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OK
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www.hioki.com/
CT6841A
HIOKI CT6841E961-00
AC/DC CURRENT PROBE
Instruction Manual
Feb. 2022 Edition 1
CT6841E961-00 22-02H
EN
DANGER
Do not preform measurement around a bare conductor. Doing
so may result in a short-circuit or an electric shock. Take
measurements at a location on an insulated wire with sucient
insulation for the circuit voltage.
The maximum measurement current varies with the frequency,
and the current that can be measured continuously is limited. Do
not measure currents in excess of the derating curve. Damage to
the device or overheating can malfunction, a re, or burn.
WARNING
Do not place the cable in contact with the measured line. Any
contact can cause the device to malfunction and lead to a shortcircuit or electric shock.
Part Names
Top
Current direction
arrow
Side
Jaws
Lock
Jaw slider
Instruction plate
Demagnetization
button (DEMAG)
Bottom
The device’s signal output circuit includes a protective resistance (output
resistance). Use a measuring instrument, including a digital multimeter,
with high input resistance to monitor the output signal. (1 M
recommended.)
or more is
Ω
Procedure
Connect the device to an measuring instrument that
1
has been turned o.
Turn the instrument on.
2
Perform demagnetization (DEMAG) and zero
3
adjustment (0 ADJ) (if needed).
See “Demagnetization (DEMAG) and zero adjustment (0 ADJ).”
Unlock the jaw lock. (UNLOCKED will appear.)
4
LockJaw slider
Warranty
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 choosing the Hioki CT6841A AC/DC Current Probe. To ensure
your ability to get the most out of this device over the long term, please read
this manual carefully and keep it available for future reference.
Carefully read the separate document entitled “Operating Precautions” before
use.
Inspection
When you open the package, carefully inspect the device to ensure that
everything is in good condition, and that no damage occurred during
shipping. If the device seems to have been damaged or does not work as
specied, contact your authorized Hioki distributor or reseller.
Overview
The CT6841A is an openable clamp current sensor designed to measure AC
and DC currents of up to 20 A at a high level of precision.
This, which has excellent frequency characteristics (amplitude, phase)
and temperature characteristics (sensitivity, oset voltage), can be used to
measure power with high precision as well as current.
Precautions for Use
Observe the following precautionary information to ensure that the device
can be used safely and in a manner that allows it to perform as described in
its specications.
CAUTION
• Do not place any foreign object between the jaw tips or insert any
foreign object into the gap of the jaws. Doing so may worsen the
performance of the sensor or the opening-closing operation of the
sensor head.
• Do not apply current to the device when the instrument connected
with the device has been turned o. Doing so could damage the
device.
• Avoid stepping on or pinching the cable, which could damage its
insulation.
• Do not drop the device or subject the device to impact. Doing so
could damage the jaws’ facing core surfaces, adversely aecting
measurement.
• Do not touch the cores with the jaw opened. If the cores are subject
to static electricity, the device may be damaged.
• Do not leave the carrying case in an area exposed to direct sunlight
or high temperatures, for example, in a vehicle. Leaving the case
under a high-temperature environment can deform its interior.
• Do not plug/unplug the connector to/from a measuring instrument
left turned on. Doing so will damage the device and instrument.
• Keep the jaw closed when the device is not in use. Leaving the
jaw open can cause dust or dirt lying on the facing core surfaces,
damaging the device.
• The current owing through the line to be measured can
considerably exceed the maximum allowable current of the device
when it is turned on and o. Make sure that there is no risk of
overcurrent that could damage the device.
• Disengage the lock, then unplug the connector while gripping the
connector’s shell (i.e., do not pull on the cable) to avoid damaging
the connector.
• The cable is hardened in freezing temperatures. Do not bend or pull
it to avoid tearing its shield or causing a break.
Symbol on the device
Indicates that the device can only be used at a location on an
insulated wire with sucient insulation for the circuit voltage.
Shipping precautions
During shipment of the device, handle it carefully so that it is not damaged
due to a vibration or shock.
Maintenance and Service
If the device becomes dirty, wipe the device softly with a soft cloth moistened
with water or a neutral detergent.
IMPORTANT
Never use solvents such as benzene, alcohol, acetone, ether, ketone,
thinners or gasoline. Doing so could deform and discolor the device.
