CT7126, CT7131, CT7136
NO
Parts Names
CT7126, CT7131
The model illustrated below is Model CT7126.
IMPORTANT
Attach the jaw around only one conductor. If you clamp
single-phase (2-wire) or three-phase (3-wire) conductors
together, the device will not be able to make measurement.
Make sure the jaw is rmly closed.
5
Lock the lever.
6
(LOCK is displayed.)
Push the lock
lever.
AC CURRENT SENSOR
Instruction Manual
EN
Oct. 2016 Edition 1 Printed in Japan
CT7136A961-00 16-10H
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 one (1) year 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 CT7126, CT7131, CT7136
AC Current Sensor. To obtain maximum performance from
the device, please read this manual rst, and keep it handy
for future reference.
Be sure to also read the separate booklet “Current Sensor
Operating Precautions” before use.
Troubleshooting
If the device seems to be malfunctioning, contact your
authorized Hioki distributor or reseller.
Overview
This current sensor has a Hioki PL14 output connector,
enabling it to be automatically recognized when connected to
a compatible instrument for simple setup.
The sensor has the adequate frequency characteristics
(amplitude) and temperature characteristics for not only
current measurement but also high-accuracy power
measurement.
Protective
barrier
Output
connector
Cable
CT7136
Protective
barrier
Output
connector
Cable
Lever
Jaw
Current
direction
indicator
Lock lever
Lever
Jaw
Current
direction
indicator
Measurement Methods
Inspection Before Use
Verify that the device operates normally to ensure that no
damage occurred during storage or shipping. If you nd any
damage, contact your authorized Hioki distributor or reseller.
Check Items Remedy
Is the jaw cracked or
damaged?
Is the cable insulation
torn?
Is the cable broken at the
base (of the connector or
grip)?
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.
OK
Close the tips of the jaw completely before performing
measurement. If the output cable is caught on the jaw or the
jaw is forced into the measurement location, it may not close
completely. If this occurs, it will not be possible to obtain an
accurate measurement.
NO
NO
Procedure
CT7126, CT7131
Connect the device to the compatible
1
instrument.
Compatible instrument
Align them and insert the connector
Align the arrow on the device’s output connector with the mark
on the compatible instrument’s sensor input connector and insert
the connector.
Unlock the lever.
2
(LOCK is not
displayed.)
Open the jaw.
3
Attach the jaw around only one of the
4
conductors so as to position it at the center of
the jaw.
Current direction
Source
If attached with the current direction indicator pointed in
the opposite direction of the current, the phase is displayed
deviating by 180 degrees.
Pull the lock
lever.
Pull the lever
while pressing it
inward.
Conductor
Load
Current direction indicator
Once measurement is complete, remove the
7
device from the conductor and disconnect it
from the instrument.
CT7136
Connect the device to the compatible
1
instrument.
Compatible instrument
Align them with each other and
insert the connector.
Align the arrow on the device’s output connector with the
mark
connector and insert the connector.
Attach the jaw around only one of the
2
conductors so as to position it at the center of
the jaw.
Current direction
If the clamp is attached with the current direction indicator
pointed in the opposite direction of the current, the phase is
displayed deviating by 180 degrees.
Make sure the jaw is rmly closed.
3
Once measurement is complete, remove the
4
device from the conductor and disconnect it
from the instrument.
on the compatible instrument’s sensor input
Conductor
Load
Source
Current direction indicator
To Extend the Cable
Use of only the optional Model L0220 series is allowed. The
cable is extendable by up to 10 m. The device can operate
under the following conditions: however, no performances of
the device are guaranteed.
• Two or more extension cables are connected in series.
• The cable is extended by more than 10 m.
See “Measurement Specications” for more details about the
effect.
1 2 3 4
Specications
Frequency Derating Characteristics
CT7126
General Specications
Operating environment Indoors, Pollution Degree 2,
Operating temperature
and humidity
Storage temperature and
humidity
Dustproofness and
waterproofness
Standards Safety: EN61010
Dielectric strength 4.29 kV AC (sensed current: 1 mA) for 1 minute (between
Power supply Not required
Dimensions Approx. 46W × 135H × 21D mm
Mass Approx. 190 g (6.7 oz.)
Cable length Approx. 2.5 m (98.43″)
Product warranty period 1 year
Accessories Instruction Manual, Current Sensor Operating
Options Model L0220-01 Extension Cable (2 m)
altitude up to 2000 m (6562 ft.)
