Sekonic SPECTROMASTER C-800 User manual

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Spectrometer for Photo/Video/Cinema
SPECTROMASTER
Please read the operating manual carefully to fully understand the features of this product
before use and keep it for future use. Keep the operating manual in a safe place.
Please see the Startup Guide for information about the basic operations.
C-800
C-800-U
Operating Manual

Congratulations on your purchase of a Sekonic SPECTROMASTER C-800 Series.
Please read this operating manual to utilize the many features of the SpectroMaster
C-800 Series.
The SPECTROMASTER C-800 Series is a high-performance color meter with a
CMOS linear image sensor. The SPECTROMASTER C-800 Series makes it possible
to precisely measure LED, HMI, Fluorescent lamp, natural light and ash light with
color matching function (human eye's characteristic).
The C-800 benets photographers and cinematographers by enabling the evaluation
of light through various color rendering properties, spectral graphs as well as color
temperature and lter compensation functions.
The application software of "C-800 Utility" can be used to save the measurement
and graphic display, change the meter setting and update the rmware while meter is
connected to computer or tablet by USB cable.
* Download the Utility from www.sekonic.com, and install it on your computer.
URL: www.sekonic.com/support/downloads/dtssoftwareformacandwindows.aspx
To use this Utility, connect your computer to the C-800 Series using a USB cable
(Mini-B type, available commercially).
C-800 Series
C-800 International version except US
C-800-U US version
©2018 All Rights Reserved.
■Terminology and Trademarks
●Windows is a registered trademark of Microsoft Corporation in the United States and/or
other countries.
●The ofcial name of Windows is "Microsoft®Windows®Operating System".
●Macintosh and Mac OS are registered trademarks of Apple Computer, Inc. in the United
States and/or other countries.
●Rosco, Cinegel and E-Colour+ are the registered trademarks of Rosco Laboratories Inc.
●LEE is a registered trade mark of Lee Filters, a division of Panavision Europe Ltd.
●Kodak and Wratten are trademarks of Eastman Kodak Company.
●Fujilm is a registered trademark of Fujilm Corporation.
●X-Rite and ColorChecker are trademarks or registered trademarks of X-Rite,
Incorporated in the United States and/or other countries. All rights reserved.
●All other company or product names are trademarks or registered trademarks of the
respective companies.

i
■Safety Precautions
Before using this product, please read this "Safety Precautions" for proper operation.
WARNING
The WARNING symbol indicates the possibility of death or serious
injury if the product is not used properly.
CAUTION
The CAUTION symbol indicates the possibility of minor to moderate
personal injury or product damage if the product is not used properly.
NOTICE The NOTICE symbol indicates cautions or restrictions when using the
product. Please read all notes to avoid errors in operation.
NOTE
The reference symbol indicates additional information about the
controls or related functions.
Reading these is recommended.
The arrow indicates reference pages.
WARNING
●Infants or toddlers may accidentally wrap the strap around their neck, so
please place it in a location out of their reach. There is a danger of suffocation.
●Do not place batteries in open ames, attempt to short, disassemble or apply
heat to them, use unspecied batteries, or recharge them (except rechargeable
batteries). They may burst and cause res, serious injury, or damage to the
environment.

ii
CAUTION
●Do not handle this product with wet hands, or leave it in the rain or in a
location where it may be splashed with water, submerged, or come into
contact with moisture. There is a danger of electric shock if the "Flash Light
Cord (PC) Mode" is used.
This may also result in damage to the product.
●Do not attempt to disassemble the product for modication or parts
replacement. It may affect measurement results or damage the meter.
●Any signicant impact to the meter housing or LCD screen can cause physical
damage and failure of performance.
Even when the meter is in the bag or pocket, damage is possible under
severe impact or pressure conditions.
●Gently tap the meter's LED panel when changing modes or making selections.
Using pointed pens or pencils may scratch the LCD screen or damage the
product.
●Infants or toddlers may accidentally grab the strap and swing the product, so
please place it in a location out of their reach, as the meter may be damaged
by impacts.
●Be careful that the neck strap does not come loose when carrying the product,
as the meter may be damaged when dropped.
●This neck strap is made of polyester ber.
Please refrain from using the product if synthetic bers cause your skin
to become irritated, inamed or itchy in order to prevent worsening your
symptoms.
■CA Prop 65
WARNING
This product can expose you to chemicals including lead,which is known
to the State of California to cause cancer, and Di(2-ethylhexyl)phthalate
(DEHP),which is known to the State of California to cause birth defects or
other reproductive harm.
For more information, go to www.P65Warnings.ca.gov.

