● In case any of the items listed above are found to be damaged or missing, or if the printing is
unclear, plea se contact your local KYORITSU distributor.
Power adapter MODEL8329 (CAT III 150 V, CAT II 240 V)
Safety warnings
KEW8177 (10 A/ Ø40mm)
KEW8178 (10 A/ Ø68mm)
KEW5050 Ior Leakage current logger (Product) has been designed, manufactured and tested according to IEC
61010: Safety requirements for Electronic Measuring apparatus, and delivered in the best condition after
passing quality control tests. This instruction manual contains warnings and safety procedures which
have to be observed by the user to ensure safe operation of the Product and to maintain it in safe
condition. Therefore, read through these operating instructions before starting to use the Product.
WARNING
- For about instruction manual –
● Read through and understand the instructions contained in this manual before starting to use the Product.
● Keep the manual at hand to enable quick reference whenever necessary.
● The Product is to be used only in its intended applications.
● Understand and follow all the safety instructions contained in the manual.
● Read the instruction manual for clamp sensor after reading this instruction manual.
It is essential that the above instructions are adhered to. Failure to follow the above instructions may cause
injury or damage the Product, and/or damage the equipment under test. Kyoritsu assumes no responsibility
for damage and injury caused by misuse or not following the instructions in the manual.
for safe operation of the Product. It is essential to read the instructions wherever the symbol appears in the
manual.
DANGER:
WARNING:
CAUTION:
Measurement Category
To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards for various
electrical environments, categorized as O to CAT IV, and called measurement categories. Higher-numbered
categories correspond to electrical environments with greater momentary energy, so a measuring instrument
designed for CAT III environments can endure greater momentary energy than one designed for CAT II.
(None, other) : Circuits which are not directly connected to the mains power supply.
O
CAT II : Electrical circuits of equipment connected to an AC electrical outlet by a power cord.
CAT III : Primary electrical circuits of the equipment connected directly to the distribution panel, and
feeders from the distribution panel to outlets.
CAT IV : The circuit from the service drop to the service entrance, and to the power meter and primary
overcurrent protection device (distribution panel).
indicated on the Product, means that the user must refer to the related parts in the manual
is reserved for conditions and actions that are likely to cause serious or fatal injury.
is reserved for conditions and actions that can cause serious or fatal injury.
is reserved for conditions and actions that can cause injury or instrument damage.
DANGER
● The Product is to be used only in its intended applications or conditions. Otherwise, safety functions
equipped with the Product doesn’t work, and instrument damage or serious personal injury may
occur. Verify proper operation on a known source before taking action as a result of the indication of the
Product.
● With attention to the measurement category to which the object under test belongs, do not make
measurements on a circuit in which the electrical potential exceeds the following values.
* 300 V AC for CAT IV, 600 V AC for CAT III
● Do not attempt to make measurement in the presence of flammable or explosive gasses, or in steam
environment.
● Never attempt to use the Product if its surface or your hand is wet.
- Measurement -
● Do not exceed the maximum allowable input of any measuring range.
● Never open the battery compartment cover during a measurement.
● When the Product and the test lead are combined and used together, whichever lower category either of
them belongs to is applied. Confirm that the measured voltage ra ting of the te st lead is not exceeded .
● Connect voltage test leads to the Product first, and only then connect them to the circuit under test.
● Keep your fingers behind the barrier* during a measurement.
* Barrier provides protection against electrical shock and ensures the minimum required air and cr eepa ge d ist ance s.
● Never disconnect the voltage test leads from the connectors of the Product during a measurement
(while the Product is energized).
● Do not touch two lines under test with the metal tips of the test leads.
● Never touch the metal tips of the test leads.
- Clamp sensor -
● Use only the ones designed specially for the Product.
● Ensure that sensor rating is appropriate for a current to be measured; voltage rating of the circuit under
test should not exceed the maximum rated voltage.
● Ior leakage clamp sensors (KEW8177/ 8178) are rated to CAT III 300 V. The reference voltage input
terminals on the Product is rated to CAT IV 300 V, CAT III 600 V. The lower category rating is applied
when using these sensors with the Product; be careful not to exceed CAT III 300 V.
● Connect the sensors only required for the testing.
● Connect sensors to the Product first, and only then connect them to the circuit under test.
● Keep your fingers behind the barrier* during a measurement.
* Barrier provides protection against electrical shock and ensures the minimum required air and cr eepa ge d ist ance s.
● Never disconnect the sensors from the connectors of the Product during a measurement
(while the Product is energized).
● Connect to the secondary side of a circuit breaker; the primary side may have large current capacity and
may cause danger.
● Do not touch two lines under test with the metal tips of the jaw.
- Battery -
● Do not try to replace batteries during a measurement.
- AC adapter –
● Ensure that the power cord and the AC adapter are firmly connected.
● Use the power cord and the AC adapter MODEL8262 supplied with the Product.
● The AC adapter is rated to 100 V AC – 240 V AC. When using MODEL7170 power cord, ensure that it
should be connected to 125 V AC or less.
● The AC adapter frequency rating is 50/ 60Hz.
● Always check the frequency rating is not exceeded, and do not connect to a circuit in which 240 V AC or
higher electrical potentials exist. Otherwise, it may damage the AC adapter or KEW5050 and electrical
accidents may happen.
- Earth cable –
● Use the supplied earth cable and connect the Product to a well-known earth terminal. Never connect the
earth cable to a live circuit to avoid damaging the Product and prevent electrical accidents; the cable
isn’t protected against high voltage.
● Verify proper operation on a well-known source before starting to use the Product.
CAUTION
● Examine the conductor under test before starting a test. It might be hot.
● Do not apply current or voltage exceeding any measuring ranges for a long period.
● Never apply voltage or current to voltage test leads or clamp sensors while the Product is off.
● Do not use the Product at dusty places or to be spattered.
● Keep away from a strong electric magnetic field or energized object.
● Never give strong vibrations or drop shocks.
● Insert an SD card to the slot with the correct orientation. If the card is inserted up-side-down, the SD
card or the Product may be damaged.
● Do not replace or remove SD card while the Product is transferring or accessing information.
(The symbol blinks while accessing the SD card.) Otherwise, the saved data in the card may be
lost or the Product may be damaged.
- Clamp sensor -
● Do not bend or pull the cable of the clamp sensor.
- Battery -
● Brand and type of the batteries to be used should be harmonized.
- Treatment after use -
● Power off the Product and disconnect the power cord, voltage test leads and clamp sensors from
the Product.
● Remove the batteries if the Product is to be stored and will not be in use for a long period.
● Remove the SD card when carrying the Product.
● Never give strong vibrations or drop shocks when carrying the Product.
● Do not expose the Product to direct sunlight, high temperature, humidity or dew.
● Use a damp cloth with neutral detergent or water for cleaning the Product. Do not use abrasives or solvents.
● Dry and store the Product if it is wet.
Carefully read and follow the instructions: DANGER, WARNING, CAUTION and NOTE
described in each section.
Meaning of symbols on the Product:
User must refer to the explanations in the instruction manual.
Instrument with double or reinforced insulation
AC
〜
Functional earth
Crossed-out wheel bin symbol (according to WEEE Directive: 2002/96/EC)
indicating that this electrical product may not be treated as household
waste, but that it must be collected and treated separa tely.
KEW 5050 is an advanced LEAKAGE CURRENT LOGGER that is able to identify the resistive leaka ge
current Ior in various wiring systems. The Ior is the dangerous component of the leakage current because Ior
consumes power and then it can cause a rise in temperature that can lead to fire and electrical shock.
KEW 5050 can simultaneously measure and record several parameters such as: Ior resistive leakage current,
R Insulation Resistance b ased on Ior, lom and Io leakage current with and w ithou t ha rmonic co mpone nt s, Vm
and V mains voltage with and withou t ha rmonic co mpon ents, θ phase difference and F mains frequency.
KEW 5050 can measure instantaneous and even t val ues .
Wiring configuration
KEW 5050 supports single-phase 2-wire, single-phase 3-wire, three-phase 3-wire, three-phase 4-wire.
The graphic display shows how to connect the KEW 5050 to the electrical installation under test according to
the wiring configuration set. Vector diagram shown on display helps to check the correct orientation of the
clamp sensors.
Less susceptible to harmonics
Measured value is determined on basic waveform of mains frequency by a unique calculation method. Thus,
leakage current with harmonics does not affect the measured value.
* Leakage current Trms ( Iom) and reference voltage Trms (Vm) values contain harmon ics.
Measurement at pre-set interval
Easy to find intermittent leakage current since KEW 5050 will measure and record data every 200 ms with
gapless. If the selected interval is longer th an 2 00 ms, the max., min., average and in stan tane ous value s in the
selected period will be saved a t the set in terva l.
Events detection
In case KEW 5050 detects a value of current / voltage larger (or lower) than the threshold values, it will record
the value of detected current / vo ltage with da te and ti me bu t al so th e instan taneo us leakag e curren t.
Saving data
KEW 5050 has a logging function with user-selectable recording intervals. The saved data is stored in the SD
card offering possible recording time up to several y ears. The start/stop of the logging can be done by manual or
automatic operation. A useful Print Screen function allows the end use r to save display ed screens a s BMP files.
