Minolta Luminance Meter
LUMINANCE METER
LS-100
- LS-110
INSTRUCTION MANUAL
“0
Minolta Luminance Meters LS-100 and LS-110 are lightweight, compact meters for taking
luminance measurements of light sources or reflective surfaces. Using advanced optics and elec-
tronics, these meters are extremely accurate, completely portable, and easy to operate.
The LS-100 has a 1° acceptance angle; the LS-110 has a 1/3° acceptance angle. Both have a
TTL (through-the-lens) viewing system which accurately indicates the area to be measured, and an
in-viewfinder display to allow measurements to be seen along with the measurement subject. The
optical system reduces flare, so that measurements are virtually unaffected by light sources outside
the indicated measurement area. The silicon photocell measures light received by the lens, and is
filtered to closely match the CIE Relative Photopic Luminosity Response. The signal from the
sensor is processed by the built-in microcomputer, and measured values are displayed in 4 digits in
both the external display and the viewfinder display.
The meters can measure over a wide range of luminance levels (LS-100: 0.001 to 299900
cd/m*; LS-110: 0.01 to 999900cd/m?). Absolute luminance can be measured in both cd/m? and
fL; percent luminance can also be measured to compare the luminances of two subjects. Either of
two calibration standards can be used for measurements: PRESET for measurements based on
Minolta's calibration standard; VARI. for measurements based on a user-selected standard. The
peak measurement taken while the trigger was held in can be displayed, and a color-correction
factor can be used to automatically adjust the response of the meter when measuring colored
subjects or using close-up lenses to measure small subjects. In addition, the LS-100 and LS-110
have digital data-output terminals for sending data to the Data Printer DP-10 or a separate computer.
Please read and study this manual before using the Minolta Luminance Meter LS-100 or LS-110
for the first time, and keep it for future reference. |
STATEMENT OF FCC COMPLIANCE
This device complies with Part 15 of FCC Rules. Operation is subject to the following two condi-
tions: (1)This device may not cause harmful interference, and (2)this device must accept any inter-
ference received, including interference that may cause undesired operation. Change or modifications
not approved by the party responsible for compliance could void the user's authority to operate the
equipment This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable pro-
tection against harmful interference in a residential installation. This equipment generates, uses and
can radiate radio frequency energy and, if not installed and use in accordance with the instructions,
may cause harmful interference to radio communication. However, there is no guarantee that inter-
ference will not occur in a particular installation. If this equipment does not cause harmful interference
to radio or television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected. Consult the dealer or an experienced radio/TV technician for help.
CONTENTS
Page
DESCRIPTION © © .... 1111111111 LL LL LL 4 A A A LA 4 A4 La ee 4e ee ee LL Le 1
CONTENTS KK 2
NAMES OF PARTS. tt ee ee ee ee ee ee ee 4 4 ee 4e 4e ea Se ee L Le 3
FUNCTIONS OF KEYS AND SWITCHES... 120444444444 4 41 2e 46 aaa 4
DISPLAYS AND INDICATIONS © oe ee ee ee ee ee eee Le 6
OPERATION FLOW CHART eK KG 10
PREPARATION RR KK KHK KHK 11
Installing battery... ....0000000000400 00H KERNE 11
Selecting luminance Unit. . ............00rerrerecrrererrrerrrererecrrere. 11
Eyepiece adjustment . oo... oo oti eee SA ee ee 12
NOTES ON USING THE LS-100/L$-110. 2000000000000 RK KH 13
CALIBRATION ee ee ee ee ee ee ee ee eee 14
PRESET calibration. © © ov vee ee ee ee ee ee ee ee ee ee ee eee eee HH 0 14
VAR Calibration . oo ot eo ee ee ee ee ee ee ee eee ee ee ae ee a 14
Standardizing meters « «oo cv ve ie ee ee eee eee eee eee 18
ABSOLUTE MEASUREMENTS. ........ ee 40 8 404 A4 48 4e A eee 19
PERCENT LUMINANCE MEASUREMENTS. ...... ereereroererecrerrerrere, 20
Input of reference luminance. .......o_oeeereenecerevrerecretrerrecerererare 20
Reference luminance data recall.... 1.220402 4 444 ea ee eee te eee et te tte eee 24
Taking measurements. .. .. . . aaa aaa eaodu0noaaronnecve vee. 24
PEAK MEASUREMENTS. © «ti ttt te ee ee tte eee ee бек 26
COLOR-CORRECTION FACTOR ... 111204204444 44444 6 4 08 ee 4 4 Se 3e eee» 27
Setting color-correction factor. ..... 210404444444 ee es eee ee ee ee re ee et eee 27
Color-correction factor recall..... 11200444 444 614 4 484 ee avere. 29
Approximate color-correction factors of common light sources - . .. reee 30
Measurements using the color-correction factor. .. .... 2.008444 48534044 4 et ee eee 31
USING CLOSE-UP LENSES .... 1.201114 4 4444244 44444 4e Se 884 4 84e eee eee 32
MEMORY... 111110111111 LL LA LL 44 A4 44 4e 4 4 4 4 44 84e 4e 1e 4 4 41e 84 8e ee 33
Memory error... coe eo ee eee et ee te me ee eee ee sees 33
Clearing memory. aaa ana rnenae reed recodo ae nar crerr ere creer 33
LOCKING THE FOCUSING RING. ©... ee ere ee 34
DATA-OUTPUT TERMINAL ....... ee eee ees eee ees ens 35
Using an external power supply . «o.oo coi ieee 35
Use with a separate COMPUTEr . . LL. oo tt ie eee esas eee ee 36
MEASURING SYSTEM ................. DE aaa 39
Optical system © oo vt te ee ee ee ee eee eae eee eee о 39
Electronic system © oo vt tie ee ee te eee eee eee ees eee 40
Influence of flare. © oo oie et ee ee te ee ee ee eee eee eae eee 40
MINOLTA STANDARD CALIBRATION PROCEDURE ......202 004154001008 40800085 41
CARE AND STORAGE .. ....12 2042142 424 24 4444 44 488 8 4 4 eee 42
SPECIFICATIONS .. KH нНн НН! 43
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NAMES OF PARTS
D
© Luminance-unit selector switch
@ Distance scale
© Data-controi key
@ PEAK/CONT. key
© Increase key
O key
O CALIBRATION selector switch
O Measuring trigger
O Power switch
(P Data-output terminal
@ Tripod socket
@ Handgrip
® Wrist strap
® Focal-plane indication
® RESPONSE speed selector switch
J MEASURING MODE selector switch
@ Eyepiece
(D External display
Hib,
)
FUNCTION OF KEYS AND SWITCHES
Luminance-unit selector switch
_Selects either cd/m? or fL luminance units
Data-control key {will be shown as throughout this manual.)
__Recalls user's calibration data from memory when MEASURING MODE selector switch is at
ABS., CALIBRATION selector switch is at VARI., and data-control mode is set to “LUMI.”
—Recalls reference luminance data from memory when MEASURING MODE selector switch is
at % and CALIBRATION selector switch is at PRESET or VARI.
