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DRAWING No. KP1 01-1410 2040 6010

[1] SAFETY PRECAUTIONS

     Before use, read the following safety precautions.

Thank you for purchasing our voltage tester equipped with the electric 

field detection facility model KP1.

 

Before use, please read this manual thoroughly to ensure correct 

and safe use.  After reading it, keep it together with the product for 

reference to it when necessary.

Using the product in a manner not specified in this manual may cause 

damage to the protection function of the product.

The instructions given under the headings of “ WARNING” and 

“ CAUTION” must be followed to prevent accidental burn and 

electric shock.

1-1

  

Explanation of warning symbols

The meanings of the symbols used in this manual and attached to the 

product are as follows:

 

: Very important instructions for safe use.

• The warning messages are intended to prevent accidents to 

operating personnel such as burn and electric shock.

• The caution messages are intended to prevent incorrect 

handling which may damage the product.

 

 : Refer to Instruction Manual before use
 : Double or reinforced insulation 

 : Ground

 : Circuit continuity buzzer 

 

 : Backlight

1-2  Warning instructions for safe use

[2] APPLICATIONS AND FEATURES
2-1  Applications

This instrument is a voltage tester of the RMS value response type 

equipped with the electric field detection facility. It is designed for 

measurements in the ranges specified by IEC 61010-1 CAT. IV 600 V 

and CAT. III 1000 V.
Recent multiinstruments have been increasing the facilities and 

becoming capable of measuring a larger variety of items in simpler 

ways. Nevertheless, this trend also means that the risk of operation 

mistake is increasing because of the presence of facilities that are not 

required by all of the users.
This instrument has been designed to meet the actual needs of the fields 

of electrical equipment maintenance by prioritizing the usage without 

operation mistakes, reducing the size for higher portability and limiting 

the facilities to voltage measurement and electric field detection while 

complying with safety standards. It is suitable for voltage measurement 

and electric field detection of low-voltage lines and equipment.

2-2  Features

•  Safe use with low-voltage equipment – IEC61010 CAT

.

 IV 600 V 

and CAT. III 1000 V compatibility.

•  Single-button system – Easy operation for preventing operation 

mistakes.

•  Auto identification of AC or DC voltage – AC measurement in true 

RMS value.

• Easy identification of 24 V type FA control panel voltage – The 

backlight color changes at 20 V or more.

• Auto hold – The result of the last measurement is held 

automatically.

•  Self-test  – Checking failures of the LCD or disconnection of a  

lead wire.

•  AC electric field detection – Both contact and noncontact 

methods are available.

•  Designed to fit the chest pocket of the working uniform.

•  LED light for illuminating the working site.

Measurement Category (Overvoltage Category)

 Measurement Category II (CAT. II):

 

Line on the primary side of equipment with power cord to be 

connected to the receptacle.

Measurement Category III (CAT. III):

 

Line from the primary side or branch of equipment which directly 

takes in electricity from a distribution board to the receptacle.

Measurement Category IV (CAT. IV): 

Line from the service conductor to the distribution board.

[3] NAME OF COMPONENT UNITS
3-1  Main unit and test leads

3-2  Display

Data Hold

DC Voltage

AC Voltage

Low battery 

indication

Live wire alarm

Minus sign

Numeric value 

and decimal 

point

[4] DESCRIPTION OF FUNCTIONS
4-1  Changing the measuring probe angle

T h e   a n g l e   o f   t h e  

measuring probe can 

b e   c h a n g e d   b y 

removing it from the 

main body, positioning 

it in the desired angle 

and inserting it straight 

into the main body.

Be sure to insert the 

measuring probe all 

the way until it is fixed.

4-2  Power/Select button

The function of the Power/Select button varies depending on the period 

it is pressed. In this manual, we use the term “push” for the action of 

pressing the button temporarily and the term “hold” for the action of 

pressing and holding the button for more than one second.
Hold this button to turn the instrument ON/OFF. Note that the instrument 

cannot be turned OFF while it is accepting an input.
Push the button while the instrument is ON to switch the measurement 

modes.
The instrument is in the self-test mode (

displayed) when it is 

turned ON. Thereafter, each press of this button switches the modes 

in the following cycle. (For the description of each mode, see [5] 

MEASUREMENT PROCEDURE.)
Auto-identifying voltage measurement mode (

 displayed) 

 

EF mode (

 displayed) 

 Auto-identifying voltage measurement 

mode 

… (repeat)

4-3  Auto power OFF

When the instrument is left without input for about one minute since the 

last operation, Auto power OFF turns automatically the display and the 

power of the instrument OFF. To recover from the auto power OFF, hold 

the Power/Select button for more than one second.

4-4  Low battery alarm

When the built-in batteries have been discharged and the battery voltage 

has dropped to below about 2.5 V, 

 mark appears on the display. 

When this mark appears, replace both of the two batteries with new ones.
If the battery voltage drops below about 2.2 V, 

 appears on the 

LCD and the instrument becomes unable to continue measurement.

4-5  Backlight and LED light

The LCD green backlight and the LED light light when the instrument 

is turned ON. The backlight color changes to orange when the input 

is AC or DC and 20 V or more, or when the AC live wire is detected in 

the EF mode.
* The light cannot be turned OFF except by turning the instrument OFF.

4-6  Self-test

This self-test checks disconnection of the test lead wires, lack of 

display segments and failure of the buzzer and buzzer LED light.
For details, see 5-2 Self-test mode.

4-7  AC/DC auto-identifying voltage measurement

When an input of 5 V or more is applied in the self-test or auto-identifying 

voltage measurement mode, the instrument automatically identifies 

whether the input is an AC or DC voltage and displays the measured value.