Vector diagram
Vector diagram of KEW 5050 graphically represents the phase relation between reference voltage (V) and
leakage current (Io) on its display.
Dual power supply system
KEW 5050 operates either with AC power supply or with batte ry. AA alkaline d ry-cell battery (LR6) and AA Ni-MH
rechargeable battery can both be used. * Rechargeable battery and specific charger are not supplied. If using
rechargeable battery, use the charger which is manufactured by the same company as the battery. For safety
reason, KEW 5050 does not charge rechargeable battery.
Data analysis
The saved data can be read by a P C or can be transferred to a PC via USB. Dedicated soft ware “KEW
Windows for KEW5050” allows data analysis and the setup of KEW 5050 on a PC.
Signals output
KEW 5050 has digital output signals that can activate alarm devices w hen events occur. *Alarm devices are not
supplied with KEW 5050.
Safety construction
KEW 5050 is designed to meet the International Safety Standard IEC 61010-1 CATIV 300V / CATIII 600V.
Barrier is a mechanical safety part and provides protection against electrical shock and ensures the minimum
required air and creepage distances. Keep y our finge rs and hand s behi nd the barrie r duri ng a me asure ment .
The Product is operating with battery. This icon varies in 4 steps according to the
battery power condition.
The Product is opera tin g w ith AC power supply.
Display is held.
Keys are locked.
SD card is accessible.
Recording data in the SD card.
Not enough storage space in the SD card.
Failed to access the SD card.
Stand-by state
Recording the measured values.
The SD card is full.
USB is available.
Symbols on LCD
Symbols displayed on the LCD
Leakage current (Trms) including
Iom
Vm
θ
R
A numbe r rep re senti ng CH numb er is added and di splay ed w ith abo ve sy mbol . If ju st the symbol is d ispla y ed,
without a number, it means that the value is the sum of all CHs.
19 KEW5050
harmonic components
Reference voltage (Trms)
including harmonic components
−
Phase angle
Insulation resistance
(Ref. value)
+
lagging
leading
Indicates phase angle of leakage current Trms (Io), basic wave by regarding
phase angle of reference voltage Trms (V), basic wave, as 0.0°.
Shows insulation resistance values determined by the following formula.
Note:
Displayed value is just for reference since the measurement method differs
from insulation resistance testers and may not be consistent with each other.
In general, insulation monitoring devices measure le akage current (Io) and detect deterioration of insulation;
however, the measured leakage current usually includes resistive leakage current (Ior) – potential causes of fire,
electrical shock or power loss - and capacitiv e leakage current (Ioc) – usually not dangerous. Therefore, to
diagnose insulation deterioration accurately on an electrical installation with large Ioc (e.g. installation with long
wiring or with inverter devices) is difficult.
Example:
Io on single-phase 2-wire
Vector: Io = Ior + Ioc
Ior and voltage (V) flow in the same phase (no phase difference) and they can be converted to active power as
follows.
Active power (P) = V x Ior x cos0° (cos0°= 1) = V × Ior
It means that Ior consumes power and then it can cause a rise in temperature that can lead to fire and electrical
shock.
<Why Ioc is not usually dangerou s? >
On the other hand, Ioc leads the phase to voltage by 90° and can be converted to active power as follows.
Active power (P) = V x Ior x cos90° (cos90°= 0) = 0
The consumed Power of Ioc will be zero and then it can be ignored as no dangerous situations usually occur.
Ioc
Io
Ior
V
Leakage current (Io) measurement
To determine Io, harmonics are removed from the basic wave of leakage current (1st order of nomibal power
frequency 50/ 60 Hz) using Fast Fourier transform (FFT).
Io = Io_kr
Where:
_kr: real number component after FFT,
_ki: imaginary number component after FFT, and
k = 1: FFT analysis order (1st order)
4.2 Resistive leakage current (Ior) measurement KEW5050
Resistive leakage current (Ior) measurement
Single-phase 2-wire
To find Ior only, we determine active power (P) using Io and real and imaginary numbers of Trms reference
voltage (V) at first, and then remove V.
P_k = V_kr×Io_kr+V_ki×Io_ki
_
Io_ki
V = Io_kr
Ior =
Where:
_kr: real number component after FFT, _ki: imaginary number component after FFT, and
k = 1: FFT analysis order (1st order)
Single-phase 3-wire
Where:
Ior_L1 and Ior_L2 represent resistive leakage current in L1 and L2 phase, and Ioc_L1 and Ioc_L2 represent
capacitive leakage current in L1 and L2 phase respectively.
Theoretically if insulation deterioration occurs in L1 and L2 phase simultaneously and in the same value, Ior is
canceled because the voltage across L1 and L2 is always in opposite phase. But practically this is a ve ry ra re
case; therefore, it is possible to test and judge the phase with relevant degraded insulation. The vector direction
of Io helps to identify the phase with relevant degraded insulation. To find Ior only, we determine active power
(P) using Io and real and imaginary numbers of Trms reference voltage (V) at first, and then remove V.
P_k = V_kr×Io_kr + V_ki×Io_ki
_
Io_ki
V = Io_kr
Ior =
Where:
_kr: real number component after FFT, _ki: imaginary number component after FFT, and
KEW5050 4.2 Resistive leakage current (Ior) measurement
Three-phase 3-wire
In the above illustration, Ior_R and Ior_T represent resistive leakage current in R and T phase, and Ioc_R and
Ioc_T represent capacitive leakage current in R and T phase respectively.
First, find reactive power Q using Io and real and imaginary numbers of Trms reference voltage (V), and then
remove V to find a reference value. Ior flows in the same phase as voltages flow in R and T phases. When
Ioc_R and Ioc_T are balanced, Ioc flows in the reverse direction against V. The above figure shows relationship
of each component in the form of vector. Use the following formula to find Ior.
Q_k = V_kr×Io_ki+V_ki×Io_kr
√
_
Io_ki
V = Io_kr
Ior =
Where:
_kr: real number component after FFT, _ki: imaginary number component after FFT, and
k = 1: FFT analysis order (1st order)
The vector direction of Io helps to identify the phase with relevant degraded insulation.
Note: When a vector of Io is between the vectors of Ioc_R and Io c_T, the relationship of current magnitude w ill
be Ior≧Io≧(Q/ V). If Ioc_R and Ioc_T are unbalanced, measurement error occurs.
Ioc
T
Q/V
Io
Ioc_
Ioc_T
Ior_T
S
R
Ior = Ior_T + Ior_R
Ior_R
V
Three-phase 4-wire
In the following illustration, Ior_R, Ior_S and Ior_T represent resistive leakage current in R, S and T phase, and
Ioc_R, Ioc_S and Ioc_T represent capacitive leakage current in R, S and T phase respectively.
When Ioc in each phase are balanced, the total lea kage current w ill be ze ro and can be ign ored . In th is case , Io
and Ior are equal.
The vector direction of Io helps to identify the phase with relevant degraded insulation.
Ior measurement on wiring with different capacities
Phases of Ior and Ioc may overlap when testing Delta, Op en Del ta/ V-connection three-phase sy stem s w ith
different capacitie s. In su ch ca se s, r emo vin g Ioc from Io is impossible; therefore, Ior cannot be accurately
measured. Leakage current doesn’t flow on the flowing power supply (not connected to earth ground) such as
IT system; so also in this case Ior cannot be measured.
5. Getting started
Attaching markers to clamp sensors
Attach the color markers to clamp sensors for easy recognition. Colors of the marker are harmonized with that of
current input terminals (red: A1, yellow: A2, blue: A3, green: A4). Supplied markers are 8 pcs in total (red, blue,
yellow, green: 2 pcs each).
Color marker Attach to both ends of the sensor cable.
(2 pcs in each 4-color: 8 pcs)
Power supply
The Product operates with either AC power supply or battery. Capable of performing measurements in the event
of AC power interruption, power to the Product is automatically restored by the batteries installed in the Product.
Battery
AA alkaline dry-cell battery (LR6) or AA Ni-MH battery can both be used. To charge rechargeable battery, use
the charger which is manufactured by the same company as the battery. The Product cannot charge batteries.
* Size AA alkaline dry-cell batteries (LR6) are supplied as accessories.
DANGER
● Do not try to replace batteries during a measurement.
● Never touch the connector of AC adapter while the Product is operating with batteries.
WARNING
● Ensure that the power cord, voltage test leads and clamp sensors are removed from the Product, and that
the Product is switched off when opening the battery compartment cover for battery replacement.
● Brand and type of the batteries to be used should be harmonized.
● Never mix new and old batteries.
● Install batteries in correct polarity as marked inside the battery compartment area.
Note
Batteries are not installed in the Product at the time of purchase. Please insert the supplied batteries
before starting to use the Product. Battery power is consumed even if the Product is being off. Remove
all the batteries if the Product is to be stored and will not be in use for a long period.
How to install batteries
Screw
2
5
Battery compartment co ver 2 5
1
Disconnect AC adapter, earth cable, voltage test leads and clamp sensors from the Product, and
power off the Product.
