Warranty
CT6841, CT6843
CT6841-05, CT6843-05
AC/DC CURRENT PROBE
Instruction Manual
Oct. 2018 Revised edition 4
CT6841A981-04 18-10H
EN
Cable
Lock lever
LOCKED : Locks the clamping mechanism.
UNLOCKED : Unlocks the clamping
mechanism.
Current direction
indicator
Front
Bottom
Clamp
Zero-adjustment
knob (0 ADJ)
Demagnetization button
(DEMAG)
Clamp lever
Center
Output connector
(model CT6841-05, CT6843-05)
Magnified figure of the
zero-adjustment knob
Notch
Output connector
(With lock function)
Host instrument
3390, 3390-10,
9555-10,
9602 (3193-10),
3334-10
8971 (MR8847,
MR8827, MR8740)
8940 (8860-50)
PW6001, PW3390,
CT9555, CT9556,
CT9557
CT9901
9705
9318
CT9900
9318
CT6841-05
or
CT6843-05
CT6841
or
CT6843
Cannot be directly connected to any parenthesized models. A module is required.
Refer to “Combined accuracy and conditions” specified in the specifications.
Warranty malfunctions occurring under conditions of normal use
in conformity with the Instruction Manual and Product Precautionary Markings will be repaired free of charge. This warranty
is valid for a period of three (3) years from the date of purchase.
Please contact the distributor from which you purchased the
product for further information on warranty provisions.
Introduction
Thank you for purchasing the HIOKI Model CT6841, CT6841-05,
CT6843 and CT6843-05 AC/DC Current Probe. To obtain maxi-
mum performance from the device, please read this manual
first, and keep it handy for future reference.
Inspection
When you receive the device, inspect it carefully to ensure that
no damage occurred during shipping. In particular, check the
accessories and cables. If damage is evident, or if it fails to operate according to the specifications, contact your dealer or Hioki representative.
,
Safety
This instrument is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, using the instrument in a way not described in this
manual may negate the provided safety features. Before using the
instrument, be certain to carefully read the following safety notes.
Mishandling during use could result in injury or death,
as well as damage to the instrument. Be certain that
you understand the instructions and precautions in the
manual before use.
With regard to the electricity supply, there are risks of
electric shock, heat generation, fire, and arc discharge
due to short circuits. If persons unfamiliar with
electricity measuring instrument are to use the
instrument, another person familiar with such
instruments must supervise operations.
Safety Symbol
Indicates cautions and hazards. When the symbol is printed on the
instrument, refer to a corresponding topic in the Instruction Manual.
Indicates that only insulated conductors suited to the voltage of the
circuit under test can be measured.
In this manual, the risk seriousness and the hazard levels are classifi ed as
follows.
Indicates an imminently hazardous situation that will result in death
or serious injury to the operator.
Indicates a potentially hazardous situation that may result in death
or serious injury to the operator.
Indicates a potentially hazardous situation that may result in minor
or moderate injury to the operator or damage to the instrument or
malfunction.
IMPORTANT
Indicates information related to the operation of the instrument or
maintenance tasks with which the operators must be fully familiar.
Indicates prohibited actions.
Indicates the action which must be performed.
Symbols for Various Standards
Indicates the Waste Electrical and Electronic Equipment Directive
(WEEE Directive) in EU member states.
Indicates that the product conforms to regulations set out by the
EU Directive.
Instrument Installation
Avoid the following locations that could cause an accident or damage to the
instrument.
• Exposed to direct sunlight
Exposed to high temperature
• In the presence of corrosive or explosive gases
• Exposed to water, oil, other chemicals, or solvents
• Exposed to high humidity or condensation
• Exposed to a strong electromagnetic field or
electrostatic charge
• Exposed to high levels of particulate dust
• Near induction heating systems (such as highfrequency induction heating systems and IH
cooking equipment)
• Subject to vibration
Usage Notes
Follow these precautions to ensure safe operation and to obtain the
full benefits of the various functions.
Preliminary Checks
Before using the instrument, verify that it operates normally to ensure
that no damage occurred during storage or shipping. If you find any
damage, contact your authorized Hioki distributor or reseller.
Do not use the device to measure bare conductors.
Doing so may result in a short-circuit or electrical shock.
Make measurements at a location on an insulated wire
that has a suitable amount of insulation for the circuit
voltage.
• Before using the instrument, make sure that the
insulation on the cable is undamaged and that no
bare conductors are improperly exposed. Using the
instrument in such conditions could cause an electric
shock, so contact your authorized Hioki distributor or
reseller for repair.
