Hioki CT6875A-1 Instruction Manual

CT6875A

(Current direction indicator)

OK NO

HIOKI CT6875C961-00

CT6875A-1

AC/DC CURRENT SENSOR

Instruction Manual

EN

Dec. 2021 Edition 1
CT6875C961-00 21-12H

www.hioki.com/

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 CT6875A/CT6875A-1 AC/
DC Current Sensor. 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.

Intended audience

This manual has been written for use by individuals who
use the product or provide information about how to use the
product. In explaining how to use the product, it assumes
electrical knowledge (equivalent of the knowledge possessed
by a graduate of an electrical program at a technical high
school).

Troubleshooting

•

If the device seems to be malfunctioning, contact your
authorized Hioki distributor or reseller.

•

Store the device packaging material after opening the
device. When shipping the device, use the box and
packaging materials in which it was originally shipped.

DANGER

• If the cable melts, metal parts could be exposed,

posing a hazard. Keep the cable away from
sources of heat.

• Connect the device to the secondary side of a

distribution panel. If a short-circuit occurs on
the secondary side of the distribution panel, the
panel will interrupt the short-circuit current. Do
not connect the device to the primary side of the
distribution panel because an unrestricted current

ow can damage the device and facilities if a

short-circuit occurs.

Do not use the device to measure bare conductors
to which a voltage that exceeds the maximum rated
line-to-ground voltage is being applied. Doing so
could damage the device and cause bodily injury.
If the voltage exceeds the maximum rated line­to-ground voltage, measure it using an insulated
wire with the appropriate level of insulation for the
voltage in question.

WARNING

Do not place the cable in contact with the
measured line. Any contact can cause the device
to malfunction and lead to a short-circuit or electric
shock.

CAUTION

• To prevent cable damage, do not step on cables or

pinch them between other objects. Do not bend or pull
on cables at their base.

• Do not place the device on an unstable table or
uneven surface. Doing so could cause the device to
fall or turn over, causing bodily injury or damage to the
device.

• The cable is hardened in freezing temperatures. Do
not bend or pull it to avoid tearing its shield or causing
a break.

• When the power to lines to be measured is turned on

or o󰀨, a current owing 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.

• Do not apply current to the lines to be measured while

the device turned o󰀨. This could result in damage to

the device.

Overview

This pull-through current sensor has excellent frequency
characteristics (amplitude, phase) and temperature

characteristics (sensitivity, o󰀨set), which enables

power measurement as well as current measurement.

Use with Other Hioki Products

This device is used in connection with a dedicated instrument
(Hioki product). Refer to combined accuracy and conditions

specied in the specications for details.

high-precision

Name of Each Part

Mounting holes

Top view

32

4−φ5.2

Current direction indicator

135

Output connector

Front view

Cable

φ36

Through
window

12.5

60

(Unit: mm)

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

Connecting the CT9901 enables the device to connect to an
instrument that does not support direct connection with the device (No

accuracy is a󰀨ected).

CT9902 Extension Cable

• Connecting a CT9902 enables the device cable to be extended by
5 m (max. 10 m).

• Up to two of the Extension Cable available (If three or more
extension cables are connected to the device, its performance is
not guaranteed).

• Add the following to the sensor accuracy for each cable used:

Amplitude accuracy: ±0.1% of reading (DC ≤ f* ≤ 1 kHz)

±(0.1 + 0.01 × f*)% of reading (1 kHz < f*)

Phase accuracy: ±(0.03 × f*)° (1 kHz < f*)

*: frequency

Measurement Procedure

For correct measurement, connect the device to a measuring
instrument with an input impedance of 1 M

Inspection Before Use

Check the device for any damage that may have occurred during

storage or shipping before use. If you nd any damage to the device,

please contact your authorized Hioki distributor or reseller for repair.

Check Items Remedy
Is the device cracked or
damaged?
Is the cable insulation
torn?
Is the cable broken at the
base (of the connector or
the sensor)?

If there is any damage, electric
shock may result. Discontinue use
and contact your authorized Hioki
distributor or reseller.

Broken connections will make proper
measurement impossible.
Discontinue use and contact your
authorized Hioki distributor or reseller.

±10%.

Ω

Wiring

Make sure the direction of the arrow on the case matches the

direction of the current ow, as shown in the gure below. If they

are oriented incorrectly, the output signal from the sensor will be
reversed. When using the device in combination with a power meter,
conform to the power meter’s wiring method.