Recalls color-correction factor from memory when MEASURING MODE selector switch is at
ABS. CALIBRATION selector switch is at VARI., and data-control mode is set to “C.C.F.”
_Selects data-control mode when pressed while[ F_|held in.
Mode changes in the following order:
LUMI>C.C.F.>C.C.F./LUMI.>LUMI....
—Moves cursor to select data to be changed when setting user's calibration data, reference
luminance data, or C.C.F. value.
Data to be changed selected in the following order:
Recalled data>multiplier/decimal point—>first digit (from left) >secand digit>
third digit>fourth digit>recalled data>…
PEAK/CONT key (will be shown as[ P/C throughout this manual.)
—Changes data-display mode from CONT to PEAK or from PEAK to CONT when pressed
while[ F_]held in.
[ t JIncrease key
“Increases the value of the digit above the cursor by one each time key Is pressed while[ F_]
held in; number increases continuously if key is held down. Number can be set between O
and 9: if key pressed after 9 is reached, number returns to Ô and cycle starts over.
key
— Releases the built-in safety lock which prevents data from being changed accidently. Must be
held down while pressing [RCLAJ, [p/C], and[ 1 to perform their designated functions.
_Stores user's calibration data in memory when held down while sliding CALIBRATION
selector switch from VARI to PRESET and back to VARI.
—Stores reference luminance data for percent measurements when held down while sliding
MEASURING MODE selector switch from ABS. to % (if reference data measured) or from %
to ABS. to % (if reference data set using and [1 1).
—Stores color-correction factor in memory when held down while sliding CALIBRATION
selector switch from VARI to PRESET and back to VARI with data-control mode set 10
“C.C.F.”
CALIBRATION selector switch
_Selects the calibration standard: PRESET for Minolta standard, VARI. for user-selected
calibration standard or for using color-correction factor.
—Stores user-selected calibration data in memory when slid from VARI. to PRESET and back
to VARI. while[ F_]held down.
_Stores color-correction factor in memory when slid from VARI. to PRESET and back to
VARI. while held down with data-control mode set to “C.C.F.”
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MEASUREMENT MODE selector switch
—Selects measurement mode: ABS. for absolute luminance measurements, % for percent
luminance measurements
—Stores reference luminance in memory when slid from ABS. to % (if reference luminance is
down .
measured) or from % to ABS. and back to % (if reference luminance is set) while [_F_|held
RESPONSE speed selector switch
—Selects meter's response speed.
—Set to FAST when metering under normal lighting conditions, including natural light, tung-
sten lighting, and fluorescent lighting.
sources.
Power switch
—Set to SLOW when metering flickering light sources, including television screens, video
monitors and projectors, movie projectors, flashing LED lighting, and non-continuous light
—Switches meter power ON and OFF.
Measuring trigger
In.
— Takes measurement when pulled in; measurements are continuously made while trigger is held
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DISPLAYS AND INDICATIONS
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External display Viewfinder display
NOTE:
e The external display will be blank except for metering-mode in
formation (“C.C.F.”, “LUMI.”,
“PEAK”, “%", and "cd/m?” or “fL”) when the power switch is first slid to ON or when
the measuring trigger is released before measurement has been completed.
e The viewfinder display will be off when the power switch is first slid to ON. !t will remain off
until the measuring trigger is pulled and is automatically turned off again about 5 seconds after
measuring trigger is released.
Absolute luminance
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NOTE:
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meter). Sample displays will use cd/m? throughout this manual.
Peak absolute luminance
and cd/m? (candles per square
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Luminance based on color-correction factor
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Percent luminance
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Peak percent luminance
PEAK %
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Data recall
VARI. calibration
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Reference luminance
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Color-correction factor
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Battery power low
Battery power is almost exhausted. Replace battery.
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Calculations in progress
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PE
Appears for a short time when:
Measurements are converted between continuous and peak measurements;
Measurements are recalculated after changing data-control mode; or
When user-calibration data, reference luminance data, or color-correction factor is stored
in memory.
Clear-memory-confirmation prompt
(See p. 33 for details.)
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Error
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Appears for a short time if:
Recalculation is attempted before measurement is taken.
An attempt is made to store 0 or EQ as user-calibration data, reference luminance data, or
color-correction factor. Previous data will remain in memory.
User calibration is attempted without measurement. Previous data will remain in memory.
Over measuring range
range.
2 (87,540 fL) at FAST response speed, over
49,990 cd/m? (14,590 fL) at SLOW response speed
Appears when luminance exceeds measuring
LS-100: luminance over 299.900 cd/m
LS-110: luminance over 999,900 cd/m? (291,800 fL) at FAST response speed, over
499,900 cd/m? (145,900 fL) at SLOW response speed
Memory error
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Stored user-calibration data, reference luminance data, or color-correction factor has been
lost from memory. The memory must be cleared before proceeding (see p. 33).
Unit malfunction
- |
The meter is malfunctioning and needs to be repaired. Contact the nearest Minolta Authorized
Service Center.
Over display range
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%
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would result in an absolute luminance value of over 999900 (cd/m? or
Present measurement
Check reference luminance value and take
fL) or a percent luminance value of over 999. 9%.
another measurement.
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No reference luminance data in memory
%
%
rt
Reference luminance data was not previously stored in memory. Measure or set data of re-
ference luminance before proceeding.
Appears while keys are held down when changing data-control or PEAK/CONT. mode.
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OPERATION FLOW CHART
Preparation
Insert battery.
Eyepiece adjustment
Set luminance unit.
|
Calibration Minolta standard (PRESET) User standard (VARI)
Absolute measurements
Percent luminance
measurements
Measurement
Take measurements.
Input reference luminance
10
Take measurements.
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PREPARATION
Installing battery
The meter is powered by a single 9V battery (Eveready 216 or
equivalent).
1. Check that the power switch is at OFF.
2. Remove the battery-chamber cover by pressing down on it and
pushing in the direction of the arrow on the cover.
3. Position the battery terminals as shown inside the battery
chamber, then insert the battery, terminal end first.
4, Replace the cover by realigning it and pushing towards the
meter body until the cover snaps securely in place.
5. Slide the power switch to ON. If metering-mode information
appears in the external display, the battery is OK, If БО’ ог
no display appears, battery power is exhausted. Replace with a
new battery.
The meter may also be used with an external supply connected to
the data-output terminal. See page 35 for required connections.
Selecting luminance unit
The meter can be used to measure luminance in cd/m? or fL.
Select the desired measuring unit by following the steps below.
1. Remove the battery-chamber cover by pressing down on it and
pushing in the direction of the arrow on the cover.
11
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2. Adjust the luminance-unit selector switch to the desired setting.
3. Replace the cover by realigning it and pushing towards the
meter body until the cover snaps securely in place.
Measurements can be converted from one luminance unit to the
other by sliding the luminance-unit selector switch to the desired
position after measurement. The meter will automatically recalcul-
ate the last measurement and will also recalculate the user-calibra-
tion and reference luminance data in memory.
Eyepiece adjustment
Turn the eyepiece frame until the 1° (1/3° for LS-110) measure-
ment-area indication is sharp in the viewfinder (adjustable diopter
range: +2.5 to -3.75).