iii
NOTICE
●A protective sheet is attached to the LCD. Peel it off before use.
●Although the LCD monitor is manufactured to very high standards, it is possible to
observe a few dead pixels on the screen. This is normal and not a malfunction of the
meter.
●Do not use at altitudes above 2,000m (6,561 feet).
●Our company shall not be liable for any data loss caused by, but not limited to, malicious
acts and control errors.
●Be sure not to drop the meter or subject it to sudden impacts, as the meter will be
damaged.
●Do not store the meter in areas of high temperature of high humidity, as the meter will be
damaged.
●Be careful not to transport the meter from cold to warm moist conditions as condensation
will form on the meter and may damage it.
●If the meter is operated in temperatures below -10°C, the response of the LCD will
greatly slow down and the display may be difcult to view and read. This will not harm
the meter. Also, if the temperature exceeds 50°C, the liquid crystal display will darken
and become difcult to read, but when it returns to room temperature it will return to its
normal condition.
●If the meter is left in direct sunlight, a vehicle, or near a heater, the unit's temperature will
rise and may result in damage. Please be careful when using the meter in these types of
locations.
●If the meter is left where corrosive gases may be generated, the gases may affect the
product and may result in damage. Please be careful when using the meter in these
types of locations.
●In case of disposing the meter, follow the rules of disposal in your area.
Maintenance Notes
●Be careful not to let the Light Receptor become dusty, dirty, or scratched as this may
affect the precision of the measurement.
●If the meter becomes dirty, wipe it with a dry, soft cloth. Never use organic solvents such
as thinner or benzine.
NOTE
●For used batteries, dispose of them according to the rules of your area.
●Insulate plus and minus terminals with tape or other insulation material.
●Do not disassemble the batteries.

iv
■Intended Usage
The meter is designed for:
●Measuring natural or articial lights to display the various readings for photography
and motion picture.
●Displaying the correction values of lters for camera or lighting to match to the
target color temperature.
●Managing the aged deterioration of light sources.
●Managing the light source for viewing printed color proofs.
●Checking the color rendering properties of a light source.
Main features of the C-800
Usage Features
Lighting control
for still and motion
capture
●Measure all lights (LED, HMI, Tungsten, Fluorescent lamp,
natural light and ash light) with the bandwidth from 380nm to
780nm.
●Display the various color rendering properties such as CRI, SSI,
TLCI, TLMF, and TM-30-15.
●Display the enhanced measurement units.
(1) Color temperature (K= Kelvin)
(2) Color deviation ( uv)
(3) LB/CC index
(4) LB/CC Camera lter number (KODAK WRATTEN 2, FUJIFILM,
LEE)
(5) LB/CC Light lter number (LEE, ROSCO)
(6) Illuminance/luminous exposure (ambient light/ash light)
(7) TM-30-15 (Rf, Rg)
(8) SSI (comparison with known standards or memorized value)
(9) CIE1931 chromaticity (x, y)
(10) Hue/Saturation
(11) CRI (Ra, R1 to R15)
●Various Display modes
(1) Text mode
(2) Spectrum graph/comparison mode
(3) CRI/comparison mode
(4) TM-30-15 mode
(5) SSI mode
(6) TLCI/TLMF mode
(7) Filter (Camera/Light) mode
(8) Multi Lights mode
(9) White balance correction mode

v
■Intended Users
The C-800 Series is intended for image makers involved in the photography and motion
picture industries, and those who manufacture and rent the light sources which they use.
In addition, the C-800 Series is intended for architectural interior lighting design.
■Restrictions
There are some cautions and restrictions regarding the use of this product.
Please read and understand the following before using the meter.
NOTICE
●The contents of this manual may be subject to change for the product’s specication
modications and other reasons without prior notice.
We recommend that you download the latest operating manual from our website and use
this product.
URL: www.sekonic.com/support/instructionmanualuserguidedownload.aspx
●The safety-related precautions such as «Safety Guide and Maintenance» and «Safety
Precautions» conform to the legal and industry standards that were applicable at the time
this operating manual was created. Therefore, this manual may not contain the latest
information. If you are using the previous operating manual, please download and refer
to the latest operating manual.
●The product may contain printing materials such as cautions related to safety and/or
printing errors as a supplement to the operating manual.
●The contents of this operating manual may be reproduced for non-commercial purposes
and for personal use only. However, the reproduced material must contain the copyright
notice of our company.
●The reproduction of all or any part of this document without permission is strictly
forbidden.
●The product concerned and/or this manual may be subject to future changes without
prior notication.
●The screens in this operating manual may differ from the actual displays of the meter you
are using. (Colors, letters, etc.)