High

Arrow on case

LoadSource

I

Low

IMPORTANT

Pass only one conductor through the
device.

Passing 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.

Shield

Ground-shielded conductors cannot
be accurately measured.

• Arrange the conductor as close to the center of the through window
as possible. For a current to be measured of frequency 1 kHz or
more, the conductor position could cause increase in measured
value error or distortion of output-signal waveforms.

• If a conductor not being measured carries a current of frequency
1 kHz or more, keep such conductor at least 100 mm away
from the device. Failure to observe this could cause increase in
measured value error or distortion of output signal waveforms.

• Use the device with its surface temperature of 105°C or less.

Phase Compensation Values

Enter the following compensation values (representative values)
when performing phase compensation on the PW6001 or PW3390.

CT6875A: 200 kHz,
CT6875A-1: 200 kHz,

−

10.45°

−

12.87°

Specications

Accuracy

Reading (displayed 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 instrument’s range. 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 full scale (“% of full scale” or “% f.s.”).

Operating

Gain

Phase

Phase (compensated)

Gain

Phase

Phase (compensated)

HIOKI CT6875C961-00

environment

Operating
temperature and
humidity range

Storage temperature
and humidity range

Standards Safety: EN 61010

Withstand voltage 7.4 kV AC (sensed current: 1 mA) 50 Hz/60 Hz for

Power supply

Maximum rated power 7 VA (500 A/55 Hz measurement, ±12 V power supply)

Interface Dedicated interface (ME15W)

Dimensions Approx. 160W × 112H × 50D mm

Output cable length CT6875A: Approx. 3 m

Mounting hole
diameter

Weight CT6875A: Approx. 820 g (28.9 oz.)

Product warranty
duration

Accessories Mark band ×6

Options CT9901 Conversion Cable

Memory function Sensor information can be read for products with

Rated current 500 A AC/DC

Measurable
conductor diameter

Maximum input
current

Output voltage 4 mV/A

Maximum rated
line-to-ground voltage

Output resistance 50

Accuracy guarantee
conditions

Measurement accuracy

Frequency

DC 0.04% + 0.008%

DC < f < 16 Hz 0.1% + 0.02% ±0.1°
16 Hz ≤ f < 45 Hz 0.05% + 0.01% ±0.1°
45 Hz ≤ f ≤ 66 Hz 0.04% + 0.008% ±0.08°

66 Hz < f ≤ 100 Hz 0.05% + 0.01% ±0.1°

100 Hz < f ≤ 500 Hz 0.1% + 0.02% ±0.2°

500 Hz < f ≤ 1 kHz 0.2% + 0.02% ±0.4°

1 kHz < f ≤ 5 kHz 0.4% + 0.02% ±0.5°

5 kHz < f ≤ 10 kHz 0.4% + 0.02% ± (0.1 × f)°

10 kHz < f ≤ 50 kHz 1.5% + 0.05% ± (0.1 × f)°

50 kHz < f ≤ 100 kHz 2.5% + 0.05% ± (0.1 × f)°

100 kHz < f ≤ 1 MHz

Frequency range 2 MHz

Indoor use, pollution degree 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

1 minute, between through window and cable
output terminal

Supplied from PW8001, PW6001, PW3390, CT9555,
CT9556, CT9557, U8977 or external DC power supply
Rated supply voltage: ±11.5 V to ±15 V (Tracking)
Maximum rated current: ±400 mA (500 A/55 Hz

(6.30″W × 4.41″H × 1.97″D)

(excluding protrusions and the cable)

CT6875A-1: Approx.10 m

5.2 mm (M5 screw, recommended tightening

φ

torque: 1.5 Nm to 2.0 Nm)

CT6875A-1: Approx. 1150 g (40.6 oz.)

3 years

Instruction Manual
Operating Precautions (0990A907)

CT9902 Extension Cable

memory function support.
Applicable product: PW8001

36 mm or less

φ

Not exceeding derating curve shown in Figure 1
However, a current of up to ±1500 A peak (design

value) is allowable for up to 20 ms at 40°C or less.