2 Loosen two battery compartment cover-fixing screws and remove the cover.
3 Take out all the batteries.
4 Insert six batteries (size AA alkaline battery: LR6) in correct polarity.
5 Install the battery compartment cover and fix it with two screws.
The battery indicator icon va rie s ac cordin g to t he bat tery co ndi tion ; the icon chan ge s to AC power icon when
the Product is connected to AC power.
Powered by AC
Power supply icon
Powered by
battery
Possible continuous measurement hours:
- approx. 11 hours with size AA alkaline batteries, and
Remaining battery power
- approx. 9 hours with size AA Ni-MH (1900mA/h), fully
charged batteries.
Note:
as the battery to charge rechargeable battery.
Rechargeable batteries cannot be charged in the Product.
Enough for normal operation
*These status indicators may appear when using ful lycharged Ni-MH battery since the voltage of the battery
is lower than that of alkaline battery.
Displayed in 4-level
Use the charger manufactured by the same company
Too low: Measurement continues, but data save stops.
(A measurement in progress is saved until it ends.)
For a long period of logging, use the supplied AC adapter . It i s recommended to install batteries even while
connecting the Product to mains outlet. Power to the Product is automatically restored by the installed
batteries in the event of unexpected power interruption. The following tables show the ratings of AC adapter
and power cord.
Always check the followings before plugging/unplug ging the AC adapter.
MODEL7170 Power cord
Rated supply voltage 125 V AC
Rated supply current 7 A max
MODEL8262 AC adapter
Rated supply voltage 100 – 240 V AC (±10%)
Rated supply freq. 50/ 60Hz
Max power consumption20 VA max.
DANGER
● Use only the AC adapter and the power cord supplied w ith this Produ ct.
● Never connect MODEL7170 power cord to a pow er supp ly of gre ater than 125 V AC.
● Ensure that the rating suits the power supply voltage and the frequency to be used. Do not connect the AC
adapter to a power supply great er than 240 V AC (50/ 60Hz) otherwise it may damage th e adapter or the
Product and cause electrical accident.
●Connect the supplied earth cable to a well-known earth terminal to earth the Product. Ne ver conne ct
the earth cable to a live wire to avoid damaging the Product or to prevent electrical accident since the cable
is not protected against high voltage.
WARNING
● Power off the Product and connect the power cord.
● Connect the power cord to the Product first, and then to an outlet. The cord shou ld be firml y connected .
● Never attempt to make measurement if any abnormal conditions are noted, such as cracks or exposed metal
parts.
● Disconnect the power cord from the ou tlet when the Product is not in use.
● When unplugging the power cord fro m th e outle t, do so by removing the plug first and no t by pulling the co rd.
Note
●Always connect the supplied earth cable when using the AC adapter and make measurements to
stabilize the readings.
● Use of AC adap te r to su pply pow er to the Produ ct can conserve ba ttery li fe.
●The Product shuts off in the event of sudden power interruption and data may be lost if no batteries are
Follow the procedure below and connec t the AC adapter to the Product.
1 Confirm that the Product is powered off.
2 Firmly connect the power cord to the AC adapter.
3 Connect the output terminal of the AC adapter to the female connector of the earth cable.
4 Firmly connect the connection terminal of earth cable to the AC adapter connector on the Product.
*
Direct connection of AC adap ter to the Product – insert the output terminal of AC adapter to the connector
for AC adapter on the Prod uct – is allow ed where the Produ ct is connected to a PC for data a nalysis and
performs no measurements.
5 Connect the clip of the earth cable to a well-known earth terminal.
6 Connect the power cord to an outlet.
Clip of earth cable
5
DANGER:
connected is surely the ear th term inal.
Never connect to a live conductor.
Connection terminal
Always check and confirm the terminal to be
1 KEW5050
3
Output terminal of
AC adapter
4
Connection terminal of
Earth cable
2 Power cord
AC adapter 2
The Product can derive power from a measurement line of 240 V or less to ground by using an optional power
adapter, MODEL8329. For further detail, see “9.3 Getting power from measured line” (P. 78).
● Follow the instructions described below and insert the SD card into the slot with the correct orientation.
Inserting the card with incorrect orientation may damage the card itself or the Product.
● Do not replace or remove the SD card while accessing to the card; otherwise, the saved data in the card
may be lost or the Product may be damaged. The symbol blinks while accessing to the card.
● Do not remove the SD card while symbol is blinking, otherwise the saved data or the Product
may be damaged. Before removing the card, stop recording and confirm that the LCD shows “Recording
stopped.”.
Note
● Use the SD card supplied with the Product or the one supplied as optional parts.
● Newly purchased SD card must be formatted on the Product before use. Data might not be successfully
saved on an SD card formatted on a PC. For the details, please refer to “Format” (P .58) in this manual.
● If the SD card has been frequently used for a long period, the flash memory may be exhausted and further
data may not be saved on it. In such a case, please use another new card.
● The data in the SD card might be damaged or lost by accident or failure. It is recommended to back up the
recorded data periodically. Kyoritsu will not be liable fo r any loss of data or any other dam age s or losses.
Inserting SD card
1 Open the connector cover.
2 Insert the SD card into the SD card slot with the topside turned up.
3 Close the cover. Do not leave the cover open unless it is necessary to do so.
Removing SD card
1 Open the connector cover.
2 Gently push the SD card towards inside, and then the card comes out.
3 Remove the card slowly .
4 Close the cover. Do not leave the cover open unless it is necessary to do so.
5.4 Voltage test lead and Clamp sensor connection KEW5050
Voltage test lead and Clamp sensor connection
Check the following before connecting the test leads and sensors.
DANGER
● Use only the voltage test leads supplied with the Product.
● Use the clamp sensors designed for the Product. Ensure that the rating of the sensors suits the measurement
current.
● Connect the clamp sensors only required for a measurement.
● Connect the test leads and sensors to the Product first, and only then connect them to the circuit under test.
● Never disconnect the test leads and sensors during a measurement - while the Product is supplied from the
measurement line.
WARNING
● Confirm that the Product is powered off, and then connect voltage test leads and clamp sensors.
● Connect the test leads and sensors firmly to the Product first and then to the object to be tested.
● Never attempt to make measuremen t if any abn ormal cond ition s a re no ted, su ch as crac ks or exposed metal
parts.
Follow the procedure below, and connect the voltage test leads and clamp sensors.
1 Confirm that the Product is powered off.
2 Connect a voltage test lead to the reference voltage input terminal on the Product.
3 Connect the necessary clamp sensors to the current input terminal on the Product. Match the direction of
the arrow mark on the output terminal of the clamp sensor and the mark on the current input terminal on
the Product.
Number of clamp sensors to be used varies depending on the wiring configuration under test. See “Wiring
diagrams” (P.37) in this manual.
The key doesn’t turn off the Product while symbol stays on the LCD; key lock function is enabled.
Hold down key at least 2 sec. and confirm symbol disappears, and then hold down key
2 sec. or longer to turn off the Product.
Hold down
least 2 sec.
1 Model name and software version will be displayed upon powering on the Product. Stop using the
Product if it does not get started properly, and refer to “11. Troubleshooting” (P. 89) in this manual.
2 A screen to show measured value s app ears fo llow ed by the start-up scree n.
key until the following screen is displayed. To power off the Product, hold down key at
Model name
Version info.
Serial No.
Cautionary message
If the connected clamp sensors are not the same ones us ed at the previous test, the LCD shows the sens ors
currently connected, serial no. and phase correction values five sec. Correct the displayed information if it doesn’t
conform to the present connection. Press to move to “Basic setting”.
Note:
When using general purpose leakage clamp sensor or load current clamp sensor, manual configuration
is required. Press to move to “Basic setting”.
Read the following precautions prior to making connection.
DANGER
● The voltage to ground rating of the Product is 300 V AC for CAT IV and 600 V AC for CAT III max. Do not
make measurements on a circuit in which the higher electrical potentials exist.
● Use the voltage test leads and clamp sensors designed specially for the Product.
● The voltage to ground rating of the supplied clamp sensors is 300 V AC for CAT III max. The rating differs
from the one of reference voltage input term inal on the Prod uct. Always check and confirm that the rating
suits the measurement voltage.
● Connect the clamp sensors, voltage test leads and power cord to the Product first, and then connect to the
object to be measured or the power source.
● When the Product and the test lead are combined and used together, whichever lower category either of
them belongs to will be applied. Confirm that the voltage rating of the test lead is not exceeded.
● Do not connect unneccesary voltage test leads or clamp sensors to the Product.
● Clamp sensors should always be connected on the downstream side of a circuit breaker, which is safer than
the upstream side.
● Do not open-circuit the secondary side of a supplementary CT while it is energized; otherwise, high voltage
will be generated at the secondary side te rminal .
● Be careful to avoid short-circuiting the power line with the un-insulated part of the voltage test leads. Do not
touch the tip metal part.
● Transformer jaw tips are designed in such a way to avoid short-circuiting; however, extra care should be
taken to minimize the possibility of shorting when measuring un-insulated conductors.
● Keep your fingers behind the barrie r during a measuremen t.
Barrier provides protection against electrical shock and ensures the minimum required air and creepage
*
distances.
● Never disconnect test leads or sensors from the connectors on the Product during a measur ement (while
the Product is energized).
● Do not touch two lines unde r test w ith the me tal tip s w hen op ening the jaw s.
