Maintenance and Service................................................................33
CT9555A960-03
i
ii
HIOKI CT9555A960-03
Introduction
HIOKI CT9555A960-03
Introduction
Thank you for purchasing the Hioki CT9555, CT9556, and CT9557 Sensor Unit(s).
To obtain maximum performance from the product, please read this manual rst, and
keep it handy for future reference.
Latest edition of instruction manual
The contents of this manual are subject to change, for example as a result of
product improvements or changes to specications.
The latest edition can be downloaded from Hioki’s website.
https://www.hioki.com/global/support/download
Conrming Package Contents
When you receive the device, inspect it carefully to ensure that no damage occurred
during shipping. In particular, check the accessories, panel switches, and connectors.
If damage is evident, or if it fails to operate according to the specications, contact
your authorized Hioki distributor or reseller.
Device and Accessories
Check if the contents in the package are correct.
CT9555, CT9556
Sensor Unit (device)
(The illustration shows the CT9555.)
Z1008 AC adapter (including power cord)
CT9557
Sensor Unit (device)
Instruction Manual
Z1002 AC adapter (including power cord)
Instruction Manual
1
Conrming Package Contents
HIOKI CT9555A960-03
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.
Please check Hioki’s website for the latest information.
*1: Does not support the CT9902.
*2: Supports only the CT9555.
*3: Use up to two CT9902 cables for a maximum extension of 10 m.
When using the CT9902, you must add the associated accuracy gures.
For more information, see the instruction manual for the current sensor
(s).
2
Safety Information
HIOKI CT9555A960-03
Safety Information
This device is designed to conform to IEC 61010 Safety Standards, and has been
thoroughly tested for safety prior to shipment. However, using the device in a way not
described in this manual may negate the provided safety features.
Before using the device, be certain to carefully read the following safety notes:
DANGER
Mishandling during use could result in injury or death, as well as
damage to the device. Be certain that you understand the instructions
and precautions in the manual before use.
WARNING
Individuals using an electrical measuring device for the rst time
should be supervised by a technician who has experience in electrical
measurement.
Notation
In this document, the risk seriousness and the hazard levels are classied as follows.
DANGER
WARNING
CAUTION
IMPORTANT
*
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 device or malfunction.
Indicates information related to the operation of the device or maintenance
tasks with which the operators must be fully familiar.
Indicates a high voltage hazard.
If a particular safety check is not performed or the device is mishandled,
this may give rise to a hazardous situation; the operator may receive an
electric shock, may get burnt or may even be fatally injured.
Indicates a prohibited action.
Indicates the action which must be performed.
Additional information is presented below.
3
Operating Precautions
HIOKI CT9555A960-03
Symbols on the Device
Indicates cautions and hazards. When the symbol is printed on the device, refer to
a corresponding topic in the Instruction Manual.
Indicates DC (Direct Current).
Symbols Relating to Standards
Indicates the Waste Electrical and Electronic Equipment Directive (WEEE
Directive) in EU member states.
Indicates that the product complies with standards imposed by EU directives.
Operating Precautions
Follow these precautions to ensure safe operation and to obtain the full benets of
the various functions.
DANGER
• Follow the precautions to use waveform observing devices (an
oscilloscope or a recorder, etc.) and other measuring devices that
connect a sensor (see “Specications” (p. 26)) using this device.
• Follow these precautions below when using a measuring device that
is not insulated between an input terminal and a chassis or other
input terminals.
Do not connect a terminal on the ground side except for ground
potential when inputting a signal to a terminal other than an input
terminal that connects a sensor. A short circuit current from a
terminal on the ground side to a sensor or the device may result in
electric shock or damages.
Never connect the device as shown in the illustration.
4
Operating Precautions
HIOKI CT9555A960-03
WARNING
Installing the device in inappropriate locations may cause a
malfunction of the device or may give rise to an accident. Avoid the
following locations:
• Exposed to direct sunlight or high temperature
• Exposed to corrosive or combustible gases
• Exposed to a strong electromagnetic eld or electrostatic charge
• Near induction heating systems (such as high-frequency
induction heating systems and IH cooking equipment)
• Susceptible to vibration
• Exposed to water, oil, chemicals, or solvents
• Exposed to high humidity or condensation
• Exposed to high quantities of dust particles
• Before turning the device on, make sure the supply voltage matches
that indicated on its power connector. Connection to an improper
supply voltage may damage the device and present an electrical
hazard.