12
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NOTES ON USING THE LS-100/LS-110
e When taking measurements, be sure that the subject fills the measurement area. If subject does
not fill the measurement area, move closer or use a close-up lens and refocus. Measure-
ments of subjects smaller than the measurement area will not be accurate.
Metering-mode information (“C.C.F.”, “LUMI.”, “PEAK”, “%”, and “cd/m** or “fL’*) will
appear and measured values will not be displayed if the measuring trigger is released before
measurement has been completed.
New measurements will be taken and the readings displayed every 0.8 to 1 second at FAST
response speed {every 1.4 to 1.6 seconds at SLOW response speed) if the measuring trigger is
held in.
While a measurement is shown in the LCD panel, it can be converted to a measurement in
another mode by doing any of the following:
—To convert to a peak measurement, press and hold[ F | and press[ P/C |. “PEAK” will appear
in the display. See page 26.
—To convert from an absolute luminance measurement to a percent luminance measurement (if
a reference luminance has been previously stored in memory), slide the MEASURING
MODE selector switch to %. See page 20. :
—To convert from a percent luminance measurement to an absolute luminance measurement,
slide the MEASURING MODE selector switch to ABS. See page 19.
—To convert to a measurement based on the other calibration value, slide the CALIBRATION
selector switch to the other position. See page 14.
—To convert to a measurement calculated to include the C.C.F., set CALIBRATION selector
switch to VARI., press and hold [ F |, and press until “C.C.FE.” (“C.C.F.” and
“LUMI if using VARI. calibration) appears in the display. See page 27.
—To convert to a measurement in the other luminance unit, slide the luminance-unit selector
switch to the other position. See page 11.
When the position of the luminance-unit selector switch is changed, the meter will automatical-
ly recalculate the last measurement and will also recalculate the user-calibration and refer-
ence luminance data in memory.
User's calibration data, reference luminance data, and color-correction factor are retained in
memory until changed or cleared by the user. Data remains in memory even when the power
is switched OFF, the battery is replaced, or the power cord is disconnected during use
with an external power source.
The viewfinder display will automatically turn off approximately 5 seconds after the trigger is
released.
If the meter is mounted on a tripod for extended metering and there is a bright light source
near the viewfinder, meter readings may be affected by this light source. Cover the eyepiece
with the included eyepiece cap whenever measurements will be taken while not looking
through the viewfinder.
The viewfinder display may be difficult to read when measuring extremely bright subjects. In
such cases, insert the provided neutral-density (ND) filter into the eyepiece.
If the LS-100/LS-110 is being used to measure a CRT, do not place the meter closer than 8
inches (20cm) from the CRT ( as measured from the focal-plane indication).
13
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CALIBRATION
PRESET calibration
The PRESET position of the CALIBRATION selector switch can be used when measuring most
subjects. This position automatically calibrates the meter to the Minolta standard (see page 41
for details). It is not necessary for the user to calibrate the meter when the CALIBRATION selec-
tor switch is at PRESET.
VARI. calibration
The VARI. position allows the user to calibrate the meter to any subject desired. It can be used
to calibrate the meter to another standard subject for which the luminance is known, to precisely
standardize meters to the same subject, or when using a color-correction factor (see page 27). To
use the VARI. position of the CALIBRATION selector switch, follow the steps below.
MEASURING USER-SELECTED STANDARD SUBJECT
1. Slide the POWER switch to ON.
2. Set the CALIBRATION selector switch to PRESET and the
MEASURING MODE selector switch to ABS. Check that RE-
SPONSE speed and luminance-unit selector switches are in the
desired position. |
3. Aim the meter at standard subject and turn focusing ring until
the subject appears sharp.
4. Pull the measuring trigger and hold it in until the luminance
value appears in the viewfinder display (approximately 2 sec-
onds at FAST response speed or 4 seconds at SLOW response
speed). The luminance value will also appear in the external
display, as shown at right.
14
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SETTING CALIBRATION DATA
Set VARI. calibration data of LS-100/LS-110 to the standard calibration data for the subject
measured in step 4 according to the following steps.
5. Slide CALIBRATION selector switch from PRESET to VARI.
1£ “C.C.F.” appears in the display, meter is set for measure-
ments with a color-correction factor. Press and hold and
press until only “LUMI appears in the display.
6. Press CLA). Previously set calibration data will appear in the
external display, as shown at right. If no calibration data was
previously set, the displayed value will be 0.000 (00.00” for
LS-110).
7. Press [RCLA| again. Cursors will appear only under the multiplier
Ds positions, as shown at right.
8. Set decimal-point position or multiplier if necessary by pressing
and holding and pressing] t |. Decimal-point position
and multiplier will change as shown below each time is
pressed while held down.
(LS-100 only) Numerical value
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LUML LI. LI LÉ LI N cd/m LUML LI 7 uy cd/m
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Decimal point
Numerical value x 100 | Y
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mL LU UU UU dm mL LE LLL cd/m
Numerical value x 10 Y
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— Multiplier
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9. Press ÍRCLA] again. The cursor will move to the first digit C я
(from left) of the numerical value, as shown at right.
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10. Set calibration data of first digit by pressing and holding it 7
and pressing .
The value of digit can be set between 0 and 9. The value is in- IE EE
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creased by one each time is pressed while held anon u
down: increases continuously if both keys held down. When = el.
the value reaches 9, it will return to 0 if[ 1] pressed while erst [LJ cow
held down. SW
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11. Press [RCLA| again. The cursor will move one digit to the right. Ww )
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CALIBRATION MEASURING MODE
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12. Set calibration data of digit by pressing and holding[_F |and UC 5
pressing [ 1 |].
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13. Repeat steps 11 and 12 to set third digit, and again to set
fourth digit of calibration data.
16
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STORING CALIBRATION DATA
14. To store the calibration data in memory, press and hold! F |
and slide the CALIBRATION selector switch from VARI. to
PRESET and back to VARI. The external display will show
“CAL for a moment as the calibration data is stored, and
then it will change to a measurement display showing the
stored calibration data.
VARI. CALIBRATION DATA RECALL
To check user's calibration in memory:
1. Slide the POWER switch to ON.
2. Set the CALIBRATION selector switch to VARI. and the
MEASURING MODE selector switch to ABS.
If “C.C.F.” appears in the display, meter is set for measure-
ments with a color-correction factor. Press and hold and
press until only “LUMI” appears in the display.
3. Press [RCLA]. The previously stored user's calibration data will
appear in the external display, as shown at right. Cursors will
appear under all four digits of the numerical value.
Recall display can be canceled by pressing measuring trigger or
any of the operation keys, by changing the position of MEASUR-
ING MODE or CALIBRATION selector switch, or by sliding the
POWER switch to OFF.
17
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Standardizing meters
To standardize several meters, calibrate all meters to the same subject. Measure the subject
with all meters, and set them to the standard calibration data for that subject following the pro-
cedures in the preceding VARI. calibration section.
18
ABSOLUTE MEASUREMENTS
Minolta Luminance Meter LS-100/LS-110 can be used to measure the luminance of a wide
variety of light sources and reflective surfaces by following the steps below.