• Avoid contact between the cable and the measured
line in order to protect the cable from damage. Any
contact can cause the device to malfunction and
lead to short-circuits or electric shock.
• Ensure that the input does not exceed the maximum
input current to avoid instrument damage, shortcircuiting and electric shock resulting from heat
building.
• This instrument is not drip-proof. Water droplets on
the connector may result in malfunctions.
• Keep the cables well away from heat sources, as bare
conductors could be exposed if the insulation melts.
• To avoid damage to the instrument, protect it from
physical shock when transporting and handling. Be
especially careful to avoid physical shock from dropping.
• The cable is hardened under the 0 degree or colder
environment. Do not bend or pull it to avoid tearing
its shield or cutting cable.
• When the power to lines to be measured is turned on
or off, a current flowing through the lines can exceed
considerably the maximum allowable current of the
device. This could result in damage to the device.
Make sure that there is not any over-current.
• This instrument is designed for use indoors. It can
be operated at temperatures between -40 and 85°
C without degrading safety.
• Store the instrument with the clamp closed. If the clamp
being open is subject to physical shock unexpectedly,
the tips of the clamp sensor may be deformed.
• If foreign objects are pinched between the clamp tips,
remove them gently with a soft brush or others,
avoiding opening and closing the clamp forcedly. The
clamp sensor with foreign objects stuck or deformed
sensor cannot perform accurate measurements.
• Avoid stepping on or pinching cables, which could
damage the cable insulation.
• Be careful to avoid dropping the instrument or
otherwise subjecting them to mechanical shock,
which could damage the mating surfaces and
adversely affect measurement.
• Do not touch the cores with the clamp opened. If
the cores are subject to static electricity, the
instrument may be damaged.
Overview
The CT6841, CT6841-05, CT6843 and CT6843-05 AC/DC
Current Probes are designed to measure AC and DC currents
of up to 20 A or 200 A, respectively, at a high level of precision.
They offer excellent frequency characteristics (amplitude and
phase) as well as excellent temperature characteristics
(sensitivity and offset) and can be used not only for current
measurement, but also for high-precision power measurement.
Usage with Other Hioki Products
This device is used in connection with a dedicated instrument
(Hioki). See “Specifications” for details.
Names of Parts
Options
9705 Conversion Cable
CT9900 Conversion Cable
The Conversion Cable makes it possible to connect to and use
with products that cannot be directly connected to the CT6841,
CT6841-05, CT6843 or CT6843-05. (Refer to “Connection example”) (No figures are added to the accuracy.)
CT9902 Extension Cable*2(5 m), CT9903 Extension Cable*1(5 m)
• Single sensor cable, 5 m extension (max. 10 m extension)
• Up to two extension cable is connectable. (If three or more
• extension cables are connected to the device, its performance is not guaranteed)
• Add the following values to each of the accuracy per cable:
Amplitude accuracy: ±0.1% rdg. (DC
Phase accuracy: ±(0.1 × f
*1: For CT6841, CT6843 *2: For CT6841-05, CT6843-05
*3: frequency
*1
, 9318 Conversion Cable*1,
*1
, CT9901 Conversion Cable
*3
≤ f
≤ 1 kHz)
±0.5% rdg. (1 kHz
*3
kHz)° (1 kHz < f*3)
< f
*3
*2
)
Connection Example
Measurement Procedure
Pre-operation lnspection
Before using the instrument, verify that it the instrument operates normally to
ensure that no damage occurred during storage or shipping. If you find any
damage, contact your authorized Hioki distributor or reseller.
Check Items Diagnose and Solution
involving the connector or
sensor base?
Is the cable insulation torn?
Is there any cracking or
damage on the sensor?
Do not use the device to measure bare conductors.
Doing so may result in a short-circuit or electrical shock.
Make measurements at a location on an insulated wire
that has a suitable amount of insulation for the circuit
voltage.
• To prevent damage to the sensor and connected
instruments, never connect or disconnect a sensor
while the power is on.
•
When the connected instrument’s power is
turned off, do not apply current to the sensor.
Doing so may damage the device.
If you are unable to make measurements
properly, discontinue use and contact your
authorized Hioki distributor or reseller.
If there is any damage, electric shock may
result. Discontinue use and have the sensor
repaired.
• Do not place conductors carrying currents at
The device's signal output circuit incorporates protective resistance (output
resistance). When monitoring the device with a digital multimeter or other
instrument, be sure to use an instrument with a high input resistance.
