Sentry ST520 User manual

520/ 522
Chroma Meter
Instruction Manual
使用說明書

Table Content
1. Product Introduction ------------------------------ 1
1-1 Features ------------------------------------------- 1
1-2 Applications --------------------------------------- 1
2. Safety Information --------------------------------- 2
2-1 Safety Symbols ----------------------------------2
2-2 Warning ----------------------------------------- 3
3. Specifications ------------------------------------- 5
4. General Descriptions --------------------------- 6
4-1 LCD and Control Panel --------------------- 6
4-2 Rear ---------------------------------------------- 7
4-3 Probe ------------------------------------------- 7
4-4 Battery Change -------------------------------- 8
5. Operation Instruction ------------------------ 9
5-1 Main Function ----------------------------- 9
5-2 SET Function ------------------------------------ 15
5-2-1 Using the Measured Values ----------- 17
5-2-2 Using the Previous Values ------------- 21
6. Maintenance ------------------------------------ 25

1
1. Product Introduction
Thank you for purchasing the Chroma Meter. Read through
this instruction manual before operating the meter. Please also
store and retain this instruction manual for future reference.
1-1 Features
Precision instrument for light illuminance and color
coordinate.
MeetCIE(International CommissiononIllumination) photopic
spectral response.
Illuminance measurement.
Color temperature and Correlated color temperature
measurement.
Color coordinate measurement.
Custom reference value of color difference mode.
Measuring light source selection.(522)
Low battery indicator.
Auto power off saves battery life.
Automatic backlight LCD and triple reading display.
Data Hold function.
Lux or foot-candle unit selection.
Magnetic mount.
Tripod socket.
1-2 Applications
Color LED Lighting.
Interior room lighting.
Street lighting.
Greenhouse lighting.
Commercial displays.

2
Film and television.
Projection halls.
Art galleries.
Warehouses.
Museums.
Stadiums.
Arenas.
2. Safety Information
Read the following safety information carefully before attempting
to operate or service the meter. Only qualified personnel should
perform repairs.
2-1 Safety Symbols
CE Certification.
This instrument conforms to the following standards:
EN61326: Electrical equipment for measurement, control and
laboratory use.
IEC61000-4-2: Electrostatic discharge immunity test.
IEC61000-4-3: Radiated, radio-frequency, electromagnetic
field immunity test.
IEC61000-4-8: Power frequency magnetic field immunity test.
Tests were conducted using a frequency range of 80-1000MHz
with the instrument in three orientations. The average error for
the three orientations is ±3% at 3V/m throughout the spectrum.
However, between 180-500MHz at 3V/m, the instrument
permissive loss of performance is specified by the
specifications.

3
Restrict to use of six substances within electrical and
electronicequipment(EEE),therebycontributingtothe protection
of human health and the environment.
REACH (SVHC) The device of used materials content no
following substances that list of proposed REACH substances of
very high concern.
The device may not be disposed of with the trash. It
promotes the re-use recycling and other forms of
recovery of used materials and components, and to
improve the environmental performance of all operators
(manufacturers, traders and treatment facilities) involved in the
life cycle of products. Dispose of the product appropriately in
accordance with the regulations in force in your country.
2-2 Warning
Be sure to adhere to the following points to avoid injury.
Please read the manual carefully to ensure safe and correct
use of this meter before using. Please reread if necessary.
Do not immerse the meter in water.
Do not disassemble or modify the meter.
Do not attempt to repair it yourself if the meter is malfunction.
Only qualified personnel may do it.
Do not press, push or strike the LCD and receptor head.
Do not use the meter in places where flammable or nearby
the fire.
Do not use this meter in environments outside this range：
32ºF (0°C) to 122ºF (50°C) at Relative Humidity no higher
than 80%.