1. Slide power switch to ON.
2. Set the MEASURING MODE selector switch to ABS. and check
that CALIBRATION, RESPONSE speed, and luminance-unit
selector switches are set to the desired positions.
If “PEAK” appears in the display, meter is set to peak mode.
To set meter to continuous mode, press and hold and
press[ P/C |; "PEAK" will be removed from the display.
If “C.C.F.” appears in the display, meter is set for measure-
ments with a color-correction factor. Press and hold[ F land
press until only “LUMI” appears in the display.
3. Aim the LS-100/LS-110 at the subject and turn the focusing
ring until the subject appears sharp.
4. Pull the measuring trigger and hold it in until the luminance
value appears in the viewfinder display (approximately 2 sec-
onds at FAST response speed or 4 seconds at SLOW response
speed). The luminance value will also be shown in the external
display.
THT
HH
Tun "au НТ
HLTH
AAA
IEE IGT eT ? MO !
CI ac:
RECALLS wm
CALBAATION MEASURING ODE
22533 (Ш) ен SC) +
RESPONSE
= rast (IJ sow
— “
“hey
«pie
am
PERCENT LUMINANCE MEASUREMENTS
The LS-100/LS-110 can also be used to take percent luminance measurements for comparing
the brightness of two light sources. Before taking percent luminance measurements, a reference
luminance must first be stored in memory.
input of reference luminance
1. Slide power switch to ON.
2. Check that CALIBRATION, RESPONSE speed, and luminance-
unit selector switches are set to the desired positions.
[f “PEAK’ appears in the display, meter is set to peak mode. To
set meter to continuous mode, press and hold[ F_]and press
[P/C]; “PEAK” will be removed from the display.
If “C.C.F.” appears in the display, meter is set for measure-
ments with a color-correction factor. Press and hold[ F |and
press until only "LUMI" appears in the display.
The reference luminance may be measured or set directly. If a
suitable reference subject is available, start with step 3 below. If
the reference luminance is known and no suitable subject is avail-
able, set MEASURING MODE selector switch to % and start with
step 7 below.
20 -
HI
[|
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TAN Ц
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tU J)
[\CCfaum Pemcconr + € |
LJ CI C3 CO
ALL a.
CALIGRATKON MEASURING MODE
zu 0) u (ET) +
RESPONSE
— x
MEASURING REFERENCE SUBJECT
3. Set the MEASURING MODE selector switch to ABS.
4. Aim the L.S-100/LS-110 at the subject and turn the focusing
ring until the subject appears sharp.
6
Pull the measuring trigger and hold it in until the luminance
value appears in the viewfinder display (approximately 2 seconds
at FAST response speed or 4 seconds at SLOW response speed).
The luminance value will also be shown in the external display.
. Press and hold and slide the MEASURING MODE selector
switch to %. The display will read “CAL” for a moment while the
luminance value is stored in memory, and then will read “100%”
to show that the value has been correctly memorized.
The LS-100/LS-110 is now ready to take percent luminance
measurements based on the measured reference subject. Îf it is
necessary to adjust these values, continue with step 7 below.
21
IL J}
| CCFMIM -PEAKCONT. | + Er El
(O9 C3 O cd
RECALLS ui
MEASURING ODE
CELIBSATION
MI) vr UT) *
Ne
>>; =
as
— my,
va
Loire
A
==
|= -
%
PU
—
ча
=
pr ==
A
Naben rat am
658
SETTING REFERENCE LUMINANCE DATA
7. Press . Previously set reference luminance data will
appear in the external display, as shown at right. If no reference
luminance data was previously set, the displayed value will be
“0.0007 (00.00 for LS-110).
8. Press |RCLA] again. Cursors will appear only under the multiplier
positions, as shown at right.
9. Set decimal-point position or multiplier if necessary by pressing
J and holding [ F | and pressing] t |. Decimal-point position
So and multiplier will change as shown below each time 15
pressed while held down.
(LS-100 only) | Numerical value
man ; anna ,
ны cd/m Lf y LU саит
Г
Decimal point
=
—
pre me,
=—
Numerical value x 100 Y
Titan ., поло 2
LI LU LIL U Li cdim Le LO EN. LO cd/m
Numerica! value x 10 Y
п пила : . nana ;
НН НЫ cdim guuu cd/m
"kam wally, whe al
1
Multiplier
10. Press [RCLAJ again. The cursor will move to the first digit
(from left) of the numerical value, as shown at right.
22
——
—
[COF0UMI PERKICONT. e NE
a) 9 CD Y]
CALIGRATION MÉASUEUNG MODE
UN]. CD +
RESPONSE
=
*
IL J)
LLSCHAUM PEAKICONT + RCE
OO) CO
PRECREL + =
CALIBAATION MEASURING MODE
[we 30 =
RESPONSE
SONDE
=>
—— _—
:
=
=
« J
| NC TAN MA N
СЭ ©
RECALL; w=
CALIBRATION MEASURING MODE
232 (Г) we
{L —
ee ICH И
CI CI Cc
RE Ls ai
CALIGAATICN MEASURING LODE
EE {iw CES) +
RESPONSE
A
Eu
eu
Co
=-
i
Li cd/m
)
Saggy”
11.
12.
13.
14.
15.
Set reference luminance data of first digit by pressing and
holding [ F_ and pressing
The value of digit can be set between O and SG. The value is
increased by one each time is pressed while [_F_ | held
down: increases continuously if both keys held down. When
the value reaches 9, it will return to 0 if [1 | pressed while
held down.
Press RCLA] again. The cursor will move one digit to the right.
Set reference luminance data of digit by pressing and holding
[F land pressing [_! |}.
Repeat steps 12 and 13 to set third digit, and again to set
fourth digit of reference luminance data.
To store this data in memory, press and hold [Е |, slide
MEASURING MODE selector switch from % to ABS. and then
back to %. The display will read “CAL" for a moment while
the reference luminance data is stored in memory, and then
will revert to the measurement display.
The LS-100/LS-110 is now ready to take percent luminance
measurements based on the reference luminance data in memory.
23
\ —)
rase cal
LS (I
Es
J
RÉCALL: ==
CALIBRATION VEA SI RADO
VAR
`
U y
CCS TTC + FE | a
AT CC Co C3
CALIERATION ALAS EG MODE
| PRESET IM ) vars Es (CT »
AE SA
! 1
Li cd/m
==,
—
}
| — is
| rere
| CCFAUM! PEAKICONT_ ¢ | ETT Ne LA + НС в
RECALL 7 v=
CALHAATION AEA SENS WOE
esca [Mw SON"
E
\ À
MCE ZN NC |
CU) (C3
RECALL / wa
CALIBRATION
MES EG
=A [ws 9 0) *
—
} —
ura
\ _J)
| CCFAUMI PEAKICONT + GE E
RECALL/ um
CALISRATICN ALAS RNG
Ca UN) e sl +
>
к
™ =
a
Ln!
Ame
a
уч
LT
cd/m |
Reference luminance data recall
To check the reference luminance data in memory:
1. Slide power switch to ON.
2. Set MEASURING MODE selector switch to % and CALIBRA-
TION selector switch to the position which was set when
reference luminance data was stored.
