Hioki Hioki FT3424 Manual

FT3424

LUX METER

Instruction Manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

September 2014 Revised edition 1 FT3424A980-01 14-09H

English

Contents

Introduction .........................................................................1

Verifying Package Contents ..............................................2

Options (sold separately) ..................................................3

Safety Notes ........................................................................4

Usage Notes ........................................................................7

1 Overview 11

1.1 Overview and Features .................................11

1.2 Parts Names and Functions .........................12

1.3 LCD Display ...................................................16

2 Measurement Methods 19

2.1 Measurement Workfl ow ................................19

2.2 Inserting/Replacing Batteries ......................20

2.3 Attaching the strap .......................................22

2.4 Inspection Before Use ..................................24

2.5 Making Measurements ..................................25

2.6 Selecting the Measurement Range ..............29

3 Applied Functionality 31

3.1 Retaining the Measured Value after a
Set Amount of Time

(Timer Hold Function) ...................................31

Retaining the measured value (TIMER) ...................31

3.2 Disconnecting the Display Unit and

Sensor Unit ....................................................33

Mounting the sensor unit on a tripod ........................34

3.3 Limiting Battery Consumption

(Auto Power Off Function) ...........................35

i

Contents

3.4 Saving Measured Values

(Memory Function) ........................................36

Saving the measured value (MEM) ..........................36

Reading the measured memory data (READ) ..........37

Deleting the most recently saved measured

value (CLEAR) ..........................................................38

Clearing all the saved measurement data ................38

3.5 Logging Illuminance Data

(Output Function) ..........................................39

3.6 Communicating with PC ...............................41

3.7 Disabling the buzzer .....................................42

3.8 Turning On the Backlight ..............................43

4 Specifi cations 45

4.1 Basic Specifi cations .....................................45

4.2 Measurement Specifi cations ........................46

Accuracy ...................................................................46

Characteristic ............................................................47

4.3 Output Specifi cations ...................................48

4.4 Functional Specifi cations .............................48

4.5 General Specifi cations ................................. 49

5 Maintenance and Service 51

5.1 Repair, Inspection, and Cleaning .................51

5.2 Troubleshooting ............................................52

5.3 Error Display ..................................................54

5.4 Display Messages .........................................55

ii

Contents

Appendix Appx.1

Appx. 1 Recommended Levels of Illumination

(Reference) ........................................Appx.1

Appx. 2 Sensor Characteristics Graphs .......Appx.3

Relative Spectral Response Characteristics in

the Visible Spectrum ..........................................Appx.3

Angled Incident Light Characteristics ................Appx.4

Appx. 3 Other Characteristics .......................Appx.5

Appx. 4 Dimensional drawing........................Appx.6

iii

Contents

iv

Introduction

Introduction

Thank you for purchasing the HIOKI FT3424 Lux Meter.
maximum performance from the product, please read this manual
fi rst, and keep it handy for future reference.

To obtain

1

Verifying Package Contents

Verifying Package Contents

When you receive the instrument, inspect it carefully to ensure that
no damage occurred during shipping.
In particular, check the accessories, operation keys of the panel, and
connectors. If damage is evident, or if it fails to operate according to
the specifi cations, contact your authorized Hioki distributor or reseller.

Check the package contents as follows.

FT3424 LR6 Alkaline battery × 2

Carrying Case

(soft)

Instruction manual CD* (USB driver,

dedicated computer
application software,
and communications
specifi cations)

Strap (for instrument)

(p. 22)

Sensor cap

(with strap)

(p. 25)

USB Cable

(Length: 0.9 m)

* The latest version can be downloaded from our web site.

2

Options (sold separately)

Options (sold separately)

The following options are available for the instrument.
Contact your authorized Hioki distributor or reseller when ordering.

Connecting cable/Output cord

Use when positioning the sensor unit
and display unit separately during use.

Required when using the
instrument’s output functionality.

L9820 Connection Cable

(Length: 2 m)

9094 Output Cord

(Length: 1.5 m)

Carrying Case

Handy for storing the instrument with the L9820 Connection cable, 9094
Output cord, and USB cable.

C0201 Carrying Case

(semi-hard)

L9820 Connection Cable
cannot be stored.

C0202 Carrying Case

(soft)

3

Safety Notes

Safety Notes

This instrument is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, using the instrument in a way not described in
this manual may negate the provided safety features.
Before using the instrument, be certain to carefully read the
following safety notes.

CAUTION

• Mishandling during use could lead to damage to
the instrument. Be certain that you understand the
instructions and precautions in the manual before use.

• If persons unfamiliar with electricity measuring instrument,
another person familiar with such instruments must
supervise operations.

Notation

In this manual, the risk seriousness and the hazard levels are
classifi ed as follows.

WARNING

CAUTION

IMPORTANT

Indicates a potentially hazardous situation that may
result in death or serious injury to the operator.

Indicates a potentially hazardous situation that may
result in minor or moderate injury to the operator or
damage to the instrument or malfunction.

Indicates information related to the operation of the
instrument or maintenance tasks with which the
operators must be fully familiar.

Indicates the prohibited action.

Indicates the action which must be performed.

4

Safety Notes

*

Additional information is presented below.

Symbols affi xed to the instrument

Indicates cautions and hazards. When the symbol is printed on the
instrument, refer to a corresponding topic in the Instruction Manual.

Indicates DC (Direct Current).

Symbols for various standards

Indicates the Waste Electrical and Electronic Equipment
Directive (WEEE Directive) in EU member states.

Indicates that the instrument conforms to regulations set out by
the EC Directive.

Screen display

The screen of this instrument displays characters in the following
manner.

ABCDEFGH I J KLMNOPQRSTUVWXYZ

1234567890

A different display is used in the case below.

Displays when power is shutdown (p. 18)



5

Safety Notes

Displays when display unit and sensor unit is not
connected.