• Use only the supplied Model Z1008 AC Adapter (for the CT9555/
CT9556) or Z1002 AC Adapter (for the CT9557). AC adapter input
voltage range is 100 V to 240 V AC at 50 Hz/60 Hz. To avoid electrical
hazards and damage to the device, do not apply voltage outside of
this range.
• To avoid electrical accidents and to maintain the safety
specications of this device, connect the power cord provided only
to an outlet.
• Do not connect the supply voltage improperly. Doing so may damage the
device’s internal circuitry.
• When the power is turned o, do not apply current to the sensor. Doing
so may damage the device and the sensor.
• To avoid damage to the device, do not apply voltage to output terminals
(OUTPUT terminals, RMS output terminals, and WAVE output terminals).
• The supply voltage (±12 V) is supplied from the SENSOR terminal of
the device to a sensor. Do not short circuit between pin terminals of the
SENSOR terminal, or insert a connector other than a connector of a
sensor.
• Never connect or disconnect a sensor while the device is turned on, a
measuring conductor is clamped, or a current is measured. Doing so may
cause a malfunction of the device or a sensor.
CAUTION
5
Operating Precautions
HIOKI CT9555A960-03
CAUTION
• Turn the device o before connecting the AC adapter to the device and to
AC power.
• To avoid damage to the device, protect it from physical shock when
transporting and handling. Be especially careful to avoid physical shock
from dropping.
• If the insulation on a cable or cord melts, the metal conductor may be
exposed. Do not use any cord whose metal conductor is exposed. Doing
so could result in electric shock, burns, or other hazard.
Check 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.
6
Overview and Features
HIOKI CT9555A960-03
Overview and Features
Overview
The CT9555, CT9556, and CT9557 Sensor Unit(s) are input units that can output the
measured data to measuring devices such as recorders, oscilloscopes, or electric
power meters, by connecting the Hioki high performance current sensors.
The device can be used for power measurement including the power of multiple-line
circuit.
CT687x-01, CT687xA-1, PW9100 series, CT6904 series*, and CT6904A series
*: Supports only the CT9555.
• RMS conversion function supports AC current (1-channel, RMS)
• Compact 4-channel type
• Current measurement of more than 1000 A with up to 4 streams by the 4-channel
addition function
• The main body has a 10 V to 30 V power supply that supports external batteries
7
Parts Names and Functions
HIOKI CT9555A960-03
Parts Names and Functions
CT9555
FrontRear
CT9556
CT9557
1122
33
44
FrontRear
1122
33
44
FrontRear
12121313
991010
1111
77
88
55
66
7799
88
55
66
88
1414
11
22
33
44
8
55
6677
Parts Names and Functions
HIOKI CT9555A960-03
No.NameDescription
Power supply
LED
11
DEMAG switch • The DEMAG signal is sent to the connected sensor and
22
OUTPUT
terminal
(BNC terminal)
33
Front panel
SENSOR
terminal (Hioki
44
ME15W female)
Power supply
55
switch
Power supply
jack
66
Locking clampClamp the cord of Z1008 or Z1002 so that the AC adapter is not
77
Functional
grounding
88
terminal
CT9555
When power is ON: green light
When power is OFF: no light
CT9556
When power is ON: green light
When power is OFF: no light
When input is 2.8 times the peak of the rated voltage: red light
CT9557
• CH A
When power is ON: green light
When power is OFF: no light
When input is 2.8 times the peak of the rated voltage: red light
demagnetization is performed.
• If the sensor without the DEMAG function is connected,
demagnetization is not performed.
CT9557
DEMAG of CH A does not function when the addition output is
connected with the CT9904 Connection Cable to the device that
has the Hioki ME15W at the input part of a current sensor such
as the PW6001. Perform the oset cancelation by the zero-
adjustment on the connecting device side.