3. Press [RCLA] The previously set reference luminance data wiil
appear in the external display, as shown at right. Cursors will
appear under all four digits of the numerical value.
Recall display can be canceled by pressing measuring trigger or any
of the operation keys, by changing the position of MEASURING
MODE or CALIBRATION selector switch, or by sliding the POWER
switch to OFF.
Taking measurements
1. Slide power switch to ON.
2. Set the MEASURING MODE selector switch to % and check
that CALIBRATION, RESPONSE speed, and luminance-unit
selector switches are set to the desired positions.’
If “PEAK” appears in the display, meter is set to peak mode.
To set meter to continuous mode, press and hold and
press [ P/C]; “PEAK” will be removed from the display.
24
QG
OT
|
HHH
Li
HHH
HHH EH
U JJ
e
CI CC СЭЗ СЭ
RECALLS wm
CALIBRATION MAE ASDSENG MODE
EE (UN) e 300 *
RESPONSE
east (I) son
UNIS
Ц JJ
nu «
C3 CJ) СЭ
EC 2 эт
CALIBRATICN MEASURING MODE
3 (1) ver Cam *
RESPONSE
Na FAST Tm) SLOW
SDS —————
cdim
›
PLT
pro
y.
ET EE
Г LIT
HHH
HHH
HHH
U J
SC VÍ
DI cy CU 3
RECALL?7 m
CALIBRATION MEASLFTNG MODE
Gl [MD vw CSIC) *
RESPONSE
FOND ol MT) Row
Г _———————————
A
A
de
©
Ma —
E u
3. Aim the LS-100/LS-110 at the subject and turn the focusing
ring until the subject appears sharp.
4. Pull the measuring trigger and hold it in until the percent
luminance value appears in the viewfinder display {approximate-
lv 2 seconds at FAST response speed or 4 seconds at SLOW
response speed). The percent luminance value will also be shown
in the external display.
25
%
Di
ci
Le
PEAK MEASUREMENTS
The LS-100/LS-110 can be set to display the peak measurement taken during the time that
the measuring trigger was held in. To set the meter to peak mode:
1. Slide power switch to ON.
LIT
f+] E HT
CA
Г НН 4
2. Press and hold and press[ P/C ]to set meter to peak mode; Ч р
the display at right will appear.
CD TEE A MC |
+
RECALLS m $
CALIBRAT MEASURING
ERM) ws EST) <
When both keys are released, the display will show “CAL”
for a few seconds and then will revert to the measurement
display.
==
—
|
——————]j Fs
ta
>
1 A
|
1
td
с
4
(I
=
Lai
| LUMI. É cd/m |
Peak measurements may now be taken in ABS. or % measuring
modes, in PRESET or VARI. calibration, and with or without a
color-correction factor by following the measuring procedure given
in the appropriate section of this manual.
26
reo al
cedo
COLOR-CORRECTION FACTOR
f .
{
A color-correction factor can be used by the LS-100/LS-110 to adjust the spectral response of
the meter to more accurately measure subjects with colors greatly different than the calibration
standard, or when using close-up lenses (page 32). Color-correction factors are normaliy deter-
mined based on measurements using a spectrophotometer. A list of approximate color-correction
factors for some common light sources is given on page 30. The meter can store a color-correction
factor in memory, and can then calculate measurements based on that factor.
Setting color-correction factor
The color-correction factor can be set between 0.001 and 9.999. To set the color-correction
factor, follow the steps below.
1. Slide power switch to ON.
2 Set CALIBRATION selector switch to VARI. and MEASUR-
ING MODE to ABS.
3. Press and hold and press repeatedly until the dis-
play at right appears.
When both keys are released, the display will show “CAL” for
a few seconds, and then change to the lower display at right.
27
U —
CAT TS + mu 1
RECALLS um
CALIBRATION MEASURING MODE
EE (О ее ESI] «
RESPONSE
a. FAST MN } SLOW
|
IL 1
. |
E: me "
+ pa
CALIBRATION MEASURING
SD + CS) >
RESPONSE
=
— LY
VRT
AT
4. Press RCLA]. The previously set color-correction factor will
appear in the display. [f no color-correction factor was pre-
viously set, the display will show “1.000”
НЕСЯ -
CALIBRATION ME ASURING MODE
ces (Ts 293 0)
RÉSPONSÉ
==
—L LY
©
>
тп
bem
y=
pou
bE
5. Press RCLAl again. The cursor will appear under only the first u 1
digit (from left) of the color-correction factor, as shown at
right. , n
REC --—
CALIBRATION WEASURING MODE
62254 (ПО) 7 SSI) +
RESPONSE
FOND FAST (ОТ | stow
— wr
«=
Г
ei
a
CCF i il
ILL
6. Set value of first digit of color-correction factor by pressing U —
and holding [ F_Jand pressing[_t |.
The value of digit can be set between 0 and 9. The value 1s o Go
increased by one each time is pressed while held sanos „беты
down: increases continuously if both keys held down. When GES НЫ О *
the value reaches 9, it will return to 0 if [1 Jpressed while rast (ID) som
— “
[ F J]held down. —- ——
7. Press again. The cursor will move one digit to the right. N y
8. Set value of digit by pressing and holding and pressing IL A
| ane MC
LJ CI
28
9. Repeat steps 7 and 8 to set third digit, and again to set fourth
digit of color-correction factor.
10. To store the color-correction factor in memory, press and hold
and slide the CALIBRATION selector switch from
VARI. to PRESET and back to VARI. The display will read
“CAL” for a moment as the value is stored in memory, and
then will revert to a measurement display.
РОО - The LS-100/LS-110 is now ready to take measurements using the
EA color-correction factor.
Color-correction factor recali
To check the color-correction factor in memory:
1. Slide power switch to ON,
2. Set CALIBRATION selector switch to VARI. and MEASUR-
ING MODE to ABS. ; |
29
i,
ans LIT
HHH
5 FOIE
TH rT
HHH
Wu
ECC NIET y E
C3 C32
CI C3
RECALLS wm
CALIBRATION MEA ENG MODE
GNT ++ ES)»
RESPONSE
SIN east {J scow |
——_ `
Y
/
Pa
+ ;
or i
a 3
В
* \
play at right appears.
When both keys are released, the display will show “CAL” for
a few seconds, and then change to the lower display at right.
4. Press RCLAl. The previously set color-correction factor will
appear in the display. Cursors will appear under all four digits.
Recall display can be canceled by pressing measuring trigger or any
of the operation keys, by changing the position of MEASURING
MODE or CALIBRATION selector switch, or by sliding the
POWER switch to OFF.