WARNING
● To avoid possible electric shock and short-circuit, always turn off the measurement line under test at
connection.
● Do not touch the un-insulated tip of voltage test leads.
Press to show the wiring diagram corresponding to the curr ent settings. Use to toggle the
types of wiring system and to change the number of system. Connect the necessary clamp sensors
and voltage test leads according to the displayed wiring diagram, and then press to move to “Basic
setting” screen to reflect the selection. The selection won’t be reflected by pressing .
Note:
●Always connect voltage test le ads ev en w hen measu ring cu rren t only to cal cula te the me asured va lu es at
proper timing and stabilize the readings.
● Phases of Ior and Ioc may overlap when testing Delta, Open Delt a/ V-connection three-phase s ystems wit h
different capacities. In such cases, removing Ioc from Io is impossibl e; therefore, Ior cannot b e accurately
measured. Leakage current does n’t flow on the fl owing po wer supply (n ot connected to earth gr ound) such
as IT system; so also in this case Ior cannot be measured.
For accurate measurement
● Confirm that the configuration of wiring system suits the measurement line.
● Ensure that the arrow mark on the clamp sensor points towards load side (towards neutral at earth line
measurement).
When measuring earth line/ A (Load curren t) X 1 - 4 1P2W (Single-phase 2-wire) X 1 - 4
: clamp onto L and N lin es
Neutral/ Load
Load
Power source
Arrow mark:
Neutral/ Load side
Arrow mark: Load side
Power source
1P3W (Single-phase 3-wire) X 1 - 4: clamp on to L1, L2 an d N 3P4W (Three-phase 4-wire) X 1 - 4:
3P3W (Three-phase 3-wire) X 1 - 4 : clamp onto R, S and T clamp onto L1, L2, L3 and N
The LCD shows the currently applied recording settings before a start of recording. Select
with the displayed settings. To change the settings, select
Always check and follow the safety precautions and do proper preparation before starting measurement.
: Move the highlight to
How to stop recording
Press .
Cancel/ Start
to start recording
Start
and press to change the settings.
Cancel
Confirm Cancel
Data number
Recording method
Events to be
recorded
Data No. Data no. of the recorded data. It is also used as a folder name to save data.
Elapsed time The time that elapsed while recording.
Manual Shows recording start date and time.
Recording method
REC Event Events to be recorded and comp ared with criteria of judgement.
Move the highlight to
KEW5050 38
Constant Shows recording start/ stop date and time.
Before starting a measurement, make settings for measurement conditions and data saving.
Press and show the wiring diagram screen first. Select an appropriate diagram and press
to proceed with detail settings. Press or to return to the previous screen.
Moving the highlighted cursor
Basically, is to move the highlighted cursor, is to confirm the change/ selection, is to
return to the previous settings. The following example shows how to make settings for current clamp sensors.
The other input operations are basically the same.
The item with white text with black background indicates the item currently selected.
In this example, press
to confirm the selection. Press
If the display of the selectable items is like the one shown to the left, the highlighted
cursor can move to up, down, right and left. Use
to be connected, and then press to confirm. To return to the previous scree n
and cancel the changes, press the
To alter the numbers such as serial no., date and time, move the highlighted cursor
with keys and alter the number with keys. In the example shown
to the left, the hundreds place of serial no. is being selected. The number can be
increased or decreased by 1 with
or press
key to return to the previous screen without making changes.
to move the highlight to select a clamp for each CH and
Auto-configuration works only for Ior leakage clamp sensor
Connect Ior leakage clamp sensor(s) to the Product and perform sensor detection. Type of the sensor, serial
no. and phase correction value are automatically updated. If the connected sensors are not the same ones
used at the previous test, “!” symbol is displayed to the left of the CH number.
Manual configuration is required for general purpose leakage clamp sensor or load current clamp sensor; the
settings aren’t updated automatically.
KEW5050 automatically identifie s Io r leakag e cl a mp senso rs only. Manual
configuration is required w hen using gene ra l purpo se le akage cl amp sen sor or
load current clamp sensor.
- Current clamp sensors are firmly connected to the Product?
- If any failure is in doubt:
Disconnect the sensor, for which "NG" is given and connect to the different CH
on which another sensor is prop erly detected. If the result "NG" is given for the
same CH, a defect of the Product is suspected. A defect of sensor itself is
suspected if "NG" is given for the sam e sensor. Stop using the Product and the
sensor, if any defects are in doubt.
Current clamp sensor/ ch
Follow the procedure below and make detailed settings for current clamp sensor.
Select the model name of the sensor t o be used. When locating the hi ghlighted cursor to any of the l isted
clamp sensors, rate current and conductor size information are displayed for easy recognition.
● When “AUTO” is set, event detection on the subjected CH is automatically set to “OFF”. Select a fixed
range to enable the event detection fun ction .
Leakage current clamp sensors used for a measurement can be searched on the application by registering
a serial no. of the sensor beforehand.
Ior leakage clamp sensor
Serial no. is automatically registered when connected to the Product and do sensor detection, or power
on the Product or start recording. The serial numbers, which have already been registered, are
selectable from the list. The registered serial no. cannot be cleared.
General purpose leakage clamp sensor
First, select “New” and then enter the number labeled on the sensor. The entered number is selectable
from the list. After entering the number, the currently selected number (serial no. of currently selected
general purpose leakage clamp sensor) can be cleared; move down the highlight to “Delete serial number”.
Load current clamp sensor
Cannot enter serial number of load current clamp sensor. No entry window opens.
Choose the nominal frequency of the system to be measur ed. If vol tage freq uen cy is unce rtain; fo r exampl e,
in the event of power interruption, the Product performs measurements based on the preset nominal frequency.
Selection
50Hz/ 60Hz
*
: default setting
Move the highlight to “
Select a frequency.
Event setting
Nominal f
”
Confirm/
Show the pull-down menu.
Cancel
Use to move to “Event” tab.
Common settings to all events
Hysteresis:
Set a desired hysteresis in percentage to disable the event detection in the specific area. Setting a proper
hysteresis will be helpful to prevent unnecessary detection of events which are caused by voltage or current
fluctuations around the threshold values.
The following shows how to set upper threshold values.
Choose an item.
Selection
RMS leakage current (rms) :Iom
RMS reference voltage :Vm
Upper TH (H):
Leakage current :Io
Resistive leakage current :Ior
Reference voltage :V
Trigger:
Choose and set “ON” to enter threshol d value for each ev ent. The event with “ON” setting is applie d to all
CHs. To disable event detection on a certain CH, set the Curr ent range to “AUTO” or adjust the threshold
value for the subjected CH.
Note
● While Current range setting has been set to “AUTO”, “ON” cannot be set for current-related event. Choose
an appropriate current range, and then select “ON”.
Set the upper Trms threshold value, which is determined at ever y 200 ms, to the m ax val ue of each ra nge.
For this threshold value, the pre-set hysteresis value is applied.
Note
● Upper threshold values for T rms leakage current is set in percentage against each current range; therefore,
current value for the threshold value c hanges if Current range settings are c hanged. Reference voltage
range is fixed to 1000V.
Selection
0 - 100% against voltage range (100%)
0 - 11 0% again st cu rren t range (1 00%)
*
: default setting
Move the highlight to a desired CH.
* A pop-up appears and show the effective range.
Show the value entry window .*
Enter values. Confirm/ Cancel
Detection example: * Trms values measured at every 200ms (50 /60Hz: 10 /12- cycle )
Set the lower threshold value of reference v oltage, which is d etermined at e very 200 ms, to th e max value
(1000V) of the range. For this threshold value, the pre-set hysteresis value is applied.
Selection
0 - 100% against the range (5%)
*
: default setting
Move the highlight to the event item.
Show the value entry window.*
* A pop-up appears and show the effective range with Trms value.
Enter a percentage against max value of the range.
Detection example: * Trms values measu red a t every 200 ms (5 0/60H z: 10/12 -cycle )
The following shows how to set peak threshold values.
Choose an item.
Selection
Peak TH (Pk):
Trms leakage current :Iom
Trms reference voltage :Vm
Trigger:
Choose and set “ON” to enter threshol d value for each ev ent. The event with “ON” setting is applie d to all
CHs. To disable event detection on a certain CH, set the Curr ent range to “AUTO” or adjust the threshold
value for the subjected CH.
Note
● While Current range setting has been set to “AUTO”, “ON” cannot be set for current-related event. Choose
an appropriate fixed current range, and then select “ON”.
Measured data will be recorded at th e preset interval fo r the specified time pe riod of the selected period . When
the specified time comes, a recording will start and stop automatically; such a recording cycle will be repeated
every day during the specifie d pe ri od.
Selection
REC Period Start-StopDay/ Month/ Year (DD/ MM/ YYYY) - Day/ Month/ Year (DD/ MM/ YYYY)
REC Time Start-StopHour:Minute (hh:mm) - Hour:Minute(hh:mm)
Move the highlight to “
Confirm/ Cancel
Specify the time.
When the period and time are specified as below, the Product records the results from 6:10 am to 8:30 am
every day from May 20, 2017 through June 10, 2017. In th e time other than sp ecified abo ve, no recor ding
is performed.