Measurements are degraded by dirt on the jaws’ facing core surfaces, so
keep the surfaces clean by gently wiping them with a soft, dry cloth.
Output connector
Zero-adjustment dial
(0 ADJ)
Options
The options listed below are available for the device. To order an option,
please contact your authorized Hioki distributor or reseller. Options are
subject to change. Check Hioki’s website for the latest information.
CT9901 Conversion Cable
This cable can connect the device to a product that does not support a direct
connection. (No accuracy reduced)
CT9902 Extension Cable (5 m)
• This one cable can extend the device’s output cable by 5 m (up to 10 m).
• Up to two extension cable is connectable. (The device’s performance is not
assured with three or more extension cables connected.)
• Add the following values to the accuracy per cable:
Amplitude accuracy: ±0.1% of reading (DC ≤ f ≤ 1 kHz)
±(0.5 + 0.01 × f) percent of reading (1 kHz < f)
Phase accuracy: ±(0.1 × f) degrees (1 kHz < f)
f: frequency (kHz)
Phase Compensation Values
For phase compensation of the PW6001 and PW3390, enter the following
compensation values (typical):
Frequency: 100.0 kHz, phase dierence: −3.59°
The PW8001, which can automatically set the phase compensation values,
requires no entry.
Measuring Current
Inspecting the device before use
Check the device for any damage that may have occurred during storage or
shipping, and perform functional checks before use. If you nd any damage
to the device, contact your authorized Hioki distributor or reseller.
Inspection item Remedy
Any parts of the cable sheath
have no damage.
The jaws have no crack or
damage.
Do not place any conductors, around which the device is not clamped,
near the jaws if they carry currents having a frequency of 10 kHz or
higher.
Current owing through nearby conductors may cause self-heating of
the jaws, damaging the device.
If you nd any damage, request the
repair without use.
Failure to do so could cause an electric
shock.
CAUTION
Release the jaw slider to open the jaw.
5
Clamp the device around one conductor only, then
6
close the jaw.
IMPORTANT
Clamp the device around one conductor only. Clamping the
device around two or more of conductors in a bundle prevents
the device from measuring any current regardless of whether the
measurement target is a single-phase or three-phase circuit.
• Check that the jaws’ tips engage fully with each other.
• Clamping the device with its current direction arrow pointing to
the source side will reverse the output signal’s polarity.
Source side
Conductor
Current direction
arrow
Lock the jaw. (LOCKED will appear.)
7
Start measurement.
8
Remove the device from the conductor after
9
measurement have nished.
Turn the instrument o.
10
Disconnect the device from the instrument.
11
55
Current direction
44
Load side
66
OK
NO
77
NO
Shield
Demagnetization (DEMAG) and zero adjustment (0 ADJ)
Immediately after the device is turned on or if an over-current exceeding
the rated current is input, the device will output an oset voltage. Because
the oset voltage becomes an error for DC current measurement, perform
demagnetization and zero adjustment as follows:
Press the DEMAG button
1
while opening the jaw.
DEMAG button
Open and close the jaw several times, then check if the
2
outputted oset voltage displayed on the measuring
instrument’s screen has been stabilized.
Lock the jaw. (LOCKED will appear.)
3
Turn the zero-adjust dial (0 ADJ) to
4
zero the outputted oset voltage
displayed on the instrument’s
screen.
Notch
• You cannot perform zero adjustment while current is inputted.
Maximum input current (A rms)
HIOKI CT6841E961-00
• Ambient temperatures and the surrounding environment, such as terrestrial
magnetism and adjacent equipment generating magnetic elds, will aect
outputted oset voltage. Perform zero adjustment at the location where you
will measure current.
• If the device is connected to a zero-correction-equipped instrument, align
the notch of the zero-adjustment dial with the center.
• Mechanical shock, for example from dropping the device, may cause the
oset voltage to shift.
• Perform demagnetization (DEMAG) several times, leaving the jaw closed if
the oset voltage cannot be zeroed.
• When measuring a DC or a low-frequency (1 kHz or less) low current,
you can relatively increase sensitivity by wrapping the conductor several
times around the jaw. The device can output a signal equal to 10 times the
measured current by wrapping the conductor 10 times.
• Measurement in a high-frequency
region may become susceptible
to common-mode noise if the
device is clamped to the highpotential side of a circuit. Clamp
the device to the low-potential side
as necessary.