Accuracy

We defi ne measurement tolerances in terms of f.s. (full scale), rdg.
(reading) and dgt. (digit) values, with the following meanings:

(Maximum display value)

f.s.

Indicates the maximum displayable value. This is usually the
name of the currently selected range.

(Reading value)

rdg.

The value currently being measured and displayed on the
measuring instrument.

(Resolution)

dgt.

The minimum display unit, indicating a minimum digit of 1.

6

Usage Notes

Usage Notes

Follow these precautions to ensure safe operation and to obtain the
full benefi ts of the various functions.

Before Use

Verify that the instrument operates normally to ensure that no
damage occurred during storage or shipping. If you fi nd any
damage, contact your authorized Hioki distributor or reseller.

Installation

For details on the operating temperature and humidity, see the
specifi cations.(p. 49)

WARNING

Installing the instrument in inappropriate locations may
cause a malfunction of instrument or may give rise to
an accident. Avoid the following locations.

• Exposed to high temperature

• Exposed to corrosive or combustible gases

• Exposed to water, oil, chemicals, or solvents

• Exposed to high humidity or condensation

• Exposed to high quantities of dust particles

• Susceptible to vibration

When the instrument is not in use, store the instrument in a cool,
dark place because optical components are vulnerable to heat.

7

Usage Notes

Handling the cables and cords

CAUTION

• Before use, verify that the insulation on cables and
cords is not damaged and that no metal is exposed.
If you fi nd any damage, replace the cable or cord with
those specifi ed by our company, as the instrument will
not be able to make accurate measurements or send/
receive data otherwise.

• Avoid stepping on or pinching the cables and cords,
which could damage the cable insulation.

• To avoid breaking the base of connectors and jacks, do
not bend or pull them.

• Cables and cords become stiff and rigid at temperatures
of 0°C and lower. Exercise caution in such environments
as bending or pulling on cables and cords may damage
their insulation or cause them to break.

Handling the instrument

CAUTION

• The instrument consists of a sensor unit and a display
unit that can be positioned apart from one another
during operation. To avoid damage, be sure to turn off
the instrument before disconnecting or connecting the
sensor and display units.

• To avoid damage to the instrument, protect it from
physical shock when transporting and handling. Be
especially careful to avoid physical shock from dropping.

• To avoid damage to the instrument, do not short-circuit
the D/A OUTPUT terminal and do not input voltage to
the D/A OUTPUT terminal.

8

Usage Notes

IMPORTANT

• Use only the specifi ed connection cables. Using a non-
specifi ed cable may result in incorrect measurements due to
poor connection or other reasons.

• When measuring illuminance underneath a standard lighting
fi xture, the display may not stabilize. In most cases, a failure
to stabilize is due to fl uctuations in the lighting fi xture’s supply
voltage or to the surrounding environment (for example, a
person’s shadow). Exercise care concerning these factors
when performing measurement.

• The LCD display includes a backlight for use when making
measurements in dim locations. The backlight will activate
automatically when the measured value is retained or when the
measured value data stored in the internal memory is in read
mode, both in low-light environments (approx. 750
To avoid affecting measurement results, the backlight cannot
be turned on during measurement.

• The instrument’s measurement reference level (REF.LEVEL) is
the colored part in the drawing below

• Do not attempt to disassemble the instrument or subject it to
mechanical shock.

.

measurement
reference level
(REF.LEVEL)

or less).

lx

9

Usage Notes

CD disc precautions

• Exercise care to keep the recorded side of discs free of dirt
and scratches. When writing text on a disc’s label, use a pen or
marker with a soft tip.

• Keep discs inside a protective case and do not expose to direct
sunlight, high temperature, or high humidity.

• Hioki is not liable for any issues your computer system
experiences in the course of using this disc.

Precautions during shipment

Observe the following during shipment.Hioki cannot be responsible
for damage that occurs during shipment.

CAUTION

• Handle the instrument carefully so that it is not damaged
due to a vibration or shock.

• To avoid damage to the instrument, remove the
accessories and optional equipment from the instrument
before shipment.

If the instrument is not to be used for an extended
period of time

IMPORTANT

To avoid corrosion and/or damage to the instrument due to battery
leakage, remove the battery and store the instrument in a cool,
dark place if it will not be used for an extended period of time.

10

Overview

1

1.1 Overview and Features

The FT3424 is a multifunctional, high-precision lux meter which
ensures durability.

Engineered for use in a wide range of fi elds and settings,
including with lighting equipment, in lighting work, and in
equipment management.

Wide-range illuminance measurement (0.00 lx to 200000 lx)

Use the display unit and
sensor unit separately

L9820 Connection cable
(option)

Large, easy-to-read LCD
display

Backlight automatically turns on
when you retain the measured
value in a

low-illuminance

environment.

Retaining the measurement (HOLD)

Features the timer hold function.

Sensor unit

Features a luminosity fi lter
designed to approximate the
response of the human eye
with the instrument’s sensitivity
to wavelength.

Ability to send data
to a computer and
to be controlled by a

computer

Use the included dedicated
computer application
(after connecting
the instrument
with a USB cable)
to download data and control
the instrument.

Memorizes measured value

Internal memory can store up
to 99 measured values, which
can be sent together to a
computer.

11

Parts Names and Functions

3

4

6

1.2 Parts Names and Functions

Front/Right Side

Sensor unit

Illuminance

sensor

Sensor

cap

(p. 25)

Reference

level

indication

Display unit

LCD display

Operation

Lux meter could be seperated into sensor unit and display unit. (p. 33)
(Use the option L9820 Connection cable)

(p. 16)

keys

(p. 12)

Strap hole (p. 22)

USB terminal

(mini B type)

D/A OUTPUT

terminal

(p. 39)

Operation keys

1 2

3

4

5

6

12

Parts Names and Functions

1
2

3

4

Normal

for at least 1

second

Press and hold

1
2

3

4

Power ON Power OFF -

Retains the
measured value or
cancels retention of
the measured value.