● Use the SD card supplied with the Product o r the one suppli ed as option al pa rts.
● Newly purchased SD cards must be formatted on t he Product b efore use. Dat a might not be s uccessful ly
saved on SD card formatted on a PC. For the details, please refer to “Format” (P. 58) in this manual.
● Remaining recording time length varie s depending on the volume of recorded e vents. Event data up to 1GB
can be saved on the SD card per recording.
The following table show s possible recording time leng th when using a 2GB SD. (No event re cording.) These
are just reference values since measurement con ditions or environment affect the pos sible recording time
length. When setting the interval to 400 ms not only instantaneous valu e but also average, max, and min
values are recorded; thus, possible recording time becomes shorter than the one with 200 ms interval setting.
Select and delete unnecessary files. Select a file with refer ence to the d ate info displ ayed to the ri ght of the
file name. Files are listed in random order. Each prefix of file name indicates the type of the data: S0001 –
9999 for measurement data, PS-SD000 – 999 for screenshot and SUPS0000 – 9999 for KEW5050 settings.
The scroll bar is displayed when the list of the recorded data exceeds the display area.
Check box Scroll bar
Move the highlight and select a file to delete. Check the box.
Confirmation message appears. Select Yes/ No.
Confirm/ Close the list and returns to “Saved data” screen.
When pressing
the file is being selected. Multiple files can be selected at once.
and select a file to delete, the corresponding checkbox is checked to indicate
-
/ Uncheck
-
”Format”
Format the SD card. Formatting is to comp le tely era ses al l data on the card . The scroll bar is displayed when
the list of the recorded data exceeds the display area.
Scroll bar
Confirmation message appears. Select Yes/ No.
Confirm/ Close the list and return to “Saved data” screen.
Save KEW5050 setting data, SUPS0000 – 9999, on the SD card. Data is listed in random order. The scroll
bar is displayed when the list of the recorded data exceeds the display area.
Scroll bar
Confirmation message appears. Select Y es/ No.
Confirm/ Close the list and return to “Saved data” screen.
Read KEW5050 setting data, SUPS0000 – 9999, from the SD card. Data is listed in random order. Select a
desired file with reference to the date information displayed to the right of the file name. The scroll bar is displayed
when the list of the recorded d ata exceed s th e display a rea.
Scroll bar
Select a file to transfer. Confirmation message appears. Select Yes/ No.
Confirm/ Close the list and returns to “Saved data” screen.
T ypes of saved data
Data file handling
The file name will be assigned automatically. File no. is kept and saved, even after powering off the Product,
until the system is reset. The file number will increase until it exceeds the max file number.
Note
● If a file with the same file name already exists on the SD card, the files in the data folder will be saved as
another name with a different file number; however, “print screen” and “KEW5050 setting” files will be
overwritten in such a case. Attention should be paid so as not to duplicate the same file names after system
reset (file number starts from “0”) or when one same SD is used for multiple KEW5050 units. When all the
file numbers (S0000 – S9999) are used for each type of data, the files on the data folder will be overwritten.
● The Product cannot handle the files or folders which are delete d, renamed or saved on a PC; moreover,
such files or folders cannot be analyzed with the special software. Please do not change the name of folder
or file.
Assign an ID number for the unit. Assigning ID numbers will be helpful when usin g multiple units at the same
time, measuring multiple systems periodically with one unit and analyzing the recorded data.
Selection
00-001 to 99-999
*
: default setting
Move the highlight to “
Enter an ID number.
ID Number
”.
Show the value entry window.
Confirm/
Cancel
“Buzzer”
Mute the keypad sound. This setting doesn’t affect a waning buzzer for low battery power.
Selection
On/ Off
*
: default setting
Move the highlight to “
Confirm/ Cancel
”. Show the pull-down menu.
Buzzer
Select On/ Off.
“Auto power off”
Select to enable or disable the auto-power-off function. While the Product is operating with batteries,
“Disable” cannot be set to save battery life.
For: Selection
AC Power 5 min./ Disable
Battery 2 min. (fix)
*
: default setting
Move the highlight to “
Select to disable/ enable auto-power-of f. Confirm/ Cancel
Select to turn off/ not to turn off the backlight automatically when a certain time passes after the last key operation.
While the Product is operating with batteries, “Disable” cannot be set to save battery life.
For: Selectio n
AC Power 5 min./ Disable
Battery 2 min. (fix)
*
: default setting
Move the highlight to “
Select to disable/ enable auto-off.
Backlight off
”.
Show the pull-down menu.
Confirm/ Cancel
“System reset”
Restore all the settings to default except for “Language”, “Date format” and “Time”.
Measured values per system is displayed on one screen. If measurements are done on multiple systems, the
result of entire system is displayed first.
List display
Example: 3P3W (Three-phase 3-wire, 1-system)
* On a wiring system of 3P3W, Ior is bigger than Io if Io flows in the phase between R and T phase voltages.
* The number following alphabets indicates the system number.
Symbols displayed on the LCD
Io
Iom
R
V
leakage current with basic wave of
Trms
50/ 60Hz only
leakage current including harmonic
Trms
components
Insulation resistance
V: Reference voltage (
Note:
resistance testers and may not be consistent with each other
Trms
wave of 50/ 60Hz only
is determined by
Trms
, basic wave)/ Ior: Leakage current (
Displayed value is just for reference since the measurement method differs from insulation
reference voltage (Trms) with basic
Ior
f
leakage current with resistive
Trms
components only
Frequency of reference voltage
Trms
, resistive components)
“Switching the displayed systems”
Press to toggle the screen to view the measurements on each system.
Vector diagram for each system is displayed on one screen.
V ector diagram
Example: 3P3W (Three-phase 3-wire)
Solid line “V” () Vector of reference voltage basic waveform
Solid line”Io” () Vector of Trms leakage current
(basic waveform)
Dotted line () Other voltage except for reference voltage
basic waveform
Arc θ ( ) Phase angle
* The number following alphabets indicates the system number.
Symbols displayed on the LCD
Trms leakage current including harmonic
Iom
components
θ Phase angle
* vector line indicating Ior phase angle
0 to +180
0 to -180
leading
lagging
Phase angle of the basic wave of leakage current: phase
angle of the basic wave of reference voltage is regarded as 0°.
Vm
Trms
reference voltage
components
including harmonic
Vector diagrams will be as follows where there are no resistive c apacitance components, and volta ge and
current are balanced. If the phase of Io is outside of the following range, orientation of clamp sensor or polarity
of alligator clip may be incorre ct.
Press to toggle the screens to view the measurements on each system.
”Showing measured values on each system”
Press to show the measured values.
Displaying measured values of entire system
Measured values of entire system are summed and displayed on one screen. This screen doesn’t appear
when the system to be measured is just one; only one screen (LOAD 1) is available. The number following
alphabets indicates the system numb er; the symb ol wit hout numb er indic ates the d ispl ayed value i s the sum
of all systems.
List display
Example: 3P3W (Three-phase 3-wire, 4-system)
* On a wiring system of 3P3W, Ior is bigger than Io if Io flows in the phase between R and T phase voltages.
Trms leakage current with resistive
components only
Frequency of reference voltage
Io
Iom
R
V
* The number following alphabets indicates the system number.
Symbols displayed on the LCD
Trms leakage current with basic wave of
50/ 60Hz only
Trms leakage current including harmonic
components
Insulation resistance is determined by
V: Reference voltage (Trms, basic wave)/ Ior: Leakage current (Trms, resistive components)
Ior
Note: Displayed value is just for reference since the measurement method differs from insulation
resistance testers and may not be consistent with each other.
Trms reference vo ltage w ith ba sic wave
of 50/ 60Hz only
Ch (system) no. Ch (system 1 – 4) on which events are detected.
Dat e of occurrence Date when the start/ end of event isdetected.
Time of
occurrence
Measured value
Indicates how many times the event occu rred. When an even t occu rred, the number
increases by 1, and increase one more a t the e nd of even t; that is, in creases by 2 in
total.
Time when the star t/ end of ev ent is de te cted.
Instantaneous values when the start/ end of event is detected. Measured values of a long-
lasting event can be checked with the interval measurement data. Setting a short interval
(200ms is the shortest interval) at event recording is recommended for better analysis.
Each event is detected based on Trms values measured in approx. 200ms, gapless. When an event is detected,
the beginning of the 200ms period where the event detected is regarded as the start time of the event. If further
event is not detected in the following 20 0ms periods; the begi nning of the wavefo rm is regarded as th e end of the
event. The detected event is assumed to be continued between the start to the end of event detection.
Example of event detection (biggest event)
Trms values in continuous 200ms (50/60Hz: 10/ 12-cycle) periods
Current/ voltage
waveform
Threshold value
waveform
Trms
Trms ①
Trms ②
~~~
①
②
Start
Trms ③
~
Hysteresis
③
End
Duration
Example of event detection (smallest event)
*
Trms values in continuous 200ms (50/60Hz: 10/ 12-cycle) periods
Peak values are checked every 200ms, while monitoring waveforms of Trms leakage current and reference
voltage at approx. 40ksps, gapless. The beginning of the 200ms period where the first peak event is detected is
regarded as the start of the event. If further peak events are not detected in the following 200ms periods; the
beginning of the waveform is regarded as the end of the event. The detected event is assumed to be continued
between the start to the end of event detection .