• Connect to the measuring device using the BNC cable.
• Outputs a signal wave from a sensor. The sensor accuracy will
be the accuracy of the output signal.
• CT9557 outputs regardless of the TOTAL OUTPUT switch
setting.
”Operating Precautions” (p. 4)
The Hioki sensor is to be connected.
See “Specications” (p. 26, p. 28) for connectable sensors.
”Operating Precautions” (p. 4)
ON: The power is turned on.
OFF: The power is turned o.
The supplied Model Z1008 AC adapter (for CT9555/CT9556) or
Z1002 AC adapter (for CT9557) is connected.
”Operating Precautions” (p. 4)
pulled out from the power supply jack.
Grounding this terminal or connecting this terminal to the
grounding terminal of the connected device may reduce noise.
Use the terminal based on the usage status of the device.
9
Parts Names and Functions
HIOKI CT9555A960-03
No.NameDescription
RMS output
terminal
(BNC terminal)
Rear panel
99
WAVE output
terminal
(BNC terminal)
Rear panel
1010
WAVE output
terminal (Hioki
ME15W male)
1111
TOTAL OUTPUT
switch
1212
TOTAL OUTPUT
LED
1313
Serial numberThe rst four digits of the 9-digit number indicate the year (its
1414
CT9556
• Convert the signal wave from a sensor to RMS and output
as DC voltage (DC 2V f.s. at rated input of a sensor). For
accuracy, see “-2. Accuracy Specication of RMS Output Only
for CT9556 (1-channel/RMS)” (p. 27).
CT9557
• Adds the waveform signal of the sensor that is connected to
the channel with the TOTAL OUTPUT switch ON, converts it to
RMS, and outputs as a DC voltage (2 V DC f.s. at rated input
of each sensor). For accuracy, see “-3. Accuracy Specications
of Addition RMS output” (p. 31).
CT9557
• Adds the waveform signal of the sensor that is connected and
outputs as a waveform signal (2 V f.s. at rated input of each
sensor).
• Adds the waveform signal of the sensor that is connected to
the channel with the TOTAL OUTPUT switch ON, and outputs
as a waveform signal (2 V f.s. at rated input of each sensor).
For accuracy, see “-2. Accuracy Specications of Addition
Wave Output” (p. 30).
CT9557
• The same waveform signal as the No.10 terminal, but this is
a dedicated connector that supports Model PW6001. Connect
with the CT9904 Connection Cable provided as a option.
• In addition to a waveform signal, an identication signal (ID) of
the sensor that is connected to CH A is transmitted, and Model
PW6001 automatically identies the sensor.
This is the switch to select a channel for addition in the sensor
that is connected to CT9557.
Not added if the switch is OFF.
This does not aect the output to the OUTPUT terminal of the
front panel.
• CH B, CH C, and CH D
When the selecting switch for an addition channel is ON: green
light
When the selecting switch for an addition channel is OFF: no
light
When the selecting switch for an addition channel is ON and
input is 2.8 times the peak of the rated voltage: red light
last two digits only) and the month of manufacture.
Do not remove this sticker as the number is important.
10
The CT9555 and CT9556 have the label on the bottom.
Parts Names and Functions
HIOKI CT9555A960-03
• Method for calculating the additive output voltage for the CT9557
V
+ V
CH A
Additive output (V) =
V
: CH A sensor output voltage (V)
CH A
V
: Total of sensor output voltages for channels whose “Total Output” switch has
SELECT
1 + N
SELECT
SELECT
been enabled (V)
N
: Number of channels whose “Total Output” switch has been enabled
SELECT
Example: If four current sensors with same model number CT6846A (2 V/1000 A) are
connected to CH A, CH B, CH C, and CH D, and a constant current is input to each
sensor
V
+ V
CH A
Additive output (V) == 2 (V)==
1 + N
SELECT
SELECT
2 + (2 + 2 + 2)8
1 + 34
The additive output from the CT9557 would use a rate of 2 V/4000 A.