Approximate color-correction factors of common light sources
J
CONC), E NC |
C3 C3
REC ,
CALBRATION MEASURE
EER v= — CS 0) «
DL
SEE |
“ «
CCE _ с
rra
1 HL
CCF 2
cd/m
\
| CCFAUMI PEAKICONT EN OG 1
+4 CO) C3 CC
CALIBRATION . LALA SANG MODE
Ea NT VAR | ABS ] ENT ) *
RE SPONSE
VON cast MM] som
CEFR mio ©
LE AU
ILLUMINANT: | COLOR-CORRECTION FACTOR:
CIE Standard Hiuminant В
ClE Standard [fluminant C
CIE Standard illuminant Dg
Daylight fluorescent lamp (F5)
White fluorescent lamp (F6)
Three-band fluorescent lamp™
High-pressure mercury lamp”
High-pressure sodium lamp*
Metal halide lamp (3-additive) *
Metal halide lamp (rare-earth)*
Fluorescent display (Material: ZnO;Zn)*
Color CRT-red*
Color CRT-green*
Color CRT-blue*
Color CRT-white*
CIE Standard !Huminant À + Y-44
CIE Standard llluminant A + 0-54
CIE Standard Illuminant A + R-64
1.007
1.010
1.011
1.013
1.008
1.005
1.007
1.009
1.014
1.009
1.022
0.995
1.018
1.123
1.023
1.000
0.987
0.856
* Color-correction factor calculated based on figure 1 of CIE publication 53: “Detectors””.
30
Measurements using the color-correction factor
Measurements using the color-correction factor can be taken only with the CALIBRATIO!
selector switch set to VARI. Both continuous and peak measurements may be taken by following
the procedure in the appropriate section of this manual.
Although the CALIBRATION selector switch must be set to the VARI. position when using the
color-correction factor, measurements based on either PRESET or VARI. calibration can be taken.
The mode can be changed by pressing and holding | F | and pressing ВСС] . Mode changes in
the following order:
CCF 2. Cer _ _ _ |
TT LUML
À
LL. В
LUML, |
When only ‘’C.C.F.” appears in the display, measurements using the color-correction factor will be
taken based on PRESET calibration.
When both “C.C.F.”” and “LUMI.” appear in the display, measurements using the color-correction
factor will be taken based on VARI. calibration,
When only “LUMI” appears in the display, measurements are taken based on VARI. calibration,
but do not use the color-correction factor.
-
+
=
=
#
31
USING CLOSE-UP LENSES
Optional close-up lenses may be attached to the LS-100/LS-110 for taking measurements of
— small subjects or at short distances. With no close-up lens, the LS-100/LS-110 can measure subjects
as close as 1014mm from the focal-plane indication, with a minimum measuring area of 14.4mm in
diameter. By using one of the optional close-up lenses, measurements may be taken down to
205mm from the focal-plane indication, with a measuring area of only 1.3mm in diameter. Only
one close-up lens at a time may be attached to the LS-100/LS-110. Further details are shown in
the chart below.
AE
h
r
k
CC
LS-100
mm | (a)Measuring diameter at | (b)Measuring diameter at ; (c) Minimum measuring (d) Maximum measuring
minimum measuring maximum measuring distance distance
Close-up lens distance distance
E None A144 — 1014 o
a
No.153 Ф8.0 $ 18.7 623 1210
No.135 $5.2 48.7 447 615
No.t22 $32 $43 323 368
No.110 $15 $1.3 203 205
LS-110
mm | (a)Measuring diameter at | (b)Measuring diameter at | (c) Minimum measuring (d) Maximum measuring
minimum measuring maximum measuring distance distance
Close-up lens distance distance
None $4.3 — 1014 со
No.153 2.1 $6.3 623 1210
No.135 $ 1.8 Ф2.9 447 615
No.122 ФТ Ф1.5 323 368
No.110 Ф 0.5 $0.4 203 205
When taking measurements with close-up lenses, the response of the meter must be adjusted
slightly to compensate for the close-up lens. To do this, set the color-correction factor to 1.050 by
following the procedure in the preceding COLOR-CORRECTION FACTOR section.
A a
32
+
x,
Le
a
7
ВЕ
7
"
MEMORY
User's calibration data, reference luminance data, and color-correction factor are retainec’
memory until changed or cleared by the user. Data remains in memory even when the powe
switched OFF, the battery is replaced, or the power cord is disconnected during use with an ex-
ternal power source.
Memory error
If a memory malfunction occurs and the stored user's calibration data, reference luminance
data, or color-correction factor are lost, “E1” will be indicated in the display as shown.
If this display appears, measurements cannot be taken and the memory must be cleared before
continuing, according to the procedure in the Clearing memory section below.
Mu
Memory error may occur if the power is switched off while “CAL” is displayed when convert-
ing measured values to measurements in another mode or storing the user's calibration data,
reference luminance data, or color-correction factor.
Clearing memory
Follow the procedure below to clear the memory and delete current user's calibration data, ref-
erence luminance data, and color-correction factor. If a memory error has occurred, start with
step 2.
1. Press and hold both and while sliding the power 7
switch from OFF to ON. “CLE” wit! appear in the display.
It it is decided not to clear the memory, either press the mear-
ing trigger or slide the power switch to OFF to cancel the clear
procedure.
=="
-
1
Lo J
Lu
2. While pressing[_F |], slide the CALIBRATION selector switch
— J)
from PRESET to VARI. The display will read CAL‘ for a mo-
. ICE ZTE A BON
ment while the memory is cleared, and then will revert to the СЭ С
measurement display. acto MEASURING
wa Е
| Cm Em) +
All values of user's calibration data and reference luminance data ras MIL) Sow
will be set to 0 and the color-correction factor will be set to 1.000. — > |
Measurements taken at PRESET and VARI. calibration settings — -
will be equal, as will measurements taken with and without the _
color-correction factor. rra
L ML
a
33
#
LOCKING THE FOCUSING RING
The focusing ring can be tocked to prevent the focus from shifting, such as when the LS-100/
LS-110 is set up for taking several measurements without refocusing.
To lock the focusing ring, insert an M3 screw (at least 5mm long) into the focusing ring lock
hole and tighten until snug. Do not overtighten.
С
RECALLS «а.
CALIBRATION MEASURING MODE
EEG MN) ve 9) *
RESPONSE
east [I] stow
$
Focusing-ring lock hole
34
La
DATA-QUTPUT TERMINAL
tion to an external power supply or with a separate computer. The data-output terminal is a Hirose
RP17-13RA-12SD connector. A Hirose RP-17-13P-12PC or other compatible connector should be
used on the data-output cord. The wiring and connections of the output terminal are shown
below.
+ 5V
]
GND
A ;
191588 © | GND
TOKQ 3
+ AAA —O Busy
200k9 151588 а ме.
9 External power supply
5 (+8 to +12V, 100mA)
© Null offset
7
+5V o N.C.
3302 8
NANA © Data out
TLOGICP 9
5v > INC
, 30kQ 10
à AA e Clock out
> 30kQ 11
Ave © Measurement request
+5V 2
300kQ о | +5\у
151588
Using an external power supply
To connect an external power supply to the LS-100/LS-110 via the data-output terminal, con-
nect the positive lead of an 8 to 12V, 100mA power supply to pin 5 of the connector for the data-
output terminal and the ground lead bf the power supply to pins 1 and 2 of the connector. Check
that the power switches of both the LS-100/LS-110 and the power supply are off. Insert the con-
nector into the data-output terminal of the LS-100/LS-110 and switch on the power supply and
the LS-100/LS-110.