2 Clamp lever
1 Lock lever
1 Clamp lever
2 Lock lever
Figure 1. Example Wiring
• Make sure the direction of the arrow on the case matches the direction of
the current flow, as shown in Figure 1. If they are oriented incorrectly, the
output signal from the sensor will be reversed
• When the device is used with a wattmeter, follow the wiring instructions
provided with the wattmeter.
• High-frequency large current at a frequency of 1 kHz or higher can increase
measurement error or distort the measured waveform due to the position of the
conductor to be measured. Locate the conductor as close as possible to the
center of the clamp. Unclamped conductors carrying a high-frequency large
current can also increase measurement error or distort the measured
waveform. Keep unclamped conductors away from the clamp of the device.
SOURCE
LOAD
Hi
Lo
Current direction
Current direction
Shielded
Figure 2. Examples of Prohibited Measurement
1.
2.
• When measuring a DC or low-frequency (1 kHz or less) current of small
magnitude, you can increase sensitivity on a relative basis by wrapping
the conductor several times around the clamp mechanism. Wrapping the
conductor 10 times will cause the device to output a signal equal to 10
times the measured current.
• When clamping the device on the high-potential side of a circuit (for
example, the "Hi" side shown in "Figure 1. Example Wiring") in the highfrequency domain, measurements may be affected by common-mode
noise. To address this issue, clamp the device to the low-potential side (for
example, the "Lo" side shown in "Figure 1. Example Wiring") as
necessary.
• 1.5-MHz harmonic noise arising from the operating principle can be
emitted.
CT6841
CT6843
Frequency
Amplitude
Phase
DC
±0.3% rdg.±0.05% f.s.
Note: An accuracy of ±0.05% f.s. is
accomplished after the offset voltage
is adjusted within a range of ±0.5 mV.
-
DC < f ≤ 100 Hz ±0.3% rdg. ±0.01% f.s. ±0.1°
100 Hz < f ≤ 500 Hz ±0.3% rdg. ±0.02% f.s. ±0.2°
500 Hz < f ≤ 1 kHz ±0.5% rdg. ±0.02% f.s. ±0.5°
1 kHz < f ≤ 5 kHz ±1.0% rdg. ±0.02% f.s. ±1.0°
5 kHz < f ≤10 kHz ±1.5% rdg. ±0.02% f.s. ±1.5°
10 kHz < f ≤ 50 kHz ±2.0% rdg. ±0.02% f.s.
±(0.5+0.1 × f kHz)°50 kHz < f ≤ 100 kHz ±5.0% rdg. ±0.05% f.s.
100 k Hz < f ≤ 300 kHz ±10% rdg. ±0.05% f.s.
300 k Hz < f ≤500 kHz ±15% rdg. ±0.05% f.s. -
500 kHz < f < 1 MHz ±30% rdg. ±0.05% f.s. -
Frequency
Amplitude
Phase
DC ±0.3% rdg. ±0.02% f.s.
Note: An accuracy of ±0.02% f.s. is
accomplished after the offset voltage
is adjusted within a range of ±0.2 mV.
-
DC < f ≤ 100 Hz
±0.3% rdg. ±0.01% f.s. ±0.1°
100 Hz < f ≤ 500 Hz
±0.3% rdg. ±0.02% f.s. ±0.2°
500 Hz < f ≤ 1 kHz
±0.5% rdg. ±0.02% f.s. ±0.5°
1 kHz < f ≤ 5 kHz
±1.0% rdg. ±0.02% f.s. ±1.0°
5 kHz < f ≤ 10 kHz
±1.5% rdg. ±0.02% f.s. ±1.5°
10 kHz < f ≤ 50 kHz
±5.0% rdg. ±0.02% f.s.
±(0.5+0.1 × f kHz)°
50 kHz < f ≤ 100 kHz
±15% rdg. ±0.05% f.s.
100 kHz < f ≤ 300 kHz
±15% rdg. ±0.05% f.s.
300 kHz < f ≤ 500 kHz
±30% rdg. ±0.05% f.s.
-
CT6841
CT6843
CT9900 Conversion Cable
CT9903 Extension Cable
9318 Conversion Cable
9705 Conversion Cable
CT6841-05
CT6843-05
CT9901 Conversion Cable
CT9902 Extension Cable
Model CT6843
Model CT6841
Frequency [Hz]
Frequency [Hz]
Input current [A rms]
Input current [A rms]
-40°C≤Ambient temperature≤60°C
-40°C<Ambient temperature≤85°C
-40°C≤Ambient temperature≤40°C
-40°C<Ambient temperature≤60°C
-40°C<Ambient temperature≤85°C
frequencies of 10 kHz or higher in close proximity to
the clamp mechanism, even if the device is not
clamped to them. Current flowing in nearby
conductors may cause self-heating of the clamp
mechanism, damaging the device.