• Method for calculating the additive output voltage error for the CT9557
ε
ε
+
CH A
Additive output error =+ C9557 addition accuracy
1 + N
SELECT
SELECT
ε
: CH A sensor error
CH A
ε
SELECT
N
SELECT
: Total sensor error for channels whose “Total Output” switch has been enabled
: Number of channels whose “Total Output” switch has been enabled
11
Parts Names and Functions
HIOKI CT9555A960-03
Specic accuracy calculation example:
Assume you are measuring a circuit in which 1200 A DC branches into twin
wires.
Measure each wire (600 A DC) with a CT6846-05 and use the CT9557’s
addition function to add the readings together.
The total error if the result of the additive output is input to a PW6001, which is
then used to measure the current with its 2 kA range (1 kA range × CT ratio of 2)
can be calculated using the following formula:
(±0.38% × 1200 A) + (±0.05% × 1000 A × 2 ±0.03% × 2000 A) +
(±0.001% × 2000 A) = ±6.18 A
Consequently, the error boundary values for a measured value of 1200 A
would be 1193.82 A to 1206.18 A.
Measuring deviceReading error
CT6846-05±0.3% rdg.±0.02% f.s.–
CT9557±0.06% rdg.±0.03% f.s.–
CT9904–––
PW6001±0.02% rdg.±0.03% of range±0.001% × range*
Total±0.38% rdg.
Full scale
(range) error
±0.05% f.s.
±0.03% of range
Other errors
±0.001% × range
*: When using Probe 1, add ±20 μV to the DC accuracy (however, 2 V f.s.).
• 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.”). (Additional accuracy [for 1 unit])
• 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.”). (Additional
accuracy [for 1 unit])
• Range:
Indicates the instrument’s range. Limit values for range errors are
expressed as a percentage of the range (“% of range” or “% rng”).
12
Pre-Operation Inspection
HIOKI CT9555A960-03
Pre-Operation Inspection
Before using the instrument for the rst time, verify that it 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 itemsWhen the answer is “No”
Is insulation on any of the connection
1
cables/power supply cords damaged or
are there any exposed conductors?
Yes
Is the AC adapter damaged?Do not use if you nd any damage.
2
Yes
Inspection completed
If the power supply LED does not light up even when the power switch is turned on, it
may indicate a malfunction.
Do not use if you nd any damage.
Electric shocks or short circuits may be
caused if this instruction is not followed.
Contact your authorized Hioki distributor
or reseller.
Electric shocks may be caused if this
instruction is not followed. If you nd any
damage, replace the parts with those
specied by Hioki.
13
Measurement Methods
HIOKI CT9555A960-03
Measurement Methods
Use CT9555 or CT9556
Be sure to read before use “Operating Precautions” (p. 4).
Make sure that the power supply switch of the
1
device is turned o.
Connect the AC adapter and the power cord to
2
the device.
Pass the AC adapter cord through the locking
3
clamp.
Connect the sensor to the SENSOR terminal.
4
Refer to: “Connection/Disconnection Method of Sensors”
(p. 20)
Connect the OUTPUT terminal at the front of the
5
device and the measuring device with the BNC
cable.
Refer to: “Connect the BNC Cable” (p. 21)
(When using the RMS function: only for CT9556)
Connect the RMS terminal at the back of the
6
device and the measuring device with the BNC
cable.
Refer to: “Connect the BNC Cable” (p. 21)
3
1
2
14
Measurement Methods
HIOKI CT9555A960-03
Turn on the power supply switch and check if
7
the power LED lights up.
(To perform demagnetization)
Press the DEMAG switch.
8
Note: If DEMAG and zero-adjustment functions are
available in the sensor to be used, it is better
to perform demagnetization from the sensor.
Clamp the conductor to be measured and
9
measure.
• Use a measuring device with input resistance more than 1 MΩ.
• Also, refer to the instruction manual of the sensor to be used.
• Connect the device and the measuring instrument to the same power line. Failure
to do so may result in increased noise due to a ground loop.
15
Measurement Methods
HIOKI CT9555A960-03
Use CT9557
Be sure to read before use “Operating Precautions” (p. 4).