Example of peak event detection
Measured
waveform
Start
Approx. 200ms
Duration
Threshold value
End
Saved data
When an event occurs, type of the occurred event, ch(system), start/ end time and measured values are recorded.
Display is held anytime by pressing . The LCD shows to indicate the data hold function is
enabled. Another press of releases the held indicati on and disa ppears. The screens can be
switched to check each measured value while the display is being held, and measur ed values and event
information are continuously recorded.
Key lock
Press 2 sec. or longer. The LCD shows and all keys are disabled. Another press of
2 sec. or longer releases the locked keys and disappears.
Note
● The button doesn’t work while the key lock function is enabled. T o pow er off the Product, press 2 sec. or longer and turn off .
Backlight Auto-off
While operating with AC power source:
The LCD backlight is turned off automatica lly 5 min after the last k ey operation. Press any k ey except for
Power key to turn on the light again. To disable the Backlight auto-off function, press and go t o
“Others”, “KEW5050 setting”, “Backlight” and select “Disable”.
While operating with battery:
The backlight is automatically turned off 2 min after the last key operation. Press any key except for the
Power Key to turn on the backlight aga in. The backlight doesn’t stay on while the Product is operating with
batteries.
Auto-power-off
While operating with AC power source:
The LCD backlight is turned off automatica lly 5 min after the last k ey operation. Press any k ey except for
Power key to turn on the light again. To disable the Backlight auto-off function, press and go t o
“Others”, “KEW5050 setting”, “Power” and select “Disable”.
While operating with battery:
The backlight is automatically turned off 2 min after the last key operation. Press any key except for the
Power key to turn on the backlight again. The backlight do esn’t stay on while the Pro duct is oper ating with
batteries.
Current range of each sensor is switched automatically according to the measured Trms currents. This autoranging function doesn’t work at event recoding. A range shifts to one upper range when the input exceeds
300%peak of each range and shifts to one lower range when the input drops under 100% Trms of each range.
Sensor detection
Press to go to “Basic” tab, and move the highlight to “Detect” under [Clamp] to detect the connected
clamp sensors automatically. The Product automatically detects the connected sensors when it gets started
and notifies only when the con nected sen sors are different from the ones used in the previous test.
Print screen
Press
to save the currently displayed screen as a BMP (bitmap) file. * File size: approx. 77KB
Retaining settings
All the settings have been saved and ke pt in the Product and not be cleared on t he time of power-off. The
product adopts the same settings used at the previous test when powering on again. * Default values will be
displayed for the first time after purchase.
Status indicator
The green LED blinks while the Product is in stand-by mode and stays on during recording.
Data in the SD card can be transferred t o PC via USB or SD card reader. (supporting USB mass storage)
KEW5050 is connected as a removable disk.
Notes:
● The PC doesn’t recognize the SD card in the Product during a recording to prevent the measurement data.
● The Product isn’t compatible with all kinds of dev ic es. The Product m a y not wor k pr op er ly if it is c on necte d
to a PC via a USB hub.
● Installing the supplied USB driver i s esse ntia l even when u sing USB ma ss storage mode .
* It is recommended to use SD card to transfer data to PC. (Transfer time: approx. 320MB/ hour) It takes longer
time to transfer large data by use of SD card since transferring large data files by USB requires more time than
using the SD card reader. As to the manipulation of SD cards, please refer to the instruction manual attached
to the card. Ensure that the SD card contains only the data files meas ured with the Product to save data
properly.
● The digital output terminal L is earthed via earth cable where the Product is earthed with the eart h cable;
therefore, voltage applied to the digital output terminal L should be equal to earth voltage. It may
damage the Product or cause serious electrical accident. Max rated voltage to ground for digital output terminal H is 30 V, 50 mA, 200 mW or less.
Connectable wire size
Suitable wire : single-wire Φ1.2 (AWG16), twisted wire 1.25mm2 (AWG16), strand size Φ0.18mm or more
Usable wire : single-wire Φ0.4 - 1.2 (AWG26 - 16), twisted wire 0.2 - 1.25mm
strand size Φ 0.18mm or more
Standard length of bare wire: 11 mm
1 Open the Connector cover.
2 Press the rectangular protrusion above a terminal with a flat-blade screw driver, and insert a signal wire.
3 Remove the driver and fix the wire.
2
(AWG24 - 16),
Digital output terminal
Output format : Open collector output
H terminal: Internal pull-up resistor of 10 kΩ, 5 V
Allowable input is up to 30 V, 50 mA, 200 mW.
L terminal: Earthed via ea rth cable .
Signal wire
Flat-blade screwdriver
Digital output terminal
+5V
H
OUTPUT
L
KEW5050 78
The circuit of H and L terminal is open collector output t ype as illustrated to the
left. The L terminal is earthed via the earth cable; the H terminal has a pull-up
resistor of 10 kΩ to control voltage to 5 V for a conne ctio n w ith ex tern al de vice .
The output of H terminal is usually 5 V. The H terminal is connected to L terminal
while events are lasting; that is, voltage across the terminals is 0 V. If the
duration of an event is less than 1 sec., voltage across the te rminals will be 0
for 1 sec. The same situation occurs when mul tiple events occur and overlap at
the same time. To limit the target events, please refer to: 6.3 Eve nt setting (P.
When it is difficult to use an AC adapter to get power from an outle t, use MODEL8329 (power ad apter) instead
to derive power through voltage test leads.
DANGER
● The power adapter, test lead and the Product belong to different measurement categories respectively.
The power adapter is rated to the lowest category; do not connect to a circuit on which earth voltage
exceeding 150 V AC in CAT III or 240 V in CAT II exists.
● MODEL 8329 Power adapter is rated to 50 Hz/ 60 Hz.
● Connect voltage test lead to the Product first, and only then connect i t to th e measu rement lin e .
● Never disconnect the voltage test lead from the connector of the Product during a measurement (while the
Product is energized).
● Connect to the downstream si de of a circui t breaker si nce a current capacity at the upstream side is large.
WARNING
● Never attempt to make measurement if any abnormal cond itions are noted, such as a broken cover and
exposed metal parts.
● Power off the Product before connecting the adapter and test leads.
● Firmly connect voltage test leads to the Product first.
Follow the procedures below to connect the adapter.
1 Ensure that KEW5050 and MODEL8329 are both powered off.
2 Connect voltage test leads to power input terminals (N/ L) on MODEL8329,
and then the plugs of MODEL8329 to the reference voltage input terminals on
KEW5050.
3 Firmly connect the power plug of MODEL8329 to AC adapter.
4 Connect the output terminal of AC adapter to the female connector of earth cable.
5 Firmly connect the connection terminal of the earth cable to the AC adapter
connector on the Product.
6 Connect the clip of earth cable to
DANGER
other than earth terminal. Never connect to a live wire.
7 Connect the alligator clip of voltage test lead to the
circuit under test.
8 Power on KEW5050.
9 Power on MODEL8329.
Reversed procedure is appli ed to remove the Adap ter from
the Product. Read through MODEL8329 instruction
manual as well.
well-known earth terminal
Always check so as not to connecting the clip
:
7
240 V
or less
.
4
2
1 / 9
2
MODEL8329
Measurement category: CAT III 150 V CAT II 240 V (50/ 60 Hz)
Fuse rating: 500 mA / 600 V AC, Fast acting type Ø 6.3 × 32 mm
KEW5050 10. PC software for setting and data analysis
10. PC software for setting and data analysis
The special software “KEW Windows fo r KEW5050” al low s da ta analy sis* and the setup o f KEW5050 on a PC .
* Automati c gene ration o f graphs and lists ba sed on the reco rded data by just one click. Da ta managemen t of
different settings for multiple KEW5050 units and recorded data.
Please refer to the installation manual for “KEW Windows for KEW5050” and install the application and
USB driver in your PC.
● Interface
Communication method: USB Ver2.0
USB communication using a special software “KEW Windows for
KEW5050” allows:
* Downloading files downloading files in the SD card to a PC,
* Making settings for the Product via a PC,
* Displaying the measured results on a PC in graphic form
● System Requirements
・OS(Operation System)
For the supported OS, please check the version label on the CD case or visit our website.
・Display
1024 × 768 dots, 65536 colors or more
・HDD (Hard-disk space required)
1Gbyte or more (including Framework)
・.NET Framework 3.5
・.NET Framework 4.6
● Trademark
・Windows® is a registered trademark of Microso ft in the Uni t ed Sta tes.
The latest software is available for download from our homepage.
Location for use : In door use, Altitude up to 2000m
Temp. & Hum. range : 23°C±5°C, Relative humidity 85% or less (no condensation)
(guaranteed accuracy)
Operating Temp. & Hum. range : -10ºC to 50 ºC, Relative humidity 85% or less (no condensation)
Storage Temp. & Hum. range : -20ºC to 60ºC, Relative humidity 85% or less (no condensation)
Withstand voltage :
5160 V AC/ 5 sec. Between Reference voltage input terminal and Enclosure
3310 V AC/ 5 sec. Between Referen ce voltage input termi nal and Current input terminal , Connector for AC
adapter, Communication (USB) connector.