•
When disconnecting the output connector, be
sure to release
the lock before pulling off the
connector. Forcibly pulling the connector without
releasing the lock, or pulling on the cable, can
damage the connector.
• Ground-shielded conductors cannot be accu-
rately measured.
Make sure to pass only one conductor
•
through. Single-phase
wire) cables conducted together
any reading.
(See Figure 2-1）
(2-wire) or three-phase (3-
will not produce
（See Figure 2-2）
Measurement procedure
At the start of measurement
Connect the device to the product with which you wish to use it (while
1.
that product's power is off).
Turn on the product with which you wish to use the device.
2.
Perform zero-adjustment (0 ADJ) or demagnetization (DEMAG) as
3.
necessary. (See "Demagnetization (DEMAG) and zero-adjustment (0 ADJ).")
Slide the lock lever until the "
4.
label is visible the mechanism in place.
Then slide the clamp lever to open the
clamp mechanism. Apply the clamp
mechanism to roughly the center of the
conductor being measured. (For more
information about clamp mechanism orientation, see "Figure 1.
Example Wiring.")
Slide the clamp lever to close the clamp
5.
mechanism, verify that the tips of the clamp
mechanism have met each other properly,
and slide the lock lever until the "
label is visible to lock the mechanism in
place.
Start measurement.
6.
Wiring
UNLOCKED
LOCKED
"
"
Demagnetization (DEMAG) and zero-adjustment (0 ADJ)
An offset will be output immediately after the power is turned on and when an
overcurrent in excess of the rated current is input to the device. Since this
offset will cause an error during DC current measurement, perform zeroadjustment as follows:
Slide the clamp lever to open the clamp mechanism and press the
1.
"DEMAG" button on the panel.
Open and close the clamp mechanism two or three times, confirm that
2.
the offset output is stabilized, and then slide the lock lever until the
"
LOCKED
Monitor the offset output and perform zero-adjustment with the zero-
3.
adjustment knob on the bottom of the device.
" label is visible to lock the mechanism in place.
IMPORTANT
• Zero-adjustment cannot be performed while the device is receiving current input.
• Because offset output varies with the surrounding environment and the ambient
temperature (terrestrial magnetism and devices that generate magnetic fields),
zero-adjustment should be performed at the same location at which
measurements will be made.
• If the device is connected to an instrument with a zero correction function, align
the notch of the zero-adjustment knob with the center.
• Mechanical shock, for example from dropping the instrument, may cause the
offset to shift.
• If unable to fully correct values, perform demagnification (DEMAG) several
times with the clamp in the closed position.
When measurement is complete
Slide the lock lever until the "
1.
Then slide the clamp lever to open the clamp mechanism and remove
the device from the conductor.
Turn off the product with which the device is being used.
2.
Disconnect the device from the product's connector.
3.
UNLOCKED
" label is visible.
Maintenance Service
Specifications
Accuracy
f.s.: maximum display value or scale length (Rated current)
rdg.: reading value (The value currently being measured and indicated on the
measuring instrument)
The specs of the CT6841-05 are the same as those of the CT6841 except the
output connector and options.
The specs of the CT6843-05 are the same as those of the CT6843 except the
output connector and options.
Operating Environment Indoors
Storage temperature
and humidity
Operating temperature
and humidity
Dielectric strength
Applicable standards
Product warranty period3 years
Rated current CT6841: 20 A AC/DC, CT6843: 200 A AC/DC
Output voltage CT6841: 0.1 V/A, CT6843: 0.01 V/A
Maximum input current Within a derating
Output resistance 50 Ω (±5%)
Temperature and
humidity range of
guaranteed accuracy
Period of guaranteed
accuracy
Guaranteed accuracy
period from adjustment
made by Hioki
Accuracy
Sine wave input; Conductor at center position; Connected with Model 9555-10; Not
including each effect; Measuring instrument that has an input resistance of 1 MΩ or
higher
Amplitude accuracy (Defined at the rated value or less and within the derating curve;The
accuracy defined for the frequency range of DC < f < 5 Hz is the design value)
Phase accuracy (Defined at the rated value or less and within the derating curve; The
accuracy defined for the frequency range of DC < f < 10 Hz is the design value)
, Pollution Degree II,
-40°C to 85°C (-40°F to 185°F), 80%RH or less (non-condensation)
-40 °C to 85°C (-40°F to 185°F), 80%RH or less (non-condensation)
4260 V AC (Sensitive current 1 mA), 50 Hz/60 Hz, for 1 minute,
Jaw - cable output connector
Safety : EN61010
EMC : EN61326
0°C to 40°C (32°F to 104°F), 80%RH or less
1 year
(Opening and Closing of the Sensor: Maximum 10000 times)
1 year
(Opening and Closing of the Sensor: Maximum 10000 times)
altitude up to 2000 m (6562-ft.)