• Switches the
range. (p. 29)

• Cancels read mode,
which allows you to
view the measured
values stored in the
internal memory.
(p. 37)

Performs zero­adjustment.

Start timer hold
function (p. 31)
Automatically retain
after 5 to 60 seconds
(designating the time
is possible)

Switches to auto range.

*1

• Allows you to delete
the last saved
measured value.
(p. 38)

• Cancels zero
adjustment when

is displayed.

[CAP]

Turn on the

instrument

while pressing

and holding

Cancels the
auto power off
function (APS).
(p. 35)

Displays the
software version
of the instrument.

Places the
instrument in the

*1

state that enables
all measured
values stored
in the internal
memory to be
deleted.

(p. 38)

13

Parts Names and Functions

5

6

Normal

for at least 1

second

Press and hold

5

6

*1: Read mode, which allows you to view the measured values stored in

the internal memory.

*2: The

measured values stored in the internal memory.

*3: During operation of timer hold function.

• Save measured
value in internal
memory. (p. 36)

• Increases the
memory No.

• Increases the
time remaining
on the timer.

• Decreases the
memory No.

• Decreases the
time remaining
on the timer.

and can only be operated when there are multiple

Continuously
increases the memory

*1

(p. 37)

No.

*1, *2

*3

• Loads measured

*1, *2

values stored in the
internal memory for
viewing. (p. 37)

*3

• Continuously
decreases the
memory No.
(p. 37)

*1

Turn on the

instrument

while pressing

and holding

All LCDs light up.

Sets the buzzer
sound non­activated.
(p. 42)

14

Parts Names and Functions

Tripod mounting thread

Use when mounting the sensor
unit on a tripod. The hole is located
exactly behind the center point of the
illuminance sensor on the front of the
sensor unit. (p. 34)

Collation No.

Verify that the collation numbers on
the sensor unit and display unit match
before use.

Serial No.

It is necessary for production control
such as product warranty.
Do

Do not peel off the label.

Measurement range

The measurement range of the
instrument is noted.

Battery Cover

When replacing the batteries
remove the cover.
Explains which battery to use.

See p. 20

(p. 20),

15

LCD Display

1

5

8

1
2

3

4

5

1.3 LCD Display

For message displays and error displays, see “5.3 Error Display”
(p. 54), and “5.4 Display Messages” (p. 55).

3

2

1

4

5

16

6

8

7

1
2

3

4

5

Holds measured value. (p. 26, p. 31)
Communicating with the USB. (p. 41)

The memory function is activated. (p. 36)
Instrument is in read mode, allows viewing

measured values stored in its internal memory.
(p. 37), Memory No.

The timer hold function is activated. (p. 31)
The time shown is the time remaining (in seconds)
until the measured value is retained.

/ can be operated.
(These keys are used to load measured values and
set the timer remaining time.)

Battery indicator (p. 17)
The auto power off function is activated. (p. 35)
The buzzer sound is activated. (p. 42)

The measured value exceeded the set range’s
maximum illuminance range.

LCD Display

6
7

8

6
7

8

Auto range is activated. (p. 29)
The output function has been activated. (p. 39)

Represents the unit used to measure illuminance
(lux).

When the measured value exceeds the maximum value
in each range

The maximum displayable value blinks,
and

lights up on the LCD display.



Battery indicator

Fully charged.
As the battery charge diminishes, black charge bars disappear,

one by one, from the left of the battery indicator.
The battery is almost out of charge. Have a new battery handy.

(Lights up)

The battery is exhausted. Replace with new batteries immediately.
(p. 20)

(Blinks)

The battery is exhausted. Replace with new batteries immediately.
If you keep using the instrument, the power may shutdown. (p. 20)

During USB communications and while the instrument is connected

OFF

to USB bus power, the battery indicator turns off.

The battery charge indicator is only a reference for the continuous operation time.

17

LCD Display

When using a manganese battery or nickel-hydride battery, the battery
indicator may not operate properly.

Power shutdown

When the charge is gone,
the display for 3 seconds and the power is
shut down automatically.

[b. Lo]

blinks in



18

Measurement Methods

2

2.1 Measurement Workfl ow

Before using the instrument, be sure to read “Usage Notes” (p. 7).

Installation and connection

Insert the batteries with the sensor cap on.
(p. 20)

Perform the startup check. (p. 24)

As necessary, have other
optional items available and
ready.

Measurement

Turn on the power and perform zero-adjustment.

Remove the sensor cap and start the measurement.

(As necessary)
Hold the (display of the) measured value.
Save the measurement data in the internal

memory. (p. 36)

End of the measurement

Turn the power off and put the sensor cap on.

19

Inserting/Replacing Batteries

2.2 Inserting/Replacing Batteries

Before using the instrument fi rst time, insert two LR6 alkaline
batteries. Before measurements, check that the battery level is
suffi cient. When the battery charge is low, replace the batteries.

Nickel-metal hydride batteries

Nickel-metal hydride batteries can be used. However, the discharge
characteristic of these batteries is different from that of alkaline
batteries. Be aware that the remaining battery power display does
not function properly.

WARNING

• To avoid the possibility of explosion, do not short

circuit, charge, disassemble, or incinerate batteries.

• To avoid electric shock, disconnect the output cord

and USB cable from the object to be measured
before replacing the batteries.

•

After battery replacement but before using the
instrument, reattach and screw down the battery cover.

CAUTION

Poor performance or damage from battery leakage could
result. Observe the cautions listed below.

• Do no mix new and old batteries, or different types of batteries.

• Be careful to observe the battery polarity during installation.

• Do not use batteries after their recommended expiry date.

• Do not allow used batteries to remain in the instrument.

To avoid corrosion from battery leakage and/or damage to
the instrument, remove the batteries from the instrument if
it is to be kept in storage for an extended period.