vi
■Accompanying Accessories
The following items are included with the meter in the package. Please be sure to check
that all noted items are included.
* If any items are missing, please contact the distributor or the reseller you purchased the
meter from.
* The USB cable (Mini-B connector) is not included in the package. Please obtain this
separately.
* Batteries (two AA) are not included in the package. Please obtain these separately.
Meter Soft Case
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Neck Strap
Quick Guide Safety Precaution
日本語
カラーメーター
スタートアップガイド
English Color Meter Startup Guide
Spektrometer
Deutsch Startanleitung
Français
Spectromètre pour
Guidededémarrage
Español Espectrómetro Guíadeinicio
Italiano Spettrometro Guidaintroduttiva
中文 光谱仪适用于照相摄影
使用简介
C-800
SPECTROMASTER
Safety Precaution
For Proper Operation
Before using this product, please read this "Safety Precautions" for
proper operation.
WARNING
The WARNING symbol indicates the
possibility of death or serious injury if the
product is not used properly.
CAUTION
The CAUTION symbol indicates the
possibility of minor to moderate personal
injury or product damage if the product is
not used properly.
NOTICE
The NOTICE symbol indicates cautions
or restrictions when using the product.
Please read all notes to avoid errors in
operation.
General Safety Information
• Read the Operating Manual before use.
• Keep the Operating Manual on hand for reference at any
time.
• Stop using this product when there are any abnormalities.
• The modication or disassembly of this product is prohibited.
• Do not attempt to repair this product by yourself.
• This product is intended only for persons with expert
knowledge.
• Monitor children so that they do not touch this product.
• Use this product in a usage environment described in the
Operating Manual.
• This product is not waterproof.
WARNING
There is a danger of electrical shock when using high
voltage strobes.
Avoid contacting the terminals.
This product emits electromagnetic waves.
Do not bring this product close to persons with
pacemakers.
Do not use this product in an explosive atmosphere.
Use of devices emitting electromagnetic waves is
prohibited in hospitals.
CAUTION
• Check the material of the neck strap to see if there is any
risk of allergy.
• Be careful of sudden emission of lights from strobes.
NOTICE
• Do not leave this product on car dashboards in hot weather.
This may damage the product.
• Remove the batteries when this product is not in use for a
long period of time.
• When the desired performance is not achieved, stop using
this product and contact the service center.
Information for Users on Collection and
Disposal of Old Equipment
To protect environment, do not through this device
and batteries away with the normal household waste
at the end of those life, but bring them in at an
ofcial collection point of your country for recycling.
English

vii
1. Parts Designations and Functions ........................................................................................ 1
1-1 Parts Designations ................................................................................................................... 1
1-2 Parts Functions ......................................................................................................................... 2
2. Before Use ................................................................................................................................................ 3
2-1 Attaching the Strap .................................................................................................................. 3
2-2 Installing the Batteries ............................................................................................................. 4
2-3 Power ON/OFF ......................................................................................................................... 5
2-4 Automatic Power OFF Function ............................................................................................ 9
2-5 Checking the Battery Capacity ............................................................................................ 10
2-6 Replacing Batteries ............................................................................................................... 11
3. Screen Operation .............................................................................................................................. 12
3-1 Screen and Operation ........................................................................................................... 12
3-1-1 Basic Screen and Operation ................................................................................................ 12
3-1-2 Icon Operation ........................................................................................................................ 16
3-1-3 Input of Numbers/Characters .............................................................................................. 17
3-1-4 Locking and Unlocking the Screen ..................................................................................... 19
4. Basic Operations ............................................................................................................................... 20
4-1 Basic Measurement Flow ..................................................................................................... 20
4-2 Selecting the Measuring Mode ............................................................................................ 22
4-2-1 Matching Measuring Mode with Light Sources ................................................................ 22
4-2-2 Selecting the Shutter Speed (Flash Modes Only) ........................................................... 24
Table of Contents
■Terminology and Trademarks
■Safety Precautions ........................................................................................................................................ i
WARNING ..................................................................................................................................................i
CAUTION...................................................................................................................................................ii
■CA Prop 65 ...................................................................................................................................................... ii
■Intended Usage ........................................................................................................................................... iv
■Intended Users ............................................................................................................................................. v
■Restrictions .................................................................................................................................................... v
■Accompanying Accessories ................................................................................................................... vi