1000 V (Measurement category III)
Anticipated transient overvoltage: 8000 V

±10

Ω

Ω

Accuracy guarantee duration: 1 year
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 warm-up required, sine wave inputted, connected with
measuring instrument with input resistance 1 MΩ ±10%,

line-to-ground voltage: 0 V, no external magnetic eld,

conductor arranged at center of window

Amplitude

±(% of reading + % of full scale)

0.025 × f)% + 0.05% ± (0.1 × f)°

(

(

measurement, ±12 V
power supply)

±3 dB Typical

Phase

)

• The variable f in accuracy equations is expressed in kHz.

• Accuracy of amplitude and phase is specied with 110% of full scale input
or less and not exceeding derating curve in Figure 1.

However, design values are given for DC < f < 10 Hz.

• Add ±0.01% of reading to amplitude accuracy when input is 100% of full
scale to 110% of full scale.

• For the CT6875A-01, add the following values to accuracy in the range of

1 kHz < f ≤ 1 MHz.

Amplitude accuracy: ±(0.005 × f [kHz])% of reading
Frequency bandwidth: 1.5 MHz (±3 dB Typical)

Phase accuracy: ±(0.015 × f [kHz])°

Linearity error *

O󰀨set voltage *

Amplitude error *

*1: Measuring the output voltage while cycling the input current (DC)

from +500 A → 0 A→
Dened as the di󰀨erence between the regression line calculated from

the above measurements and the measurement points.

*2: Dened as a percentage of the rated current.
*3: DC error is dened as (linearity error + o󰀨set voltage).

AC error is dened as deviation from the 55 Hz measurement point.

Output noise 300 µV rms or less (≤ 1 MHz)

E󰀨ects of

temperature

E󰀨ects of

magnetization

Common mode
rejection ratio
(CMRR)

E󰀨ects of conductor

position

E󰀨ects of external
magnetic eld

E󰀨ects of radiated

radio-frequency

electromagnetic eld

E󰀨ects of conducted

radio-frequency

electromagnetic eld

1 *2

±5 ppm Typical (23

2

±5 ppm Typical (23

3

DC: ±10 ppm Typical*
10 Hz to 100 Hz: ±0.005% Typical
100 Hz to 1 kHz: ±0.02% Typical
1 kHz to 20 kHz: ±0.08% Typical
20 kHz to 100 kHz: ±0.5% Typical
100 kHz to 300 kHz: ±1% Typical
300 kHz to 1 MHz: ±5% Typical

−

500 A → 0 A → +500 A at an interval of 100 A.

Within the range of −40°C to 0°C or 40°C to 85°C

Amplitude sensitivity: ±20 ppm of reading/°C
O󰀨set voltage: ±1 ppm of full scale/°C

10 mA or less
(input equivalent, after 500 A DC is inputted)

140 dB or more (50 Hz/60 Hz)
120 dB or more (100 kHz)

(E󰀨ect on output voltage / common-mode voltage)

DC, 50 Hz/60 Hz: ±0.01% of reading or less

10 kHz: ±0.4% of reading or less (input current: 10 A)
100 kHz: ±2.5% of reading or less (input current: 10 A)
When wire of outer diameter 10 mm is used

20 mA or less (input equivalent, under a magnetic

eld of 400 A/m DC or 400 A/m with 60 Hz)

0.5% of full scale or less at 10 V/m

0.2% of full scale or less at 10 V

°C)

°C, no input)

2

(input current: 100 A)

Connectable products

1. PW8001 Power Analyzer

-1. U7001 Combined accuracy

Frequency

DC 0.06% + 0.058% 0.06% + 0.058%

45 Hz ≤ f ≤ 66 Hz

Bands other than

DC and

45 Hz ≤ f ≤ 66 Hz

• For other measurement parameters, U7001 accuracy + sensor
accuracy (consider sensor rating for full scale error).

• For the 10 A range or the 20 A range, add ±0.15% of range.

-

• Add accuracy according to each condition in specications of the
power analyzer and sensor.

• Dened after zero adjustment has been performed.

-2. U7005 Combined accuracy

Frequency

DC 0.06% + 0.038% 0.06% + 0.038%

45 Hz ≤ f ≤ 66 Hz

Bands other than

DC and

45 Hz ≤ f ≤ 66 Hz

-

Current Power

±(% of reading + % of range)

0.06% + 0.058% 0.06% + 0.058%

U7001 accuracy + sensor accuracy

(Consider sensor rating for full scale error.)

Current Power

±(% of reading + % of range)

0.05% + 0.028% 0.05% + 0.028%

U7005 accuracy + sensor accuracy

(Consider sensor rating for full scale error.)