20

Inserting/Replacing Batteries

3

2

6

4, 5

• The indicator appears when the battery is almost out of
Have a new battery handy.

charge.

•

When the indicator lights up continuously or fl ashes, there
is no battery life remaining. Replace the battery immediately.

• During USB communications and while the instrument is

connected to USB bus power, the battery indicator turns off.

• Turn off the power before replacing the batteries.

• After use, be sure to turn off the instrument.

• Handle and dispose of batteries in accordance with local regulations.

Have the following items

1

available and ready.

2

• LR6 Alkaline battery × 2

Press for at least 1
second to turn off the instrument.

Rear

4, 5

3

6

Turn off the instrument.

2

Remove the battery cover.

3

Remove all of the old batteries.

4

Insert two new batteries

5

(LR6), being careful to the
battery polarity.

Reattach the battery cover.

6

21

Attaching the strap

Although you can use an R6 Manganese battery, doing so will give the
instrument a shorter continuous operating time than an alkaline battery.

2.3 Attaching the strap

You can attach the included strap (for instrument) and the strap for
the sensor cap to the strap hole on the bottom of the display unit.

CAUTION

Attach the strap securely to the instrument. If insecurely
attached, the instrument may fall and be damaged when
carrying.

When attaching one strap

22

When attaching both straps

3

2

1

1

Strap for the sensor cap

2

3

Attaching the strap

Strap (for instrument)

23

Inspection Before Use

2.4 Inspection Before Use

Verify that the instrument operates normally to ensure that no
damage occurred during storage or shipping. If you fi nd any
damage, contact your authorized Hioki distributor or reseller.

Appearance check of the instrument

Check item Action

• The instrument is neither
damaged nor cracked.

• The internal circuits are not
exposed.

Check when turning on the power

Check item Action

The battery voltage is suffi cient.

No indicators are missing. Display all indicators and ensure that no

Visually check the instrument.
If it is damaged, it could not be measured
accurately. Do not use the instrument but
send it for repair.

When the
right corner of the LCD display, replace
with new batteries immediately. If you
keep using the instrument, the power may
shutdown. (p. 20)

indicators are missing.
(p. 14, p. 16)
If any of the indicators are missing, send
the instrument for repair.

indicator appears in the top

24

2.5 Making Measurements

Put the sensor cap on.

Turn on the instrument with the

1

included sensor cap attached to
the illuminance sensor.

A value will be displayed on the LCD
display.

Making Measurements

Press to turn
the instrument.





on

Press .

2

is displayed, and zero-adjustment

[ADJ]

of all ranges will be performed.
When zero-adjustment is completed,

goes off.

[ADJ]

Remove the sensor cap, and

3

bring the sensor unit near the
measuring location.

25

Making Measurements

(To use a particular range to make a
measurement)

Press to select the range.

4

See: “2.6 Selecting the Measurement
Range” (p. 29)

Read the measured value when it

5

stabilizes.

(When retaining the measured value)

Press and read the measured
value.

Pressing again will cancel retention
of the measured value.

You can also retain the measured value
after a set amount of time elapses.
See: “3.1 Retaining the Measured Value
after a Set Amount of Time
(Timer Hold Function)” (p. 31)

26

Making Measurements

Put the sensor cap on.

Press and hold for at least
1 second to turn off the instrument.

•

• If zero-adjustment is performed immediately after the

• While the measured value is retained, zero-adjustment can not

is displayed when the measuring range is exceeded.

instrument is turned on, several count digits may remain. In that
case, perform zero-adjustment again.

be performed.

When the measurement is

6

fi nished, put the sensor cap on
and turn off the instrument.

27

Making Measurements

If is pressed without the sensor cap attached

If you press without the included
sensor cap attached to the illuminance

sensor (when the count is equivalent to 1
or greater),
LCD display.



Press
sensor cap.

will be displayed on the

[CAP]

again after attaching the

Zero-adjustment will be canceled when pressing for at least 1
second while

[CAP]

is displayed.

lx

28

Selecting the Measurement Range

2.6

Selecting the Measurement Range

Auto or Manual range can be selected.

• Auto range Sets the optimum range automatically in accordance with

• Manual range Sets the range and fi xes it specifi cally.

the actual measurement.
(Disabled when the output function (OUTPUT) is in use.)

Measuring with the auto range

The auto range measurement starts when the
instrument power is turned on.

lights up. (default setting)



Measuring with the manual range

Press .

The instrument will switch from the auto range
to manual range, which will be fi xed to the
range that was selected during auto-range



operation. (

Each time is pressed, the range is specifi ed.
200000 lx → 20.00 lx → 200.0

↑ ↓
20000

lx

goes off.)

← 2000

lx

lx

To switch to auto range

Press and hold for at least 1 second.
( lights up.)

29

Selecting the Measurement Range

While the measured value is retained, switching of the range can
not be performed.

30

Applied Functionality

3

3.1 Retaining the Measured Value after
a Set Amount of Time
(Timer Hold Function)

This section describes how to retain the measured value after a set
amount of time has elapsed.
The timer hold function is convenient when measuring low
illuminance values, for example from emergency lighting or along
an evacuation route.

Retaining the measured value (TIMER)

Press and hold for at least 1
second.

The timer hold function will be activated, and
the time remaining until the measured value



is held will be displayed (counted down) at
the top right of the LCD display. (

lights up.)

When the remaining time is 10 seconds or
more, the instrument will beep every 5 seconds.
When the remaining time is 10 seconds or less,
the instrument will beep every second.

You can change the time remaining on the
timer by pressing

while the timer hold function is active.

(Select from 5, 10, 15, 20, 30, 45, 60 seconds)
Default setting: 5 seconds

or

31

Retaining the Measured Value after a Set Amount of Time (Timer Hold Function)

The measured value will be retained once the
set amount of time has elapsed.

and lights up, and a

(
continuous beep sounds for 3 sec.)