Insulation resistance : 50 MΩ or more/ 1000 V , between Voltage/ Current input terminal, Connector
for AC adapter and Enclosure
Applicable standards : IEC 61010-1, -2-030
Measurement category
Main unit: CAT IV 300 V CAT III 600 V , Pollution degree 2
Voltage test leads: CAT IV 600 V CAT III 1 kV, Pollution degree 2
IEC 61010-031, IEC61326 Class A
Dust/ water-proof : IEC 60529 IP40
There is time lag in display update (400 ms max) due to arithmetic processing; however, no time lag between the
recorded data and the time stamp.
Backlight OFF: Automatically turns off in 2 min (when working with battery)/ in 5 min (working w ith
ON: Turn on by pressing any key other than power key.
Dimension : 165(L) × 115(W) × 57(D) mm
Weight : approx. 680g (including batteries)
Accuracy : within ±5 sec/ day
Power source : MODEL8262 AC ad apte r
Voltage range 100 V AC – 240 V AC
Frequency 50 Hz/ 60 Hz (Allowable range: 47 Hz – 63 H z)
Power consumption 7.5 VA max
: DC power source
Dry cell battery Rechargeable battery
Voltage
Battery Size AA Alkaline (LR6) Size AA Ni-MH (1900mA/h)
Current consumption 0.21 A typ.(@4.5 V) 0.26 A typ.(@3.6 V)
Battery life
Ior leakage clamp sensor 10 A type Ø40mm)
Ior leakage clamp sensor 10 A type Ø68mm)
Leakage clamp sensor 10 A type Ø24mm)
Leakage clamp sensor 10 A type Ø40mm)
Leakage clamp sensor 10 A type Ø68mm)
Leakage clamp sensor 1 A type Ø24mm)
Leakage clamp sensor 1 A type Ø40mm)
Leakage clamp sensor 1 A type Ø68mm)
Clamp sensor 50 A type Ø24mm)
Clamp sensor 100 A type Ø24mm)
Clamp sensor 100 A type Ø24mm)
Clamp sensor 200 A type Ø40mm)
Clamp sensor 500 A type Ø40mm)
Clamp sensor 500 A type Ø40mm)
Clamp sensor 1000 A type Ø55mm)
Clamp sensor 1000 A type Ø68mm)
Flexible sensor 1000 A type Ø110mm)
Flexible sensor 3000 A type Ø150mm)
MODEL8329 Power adapter (CAT III 150 V, CAT II 240 V)
External communication: via USB * USB cable length should be 2m or less.
Connector mini-B
Communication method USB Ver2.0
USB identification no. Vendor ID: 12EC (Hex), Product ID: 5050 (Hex), Serial no.: 0 +7-digit individual no.
Communication speed 12Mbps (full-speed)
Digital output terminal:
The circuit of H and L terminal is open collector output type. The L terminal is earthed via the earth cable; the
H terminal has a pull-up resistor of 10 kΩ to control voltage to 5 V f or a conn ection with extern al device. The
H terminal is connected to L terminal while events are lasting; t hat is, voltage across terminals i s 0 V. If the
duration of an event is less than 1 sec., voltage across terminal s will be 0 for 1 sec. The same situa tion occur s
when multiple events occur and overlap at the same time.
Connector Through hole Screwless terminal block, 2-pole (ML800-S1H-2P)
Output format Open collector output, 0 V between terminal H and L, acti ve
Input voltage 0 – 30 V, 50 mA max, 200 mWmax
Voltage across terminals
Rated input
H terminal
L terminal
While detecting events: 0 V – 1 V
Stand-by mode: 4 V – 5 V (inside pull-up resistor 10 kΩ, 5 V)
Max. voltage-to-ground: 30 V, 50 mA, 200 mW
* Earthed via earth cable.
Measurement specification
Frequency f 〔Hz〕
Measurement method : Reciprocal method; calculating reciprocal numbers of accumulated counts in 10 cycle (50 Hz)/ 12-cycle (12-cycle).
Displayed digit 3-digit
Accuracy ±2dgt *where reference voltage is sine wave 40 - 70Hz and 10 V Trms or higher.
Display area 10.0 - 99.9 Hz (Bar (“----“) indication outside of this range)
Signal source Reference voltage
Measurement item and the number of analysis points
Computed with 8192-point data while regarding 200ms(50Hz:10-cycle, 60Hz:12-cycle) as one measurement area.
Trms leakage current (Iom), T rms reference voltage (Vm)
Computed with 4096-point data while regarding 200ms(50Hz:10-cycle, 60Hz:12-cycle) as one measurement area.
Leakage current (Io), Reference voltage (V), Resistive leakage current (Ior), Phase angle (θ), Insulation resistance (R)
Measured in 40.96ksps
Instantaneous peak leakage current (IomP), Instantaneous peak reference voltage (VmP)
Measurement method :40.96ksps (every 24.4μs), gapless, calculate Trms values every 200ms.
Effective frequency range : 40 – 70 Hz
Trms leakage current (Leakage clamp sensor)
Trms load current (Load current clamp sensor)
Iom [A T rms]
Range
Display digit Leakage clamp sensor: 5-digit
Effective input range 1% - 110% (Trms) of each range, and 200% (peak) of the range
Display range 0.15% - 130% (display “0” for less than 0.15%, “OL” if the range is exceeded)
Crest factor 3 or less
Accuracy ±0.2%rdg±0.2%f.s. + clamp sensor amplitude accuracy
0.9 V - 1100.0 V Trms (display “0” for less than 0.9 V, “OL” if the range is exceeded)
2 or less
−=1
Vm
n
⎛
⎛
1
⎜
=
⎜
n
⎝
⎜
⎝
∑
i
0
()
⎞
⎞
2
⎟
iV
⎟
⎟
⎠
⎠
www.GlobalTestSupply.com
11.3 Measurement specification KEW5050
t
θθθ
Items to be calculated
Measurement system : Digital PLL synchronization
Measurement method : Calculation with a basic wave after harmonics analysis
Effective frequency range : 40 - 70Hz
Window width : 10-cycle at 50Hz, 12-cycle at 60Hz
Window type : Rectangular
Data analysis : 4096 points
Analyzing rate : Once/ 200ms at 50Hz/60Hz, gapless
Range The same as Trms leakage/ load current
Display digit The same as Trms leakage/ load current
Effective input range
Display range The same as Trms leakage/ load current
Meas. method Analysis window width is 10/12-cycle against 50/60Hz, measurement values are
Accuracy
*
Equation
2, 3
The same as Trms leakage/ load current
calculated by basic wave only.
±0.2%rdg±0.2%f.s.+ clamp sensor amplitude accuracy
* for reference voltages with sine wave 40 – 70 Hz and 90 V Trms or higher
()
()
()
22
()
1010ikrkcIoIoIo+=
Reference voltage V [T rms]
Range The same as Trms reference voltage
Display digit The same as Trms reference voltage
Effective input rangeThe same as Trms reference voltage
Display range The same as Trms reference voltage
Meas. method
Accuracy
*
Equation
Phase difference of reference voltage, current θ〔deg〕
Display digit 4-digi
Display range 0.0° to ±180.0° (regarding the phase of reference voltage as 0.0°)
Meas. method Analysis window width is 10/12-cycle against 50/60Hz, measurement values are
Accuracy Within ±0.5° for the inputs of 10% or higher of leakage current range, sine wave 40 -
Equation
2, 3
*
3
Analysis window width is 10/12-cycle against 50/60Hz, measurement values are
calculated by basic wave only.
The same as Trms reference voltage
()
()
Leading: 0 to +180°, lagging: 0 to -180°
calculated by basic wave only.
70 Hz, reference voltage of 90 V Trms or higher ,
Within ±1.0° when using Ior leakage clamp sensor, and
Within ±0.5°+ clamp sensor accura cy w hen using gene ra l purpo se cl a mp se nsor.
Range The same as Trms leakage/ load current
Display digit The same as Trms leakage/ load current
Effective input range The same as T rms leakage/ load current
Display range
Meas. method Analysis window width is 1 0/12-cycle against 50/60Hz, measurement values are
Accuracy
Note:
Accuracy isn’t
specified for general
purpose leakage
clamp sensor.
Equation
1P2W
1P3W
*
2, 3
The same as Trms leakage/ load current
* not displayed when using load current cla mp se nsor s.
calculated by basic wave only.
For reference voltages of sine wave 40 – 70 Hz and 90 V Trms or higher ,
±0.2%rdg±0.2%f.s. + clamp sensor amplitude accuracy + error of phase accuracy*
(phase error)
* add ±2.0%rdg to measured Io va lue when u sing Io r leakag e cl a mp se nsor.
(θ: within the accuracy of reference voltage/ current phase difference ±1.0°)
Calculation example:
When using KEW8178 and measuring Ior = 1mA, Io=5mA on 10mA range;
±0.2%rdg±0.2%f.s.±1.0%rdg (amplitude accuracy of KEW8178)
+Io×±2.0%rdg (clamp sensor phase error: ±1.0°)
= 1mA (Ior)×±0.2%+10mA (Ior_f.s.)×±0.2%+1mA (Ior)×±1.0%+5mA (Io)×±2.0%
= ±0.002mA±0.02mA±0.01mA±0.1mA
= ±0.132mA
±0.132mA/ 1mA( Ior)= ±0.132; therefore, Ior accuracy against 1 mA is ±13.2%rdg.