Phase

U7001

accuracy

+

sensor

accuracy

Phase

U7005

accuracy

+

sensor

accuracy

• For other measurement parameters, U7005 accuracy + sensor
accuracy (consider sensor rating for full scale error).

• For the 10 A range or the 20 A range, add ±0.15% of range.

• Add accuracy according to each condition in specications of the
power analyzer and sensor.

• Dened after zero adjustment has been performed.

2. PW6001 Power Analyzer

Combined accuracy

Frequency

DC 0.06% + 0.038% 0.06% + 0.058%

45 Hz ≤ f ≤ 66 Hz

Bands other than

DC and

45 Hz ≤ f ≤ 66 Hz

Current Power

±(% of reading + % of range)

0.06% + 0.028% 0.06% + 0.038%

PW6001 accuracy + sensor accuracy

(Consider sensor rating for full scale error.)

Phase

PW6001

accuracy

+

sensor

accuracy

• For other measurement parameters, PW6001 accuracy + sensor
accuracy (consider sensor rating for full scale error).

• For the 10 A range or the 20 A range, add ±0.15% of range.

• Add accuracy according to each condition in specications of the
power analyzer and sensor.

• Dened after zero adjustment has been performed.

3. PW3390 Power Analyzer

Combined accuracy

Frequency

DC 0.09% + 0.078% 0.09% + 0.078%

45 Hz ≤ f ≤ 66 Hz

Bands other than

DC and

45 Hz ≤ f ≤ 66 Hz

• For other measurement parameters, PW3390 accuracy + sensor
accuracy (consider sensor rating for full scale error).

• For the 10 A range or the 20 A range, add ±0.15% of range.

• Add accuracy according to each condition in specications of the
power analyzer and sensor.

• Dened after zero adjustment has been performed.

4. CT9555, CT9556, CT9557 Sensor Unit

Combined accuracy

• Sensor accuracy is applicable (with output coaxial cable of length

1.6 m or less).

• Add sensor unit accuracy when RMS output or total output is used.

• Add accuracy according to each condition in specications of the
products to be connected and sensor.

5. U8977 3CH Current Unit

Combined accuracy

• (U8977 accuracy) + (sensor accuracy)

• Add accuracy according to each condition in specications of
Memory HiCorder to be connected and sensor.

• Dened after zero adjustment has been performed.

6. Other connectable products

Connecting CT9901 Conversion Cable enables the device to be
used in combination with the following products:

Combined

product

9555-10
Sensor Unit

3390, 3390-10
Power Analyzer

9602
AC/DC Clamp
Input Unit

3334-10
AC/DC Power
HiTester

8971
Current Unit

Current Power

±(% of reading + % of range)

0.08% + 0.058% 0.08% + 0.058%

PW3390 accuracy+ sensor accuracy

(Consider sensor rating for full scale error.)

Combined accuracy and conditions

(Combined accuracy) =
With output coaxial cable of length 1.6 m or less

(Combined accuracy) = (3390 (-10) accuracy) + (sensor

Dened after zero adjustment has been performed.

When installed in 3193-10, recognized as [AC/DC 500 A].
(Combined accuracy) = (9602 accuracy) + (sensor

Dened after zero adjustment has been performed.

(Combined accuracy) = (3334-10 accuracy) + (sensor

Dened after zero adjustment has been performed.

The 9318 Conversion Cable (accessory of 8971) is required.
(Combined accuracy) = (8971 accuracy) + (sensor accuracy)

Dened after zero adjustment has been performed.

Sensor accuracy

accuracy), (power factor: 1)

accuracy) + (±0.1% of reading);
(power factor: 1)

accuracy); (power factor: 1)

Phase

PW3390

accuracy

+

sensor

accuracy

Figure 1. Frequency Derating Curve

2 k

1 k

100

-40℃ ≤ TA ≤ 40℃(1 minute)

-40℃ ≤ TA≤ 40℃ (1 minute)

-40℃ ≤ TA ≤ 60℃(Continuous)

-40℃ ≤ TA≤ 60℃ (Continuous)

-40℃ ≤ TA ≤ 85℃(Continuous)

10

1 10 100 1 k 10 k 100 k 1 M

DC

-40℃ ≤ TA≤ 85℃ (Continuous)

Characteristics

Frequency characteristics (Typical)

Gain

Phase

Phase (compensated)

CMRR (Typical)

Linearity error (Typical)

: Ambient temperature

T

A