• The device may output 1.65 MHz harmonic noise due to the operating
principle.
• Measuring a high-frequency (1 kHz or more) large current can increase an
error or distort an output waveform due to the inuence of the conductor
position. Place the conductor to be measured as close to the center of the
jaws’ aperture as possible. An adjacent conductor, around which the device
is not clamped, carries a current of 500 A or more, or that with a frequency
of 1 kHz or more can increase an error or distort an output waveform.
Keep the device as far away from such conductors as possible during
measurement.
• Keep the surface temperature of the conductor to be measured at 105°C or
less.
Source
side
High
Current direction
Low
Specications
Accuracy labeling
Reading (display value):
Indicates the value displayed by the instrument. Limit values for reading
errors are expressed as a percentage of the reading (“% of reading” or
“% rdg”).
Range:
Indicates the measurement range of the instrument. Limit values for range
errors are expressed as a percentage of the range (“% of range” or “% rng”).
Full scale (rated current):
Indicates the rated current. Limit values for full-scale errors are expressed
as a percentage of the full scale (“% of full scale” or “% f.s.”).
Operating
environment
Operating
temperature and
humidity range
Storage temperature
and humidity range
Standards Safety: EN 61010
Withstand voltage 4260 V AC (current sensitivity: 1 mA), 50 Hz/60 Hz,
Power supply Suppliable from the PW8001, PW6001, PW3390,
Maximum rated
power
Interface Dedicated interface (ME15W)
Dimensions Approx. 153W × 67H × 25D mm (6.02″W × 2.64″H ×
Dimensions of jaws Approx. 63H × 25D mm (2.48″H × 0.98″D)
Output cable length Approx. 3 m
Weight Approx. 370 g (13.1 oz.)
Product warranty
duration
Accessories Mark band (×6), carrying case, Instruction Manual,
Indoor use, pollution level 2, altitude up to 2000 m
(6562 ft.)
−40°C to 85°C (−40°F to 185°F), 80% RH or less
(non-condensing)
−40°C to 85°C (−40°F to 185°F), 80% RH or less
(non-condensing)
EMC: EN 61326
for 1 min.
Between the jaw and the cable’s output terminal
CT9555, CT9556, CT9557, U8977, or an external
DC power supply.
Rated supply voltage: ±11 V to ±15 V (tracking)
Maximum rated current:
±200 mA (during measurement of 20 A current with
55 Hz, when ±12 V power is supplied)
5 VA or less (during measurement of 20 A current
with 55 Hz, when ±12 V power is supplied)
0.98″D, excluding protrusions and the cable)
3 years (excluding the jaws and cable)
Operating Precautions (0990A907)
Load
side
Options CT9901 Conversion Cable
Memory function Memory-function-equipped instruments can load the
Rated current 20 A AC/DC
Measurable
conductor diameter
Maximum input
current
Output voltage 100 mV/A
Output resistance 50
Adjustable range of
oset voltage
Accuracy guarantee
conditions
CT9902 Extension Cable
device’s sensor information.
Compatible model: PW8001
20 mm or less
φ
Current not more than the frequency derating curve
(Fig. 1)
Up to ±60 A peak (design value) is allowable only
within 20 ms at an ambient temperature of 40°C or
less.
±10
Ω
Ω
±4 mV
Accuracy guarantee duration:
1 year or 10000 cycles of opening/closing,
whichever comes rst
Accuracy guarantee duration after adjustment made
by Hioki:
1 year
Accuracy guarantee temperature and humidity
range:
0°C to 40°C (32°F to 104°F), 80% RH or less
No warming up is required.
Input: sine wave or DC; connected to a measuring
instrument with an input resistance of 1 M
line-to-earth voltage: 0 V; no external magnetic eld;
a conductor located at the aperture center
±10%;
Ω
Measurement accuracy
Frequency
DC 0.2% + 0.05% —
DC < f ≤ 100 Hz 0.2% + 0.01% ±0.1°
100 Hz < f ≤ 500 Hz 0.3% + 0.02% ±0.2°
500 Hz < f ≤ 1 kHz 0.5% + 0.02% ±0.5°
1 kHz < f ≤ 5 kHz 1% + 0.02% ±1°
5 kHz < f ≤ 10 kHz 1.5% + 0.02% ±1.5°
10 kHz < f ≤ 50 kHz 2% + 0.02%
50 kHz < f ≤ 100 kHz 5% + 0.05%
100 kHz < f ≤ 300 kHz 10% + 0.05%
300 kHz < f ≤ 500 kHz 15% + 0.05%
500 kHz < f ≤ 1 MHz 30% + 0.05%
Frequency band 2 MHz (±3 dB typical) —
• Unit for f in the calculation formulas: kilohertz (kHz)
• DC accuracy is dened after the oset voltage has been regulated at
±0.5 mV or less.