××
IoVIoV
ikikrkrk10101010
Ior
()()()()
+
=
3P3W
Ior
32
()()()()
×=
IoVIoV
××−
rkikikrk10101010
3
3P4W Sum of balanced static capacitive leakage current (Ioc) is zero.
k=1: 1st order of harmonic wave (basic wave) r: real numb er componen t afte r FFT,
2
i: imaginary number component after FFT
Measurement cycle in the equation is 10-cycle; replace “10k” with “12k” if a measurement cycle is 12.
20.00MΩ
4-digit
* not displayed when using load current clamp sensors.
0.15% - 130% of the range (“0” is displayed if less than 0.15%, “OL” if the range is
exceeded.)
Bar (“----“) is displayed where reference voltage/ leakage current is “0” or “OL”.
Upper limit of T rms values H: Iom / H: Io / H: Ior[A Trms] / H: Vm / H: V[V Trms]
Lower limit of T rms values L: VmL/ L: V[V Trms]
Meas. method
Range
Display digit
Effective input range
Display range
Crest factor
Accuracy
Input impedance
Instantaneous peak leakage current Pk:Iom[A peak]
Meas. method Check and detect event occurrence in approx. 40.96ksps (every 24.4μs), gapless
Range The same as Trms leakage/ load current
Display digit The same as Trms leakage/ load current
Effective input range 0.15% of each range (1mA<) - 200% (peak)
Display range 0.15% of each range (1mA<) - 200% (peak)
Accuracy
Input impedance Approx. 1 MΩ
Threshold value Specify the peak current in absolute value.
The same as each measurement item
The same as each measurement item
The same as each measurement item
The same as each measurement item
The same as each measurement item
The same as each measurement item
The same as each measurement item
The same as each measurement item
Based on 100% (DC) of each range.
x 1/ 10/ 100 ranges : ±0.5%f.s. + clamp sensor amplitude accuracy
x 1000 range : ±5.0%f.s. + clamp sensor amplitude accuracy
* In case of Ior leakage clamp sensor,
x 1: 10A / x 10: 1000mA/ x 100: 100mA/ x 1000: 10mA
Instantaneous peak reference voltage Pk:Vm〔V peak〕
Meas. method Check and detect event occurrence in approx. 40.96ksps (every 24.4μs), gapless
Range The same as Trms reference voltage
Display digit The same as Trms reference voltage
Effective input range 50 V – 2000 V (peak)
Display range 50 V – 2000 V (peak)
Accuracy ±0.5%f.s. *based on 1000V DC
Input impedance Approx. 4 MΩ
Threshold value Specify the peak voltage in absolute value.
When any defect or failure of the Produ ct is suspected, check the follo wing points first. If your problem is not
listed in this section, contact your local Kyoritsu distributor.
Symptom Chec k
Cannot power on the Product.
(Nothing is displayed on the
LCD.)
Cannot power off the Product. ● Key lock function is turned off?
Any key doesn’t work. ● Key lock function is turned off?
The LCD doesn’t indicate “0” at
the time of no load.
When operating with an AC power supply:
● Power cord is firmly connected to an outlet?
● Output terminal of AC adapter and earth cable is properly connected
to the Product?
● No break in Power cord, AC adapter output cable or earth cable?
● Supply voltage is within the allowable range?
When operating with batteries:
● Batteries are installed with observing correct polarity?
● Fully-charged size AA Ni-HM batteries are installed?, or
● Size AA Alkaline batteries are not exhausted?
If the problem not solved yet:
● Disconnect the AC adapter and remove all batteries from the
Product. Insert the batteries again and connect the AC adapter, and
power on the Product. If the Product still does not turn on, failure of
the Product itself may be suspected.
● When the display update doesn’t work, disconnect the AC adapter
and remove all batteries. Connect the ad apter and insta ll ba tteri es
again, and power on the Product. If the Product still doesn’t work
properly, failure of the Product itself may be su spected .
● Check the effective keys on each range.
● Some digits may be displayed while;
- reference input voltage terminals are open,
- no sensors are connected to current input terminals, or
- clamp sensors are connected to the Product, but not clamping onto
a measured conductor.
In any of above cases, there’s no influence on measurements.
LCD doesn’t show the
measured values. Readings
are unstable or inaccurate.
Cannot save data on the SD
card, or read the saved data
in the card.
Cannot download data or
make settings via USB
communication.
SD card is not detected by
PC. (USB connection)
● Voltage test leads are connected properly? Connecting the voltage
test leads are required, even when measuring current on ly, to get
stable readings.
● The orientation of clamp sensor is correct?
● The Product needs to be earthed w hen usin g AC adapte r. Prop erly
earth the Product with the supplied earth cable.
● Frequency of the reference voltage is within the allowable range: 40 –
70 Hz?
● Setting of the Product and the selected wiring configuration are
appropriate for the measured line?
● The sensor setting is harmonized with the sensor in use? Manual
configuration is required for general purpose clamp sensor.
● No break in voltage test leads or failure of clamp sensor?
● Noise interference on input signal?
● Strong electric magnetic field does no t exist i n proxim ity?
● Measurement environment meets the specification of the Product?
● SD card is insert ed co rre ctly ?
● SD card supplied with the Produ ct or suppl ied as option al pa rts is
used? Proper operation is not guaranteed if any other card is used.
● SD card has been formatted on the Produ ct? Formatting on any other
devices may reduce spac e or ma ke the da ta un rea dable .
● Is there available free space in a SD card?
● Verify the proper operation of SD card on other well-known hardware.
● PC and the Product is properly connected with the supplied USB
cable?
● Run the communication application software “KEW Windows for
KEW5050” and check the connected devices are displayed or not.
If no device is displayed, USB driver mi ght no t be in stall ed co rrec tly.
Please refer to the installation manual for “KEW Window s fo r
KEW5050” and re-install the USB driver.
● The SD card in the Produ ct isn’t detected by the PC during a re cording
in order to protect the measured data.
● USB driver might not be installed correc tly. Please refer to the
installation manual for “KEW Windows for KEW5050” and re-install
the USB driver.
Input and display items vary depe nding on th e setti ng.
Check
Cannot enter/ delete serial no.● These functions are available with general leakage clamp sensor
only . Refer to “Serial No.” (P. 44) in this manual.
Cannot set event detection to
“ON”.
● Current range for clamp sensor is set to other than “AUTO”?
When “AUTO” is set, event detection is automatically set to off on the
CH. Select a fixed range, event th reshold is included, to en able event
detection and set “ON” to event detection.
For further detail, see “Upper threshold value (H)/ ch” (P. 46) and
“Peak threshold value (Pk)/ch” (P . 50) for detail.
Error messages and actions
Error message may appear on the LCD while using the Product. Please check the following table, if any error
message appears, and take actions.
Message Detail & Action
Cannot start recording.
Please check the SD card.
Cannot save data.
Check the SD card.
No SD cards.
Out of SD card space.
Recording will be stopped.
Not having free space on the SD
card. Format the card or delete
unnecessary files.
● Confirm that the SD card is inserted correctly.
● If any problem on the SD card is suspected, please refer to:
“12.1 General troubleshooting” (P. 89) – “Cannot save data
on the SD card, or read the saved data in the card.”
● Backup the files to a PC and delete them or format the card,
or use another SD card formatted on the Product only after
stop recording and confirm the message “Recording
stopped.” disappears. See”Recorded data” (P.57) for detail.
● Check the free space on the SD card. If the space is not
enough, backup and delete the files or format the card, or use
another card. The SD card should be formatted on KEW5050,
Connected sensor doesn't match the
settings on the unit.
Check the connection.
The connected sensor differs from
previous one.
Check settings.
Sensor connection is incorrect.
Check the connection.
Start time is set in the past. Check
the recording start method.
Cannot change instrument settings
during recording or in stand-by
mode.
Event detection is disabled on AUTO
range.
● The connected clamp sensor(s) differs from the one(s) used
during the previous test.
● KEW5050 automatically identify Ior clamp sensor only. Manual
setting is required to use general purpose leakage clamp
sensor. Make settings from: , “Basic tab”, [Clamp].
● Confirm that current clamp sensor(s) is(are ) firmly connected to.
● If any failure is in doubt:
Disconnect the sensor , fo r which "N G" i s given and connect to
the CH on which another sensor is properly detected. If the
result "NG" is given for the same CH , a de fect of the Produ ct is
suspected. A defect of sensor itself is suspec ted i f "NG" is give n
for the same sensor. Stop using the Product and the sensor, if
any defects are in doubt.
● REC Start is set to either “Constant.” or “Time period.” and the
time set for “REC End” is set to the past. Check and modify
the time and date. See “Recording setting” (P.53).
● Setting change is no t all ow ed du ri ng a re cord ing . To ch ange
the settings, stop recording and confirm “Recording stopped.”
message appears and then disappears.
● When “AUTO” is set to A range for clamp sensor, event
detection on the subjected CH is automatically set to “OFF”.
Select a fixed range, event threshold value is included, to
enable event detection function.