Effect of radiated
radio-frequency
electromagnetic field
Effect of conducted
radio-frequency
electromagnetic field
Measurable conductor
diameter
Supply voltage ±11 V to ±15 V (Tracking)
Power supply capacity
Rated consumption
Dimensions
Mass CT6841:Approx. 350 g (12.3oz), CT6843: Approx. 370 g (13.1oz)
Cable length Approx. 3 m
Output connector
Accessories Instruction manual, Mark band (6), Carrying Case
Options
6% f.s. at 10 V/m
6% f.s. at 3 V/m
φ20 mm (0.79”) or less
CT6841:
±200 mA or less (20 A/ 55 Hz measurement, with ±12 V power supply)
CT6843:
±
250 mA or less (200 A/ 55 Hz measurement, with ±12 V power supply)
CT6841:
5 VA or less (20 A/55 Hz measurement, with ±12 V power supply)
CT6843:
6 VA or less (200 A/55 Hz measurement, with
Approx. 153W × 67H × 25D mm (excluding protrusions, cable)
Approx. 6.02”W × 2.64”H × 0.98”D
CT6841, CT6843 : hioki PL23 (Male)
CT6841-05, CT6843-05 : hioki ME15W (Male)
±
12 V power supply)
Combined accuracy and conditions
Combined accuracy = Accuracy of CT6841(-05) or CT6843(-05) + Accuracy of combined
product (Power factor: 1)
Combined product
CT9555, CT9556, CT9557 Sensor Unit
PW3390 Power Analyzer CT9900 -
PW6001 Power Analyzer CT9900 -
9602 AC/DC Clamp Input Unit
3334-10 AC/DC Power Meter - CT9901
8940 F/V Unit
8971 Current Unit
9555-10 Sensor Unit - CT9901
3390, 3390-10 Power Analyzer - CT9901
*1: Add the sensor unit output accuracy to the combined accuracy when one of the
addition functions, that is, RMS output or TOTAL OUTPUT, is used.
*2: Add ±0.1% rdg. to the combined accuracy.
*3: The sensor recognition methods vary according to the Memory HiCorder settings
(refer to the manuals of Memory HiCorder to be connected).
Derating
*3
*1
*2
*3
Required option
CT6841
CT6843
CT9900 -
-CT9901
9705+9318 CT9901+9705+9318
9318 CT9901+9318
CT6841-05
CT6843-05
Customers are not allowed to modify, disassemble, or
repair the instrument.
Doing so may cause fire, electric shock, or injury.
IMPORTANT
• Periodic calibration is necessary in order to ensure that the instrument
provides correct measurement results of the specified accuracy.
• Never use solvents such as benzene, alcohol, acetone, ether, ketones,
thinners or gasoline, as they can deform and discolor the case.
• If the instrumentseems to be malfunctioning, confirm that the cables are not
open circuited before contacting your authorized Hioki distributor or reseller.
• Pack the instrument so that it will not sustain damage during shipping, and
include a description of existing damage. We do not take any responsibility
for damage incurred during shipping.
• To clean the instrument, wipe it gently with a soft cloth moistened with water
or mild detergent.
Offset adjustment rangeCT6841: ±4 mV, CT6843: ±2 mV
Noise 5 mV pp or less (100 kHz or less)
Temperature coefficient
Effect of conductor
position
Effect of external
electromagnetic field
Effect of magnetic
Effect of common-mode
voltage
-40°C to 0°C and 40°C to 85°C (-40°F to 32°F and 104°F to 185°F)
Amplitude sensitivity : ±0.01% rdg./° or less
Offset voltage : ±0.005% f.s./°C or less
±0.1% rdg. or less
(CT6841: at 20 A input, DC to 100 Hz, using with the wire 5 mm diameter)
(CT6843: at 100 A input, DC to 100 Hz, using with the wire 5 mm diameter)
50 mA or less
(Scaled value, In a DC or 60 Hz magnetic field of 400 A/m)
CT6841: 10 mA or less (Scaled value, after 20 A DC input)
CT6843: 30 mA or less (Scaled value, after 200 A DC input)
0.05% f.s. or less (1000 V rms,
DC to 100 Hz
)
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