• The amplitude and phase accuracy are specied with 110% of full scale
input or less and not exceeding derating curve (Fig. 1). However, the
accuracy dened for the frequency range of DC < f < 10 Hz is the design
values.
• Add ±0.03% of reading to amplitude accuracy when input is 100% of full
scale to 110% of full scale.
Linearity error*
*1: The output voltage is measured while the input current (DC) is changed
in 4 A increments in the following order: +20 A, 0 A, −20 A, 0 A, and +20 A.
This error is dened from dierences between the regression line
obtained from the above-described measurement and measured points.
*2: Dened as the ratio of errors to the rated current.
Output noise 1.2 mV rms or less (≤1 MHz)
Eects of
temperature
Eects of
magnetization
Common-mode
voltage rejection
ratio
(CMRR)
Eects of conductor
position
1, *2
±[(% of reading) + (% of full scale)]
±20 ppm typical
At an ambient temperature of between −40°C and
0°C as well as 40°C and 85°C
Amplitude sensitivity:
±0.01% of reading per degree Celsius
Oset voltage:
±0.005% of full scale per degree Celsius
10 mA or less (value converted into an input current,
dened after 20 A DC is inputted)
DC to 1 kHz: 140 dB or more
1 kHz to 10 kHz: 125 dB or more
10 kHz to 100 kHz: 100 dB or more
100 kHz to 1 MHz: 80 dB or more
(Eect on output voltage divided by common-mode
voltage)
DC to 100 Hz: ±0.1% of reading or less (20 A input)
For a conductor 5 mm in diameter
Amplitude
Phase
±(0.5 +
0.1 × f)
degrees
Eects of external
magnetic elds
Eects of radiated
radio-frequency
electromagnetic eld
Eects of conducted
radio-frequency
electromagnetic eld
50 mA or less
(Values converted into input current, in a DC or
60 Hz magnetic eld of 400 A/m)
6% of full scale at 10 V/m
6% of full scale at 10 V
Compatible instrument
1. PW8001 Power Analyzer
Combinatorial accuracy with the U7001
Frequency
DC 0.22% + 0.1% 0.22% + 0.1%
45 Hz ≤ f ≤ 66 Hz 0.22% + 0.06% 0.22% + 0.06%
Bands other than
DC or
45 Hz ≤ f ≤ 66 Hz
• For other measurement items, the sum of the U7001 accuracy and the
sensor accuracy (full-scale error also takes sensor rating into account.)
• Add ±0.15% of range for the 400 mA and 800 mA range.
• The accuracy addition under each condition dened in the specications of
the Power Analyzer and sensor will also be applied.
• Dened after zero adjustment.
Combinatorial accuracy with the U7005
Frequency
DC 0.22% + 0.08% 0.22% + 0.08%
45 Hz ≤ f ≤ 66 Hz 0.21% + 0.03% 0.21% + 0.03%
Bands other than
DC or
45 Hz ≤ f ≤ 66 Hz
• For other measurement items, the sum of the U7005 accuracy and the
sensor accuracy (full-scale error also takes sensor rating into account.)
• Add ±2% of range for the 400 mA range.
• Add ±1% of range for the 800 mA range.
• Add ±0.1% of range for the 2 A range.
• The accuracy addition under each condition dened in the specications of
the Power Analyzer and sensor will also be applied.
• Dened after zero adjustment.
2. PW6001 Power Analyzer
Combinatorial accuracy
Frequency
DC 0.22% + 0.08% 0.22% + 0.1%
45 Hz ≤ f ≤ 66 Hz 0.22% + 0.04% 0.22% + 0.05%
Bands other than
DC or
45 Hz ≤ f ≤ 66 Hz
• For other measurement items, the sum of the PW6001 accuracy and
sensor accuracy (full-scale error also takes sensor rating into account.)
• Add ±2% of range for the 400 mA range.