Make sure that the power supply switch of the
1
device is turned o.
Connect the AC adapter and the power cord to
2
the device.
1
Pass the AC adapter cord through the locking
3
clamp.
Connect the sensor to the SENSOR terminal.
4
Refer to: “Connection/Disconnection Method of Sensors”
(p. 20)
When using the addition function, observe the
following:
• Connect a sensor from CH A
• Connect the sensor with the same model
number as CH A for the channels to be added
Connect the OUTPUT terminal at the front of the
5
device and the measuring device with the BNC
cable.
Refer to: “Connect the BNC Cable” (p. 21)
From this OUTPUT terminal, the waveform signal
from the connected sensor is independently output.
This is not related to the settings of the select
switch for an addition channel.
Refer to: “When Using the Addition Function”
6
(p. 18)
2
3
CH A
Turn on the power supply switch and check if
7
the power LED of CH A lights up in green.
16
Measurement Methods
HIOKI CT9555A960-03
(To perform demagnetization)
Press the DEMAG switch.
8
Note: If DEMAG and zero-adjustment functions are
available in the sensor to be used, it is better
to perform demagnetization from the sensor.
Note: The DEMAG SW of CH A will not function
when the device is connected to a measuring
device that automatically identies with the
CT9904.
Clamp the conductor to be measured and
9
measure.
• Use a measuring device with input resistance more than 1 MΩ.
• Also, refer to the instruction manual of the sensor to be used.
• Connect the device and the measuring instrument to the same power line. Failure
to do so may result in increased noise due to a ground loop.
17
Measurement Methods
HIOKI CT9555A960-03
When Using the Addition Function
Adds the signal of the connected sensor, and outputs an addition signal from the
TOTAL OUTPUT terminal at the back of the device when the addition function is
used.
When 100% of the rated value is input to each sensor, the output signal is output as
2 V after addition averaging.
Turn ON the select switch of the addition
1
channel at the front of the device and check if
the TOTAL OUTPUT LED lights up in green.
Refer to: “Connect the BNC Cable” (p. 21)
Turn o the switch for channels that are not to be
added or not connected to sensors.
Connect the WAVE (BNC) terminal at the back
2
of the device and the measuring device with the
BNC cable.
Refer to: “Connect the BNC Cable” (p. 21)
(When converting the addition signal to the RMS
value and measuring with the DC signal)
Connect the RMS output (BNC) terminal at the
3
back of the device and the measuring device
with the BNC cable.
Refer to: “Connect the BNC Cable” (p. 21)
18
Measurement Methods
CT9557
HIOKI CT9555A960-03
(When measuring the addition signal with PW6001)
Connect the WAVE output terminal (Hioki
4
CH A
ME15W) at the back of the device to Model
PW6001 using the CT9904 Connection Cable
provided as a option.
Refer to: “Connect CT9557 and the Measuring Device with
the CT9904” (p. 21)
• The sensor connected to CH A is automatically identied
by connecting power meter.
When connecting to a power meter with the HIOKI PL23
(such as the 3390), set the CT ratio listed in the current
sensor’s instruction manual.
• Set the CT ratio on the power meter based on the
number of connected sensors.
1 sensor (CT ratio = 1), 2 sensors (CT ratio = 2), 3
sensors (CT ratio = 3), and 4 sensors (CT ratio = 4)
• For the PW series (HIOKI ME15W connector):
CT ratio = Number of sensors connected to the CT9557
• For the PW series (HIOKI PL23 resin connector):
CT ratio = Number of sensors connected to the CT9557 × CT ratio listed in the sensor’s
instruction manual
CT9904 Connection Cable
(female)
Example
• When connecting two CT6844A (500 A rating) to the PW6001: CT ratio = 2
• When connecting three CT6843A (200 A rating) to the PW6001: CT ratio = 3
• When connecting two CT6846A (1000 A rating) to the 3390: CT ratio = 2 × 2 = 4
• When connecting four CT6877A (2000 A rating) to the 3390: CT ratio = 4 × 10 = 40
When there is an oset, perform the zero-adjustment (0ADJ) on the power
meter.
