seventh kind of measurement
conditions becomes effective as the latest. Moreover, when the calibration is re-performed under
the same measurement conditions as one calibration that was already performed, not that the oldest
calibration becomes ineffective, but the calibration already performed under the same measurement
conditions becomes ineffective and the re-performed calibration becomes effective as the latest.
Example) First, zero calibration and white calibration are performed under the following six kinds of
measurement conditions in numerical order.
①Measurement area : SAV / Specular component : SCI / Target mask : SAV / UV light quantity 99.9
②Measurement area : MAV / Specular component : SCI / Target mask : MAV / UV light quantity 99.9
③Measurement area : LAV / Specular component : SCI / Target mask : LAV / UV light quantity 99.9
④Measurement area : SAV / Specular component : SCE / Target mask : SAV / UV light quantity 99.9
⑤Measurement area : MAV / Specular component : SCE / Target mask : MAV / UV light quantity 99.9
⑥Measurement area : LAV / Specular component : SCE / Target mask : LAV / UV light quantity 99.9
In this case, the calibration can be performed under all the six kinds of measurement conditions. Moreover, the
calibration can be performed when UV light quantity is set except 99.9. However, in this case, the measured
value is calculated and output based on the nearest UV light quantity (in this example 99.9).
Next, if the calibration under the conditions
⑦Measurement area : SAV / Specular component : SCE / Target mask : SAV / UV light quantity 99.9
is re-performed, not that the oldest calibration under the conditions ①becomes ineffective, but the
calibration under the conditions ④, which was performed under the same measurement conditions,
becomes ineffective and the calibration under the conditions ⑦ becomes effective as the latest.
Next, if the calibration under the seventh kind of conditions
⑧Measurement area : MAV / Specular component : SCI / Target mask : MAV / UV light quantity 90.0
is performed, the oldest calibration under the conditions ①becomes ineffective and the calibration under
the conditions ⑧becomes effective as the latest. As a result, effective calibrations can be arranged in the
following chronological order.
②Measurement area : MAV / Specular component : SCI / Target mask : MAV / UV light quantity 99.9
③Measurement area : LAV / Specular component : SCI / Target mask : LAV / UV light quantity 99.9
⑤Measurement area : MAV / Specular component : SCE / Target mask : MAV / UV light quantity 99.9
⑥Measurement area : LAV / Specular component : SCE / Target mask : LAV / UV light quantity 99.9
⑦Measurement area : SAV / Specular component : SCE / Target mask : SAV / UV light quantity 99.9
⑧Measurement area : MAV / Specular component : SCI / Target mask : MAV / UV light quantity 90.0
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{The measured values are affected by UV light quantity to some extent. If you want to perform rigorous
measurement, after changing the UV light quantity, zero calibration and white calibration (0% calibration
and 100% calibration) should be performed. When performing the fluorescent measurement that does
not require rigorous measured values, the measurement should be performed with the UV light quantity
of 99.9.
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{Due to temperature changes in the surrounding environment and heat generation caused by repeated
applications, the indicated values may subtly deviate, but if the calibration is regularly performed, the
measurement accuracy will improve.