4
When using is complete, close the receptor cover.
Be aware the accumulation of irradiations would cause the
sensor continue to age. Please keep away the light source
and cover with the cap when the unit is not in use.
If the meter will not be used for a long time, remove the
battery and close the receptor cover.
Never use organic solvents to clean the meter.（such as
thinner, benzene, etc.）

5
3. Specifications
Model
520
522
Sensor Element
SPC（Silicon Photocell）
Measuring Light Sources
Selection
General Light Source
FL (Fluorescent light source)
INC (Incandescent light source)
LED (LED light source)
Measuring Function
Illuminance：Ev（lx or fcd）
Color Coordinate：（x, y）,（u', v'）（ CIE 1960）
Correlated Color Temperature：CT, ⊿uv
Color Difference：（ ⊿Ev, ⊿x, ⊿y）,（⊿Ev, ⊿u', ⊿v'）,
（⊿Ev,⊿u'v'）（ One set of reference color）
Correlated Color Temperature
Difference Measurement (⊿CT)
NO
YES
Measuring Range
Ev：0~80000 lx（0~7432 fcd）CT：99990 K Max.
Accuracy(at 25°C, 60% RH)
Ev：±（3%+2 Digital）（3000 lx, standard illuminant A measured）
x, y：± 0.02 （100 lx, RGB LED Light）
Resolution
Ev：1（0~9999）， 10（Over 10000）, lx ;
0.1（0.0~999.9）， 1（Over 1000）, fcd ;
CT：1（0~9999）， 10（Over 10000）, K ;
x, y：0.001 ; u', v'：0.001
Response Time
Approx. 1 sec.
Repeatability
x, y：±0.003 （100 lx, RGB LED Light）
Temperature Drift
Ev：±（5%+2 Digital）（3000 lx, standard illuminant A measured）
x, y：± 0.008（100 lx, RGB LED Light）
Humidity Drift
Ev：±（3%+2 Digital）（3000 lx, standard illuminant A measured）
x, y：± 0.005（100 lx, RGB LED Light）
Operation Temperature
32°F to 122°F (0°C to 50°C)，Less than 80% RH
Store Temperature
14°F to 140°F (-10°C to 60°C)，Less than 85% RH
Battery life
70 hours or longer continuous use
Multi-Display
Triple readings
Over range indication
Yes （〝－H I－〞）
Data Hold
Yes
Low battery indication
Yes
Auto Power Off
30 Minutes of idle
Weight
6.3 oz.（179g）without battery
Dimensions
Main Instrument：5.5 x 1.9 x 1.1 inch（140 x 49 x 29 mm）
Sensor Probe：6.5 x 2.0 x 1.4 inch（165 x 50 x 36 mm）
Accessories
9V Battery x1 , Instruction manual x1 , Carrying case x1
※The addition function for 522 is denoted as (522) in the
following paragraph.

6
4. General Descriptions
4-1 LCD and Control Panel
A. Data Hold Symbol
B. SET Function Symbol
C.Low Battery Symbol
D.Measuring Symbols of
Primary Reading
E. Measuring Symbols of
Secondary Reading
F. Measuring Symbols of
Tertiary Reading
G.Illuminance Unit (lx or fcd)
Symbol
H.Primary Reading
I. Color Temperature Unit (K)
Symbol
J. Secondary Reading
K. Light Source Symbol (FL,
INC or LED) (522)
L. Tertiary Reading
M. Unit / Down Button
N. Mode Button
O.⊿（Color Difference）
/ Up Button
P. Power and Hold Button

7
4-2 Rear
4-3 Probe
Q. Tripod Socket
R. Battery Cover
S. Magnet Position
T. Anti-slippery Pad
U. Receptor Head
V. Receptor Cover
W.Grip

8
4-4 Battery Change
The meter is powered by a 9V battery. When the symbol
appears, the battery voltage drops below the level for reliable
operation, the user has to replace a new battery. Turn the meter
off first, open the battery cover on the back and replace the
battery in the battery compartment.
Step1
Step2

9
5. Operation Instruction
5-1 Main Function
Power ON／OFF
Press and hold the Power button for 2 seconds to turn the meter
on. Then all of symbols will appear for 2 seconds on the LCD.
After power-on, the meter will measure and show the readings
on the LCD continuously. Repeat to press and hold the Power
button for 2 seconds again to turn the meter off.
Measuring Units
Press the button to select the illuminance (Ev) unit：Lux
（lx）or foot-candle（fcd）
Measuring light source selection(522)
After power-on, user is suggested to select the type of light
sources to be measured.
In the CT or ⊿CT display mode, press button for 3
seconds to select different light source for measuring. There are
three different light sources can be selected：FL(Fluorescent),
INC(Incandescent) and LED.
The CT value will be more accurate when the selected light
source is correspondent with the light source is being measured.
If the CT value displays “----”, it represents the measured CT
value exceeds the light source’s defined value, please select
different light source for measuring.