viii
4-3 Setting the Indication and Items in Measurement Screen ............................................. 26
4-3-1 Setting Target Color temperature ....................................................................................... 26
4-3-2 Customizing Display Items in the Measuring Screen ..................................................... 28
4-4 Selecting the Display Mode ................................................................................................. 30
4-4-1 Displaying in Text [Text] Mode .......................................................................................... 34
4-4-2 Displaying in Spectrum Graph [Spectrum] Mode ......................................................... 37
4-4-3 Displaying in Spectrum Comparison
[Spectrum Comp.] Mode ....................................................................................................... 39
4-4-4 Displaying in Color Rendering Index [CRI] Mode ......................................................... 43
4-4-5 Displaying in Color Rendering Index Comparison [CRI Comp.] Mode .................... 45
4-4-6 Displaying in TM-30-15 [TM-30] Mode ........................................................................... 49
4-4-7 Displaying in Spectral Similarity Index [SSI] Mode ...................................................... 51
[Standard Light Source Selection] ..................................................................................... 53
[Color Temperature Input ] ................................................................................................... 56
[Memory Recall Selection] .................................................................................................. 59
4-4-8 Displaying in TLCI or TLMF [TLCI/TLMF] Mode ........................................................... 62
4-4-9 Displaying in Filter [
Filter ] Mode ....................................................................................... 66
[Lighting Filter] ....................................................................................................................... 66
[Camera Filter] ....................................................................................................................... 70
4-4-10 Displaying to Compare Light Sources [Multi Lights] Mode ......................................... 74
4-4-11 Displaying in White Balance Correction Graph
[WB Corr.] Mode ..................................................................................................................... 80
4-4-12 Displaying Setting [Setting] Screen ................................................................................. 82
5. Measuring Light Sources [Measurement Screen] ................................................ 84
5-1 Measurement Method ........................................................................................................... 84
5-1-1 Balancing Color Temperatures of Light Sources ............................................................. 84
5-2 Measurement in Ambient Light Mode ................................................................................ 85
5-3 Measurement in Cordless Flash Mode .............................................................................. 88
5-4 Measurement in Cord (PC) Flash Mode ........................................................................... 92
5-5 Comparison Function (in Ambient Light Mode only) ....................................................... 97
5-6 When [Over], [Under], [Filter N/A] or red letter is Displayed ......................................... 99
5-6-1 Display of [Over], [Under], [Filter N/A] or red letter ......................................................... 99
5-6-2 Changing the Light Range ................................................................................................. 101

ix
6. Measurement Tool [Tool Box] Screen ......................................................................... 102
6-1 Setting Preset Contents [Preset Selection] Screen ................................................... 103
6-2 Using the Memory Function ............................................................................................... 106
6-2-1 Naming Measurement Being Memorized [Memory Title] Screen ........................... 107
6-2-2 Recalling Measurement Results [Memory Recall] Screen ....................................... 110
6-2-3 Renaming Memory Title [Memory Rename] Screen .................................................. 115
6-2-4 Deleting Saved Measurement Results [Memory Clear] Screen .............................. 118
[Erasing Individual Values] .................................................................................................120
[Erasing the Memory Title]..................................................................................................121
7. Meter Settings [Setting] Screen ....................................................................................... 123
7-1 Setting Items ......................................................................................................................... 123
7-1-1 Item List .................................................................................................................................. 125
7-2 Customize .............................................................................................................................. 126
7-2-1 Item Specications ............................................................................................................... 127
7-2-2 Selecting the Shutter Speed Step .................................................................................... 128
7-2-3 Selecting the LB Step .......................................................................................................... 131
7-2-4 Selecting the Camera Filter Brand ................................................................................... 133
7-2-5 Selecting the Lighting Filter Brand ................................................................................... 135
7-2-6 Selecting the White Balance Step .................................................................................... 137
7-2-7 Selecting the Unit of Illuminance ...................................................................................... 139
7-2-8 Selecting the Color Space（Hue/Sat）
............................................................................. 141
7-2-9 Selecting the Spectrum Y-axis Scale ............................................................................... 143
7-2-10 Selecting the Auto Power Off Time ................................................................................... 146
7-2-11 Selecting the Backlight Brightness ................................................................................... 148
7-2-12 Selecting the Auto Dimmer Time ...................................................................................... 150
7-2-13 Selecting the Language ...................................................................................................... 152
7-2-14 Reset Customized Items .................................................................................................... 154
7-3 Preset Editing ....................................................................................................................... 155
7-3-1 Displaying the Preset Selection List ................................................................................. 158
7-3-2 Setting the Present Name .................................................................................................. 160
7-3-3 Setting the Preset Target Color Temperature ................................................................. 162
7-3-4 Setting the LB Index Correction Value ............................................................................. 165
7-3-5 Setting the CC Index Correction Value ............................................................................ 167