When
state is canceled, and the timer hold function

is not activated.
( and goes off.)

is pressed again, the hold

• Pressing while the timer hold function is active
(while the timer is counting down) will cause the measured value

to be retained.

At this moment, the timer hold function is not

activated. ( goes off.)

• While the measured value is retained, switching of the range
can not be performed.

32

Disconnecting the Display Unit and Sensor Unit

3.2 Disconnecting the Display Unit and
Sensor Unit

Lux meter could be measured by disconnecting the display unit and
sensor unit.

Turn off the instrument.

1

Hold the display unit and sensor unit, and pull them apart.

2

Connect the display unit and sensor unit with L9820

3

Connection Cable (option).

Do not seperate and connect the display unit and the sensor unit
while the instrument power is on.

33

Disconnecting the Display Unit and Sensor Unit

Mounting the sensor unit on a tripod

When you need to place (fi x) the sensor unit in a location while
making measurements, you can mount it to a commercially available
tripod. Use the mounting thread* on the back of the sensor unit.

* Thread size: 1/4” (ISO 1222)

• Mount the sensor unit on the tripod after disconnecting it from
the display unit.

• When mounting the sensor unit on the tripod, turn the thread
(not the sensor unit).

• Do not lift the tripod by the sensor unit after it has been
mounted on the tripod.

34

Limiting Battery Consumption (Auto Power Off Function)

3.3 Limiting Battery Consumption
(Auto Power Off Function)

This function limits the battery consumption. If the instrument has
not been operated for approx. 10 minutes, the power turns off
automatically. In the (default setting), the auto power off function is
set to enabled. ( lights up.)
When the auto power off function is enabled, the on the
LCD display will fl ash 30 seconds before, along with the beeping
sound 15 seconds before the instrument automatically turns off.
To continuously use the instrument without turning off the power,
press any key on the front panel. When the instrument has not been
operated for approx. 10 minutes again since the key was pressed,
the power turns off automatically.

• If the instrument will be used continuously for an extended
period of time, disable the auto power off function.

• After use, be sure to turn off the instrument.

• When using the output function (OUTPUT), during USB
communications, and when connected to USB bus power, the
auto power off function will be disabled.

Disabling the auto power off function

If the instrument is on, turn it off.

Press while holding down

to turn on the instrument.

Auto power off function is disabled.



The auto power off function will be disabled until the instrument is
turned off. Exercise care concerning battery consumption.

Check that of the LCD display is not lit up.

35

Saving Measured Values (Memory Function)

y

yyy

y

y

y

3.4 Saving Measured Values
(Memory Function)

The measurement result can be saved and read using the memory
function. Up to 99 measured data can be saved.
You can also delete saved measured values. (p. 38)
Measured values saved in the internal memory can be downloaded
to a computer using the instrument’s USB communications
capability. (p. 41)

Memory function is disabled when the output function (OUTPUT)
is in use.

Saving the measured value (MEM)

Memory No.



When the internal memory is full



Press (MEMORY) while measuring.

The measured value when (MEMORY)
is pressed will be saved in the internal

memory, starting with the lowest memory No.
At this moment, the buzzer sounds, and
the memory No. and
second.

If you try to save a measured value
when the internal memory is full (when
99 measured values have been saved),
the LCD display will show
To save a new measured value to the
internal memory, you must fi rst delete
one or more previously saved measured
values. (p. 38)

lights up for 1

.

[FULL]

36

Saving Measured Values (Memory Function)

Reading the measured memory data (READ)

Memory No.

Press (READ) and hold for

1

at least 1 second.

( and lights up.)

Read mode of the measurement data
saved in the internal memory starts.



Select the desired memory No.

2

using

or . (upper right

side of the LCD display)

Continuously increase or decrease the
memory No. by holding the

for at least 1 second.
The and can only be operated

when there are multiple measured values
stored in the internal memory.

Backlight automatically turns on when
you read the measured data of the
internal memory in low-light environments
(approx. 750

lx

or less).

or

Canceling the read mode

Press (ESC). ( goes off.)

When measurement data is not saved

When no measurement data is saved in the
internal memory, press

appears in the LCD display for

[ - - - ]

approx. 1 second, and then the measurement



display reappears.

(READ) and

37

Saving Measured Values (Memory Function)

y

y

y

y

Deleting the most recently saved measured value (CLEAR)

Memory No.



You cannot delete the measured value for a specifi c memory No.
other than the last one.

Press (READ) and hold for

1

at least 1 second.

( and lights up.)

Read mode of the measurement data
saved in the internal memory starts.

Press (CLEAR) and hold

2

for at least 1 second.

The most recently saved measured value
(with the last memory No.) will be deleted.

Clearing all the saved measurement data

If the instrument is on, turn it off.

Press while holding down

1

to turn on the instrument.

Press and hold for at least

2



1 second while

All the saved measurement datas
are cleared. After
measurement display appears.

[CLr] is displayed.

blinks, the

[CLr]

38

Logging Illuminance Data (Output Function)

3.5 Logging Illuminance Data
(Output Function)

You can connect the instrument to a logger or other recording
instrument and have it generate voltage output based on measured
values.
This functionality outputs a voltage of 1 mV DC for each effective
count digit in the measured value. The voltage is updated at the
same rate as the instrument’s LCD display.

CAUTION

To avoid damaging the output cord, unplug it by grasping
the connector, not the cord.

• When using the output function (OUTPUT), the following
functions are disabled.

Auto power off function
Memory function
Auto range

• When using the output function for an extended period of time,
connect a USB cable to the instrument so that it operates on
USB bus power.

• +2.5 V signal will be output temporarily when turning the power
on, while the output cord is plugged in; however this is not a
malfunction.

39

Logging Illuminance Data (Output Function)

1, 4

2

3

Press and hold for at least 1 second to turn off the

1

instrument.
Connect the mini jack of 9094 Output Cord (option) to the

2

D/A OUTPUT terminal of the right side of the instrument.
(Set the recording instrument in advance.)