10
Example: Switch FL light source to INC light source.
Data Hold
During measuring, press the HOLD button once to hold the
measured values and the HOLD symbol will appear on the LCD.
Press HOLD button again to return to measure.
Hold for 3 Secs.
FL Light source
INC Light source

11
Measuring Modes
Color measurement and color difference are switchable by
pressing MODE and button.
Both of them also have 3 modes to select：
‧Color Measurement：
1. Ev, x, y （Illuminance, Color coordinate）
2. Ev, u', v' （Illuminance, Color coordinate, CIE1960）
3. Ev, CT, ⊿uv （Illuminance, Color temperature）
Press the MODE button to toggle in the color measurement.
‧Color Difference：
1. ⊿Ev, ⊿x, ⊿y (Color difference of Illuminance and Color
coordinate)
2. ⊿Ev, ⊿u', ⊿v' (Color difference of Illuminance and Color
coordinate, CIE1960)
3. ⊿Ev, ⊿CT(522),⊿u'v' (Color difference of Illuminance
and Color temperature)
This function provides the users to measure or check the
difference of illuminance, color coordinate color and color
temperature between two or more than two light sources.
Press the button to toggle the color difference mode.

12
Measuring Modes Diagram
⊿Ev
⊿x
⊿y
⊿Ev
⊿u'
⊿v'
⊿Ev
⊿u'v'
⊿
Ev
x
y
Ev
u'
v'
Ev
CT
⊿uv
MODE
Color
Measurement
Color
Difference
MODE ⊿
⊿CT(522)

13
‧LCD Display in the Color Measurement：
1. Ev, x, y （Illuminance, Color coordinate）
2. Ev, u', v' （Illuminance, Color coordinate, CIE1960）
3. Ev, CT, ⊿uv （Illuminance, Color temperature）

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‧LCD Display in the Color Difference：
1. ⊿Ev, ⊿x, ⊿y(Color difference of Illuminance and Color
coordinate)
2. ⊿Ev, ⊿u', ⊿v'(Color difference of Illuminance and Color
coordinate, CIE1960)
3. ⊿Ev, ⊿CT(522), ⊿u'v'(Color difference of Illuminance and
Color temperature)

15
5-2 SET Function
Color Difference：This function allows user to set certain
reference values （Evref, xref, yref, u'ref, v'ref, CTref(522)）to
compare with the target color.
Set the Reference Value
You can select one of these color difference modes to set：
1. ⊿Ev, ⊿x, ⊿y
2. ⊿Ev, ⊿u', ⊿v'
3. ⊿Ev, ⊿CT(522), ⊿u'v’
In the Color Difference mode, press the button and hold
for 3 seconds into set mode.（See diagram 5-2a）
Diagram 5-2a set reference values
Color
Difference
⊿Ev ⊿x ⊿y
⊿Ev ⊿u' ⊿v'
⊿
SET
Evref / xref / yref
SET
Evref / u'ref / v'ref
⊿
Set the
Reference Value
Hold for 3 secs.
⊿
⊿SET
Evref / CTref (522)
Hold for 3 secs.
⊿Ev ⊿CT(522) ⊿u'v'

16
Set the reference values in either of two methods：
5-2-1. Using the measured values and adjust it manually as
the reference values.
5-2-2. Using the previous values stored in memory and adjusts
it manually as the reference values.
The difference between method 5-2-1 and 5-2-2 is whether the
Data Hold was enabled before entering the set mode.（See
diagram 5-2b）
Note：
Color difference =（Measured value）–（Reference value）
Example:
⊿Ev = Evmeas –Evref
⊿x= xmeas –xref
⊿y = ymeas –yref
⊿u' =
u'meas –u'ref
⊿v' =
v'meas – v'ref
⊿CT =
CTmeas –CTref (522)
Diagram 5-2b
Evref xref /u'ref yref /v'ref
Color
dirrerence
mode
MODE
Adjust value Set the
Reference Value
Using the
measured values
Using the previous
values recorded
⊿
Hold for 3 secs.
Data
Hold
5-2-1.
5-2-2.
/CTref
Data
Hold
NOT
(522)