35
The LS-100/LS-110 is equipped with a data-output terminal which may be used for cennec- >
Use with a separate computer
The LS-100/LS-110 can be connected to a separate computer via the data-output terminal.
Before connecting the LS-100/L.S-110 to the computer, be sure to switch off the power of both
the meter and the computer.
Data is output in 1-bit serial form at 4800 baud. Each data word consists of 11 bits: 1 start bit,
7 data bits (ASCII code), 1 parity bit (even parity is used), and 2 stop bits. Each measurement data
set consists of 11 data words, as shown below.
Data word! Data output { Meaning
1 “Cc Continuous mode
‘рб Peak mode
2 “с” cd/m?
Hg fi
“%" Percent measurement mode
3 (space) (When in percent measurement mode)
“pr PRESET calibration
“Lr VARI. calibration
“Ek “C.C.F.” displayed; measurements made using color-correction
factor and PRESET calibration
a “C.C.F.” and “LUMI.” displayed; measurements made using
color-correction factor and VARI. calibration
4 CM Measurements will continue to be made and updated
“HY Measurement has ended; data held in display
5% (data) First character from left
6* (data) Second character (digit or decimal point) from left
7* (data)! ‘Third character {digit or decimal point) from left
8” (data) Fourth character (digit or decimal point) from left
9* (data) Fifth character from left
10* (data) Sixth character from left
11 “CR End of measurement data set
* For data words 5 through 10, data is output as shown below:
Data word: 5 6 7 8 9 10
Display Qutput data |
| 2688 or | “2 “8” “ee CB 8” (space)
BED +) “1” CA" “5” “oO (space) (space)
| 68.0.) "7 5 “6” “в” 0” ‘о
Error signals are output as data using the appropriate ASCII code for each display position.
36
наи
If Busy is high, data is output when the trigger is released, when the measurement-request signé
changes from high to low, or as each measurement is completed (every 0.8 to 1.0 second at FAST
response speed or every 1.4 to 1.6 seconds at SLOW response speed) when measurements are taken
continuously and measurement-request signal is held high.
If the trigger is released or the measurement-request signal changes from high to low before data
appears in the displays (less than 2.0seconds at FAST response speed or less than 4.0 seconds at
SLOW response speed}, data will not be output.
The delay to data output after the trigger has been released or the measurement-request signal
changes from high to low is less than 0.2 second at FAST response speed or less than 0.4 second
at SLOW response speed.
When measurements are made with the measurement-request signal the external display comes on
but the viewfinder display does not.
If the voltage of Data out {pin 8) varies when no measurement is being taken (when the measur-
ing trigger is not pulled in and the measurement request signa! is low), connect pin 6 (Null offset)
to pin 12 (+5V). This will cause the voltage of pin 8 to be steady at —5V when no measurement is
being taken.
TIMING DIAGRAMS
H
Busy FAST : Less than 0.2sec.
L SLOW : Less than 0.4sec.
—_—
Measuring trigger
or measurement- OFF (L)
request signal
cic oi NT OT om
L |
ON(H)
Data output
Pins 6 and 12 connected
Busy
GND
208 us
+5V
Clock out
GND .
Le 25. 169ms +
me
+ 7 |
Data output GND || | | |
—5v
> Data > Lin bits
Start bit — Parity bit
Sle sled La
Data word 1 | Data word 2 | | Data word 10 Data word 11{"CR"} |
Pins 6 and 12 connected
37
#
PE
OPERATION WITH BUSY SIGNAL
Busy is checked immediately before data output is attempted; the delay to Busy check (and data
output) after the measuring trigger has been released or the measurement-request signal changes
from high to low is less than 0.2 second at FAST response speed or less than 0.4 second at
SLOW response speed.
Non-continuous measurements
(Data word 4 is “H”
. . ON(H)
Measuring trigger or .
measurement-request
signal OFF {L}
H
Busy
L—
‘а FAST: Less than 0.2sec.
— a
1.1 SLOW: Less than 0.4sec.
ON
Busy check 300msec. Less than 300msec. | |
OFF
—eir—Less than ?msec.
+
H 1
Data output
No data is output
L D
A 8 С
Trigger or measurement-request signal heid high until displays appear.
Pins 6 and 12 connected
No data is output if Busy is low when Busy check is performed. When this occurs, Busy is checked
continuously for 300msec.:
If Busy remains low during that time (A in diagram above), no data is output for that measure-
ment.
If Busy changes to high within that time (B in diagram above), data is output less than /msec.
after Busy changes from low to high.
Data is output immediately ¡f Busy is high when Busy check is performed (C and D in diagram
above), even if Busy changes to low while data output is in progress (D in diagram above).
Continuous measurements
(Data word 4 is “M')
Measurement-request H
signal
| Busy check ! Busy check | Busy check
H 3
na FAST - 0.8 to 1.0sec.
Data output 1 SLOW: 1.4 to 1.6sec.
L DA No data is output (Data is output Data is output
8 8
A
Pins 6 and 12 connected
As shown in the diagram above, when the measurement-request signal is held high, measurements
will be made continuously.
Busy is checked immediately after each measurement is completed (every 0.8 to 1.0 second at
FAST response speed or every 1.4 to 1.6 seconds at SLOW response speed).
If Busy is low (A in diagram), no data is output.
If Busy is high (B in diagram), data is output immediately.
38
MEASURING SYSTEM
Optical system
- OL
TT S2
- 1 SM ss. NC
| TT | IF D
ка
da
р L2
Li Objective lens C Chopper
Lo Eyepiece lens system F Spectral-response correction filter
M Total-reflection mirror D Silicon photocell
S1 Aperture stop P Porro prism
S2 Field stop G Focusing screen
The optical system of the LS-100/LS-110 is shown in the above diagram. Light from the subject
enters the objective lens (L) and passes through the aperture stop (S,). A small portion of this light
is reflected downward by the total-reflection mirror (M), while the main portion of the light con-
tinues on. This main portion passes through the chopper (C), the field stop (S2), and the spectral-
response correction filter (F), and strikes the silicon photocell (D), which converts the- light to an
analog electrical current. The spectral response of the photocell is filtered to closely match the CIE
(Commission Internationale de |'Eclairage) Relative Photopic Luminosity Response, as shown
below. |
SPECTRAL RESPONSE
Relative sensitivity
[a]
A
T
À 1 A
400 500 600 700
Wavelength (nm)
Spectral response of Minolta Luminance Meters LS-100/LS-110
----- CIE Relative Photopic Luminosity Response
The light which was reflected downward enters a Porro prism, and is directed onto the focus-
ing screen to form the viewfinder image. The measurement area is accurately indicated on the
focusing screen, and the viewfinder display allows the subject and the measured luminance to be
seen at the same time.
39
E
Electronic system
Viewfinder
External
display display
L.
||
Objective lens
ZZ Field stop { Data-output
— | | terminai
Ta .