• Add ±1% of range for the 800 mA range.
• Add ±0.1% of range for the 2 A range.
• The accuracy addition under each condition dened in the specications of
the Power Analyzer and sensor will also be applied.
• Dened after zero adjustment.
3. PW3390 Power Analyzer
Combinatorial accuracy
Frequency
DC 0.25% + 0.12% 0.25% + 0.12%
45 Hz ≤ f ≤ 66 Hz 0.24% + 0.07% 0.24% + 0.07%
Bands other than
DC or
45 Hz ≤ f ≤ 66 Hz
• For other measurement items, the sum of the PW3390 accuracy and
sensor accuracy (full-scale error also takes sensor rating into account.)
• Add ±0.15% of range for the 0.4 A and 0.8 A range.
• The accuracy addition under each condition dened in the specications of
the Power Analyzer and sensor will also be applied.
• Dened after zero adjustment.
Current Active power
±[(% of reading) + (% of range)]
(U7001 accuracy) + (sensor accuracy)
(Full-scale error also takes sensor
rating into account.)
Current Active power
±[(% of reading) + (% of range)]
(U7005 accuracy) + (sensor accuracy)
(Full-scale error also takes sensor
rating into account.)
Current Active power
±[(% of reading) + (% of range)]
(PW6001 accuracy) + (sensor accuracy)
(Full-scale error also takes sensor rating
into account.)
Current Active power
±[(% of reading) + (% of range)]
(PW3390 accuracy) + (sensor accuracy)
(Full-scale error also takes sensor rating
into account.)
Phase
(U7001
accuracy)
+ (sensor
accuracy)
Phase
(U7005
accuracy)
+ (sensor
accuracy)
Phase
(PW6001
accuracy)
+ (sensor
accuracy)
Phase
(PW3390
accuracy)
+ (sensor
accuracy)
4. CT9555, CT9556, CT9557 Sensor Unit
Combinatorial accuracy
• The sensor accuracy is applicable. (Dened with an output coaxial cable of
1.6 m or less)
• Add accuracy of a sensor unit when RMS or Total output is used.
• The accuracy addition under each condition dened in the specications of
a measuring instrument and the sensor will also be applied.
5. U8977 3CH Current Unit
Combinatorial accuracy
• (U8977 accuracy) + (sensor accuracy)
• The accuracy addition under each condition dened in the specications of
the Memory HiCorder and sensor will also be applied.
• Dened after zero adjustment.
6. Other compatible products
Using the CT9901 Conversion Cable allows the device to be compatible with
the following products.
Product name Combinatorial accuracy, conditions
9555-10 Sensor
Unit
3390, 3390-10
Power Analyzer
9602 AC/DC
Clamp Input Unit
3334-10 AC/DC
Power HiTester
8971 Current Unit
50
45
40
35
30
25
20
15
10
5
0
DC 10 100 1 k 10 k 100 k 1 M
(Combinatorial accuracy) = (sensor accuracy)
Dened with an output coaxial cable of 1.6 m or less
Recognized as [AC/DC 20 A].
(Combinatorial accuracy)
= [3390(-10) accuracy] + (sensor accuracy),
(power factor: 1)
Dened after zero adjustment.
Recognized as [AC/DC 20 A] when connected to the
3193-10.
(Combinatorial accuracy)
= (9602 accuracy) + (sensor accuracy) + (±0.1% rdg),
(power factor: 1)
Dened after zero adjustment.
Recognized as [AC/DC 20 A].
(Combinatorial accuracy)
= (3334-10 accuracy) + (sensor accuracy),
(power factor: 1)
Dened after zero adjustment.
The 9318 Conversion Cable (included in the 8971) is
required.
Recognized as [AC/DC 20 A] by an auto-recognition-
equipped instrument.
(Combinatorial accuracy)
= (8971 accuracy) + (sensor accuracy)
Dened after zero adjustment.
T : Ambient temperature
A
40 A
30 A
-40℃ ≤ TA ≤ 40℃ (1 minute)
-40℃ ≤ TA ≤ 60℃ (Continuous)
-40℃ ≤ TA ≤ 85℃ (Continuous)
Frequency (Hz)
Dened when neither adjacent current nor external magnetic eld exists and
the conductor is located at the center of the jaw aperture.
Fig. 1. Frequency derating curve.
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