3

Connect the banana terminal of the 9094 Output Cord to
the logger or other recording instrument.

Press to turn on the instrument.

4

Connection example

Logger or other

3

2

1, 4



Perform zero-adjustment as neccesary, and select the

5

output rate by pressing

Range Output rate

lx

20

200 lx1 mV DC / 0.1

2000 lx1 mV DC / 1

20000 lx1 mV DC / 10

200000 lx1 mV DC / 100

9094 Output Cord

The voltage is output from the D/A OUTPUT
terminal, depending on the measurement
value.

1 mV DC / 0.01

lx

( lights up.)

lx

lx

lx

lx

recording instrument

. (See table below)

When each range's
full scale exceeds, the
output is 2.5 V DC.

lights up on

(
the LCD display.)

40

Communicating with PC

3.6 Communicating with PC

Using the included USB cable, it is possible to transmit data to the
PC or to control the instrument.
For details, see the communications specifi cations which
accompanies with the CD.

Install the special PC application software on the PC.

Connect to the PC.

The virtual COM ports of the PC can be used as the USB interface.

USB cable

Transmits data.

Controls the

instrument.

• When connecting a USB cable to the instrument, exercise care
to orient the connector properly.

• During USB communication, lights up on the LCD display.

• During USB communication, do not disconnect the USB cable.
Disconnecting the cable stops the communication. In that case,
a warning is displayed by the special PC application software.
Connect the USB cable again.

41

Disabling the buzzer

3.7 Disabling the buzzer

The buzzer sound is enabled when factory default settings.
Turn off the power of the instrument when changing the settings.

while holding down

Press

to turn on the instrument.

[bP oFF]

activated.



The buzzer sound is disabled until the power is turned off.

When you release , the screen will return
to the measured value display. (

is displayed, and the buzzer is not

42

goes off.)

Turning On the Backlight

3.8 Turning On the Backlight

The LCD display includes a backlight for use when making
measurements in dim locations. The backlight will activate
automatically when the measured value is retained or when the
measured value data stored in the internal memory is in read mode,

lx

both in low-light environments (approx. 750
To avoid affecting measurement results, the backlight cannot be
turned on during measurement.

Forcing the backlight to turn on

To forcibly turn on the backlight in an environment with illuminance
that is greater than or equal to approximately 750 lx, attach the sensor
cap to the illuminance sensor while retaining the measured value.

Activation and deactivation of the backlight is unrelated to the
measured value that is being retained. The illuminance sensor
continuously monitors illuminance, and the instrument determines
whether to turn the backlight on or off based on a monitored
illuminance level of approximately 750 lx.

or less).

43

Disabling the buzzer

44

Specifi cations

4

4.1 Basic Specifi cations

Classifi cations Grade JIS C 1609-1: 2006 General Class AA
Display • Display LCD display 4 digits

Measurement
ranges

• Effective display digits 2000 counts

• Display unit

• Display update rate 500 ms ± 20 ms

Range

20

2000

20000

200000

Measurement

lx

0.00 lx to 20.00

lx

lx

lx

lx

000 lx to 200000

0.0 lx to 200.0

00 lx to 20000

lx

range

0 lx to 2000

(lux)

lx

lx

1 count step200

lx

10 count step

lx

100 count step

lx

Display steps

Measurement
range selection

Auto / Manual

45

Measurement Specifi cations

4.2 Measurement Specifi cations

Accuracy

Linearity ±2% rdg.

Accuracy guarantee
conditions

Accuracy guarantee
for temperature and
humidity

Accuracy warranty
period

• f.s. (maximum display value): The maximum displayable value. This is
usually the name of the currently selected range.

• rdg. (reading value): The value currently being measured and displayed on
the measuring instrument.

• dgt. (resolution): The minimum display unit, indicating a minimum digit of 1.

(Multiply by 1.5 for display values in excess of

lx.

3,000

)
(Add ±1dgt. for display values that are less than
1/3 of the range.)

Display unit and sensor unit must bear the same
collation No.

21°C to 27°C (69.8°F to 80.6°F), 75% RH or less
(no condensation)

2 years

46

Characteristic

Measurement Specifi cations

Angled incident
light

characteristics

Response time Auto range: 5 seconds or less

Temperature
characteristic

Humidity
characteristic

Relative spectral
response
characteristics
in the visible
spectrum

Response
characteristics
in ultraviolet
and infrared
spectrums

Fatigue
characteristics

Systematic deviation f
Deviation from cosine characteristics:

Angle

30° ±2%
60° ±7%
80° ±25%

Manual range: 2 seconds or less
Deviation from value measured at 23°C (73.4°F)

between -10 to 40°C (14°F to 104°F): ±3% rdg.
Deviation from value measured in an environment with

a temperature and humidity of 23°C (73.4°F), and 45%
to 70% RH when the unit is left in an 85% to 95% RH
environment for 3 hours and then is returned to the
original environment: ±3% rdg.

Deviation from spectral luminous effi ciency (relative
luminous effi ciency) f
6% or less

Response to ultraviolet and infrared radiation :
1% or less

The change in value of 1 minute and 10 minutes after
light strikes sensor : ±1% rdg.

: 3% or less

2

Deviation from cosine

characteristics

' :

1

47

Output Specifi cations

Characteristics
regarding
intermittent light

Deviation in value when subjected to intermittent light
for 1/2 cycle at a frequency of 100 Hz or 120 Hz : ±2%
rdg.

4.3 Output Specifi cations

Output method D/A output
Output level 2 V/ range f.s.