x
7-4 Dark Calibration .................................................................................................................... 169
7-5 Product Information Display ............................................................................................... 172
7-5-1 Regulation Display ............................................................................................................... 174
8. Hardware Setting Screen .......................................................................................................... 175
8-1 Adjust Touch Panel .............................................................................................................. 177
8-2 Edit User Information .......................................................................................................... 180
8-3 Factory Setting ..................................................................................................................... 182
9. Appendix ................................................................................................................................................ 185
9-1 Glossary ................................................................................................................................. 185
9-2 Filter Types ............................................................................................................................ 188
9-3 Specications ........................................................................................................................ 193
9-4 Legal Requirement .............................................................................................................. 198
10.Optional Accessories ................................................................................................................... 199
11.Troubleshooting ............................................................................................................................... 200
12.After-sales Services ...................................................................................................................... 203

1
1. Parts Designations and Functions
1. Parts Designations and Functions
1-1 Parts Designations
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a
USB Mini-B Connector
c
Strap Eyelet
Rear View
Battery Compartment Section
Front View
1Light Receptor
2Light Selection Ring
0
Tripod Socket
3Power Button
4Display Panel
5Measuring Button
7
Memory Button
6Menu Button
8
Battery Cover Latch
9
Battery Cover
b
Sync Terminal
Bottom View
d
Battery
Compartment

2
1. Parts Designations and Functions
1-2 Parts Functions
The following table lists the functions of each part.
No. Part Name Functions
1Light Receptor Point light receptor directly at light source during reading. Head
rotates 270 degrees to aid reading.
2Light Selection
Ring
Rotate to select dark calibration, normal measuring range or high
range for ash light.
3Power Button Press to turn ON/OFF.
4Display Panel
Displays the setting screens and measuring screens. The built-
in touch panel function enables setting, selection or operation by
touching the display panel. (P16)
5Measuring Button Press for measurement.
6Menu Button Press to shift display to Display Mode Selection screen.
7Memory Button Press after measuring to save the measured data.
8Battery Cover
Latch Latch for the battery cover.
9Battery Cover Secures the batteries.
0Tripod Socket Female mounting threads (1/4-20) for hands free mounting on
tripods.
aUSB Mini-B
Connector
The USB connector for connecting to the PC with the installed
utility and USB bus power.
USB terminal: Mini-B-5pin
bSync Terminal Accepts an optional synchro cord when using meter in Cord (PC)
Flash Mode.
cStrap Eyelet Used to attach the included strap.
dBattery
Compartment Holds the batteries. Insert the batteries in the correct direction.