−10°C to 50°C (14°F to 122°F)
80% RH or less (no condensation)
−20°C to 60°C (−4°F to 140°F)
80% RH or less (no condensation)
IP40 (EN60529)
(with sensor connected and jaw closed)
EMC: EN61326
jaw and grip, between jaw and output connector)
(1.81″W × 5.31″H × 0.83″D)
Precautions
Model L0220-02 Extension Cable (5 m)
Model L0220-03 Extension Cable (10 m)
Output Specications / Measurement Specications
Output connector Hioki PL14 Connector
Rated measurement
current
Output rate 10 mV/A
Maximum measurement
current
Measurable conductor
diameter
Maximum rated voltage
to earth
Conditions of guaranteed accuracy
• Guaranteed accuracy period:
• Guaranteed accuracy period after
adjustment made by Hioki:
• Opening and closing of the jaw:
• Accuracy guarantee for temperature
and humidity:
• Accuracy of AC measurement is guaranteed for sine wave inputs
Measurement accuracy *
Frequency Amplitude Phase
40 Hz ≤ f < 45 Hz ±0.8% rdg. ±0.01% f.s. –
45 Hz ≤ f ≤ 66 Hz ±0.3% rdg. ±0.01% f.s. ±2.0 deg.
66 Hz < f ≤ 1 kHz ±1.0% rdg. ±0.01% f.s. ±2.0 deg.
1 kHz < f ≤ 5 kHz ±1.0% rdg. ±0.02% f.s. ±2.0 deg.
5 kHz < f ≤ 20 kHz ±2.0% rdg. ±0.04% f.s. ±2.0 deg.
Temperature coefcient In the operating temperature range, add 0.02% rdg./°C
Effect of conductor
position (deviation from
center)
Effect of external
magnetic eld (400 A/m,
50 Hz/60 Hz)
Maximum extendable
length
60 A AC
RMS value, continuous Within the frequency derating
Peak value (under the
RMS value conditions
described above)
15 mm or less
φ
300 V AC (Measurement category III)
Anticipated transient overvoltage: 4000 V
1 year
1 year
10000 times or less
23°C±5°C (73.4°F±9°F), 80% RH or less
(at temperatures other than 23°C±5°C).
Within ±0.3% (for the input of a current of 60 A,
f ≤ 100 Hz, owing through a 5-mm-diameter or thicker
wire)
0.1 A or less
By 10 m (depends on the instrument to which the device
is to be connected.)
Add ±0.1% rdg. to amplitude of sensor measurement
accuracy; and ±(0.05 × f kHz) deg. to phase.
curve stated separately
100 A peak
CT7131
General Specications
Operating environment Indoors, Pollution Degree 2,
Operating temperature
and humidity
Storage temperature and
humidity
Dustproofness and
waterproofness
Standards Safety: EN61010
Dielectric strength 4.29 kV AC (sensed current: 1 mA) for 1 minute (between
Power supply Not required
Dimensions Approx. 46W × 135H × 21D mm
Mass Approx. 190 g (6.7 oz.)
Cable length Approx. 2.5 m (98.43″)
Product warranty period 1 year
Accessories Instruction Manual, Current Sensor Operating
Options Model L0220-01 Extension Cable (2 m)
Altitude up to 2000 m (6562 ft.)
−10°C to 50°C (14°F to 122°F)
80% RH or less (no condensation)
−20°C to 60°C (−4°F to 140°F)
80% RH or less (no condensation)
IP40 (EN60529)
(with sensor connected and jaw closed)
EMC: EN61326
jaw and grip, between jaw and output connector)
(1.81″W × 5.31″H × 0.83″D)
Precautions
Model L0220-02 Extension Cable (5 m)
Model L0220-03 Extension Cable (10 m)
Output Specications / Measurement Specications
Output connector Hioki PL14 Connector
Rated measurement
current
Output rate 1 mV/A
Maximum measurement
current
Measurable conductor
diameter
Maximum rated voltage
to earth
Conditions of guaranteed accuracy
• Guaranteed accuracy period:
• Guaranteed accuracy period after
adjustment made by Hioki:
• Opening and closing of the jaw:
• Accuracy guarantee for temperature
and humidity:
• Accuracy of AC measurement is guaranteed for sine wave inputs
Measurement accuracy *
Frequency Amplitude Phase
40 Hz ≤ f < 45 Hz ±0.8% rdg.±0.02% f.s. ±1.5 deg.
45 Hz ≤ f ≤ 66 Hz ±0.3% rdg.±0.02% f.s. ±1.0 deg.
66 Hz < f ≤ 1 kHz ±0.8% rdg.±0.02% f.s. ±1.0 deg.
1 kHz < f ≤ 5 kHz ±1.0% rdg.±0.04% f.s. ±1.0 deg.
5 kHz < f ≤ 20 kHz ±2.0% rdg.±0.05% f.s. ±2.0 deg.
Temperature coefcient In the operating temperature range, add 0.02% rdg./°C
Effect of conductor
position (deviation from
center)
Effect of external
magnetic eld (400 A/m,
50 Hz/60 Hz)
Maximum extendable
length
100 A AC
RMS value, continuous
Peak value (under the
RMS value conditions
described above)
15 mm or less
φ
300 V AC (Measurement category III)
Anticipated transient overvoltage: 4000 V
1 year
1 year
10000 times or less
23°C±5°C (73.4°F±9°F), 80% RH or less
(at temperatures other than 23°C±5°C).