Resolution 1 mV

Output update rate 500 ms ± 20 ms
Output accuracy ±1% rdg.±5 mV (at display count)
Output resistance 1.1 k

2.5 V is output when the range f.s. is exceeded.

Range Output rate

lx

20

1 mV DC / 0.01

200 lx1 mV DC / 0.1

2000 lx1 mV DC / 1

20000 lx1 mV DC / 10

200000 lx1 mV DC / 100

or less

Ω

lx

lx

lx

lx

lx

4.4 Functional Specifi cations

Hold function Retains the measured value.
Timer hold

function

Memory function Up to 99 measured data can be saved.

Retains the measured value after the set timer time
has elapsed after executing.
Select and set the timer time from 5, 10, 15, 20, 30,
45, 60 seconds.

48

General Specifi cations

Auto power off
function

Power shutdown When the charge is gone,

Buzzer sound Emits a buzzer sound when keys are operated,

Backlight Activates when the measured value is retained or

Zero adjustment Performs zero-adjustment.

Turns off the instrument approx.10 minutes after the
last key operation (can be canceled).

blinks in the

display for 3 seconds and the power is shut down.

when the timer hold function activates, and when it
is auto power off function. (The buzzer sound can be
canceled).

when the measured value data stored in the internal
memory is in read mode, both while the ambient
illuminance is less than 750

Zero-adjustment execution time: 3 seconds or less

[b. Lo]

lx

.

4.5 General Specifi cations

Product warranty
period

Light receiving
element

Interface USB 2.0
Operating

temperature and
humidity

Storage
temperature and
humidity

Operating
environment

3 years

Silicon photo diode

-10°C to 40°C (14°F to 104°F), 80% RH or less (no
condensation)

-20°C to 50°C (-4°F to 122°F), 80% RH or less (no
condensation)

Indoors, pollution degree 2, altitude up to 2,000 m
(6,562 ft.)

49

General Specifi cations

Power supply

Continuous
operating time

Maximum rated
power

Dimensions Approx. 78W × 170H × 39D mm (3.07″ W × 6.69″ H ×

Mass Approx. 310 g (10.9 oz.) (including the batteries)
Standard

compliance
Applicable

standards
Dustproof and

waterproof

Accessories • Instruction Manual

Options See: “Options (sold separately)” (p. 3)

LR6 Alkaline battery × 2
R6 Manganese battery × 2

Rated power voltage 1.5 V DC × 2
(Maximum allowable voltage 3.6 V DC)

USB bus power 5 V DC
Approx. 300 hours (when LR6 alkaline batteries are used)

500 mVa

1.54″ D)

• JIS C 1609-1: 2006 General Class AA

• DIN 5032-7: 1985 Class B

• Safety: EN61010

• EMC: EN61326

IP40 (EN60529)

To avoid any failure, do not allow the instrument
to get wet. If the instrument gets wet, have your
authorized Hioki distributor or reseller inspect
or repair it, if necessary.

• LR6 Alkaline battery × 2

• Sensor cap (with strap)

• Carrying Case (soft)

• Strap (for instrument)

• USB cable (0.9 m)

• CD (USB driver, dedicated computer application
software, and communications specifi cations)

50

Maintenance and Service

5

5.1 Repair, Inspection, and Cleaning

Calibrations

IMPORTANT

Periodic calibration is necessary in order to ensure that the
instrument provides correct measurement results of the specifi ed
accuracy.

The calibration interval for this instrument is 2 years. It is
recommended to calibrate it every 2 years for accurate measurement.

Cleaning

• To clean the instrument, wipe it gently with a soft cloth moistened
with water or mild detergent.

• Wipe the illuminance sensor and the LCD display gently with a
soft, dry cloth.

IMPORTANT

Never use solvents such as benzene, alcohol, acetone, ether,
ketones, thinners or gasoline, as they can deform and discolor the
case.

Disposal

Handle and dispose of the instrument in accordance with local regulations.

51

Troubleshooting

5.2 Troubleshooting

• When a malfunction of the instrument is suspected, check the
information in “Before sending the instrument for repair” and then,
if necessary, contact your authorized Hioki distributor or reseller.

• When sending the instrument for repair, remove the batteries and
pack it carefully to prevent damage during transportation.
Include cushioning material so the instrument cannot move
within the package. Be sure to include details of the problem.
Hioki cannot be responsible for damage that occurs during
transportation.

Before sending the instrument for repair

Symptom Check and/or remedy

Nothing appears in
the display.
Or the display
disappears after a
short time.

The display does
not stabilize and the
value fl uctuates; it is
diffi cult to read the
value.

The range can not be
changed.

Check that the batteries are not exhausted. (p. 17)
Replace with new batteries. (p. 20)
When using a manganese battery or nickel-hydride
battery, the battery indicator may not operate
properly.

When the auto power off function is enabled and
the instrument has not been operated for approx.
10 minutes, the power turns off automatically.
Check the setting of the auto power off function.
(p. 35)

When measuring illuminance underneath a
standard lighting fi xture, the display may not
stabilize. In most cases, a failure to stabilize is due
to fl uctuations in the lighting fi xture’s supply voltage
or to the surrounding environment (for example, a
person’s shadow). Exercise care concerning these
factors when performing measurement.

While the measured value is retained, the range
can not be changed. Please cancel the hold
function.

52

Symptom Check and/or remedy

Turning on the power
brings up the error
display.

When nothing is
connected, the error
display appears.

Send the instrument for repair.
Refer to “5.3 Error Display” (p. 54)

Frequently asked questions (FAQ)

Question Solution

Would like to perform
zero-adjustment.

Can rechargeable
batteries be used?

Would like to control
multiple instruments
with 1 PC.

The instrument cannot
communicate with the
PC.

Would like to know
commands.

Would like to perform
communication using
own software.

Perform zero-adjustment.
Refer to “2.5 Making Measurements” (p. 25)

Nickel-metal hydride batteries can be used.
However, the discharge characteristic of
these batteries is different from that of alkaline
batteries. Be aware that the remaining battery
power display does not function properly.

It is possible to control multiple instruments by
connecting the USB cable.