4-8  Auto hold

When the probe is separated from the measurement target during 

auto-identifying voltage measurement or when the input drops below 

about 5 V, the instrument automatically holds the last measurement 

value displayed on the LCD. During auto hold, 

 appears on the 

LCD and the displayed value flashes.
* A numeric value other than the measured value may appear momentarily 

before the held value is displayed, but this is not malfunction.

4-9  EF (Electric Field) detection: EF button

This EF detection identifies the presence of voltage in a simple 

manner by detecting an electric field generated by an AC voltage

.

 

For details, see 5-4 EF (Electric Field) detection.

4-10  AC detection method

This instrument employs the RMS (Root-Mean-Square) method and 

indicates the magnitude of AC current as the same amount of work as 

DC. RMS values of sinusoidal waves and such non-sinusoidal waves 

as square and chopping waves can be measured by the true RMS 

circuit. (The input signal measurement value is used as the scale of the 

actual input signal power so it is therefore measured as a more 

effective value than the value obtained by average detection

.

)

4-11  CF (Crest Factor)

The CF (Crest Factor) indicates the peak value of a signal divided by 

its RMS value. With most common waveforms such as sinusoidal and 

chopping waves, the CF is relatively low.
With waveforms similar to pulse trains with low duty cycle, the CF is high. 

For the voltages and CFs of typical waveforms, see the table below.
The CR of measurements should be 2 or less.

Voltages of Various Waveforms

4-12  Storage of lead

[5] MEASURING PROCEDURE

1. Do not apply an input signal exceeding the maximum rated input value.

2. During measurement, do not hold the instrument by a position on the 

test pin side of the barrier on the test probe.

3. Use test leads matching the measurement category of the measured 

point.

WARNING

KP1

VOLT TESTER

Dempa Bldg

.

, 4-4 Sotokanda 2-Chome 

Chiyoda-ku, Tokyo, Japan

01-1410 2040 6010

INSTRUCTION MANUAL

This manual emplys soy ink.

  8.  Never use the instrument when it is wet or with wet hands.

  9.  Never attempt repair or modification, except for battery 

replacement.

10.  Perform start-up inspection and inspect the instrument at least 

once a year.

11.  This instrument is for indoor use only.

12. Do not use the instrument in a method other than specified. 

Otherwise, the protection function may be spoiled.

  1. Accurate measurement may be impossible near a source of 

strong magnetic field such as a transformer or large-current 

line, near a source of electromagnetic wave such as a wireless 

device or near a charged object.

  2. This instrument may malfunction or the measurement result 

may become abnormal if this instrument is used with a special 

waveform such as that of an inverter circuit.

CAUTION

TL-36: Test lead (black), approx. 1.5 m

TL-35: Test probe (red)

TL-A01: Test probe (black)

Barrier

Φ4  

plug

Φ4  

plug

Test pins

Test pins

Barrier

Barrier

Φ4  

plug

The following instructions are intended to prevent injury such as burn 

and electric shock. Be sure to follow them when using the instrument:

1. This instrument is a voltage tester equipped with the electric 

field detection facility. Do not use it with an electric circuit 

exceeding 1000 V.

 

2.  Voltages over DC 70 V or AC 33 V rms  (46.7 V peak) are 

hazardous to human body.  Take care so as not to touch them.

3.  Never input signals exceeding the maximum rated input value 

(see 1-3).

4. Never use the instrument for measuring a line connected to 

equipment that may generate induced or surge voltage (such 

as a motor) because an input exceeding the maximum 

allowable overload input may be applied.

5. Never use the instrument if the instrument or test leads are 

damaged or broken.

  6.  Never use the instrument with the case or battery lid removed.

  7.  During measurement, do not hold the instrument by a position 

on the test pin side of the barrier on the test probe.

WARNING

1-3  Overload protection

Mode

Display

Max. rated input

Max. overload 

protection input

Self-test

AC/ DC 1000 V

1050 V rms, 
1450 V peak

Auto-identifying 

voltage measurement
Electric field detection

Strap hole

Lead holder

Lead hook

Lead holder: After winding the lead 

around the lead reel for storage, 

tuck the remaining section of the 

lead in this space to prevent 

spontaneous unwinding.

Lead hook: Hook the lead on these 

parts when the lead is used 

without unwinding fully.

Strap hole: Use this hole when attaching 

a strap or like to the instrument.

Input Waveform  0 to PEAK 

Vrms

Average

Value 

Crest

Factor

Form

Factor

Root Mean 

Square Value 

Vavg Vp/Vrms Vrms/Vavg

Sinusoidal

wave 

Square

wave

Chopping

wave

Pulse

=1.414 =1.111

Vp

Vp

Vp

1

0

0

p   p

Vp

Vp

0

Vp

 

 

 

Vp

2

 

=0.707 Vp

2

 

Vp

π 

=0.637 Vp

2

√ 

Vp

- 

2

√ 

2

π 

2π 

π 

π 

Vp

Vp

1

π 

2π 

2π 

Vp

3

 

=0.577 Vp

 

Vp

2

=0.5 Vp

- 

2

3

√ 

=1.155

3

√ 

=1.732

2π 

τ 

0

Vp

 

τ

 

2π 

 Vp

 

τ

 

2π 

 Vp

- 

2π 

τ 

- 

2π 

τ 

Vp

VOLT TESTER

Probe holder

Strap hole

Magnet 

Lead reel

Lead holder

Buzzer LED

Test probe

Backlit LCD

Power/Select button

Detachable 

probe

Lead hook

EF detection antenna

Front

Back

LED light

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