3
2. Before Use
2. Before Use
2-1 Attaching the Strap
1. Pass the strap (included) through the outer hole of the Strap
Eyelet c.
2. Pass the opposite end of the strap through the loop at the end of
the strap.
WARNING
Infants or toddlers may accidentally wrap the strap around their neck, so
please place it in a location out of their reach. There is a danger of suffocation.
CAUTION
●Infants or toddlers may accidentally grab the strap and swing the product,
so please place it in a location out of their reach, as the meter may be
damaged by impacts.
●Be careful that the neck strap does not come loose when carrying the
product, as the meter may be damaged when dropped.
●This neck strap is made of polyester ber.
Please refrain from using the product if synthetic bers cause your skin
to become irritated, inamed or itchy in order to prevent worsening your
symptoms.
&
Strap Eyelet c

4
2. Before Use
2-2 Installing the Batteries
1. Prepare two AA batteries.
2. Slide the Battery Cover Latch 8in the direction of the arrow and
remove the Battery Cover 9.
3. Insert the batteries according to the "+" and "-" symbols in the
Battery Compartment d.
* As shown in the diagram below, please note both positive sides of the batteries are
facing in the same direction.
4. While lining up the two tabs on the Battery Cover 9, press the
Battery Cover 9 back into place from above.
WARNING
Do not place batteries in open ames, attempt to short, disassemble, apply
heat to, or recharge them (except rechargeable batteries). They may burst and
cause res, serious injury, or damage to the environment.
CAUTION
●Use the manganese or alkaline batteries.
●Do not use batteries with any other rating than the one specied.
Also, do not mix old and new batteries.
●Please insert the batteries minus "-" side rst.
When removing the batteries, remove them plus "+" side rst.
●lf the meter will not be used for an extended period of time,
it is recommended to remove the batteries to avoid possible damage caused
by battery leaking.
TabsBattery Cover Latch 8 Battery Cover 9
Battery Compartment d

5
2. Before Use
2-3 Power ON/OFF
Power ON
1. Turn the Light Selection Ring 2to set to the
dark calibration position ( ).
2. Press the Power Button 3.
The meter will turn on and the Startup screen will be
displayed (for 2 seconds).
NOTICE
●The blue lettered "SEKONIC" logo screen is displayed
after battery replacement and 24 hours after power OFF.
●The meter is executing a memory check while the blue
progress bar is moving on the Logo Screen, so please
do not turn OFF the power, as doing so may lead to
damage.
NOTE
●If the LCD screen shows no display, check if the batteries are installed properly (Pos/Neg
positioning) and have enough capacity.
●You can reduce start up time by simply tapping the screen when the Startup screen
appears.
Logo Screen
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Power Button 3
Light Selection Ring 2
Startup Screen

6
2. Before Use
3. Select the language. (Appears only when turned ON for the rst
time)
The Language Selection screen is displayed. Select the language to use.
4. Press the [OK] to select the language.
The language can be switched at any time. (P152)
5. Dark calibration.
The C-700 series measuring system must be calibrated before use. Turn Light
Selection Ring to calibration indication. "Dark calibration in progress. Please
wait" and the status bar will appear while calibrating. The Measuring screen will
appear when operational.
NOTE
Dark calibration is performed when there is a big change in temperature between turning
power OFF and ON.
Except the cases above, dark calibration after power ON is skipped.
A blue highlight
will appear
behind the
selected button.
Language Selection
Screen
Language Selection
Conrmation Screen
Dark Calibration
Process Screen

7
2. Before Use
NOTICE
●When the Light Selection Ring 2is not set to the dark
calibration position, the message "Please set Light
Selection Ring for dark calibration." is displayed. Set the
Light Selection Ring 2to the dark calibration position
( ) to calibrate the system.
●If dark calibration is not successful, "Dark calibration
failed. Please check Light Selection Ring position." is
displayed. Set the Light Selection Ring 2to the dark
calibration position ( ) to calibrate the system.
6. Press the Measuring Button 5to measure.
Turn the Light Selection Ring 2to select the range.
When measuring ambient light, make sure to select Range L ( ).
When measuring ash units, select Range L ( ) or Range H ( )
depending on the brightness of of the ash. (P99, P101)
NOTICE
When the Measuring Button 5is pressed at the dark calibration
position, the message "Measurement failed. Please check Light
Selection Ring position." is displayed. Set the Light Selection Ring
2to the correct position and the Measuring screen will be displayed.
Dark Calibration Position
Conrmation Screen
Dark Calibration
Conrmation Screen

8
2. Before Use
NOTE
Measurements and display will take longer in light levels below 30lx. The LCD illumination
will normally switch off during measurements to avoid inuence to measurements.
Power OFF
1. Press and hold the Power Button 3for 1 second or longer.
The meter will turn OFF.
NOTICE
Please wait 3 seconds between repeated power on and power off sessions.
NOTE
All settings and measurements made during use are saved in memory even after the meter
is powered off.