• Check the communication setting between
the instrument and the PC. For details, see
the communications specifi cations which
accompanies with the CD.

• Check that the USB cable is connected
correctly. (p. 41)

• Verify that the illuminance sensor is not dirty.

To communicate with the instrument and PC,
installation of the USB driver and special PC
application software is necessary.
For details on communication commands,
see the communications specifi cations which
accompanies with the CD.

Troubleshooting

53

Error Display

5.3 Error Display

Error display Description Solution

Err 01

Err 02

Err 04

ROM error
Malfunction of the program.

ROM error
Malfunction of the adjustment
data.

EEPROM error
Malfunction of the memory data.

When the error appears
in the LCD display, it is
necessary to repair the
instrument.
Contact your authorized
Hioki distributor or
reseller.

54

Display Messages

5.4 Display Messages

Display Description Reference

Performing zero-adjustment. p. 25

The battery is exhausted.
Replace the batteries.

Disabling the buzzer. p. 42

Zero-adjustment cannot be performed
since the sensor cap in not covered.
Affi x the sensor cap.

All saved measured values will be deleted.
Continue?

An internal ROM or EEPROM error has
occurred.
Send the instrument for repair.

The internal memory is full.
Delete the measured data in the internal
memory.

The display part and sensor unit is not
connected.
Connect the display unit and sensor unit,
either directly or with a cable.

There is no measured data saved in the
internal memory.

p. 20

p. 28

p. 38

p. 54

p. 38

p. 37

-

55

Error Display

56

Appendix

Appx. 1 Recommended Levels of

Illumination (Reference)

Suitable levels of illuminance (according to the JIS standard Z 9110).

Offi ces

Recommended
illuminance [lx]

750 500 to 1000 Design rooms, offi ces, board rooms
500 300 to 750
300 200 to 500

200 150 to 300 Kettle rooms, locker rooms, restrooms

Illuminance

level [lx]

Place/work activity

Computer rooms, conference rooms,
reception rooms

Reception area, dining rooms, elevator halls

Factories

Recommended
illuminance [

1500 1000 to 2000

750 500 to 1000
500 300 to 750

150 100 to 200 Stairways, loading and unloading

50 30 to 75 Indoor emergency stairways

Illuminance

lx

]

level [lx]

Place/work activity

Extremely precision visual work such
as producing precision mechanical
equipments and electronic parts

Precision visual work such as analyzing in
chemical factories

Ordinary visual work in manufacturing plants

Appx.1

Recommended Levels of Illumination (Reference)

Schools

Recommended
illuminance [

1000 750 to 1500

750 500 to 1000 Precision drawing or drafting
500 300 to 750

300 200 to 500
100 75 to 150 Corridors, connecting corridors, entrance

Illuminance

lx

]

level [lx]

Place/work activity

Precision handicraft, precision experimenting

Experiment demonstration rooms, library
reading rooms, nurse’s offi ce, kitchen

Classrooms, gymnasium, offi ce rooms,
cafeteria

Appx.2

Sensor Characteristics Graphs

Appx. 2

Sensor Characteristics Graphs

Relative Spectral Response Characteristics in the
Visible Spectrum

Human perception of brightness ranges from 380 nm to 780 nm in
the wavelength and is the maximum at 555 nm. The International
Commission on Illumination (CIE) has established comparative
standards for luminosity, setting the maximum perception for 1
and indicating the amount of perception of each wavelength by the
relative value, and calculating the average of many people. In this
instrument, the relative spectral response characteristics are close
to the comparative standards for luminosity.
The deviation from the comparative standards for luminosity is
determined by the f1’ value of JIS standard C 1609-1:2006.

1.2

1.0

0.8

0.6

0.4

0.2

Relative spectral responsivity㻌

0.0
350 400 450 500 550 600 650 700 750 800 850

Wavelength

[ nm ]



Deviation from spectral
luminous efficiency

FT3424



Graph illustrates typical characteristics. Characteristics exhibited
by individual products may vary slightly.

Appx.3

Sensor Characteristics Graphs

Angled Incident Light Characteristics

It is known that the luminance is proportional to the cosine of the
incident angle of light (the cosine law).
In this instrument, the shape of the light sensor, hook etc. is so
made that it can follow the cosine law closely.

1.2

1.0

㻌㻌

0.8

0.6

0.4

0.2

0.0

Angled Incident Light Characteristics

0 102030405060708090

Incident angle

[ ° ]

Ideal Characteristics

㻌㻌㻌

(㻌

ș)

cos

FT3424

Graph illustrates typical characteristics. Characteristics exhibited
by individual products may vary slightly.

Appx.4

Other Characteristics

Appx. 3 Other Characteristics

Color correction factor for a general light source relative to standard illuminant A

Light source k

Fluorescent lamp F6 1.003
Fluorescent lamp F8 1.002
Fluorescent lamp F10 1.002
High-pressure sodium lamp 1.011
Metal halide lamp H1 1.002
Metal halide lamp H2 1.003
High-pressure mercury lamp 0.995

Table shows typical characteristics. Characteristics exhibited by
individual products may vary slightly.

Range of distances in which the law of inverse squares relative to distance applies

50 cm from the measurement reference level

Incidence uniformity

The instrument is designed to be used under conditions in which the
illuminance distribution on the sensor surface is roughly uniform.
An error component will be introduced into measurements if the
illuminance distribution on the sensor surface is non-uniform, for
example when measuring a light source with strong directionality.

Appx.5

Dimensional drawing

Appx. 4 Dimensional drawing

Unit : mm

㻌㻟㻝㻚㻟㻌

㻾㻱㻲㻚㻸㻱㼂㻱㻸

㻌

㻝㻣㻜㻌

㻌

Appx.6

㻌㻣㻤㻌

㻌

䃥㻞㻜

㻌

㻌

㻌㻟㻥㻌

㻌

Center of
tripod mounting
thread

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