Connection diagram
Sensor
FrontRear
(female)
Tag
(male)
Device
CT9904
19
Measurement Methods
HIOKI CT9555A960-03
Connection/Disconnection Method of Sensors
ConnectDisconnect
Orient such that the wide part is towards
the upper part of the device
terminal (OUTPUT terminals, RMS terminals, or
WAVE terminals) and concave part of the BNC
cable of the device.
Rotate to the right and lock.
2
To disconnect, unlock by rotating the connector of
the BNC cable to the left and pull out the connector.
BNC
terminal of
the device
Output
terminal
BNC cable
1
2
BNC cable
Connect CT9557 and the Measuring Device with the CT9904
Verify that the CT9557 and the measuring
1
instrument to which you intend to connect it
(PW6001, etc.) are both o.
Verify that no current is being input to the current
sensors that are connected to the CT9557.
Connect the WAVE terminal on the CT9557’s
2
rear panel (Hioki ME15W male connector)
to the measuring instrument with a CT9904
Connection Cable.
• CT9557: Female shape side of the CT9904
Connection Cable
• Measuring instrument: Male shape side of the
CT9904 Connection
Cable (with tag)
Refer to: “Connection diagram” (p. 19)
CT9557 rear
Female
21
Measurement Methods
HIOKI CT9555A960-03
Turn on the power of CT9557.
3
Turn on the measuring device.
4
If the measuring instrument you’re using provides
functionality for automatically the type of current sensor
that has been connected, it will detect the current sensor
connected to Ch. A on the CT9557.
Remove CT9557 and the Measuring Device
Verify that no current is being input to the
1
current sensors that are connected to the
CT9557.
Turn o the measuring device.
2
Turn o the power of CT9557.
3
Remove the Model CT9904.
4
22
Application Examples
HIOKI CT9555A960-03
Application Examples
Monitor the Current (CT9555, and CT9556)
Monitor the output of OUTPUT on the front panel for the DC (Idc) and the RMS output
on the rear panel for the AC (Iac).
AC can be monitored even with the logger that has no RMS conversion function such
as a wireless logger.
Additionally, DC and AC can be measured with a high degree of precision in
combination with the high-precision DMM.
Commercial power
system
Solar panel
dc
I
Power conditioner
ac
I
Waveform signal outputRMS output
Logger
LR 8410
WIRELESS LOGGING STATION
波形/数値設定ファイル
モニタ
キーロック
秒押し
3
取消
保存開始停止
電源
アラーム
充電
チャネルユニット
設定ナビ
決定
スクロール/カーソル
23
Application Examples
I
HIOKI CT9555A960-03
Measuring High Current or Multiple-line Circuit (Addition
Function)
Connect a sensor to each branched line and convert the signal to an added signal
using the device.
As shown in the illustration below, only one power meter (power analyzer) is needed
because multiple sensors can be handled as one sensor.
Solar panel
AC measurement of a 4-cable circuit
Power conditioner
I
a
I
b
abcd
I
I
c
I
d
=
I
+
+
a
+
b
c
d
I
I
I
=Ir1+Ir2+Ir3+Ir4
r
=Is1+Is2+Is3+Is4
I
s
=It1+It2+It3+It4
I
t
AC current
Commercial
power
system
I
r
I
s
I
t
When measuring multiple lines with a total current that exceeds the rated value
of the current sensor used, ensure that the conductors adjacent to the current
sensor are as far away as possible from the sensor because the current sensor
may be aected by the adjacent conductors.
24
Application Examples
HIOKI CT9555A960-03
Measuring Leakage Current or Current in a Non-measurable
Line (Addition Function)
The addition function can be used as a subtracting function based on the wiring
method.
Leakage current can be easily measured by adding single-phase lines and threephase lines.
Even if there are only 2 sensors for the three-phase line, current for the line that is not
measured can also be measured.