- i-to-V cometer A -40-Dconvena]— Microcomputer
7 | Control keys/
- Chopper: Silicon photocell | switches
Spectral-response correction filter —
i
Chopper
controller
After the light has been converted to an analog electrical current by the silicon photocell, this
current is converted to a proportional voltage by a current-to-voltage (1/V) converter. This voltage
signal then enters an analog-to-digital (A/D) converter, where it is changed to a digital signal. The
digital signal is used by the built-in microcomputer of the L.S-100/LS-110, which determines the
data to be displayed on the external and viewfinder displays according to the measurement condi-
tions set by the user with the control keys and switches. These measurement conditions inciude
calibration standard, absolute or percent measurement mode, response speed, continuous or peak
mode, and whether or not the color-correction factor should be included in the calculations. |
Influence of flare
As shown in the diagram below, light sources outside the angle of acceptance of the LS-100/LS-
110 influence measurements only slightly. When a point source moves from point A (inside the
meter's angle of acceptance) to point B (outside the angle of acceptance), its measured value at B
is less than 0.1 percent of its measured value at А.
LS-100 LS-110
100% T 100% т
! 1
i {
| |
10% 10% —
i |
z | z |
> ; > 1
ET ET
un с |
c f
a a i
> 0.1% S 0.19
> 01% 2 01%—7—
++
© / | Ñ © / | N
v { i D f |
(С A Ho Lid СС i H 4 $
30 (19 0157301 1045 0 5 10 |
| |
| |
$ é
В 8
| measuring 4 Measuring
angle angie
40
MINOLTA STANDARD CALIBRATION PROCEDURE
The CALIBRATION selector switch of the LS-100/LS-110 can be set to the PRESET position for
taking measurements based on Minolta’s standard calibration. This calibration is adjusted at the
factory before shipping according to the following procedure.
=> QQ OT
(Je
r(m)
4
Luminous intensity standard lamp calibrated by the Electro Technical Laboratory of the Japa-
nese Ministry of International Trade and Industry
White transmitting diffuser plate attached to a plate with an aperture of known area
Series of baffles to insure that the influence of flare is reduced to a minimum
Meter position
. A previously calibrated illuminance meter is placed at the meter position and a measurement
of the illuminance at this point is taken.
. This illuminance measurement is used to calculate the luminance at the same position according
to the formula: |= (E x r?)
The LS-100/LS-110 to be calibrated is placed at the meter position and adjusted until the lumi-
nance in the display is equal to the value of L calculated from the above equation.
41
AT
. м \
CARE AND STORAGE
® Do not touch the front lens surface. If it becomes dirty, remove any loose dust with a blower or
compressed air, and wipe lightly with lens tissue if necessary. For safety, cover lens with the
lens cap when not using meter.
e When dirty, the meter may be wiped with a silicone-treated cloth or other clean, dry cloth. Do
not allow alcohol or chemicals to touch the meter’s surface.
e If the meter is used at temperatures higher than 40”C (104 F) or less than 0°C (32°F), opera-
tion may be unsatisfactory.
® Do not leave the meter in places subject to high humidity or to temperatures higher than 55°C
(131°F) or lower than —20°C (—4°F).
® Do not leave the meter inside a closed motor vehicle, in direct sunlight, or near sources of heat,
such as stoves, strong lights, etc.
e Never look through the viewfinder and aim the meter at the sun. Doing so may damage your
eyes and the meter’s photocell.
® Do not aim the lens at the sun at any time, even during transportation or storage. For safety,
cover lens with the lens cap when not using the meter.
Do not subject the meter to shock or vibration.
Do not press on the liquid-crystal display window.
Never attempt to disassemble the meter. Any necessary repairs should be done only by an
authorized Minolta service technician.
® When the meter is to be stored for an extended period of time, remove the battery, place the
meter in its original packaging, and put it in an airtight container with a dehumidifying agent,
such as silica gel.
42
“edits”
SPECIFICATIONS
Type:
Receptor:
Calibration:
Measuring modes:
Other measuring functions:
Optical system:
Acceptance angle:
Field of view:
Focusing distance:
Minimum target area:
Luminance units:
Accuracy:
Short-term repeatability:
Displays:
Data output:
Measuring range:
Spot luminance meter
Sillicon photocell filtered to closely match the CIE Relative Photop-
ic Luminosity Response
PRESET for Minolta standard calibration
VARI. for user-selected calibration standard
ABS. for measuring absolute luminance
% for determining percent luminance in relation to a reference
luminance in memory
PEAK function to display highest value of absolute or percent
luminance measured while measuring trigger held in; C.C.F. (color-
correction factor) to correct meter response when measuring colored
subjects or using close-up lenses
85mm f/2.8 lens: TTL (through-the-lens) viewing system; influence
of flare on measurement less than 1.5%
LS-100: 1°
LS-110: 1/3° |
9° (with circular measurement-area indication)
1014mm to infinity (205mm minimum using close-up lens)
LS-100: $14.4mm at 1014mm (61.3nm at 205mm using close-up
lens
LS-110: ¢4.8mm at 1014mm (0.4mm at 203mm using close-up
lens
cd/m? or fL selectable; calibration and reference luminance values
in memory automatically converted
LS-100: FAST: 0.001 to 299900 cd/m? (0.001 to 87530 fL)
SLOW: 0.001 to 49990 cd/m? (0.001 to 14590 fL)
FAST: 0.01 to 999900 cd/m? (0.01 to 191800 fL)
SLOW: 0.01 to 499900 cd/m? (0.01 to 145900 fL)
0.001 to 0.999 cd/m? (or fL): +2% +2 digits of measured
valuve
1.000 cd/m? (or fL) or more: +2% +1 digit of measured
valuve
0.01 to 9.99 cd/m? (or fL): +2% +2 digits of measured valuve
10.00 cd/m? (or fL) or more: +2% +1 digit of measured
valuve
(Measuring conditions: Subject: Standard llluminant A:
ambient temperature: 20 to 30°C/68 to 86°F)
LS-110:
LS-100:
LS-110:
LS-100: 0.001 to 0.999 cd/m? (or fL): +0.2% +2 digits of measured
valuve |
1.000 cd/m? (or fL) or more: +0.2% +1 digit of measured
valuve
LS-110: 0.01 to 9.99 cd/m? (or fL}: +0.2% +2 digits of measured
valuve
10.00 cd/m? (or fL) or more: +0.2% +1 digit of measured
valuve
(Measuring subject: Standard liluminant A)
External LCD panel shows measured value plus operation and error
indications; viewfinder LCD panel shows measured value
1-bit serial, ASCII code, + 5V, 4800 baud: output via Hirose RP17-
13RA-125D connector: remote control possible
43
Power source: One 9V battery (Eveready 216 or equivalent); external power sypply
may be used via data-output terminal
Operating temperature range: 010 40°C (32 to 104°F) relative humidity less than 85% at 35°C with
no condensation
Storage temperature range: -20 to +55°C (-4 to +131%F) with no condensation
Dimensions: 208 x 79 x 150mm (8-3/16 x 3-1/8 x 5-7/8 in.)
Weitht: 850g (30 oz.) without battery
Standard accessories: Lens cap, eyepiece cap, ND eyepiece filter, data-output terminal
cover, 9V battery, case
Optional accessories: Close-up lenses, data printer, long eye-relief eyepiece
Specifications subject to change without notice
44
ел
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