Within ±0.3% (for the input of a current of 100 A,
f ≤ 100 Hz, owing through a 5-mm-diameter or thicker
wire)
0.1 A or less
By 10 m (depends on the instrument to which the device
is to be connected.)
Add ±0.1% rdg. to amplitude of sensor measurement
accuracy; and ±(0.05 × f kHz) deg. to phase.
Furthermore, up to 2% f.s. effect is expected under the
condition of conducted radio-frequency electromagnetic
eld of 10 V.
Within the frequency derating
curve stated separately
200 A peak
CT7136
General Specications
Operating environment Indoors, Pollution Degree 2,
Operating temperature
and humidity
Storage temperature and
humidity
Dustproofness and
waterproofness
Standards Safety: EN61010
Dielectric strength 8.54 kV AC (sensed current: 1 mA) for 1 minute (between
Power supply Not required
Dimensions Approx. 78W × 152H × 42D mm
Mass Approx. 350 g (12.3 oz.)
Cable length Approx. 2.5 m (98.43″)
Product warranty period 1 year
Accessories Instruction Manual, Current Sensor Operating
Options Model L0220-01 Extension Cable (2 m)
altitude up to 2000 m (6562 ft.)
−10°C to 50°C (14°F to 122°F)
80% RH or less (no condensation)
−20°C to 60°C (−4°F to 140°F)
80% RH or less (no condensation)
IP40 (EN60529)
(with sensor connected and jaw closed)
EMC: EN61326
jaw and grip, between jaw and output connector)
(3.07″W × 5.98″H × 1.65″D)
Precautions
Model L0220-02 Extension Cable (5 m)
Model L0220-03 Extension Cable (10 m)
Output Specications / Measurement Specications
Output connector Hioki PL14 Connector
Rated measurement
current
Output rate 1 mV/A
Maximum measurement
current
Measurable conductor
diameter
Maximum rated voltage
to earth
Conditions of guaranteed accuracy
• Guaranteed accuracy period:
• Guaranteed accuracy period after
adjustment made by Hioki:
• Opening and closing of the jaw:
• Accuracy guarantee for temperature
and humidity:
• Accuracy of AC measurement is guaranteed for sine wave inputs
Measurement Accuracy *
Frequency Amplitude Phase
40 Hz ≤ f < 45 Hz ±0.8% rdg. ±0.01% f.s. ±1.0 deg.
45 Hz ≤ f ≤ 66 Hz ±0.3% rdg. ±0.01% f.s. ±0.5 deg.
66 Hz < f ≤ 1 kHz ±0.8% rdg. ±0.02% f.s. ±0.5 deg.
1 kHz < f ≤ 5 kHz ±1.0% rdg. ±0.02% f.s. ±0.5 deg.
5 kHz < f ≤ 20 kHz ±2.5% rdg. ±0.04% f.s. ±2.0 deg.
Temperature coefcient In the operating temperature range, add 0.02% rdg./°C
Effect of conductor
position (deviation from
center)
Effect of external
magnetic eld (400 A/m,
50 Hz/60 Hz)
Maximum extendable
length
600 A AC
RMS value, continuous Within the frequency derating
Peak value (under the
RMS value conditions
described above)
46 mm or less
φ
1000 V AC (Measurement category III)
600 V AC (Measurement category IV)
Anticipated transient overvoltage: 8000 V
1 year
1 year
10000 times or less
23°C±5°C (73.4°F±9°F), 80% RH or less
(at temperatures other than 23°C±5°C).
Within ±0.5% (for the input of a current of 100 A,
f ≤ 100 Hz, owing through a 5-mm-diameter or thicker
wire)
0.1 A or less
By 10 m (depends on the instrument to which the device
is to be connected.)
Add ±0.1% rdg. to amplitude of sensor measurement
accuracy; and ±(0.05 × f kHz) deg. to phase.
Furthermore, up to 1% f.s. effect is expected under the
condition of conducted radio-frequency electromagnetic
eld of 10 V.
curve stated separately
900 A peak
CT7126 Frequency Derating Characteristics
70
60
50
40
30
20
10
Maximum measured current [A]
0
10 100 1 k 10 k 100 k
Frequency [Hz]
CT7131 Frequency Derating Characteristics
140
120
100
80
60
40
20
Maximum measured current [A]
0
10 100 1 k 10 k 100 k
Frequency [Hz]
CT7136 Frequency Derating Characteristics
700
600
500
400
300
200
100
Maximum measured current [A]
0
10 100 1 k 10 k 100 k
Frequency [Hz]
Notes Common to All Models
* Specied for sine wave inputs and with the conductor positioned at the
center of the jaw. Not including any effects.
Amplitude accuracy (Specied for currents of not exceeding the rated value
and within the derating curve.)
Phase accuracy (Specied for currents not exceeding the rated value or
currents within the derating curve, whichever are smaller.)
f.s.: The rated measurement current.
rdg.: The value currently being measured and indicated on the measuring
instrument.
5 6 7 8
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