Solar panel
Power conditioner
I
Hi
I
Lo
-
≒
Hi
Lo
I
I
Simple measurement for leakage current
(Waveform observation, RMS output)
Simple measurement for leakage current
(Waveform observation, RMS output)
I
Measurement of current owing in wires under
measurement
(Use in 3V3A measurement with an ammeter)
Commercial
power system
I
R
r
I
S
s
I
T
t
o
+
+
I
≒
I
I
r
I
s
t
o
+
+
I
=0 →
I
I
r
s
t
=-(
+
I
t
)
I
I
r
s
The measurement is aected by errors in each current sensor when measuring
the leakage current.
For example, if the error of a current sensor that is combined with a 500 A line is
0.1%, the error is equivalent to 0.5 A, which is a simplied measurement.
25
Specications
HIOKI CT9555A960-03
Specications
CT9555 (1-channel), and CT9556 (1-channel/RMS)
Specications
1. General Specications
Operating environmentIndoors, Pollution Degree 2, altitude up to 2000 m (6562 ft.)
Operating temperature and
humidity
Storage temperature and
humidity
StandardsSafety EN 61010
Power supply • Z1008 AC adapter
Input terminal (main unit
front side)
Output
terminal
LED displayWhen power is ONgreen light
CT9555WAVE output
CT9556WAVE output
Temperature; -10°C to 50°C (14°F to 122°F)
Humidity; Less than 40°C (104°F): 80% RH or less
(no condensation)
From 40°C to 45°C (104°F to 113°F): 60% RH or less
(no condensation)
From 45°C to 50°C (113°F to 122°F): 50% RH or less
(no condensation)
-10°C to 50°C (14°F to 122°F), 80% RH or less
(no condensation)
EMC EN 61326
Rated supply voltage: 100 V to 240 V AC (Voltage
uctuations of ±10% from the rated supply voltage are taken
into account.)
Rated supply frequency: 50 Hz/60 Hz
Anticipated transient overvoltage: 2500 V
Maximum rated power: 45 VA (including AC Adapter), 15 VA
(main unit only)
• External power supply
Rated supply voltage: 10 V to 30 V DC
Maximum rated power: 15 VA
Hioki ME15W (female)
BNC (female)
(main unit front side)
BNC (female)
(main unit front side)
RMS output
(main unit rear side)
When power is OFFno light
When OVER is detected
(CT9556 only)
BNC (female)
When the input’s crest factor
exceeds 2.8 (during 2 V rms
sine wave input)
: red light
26
Specications
HIOKI CT9555A960-03
DimensionsApprox. 33 mm(W) × 67 mm(H) × 132 mm(D)
(1.30" W × 2.64” H × 5.20” D) (excluding protruding parts)
MassApprox. 200 g (7.1 oz.) (excluding AC adapter)
Product warranty period3 years
AccessoriesRefer to: “Device and Accessories” (p. 1)
Connectable current sensor Current sensor with Hioki ME15W at the output terminal
Connectable current sensor
(Can be connected using
CT9900)
Current sensor with Hioki PL23 at the output terminal
CT6841, CT6843, CT6844, CT6845, CT6846,
CT6862, CT6862-10, CT6863, CT6863-10, CT6865,
9709, 9709-01, 9709-10, and 9272-10, etc.
OptionsRefer to: “Options” (p. 2)
2. Accuracy Specications
-1. Basic Specications
WAVE
output
RMS
output
(CT9556 only)
Front panel
BNC
Rear panel
BNC
Independently outputs waveform signals from each connected
current sensor
Accuracy = (Accuracy of the current sensor)*
2
Converts waveform signals of each connected current sensor
to the true RMS value and outputs
Accuracy = (Accuracy of the current sensor) + (Accuracy of
the RMS output)*
2
*2: If a combined accuracy has been dened for the connected current sensor, give that gure
priority.
-2. Accuracy Specication of RMS Output Only for CT9556 (1-channel/RMS)
Measurement methodMeasurement of true RMS value
Rated input voltage2 V rms (Rated output signal of sensor)
Output voltageDC 2 V f.s.
Output resistance50
Conditions of guaranteed
accuracy
(±5%)
Ω
Guaranteed accuracy period: 1 year
Guaranteed accuracy period from adjustment made by Hioki:
1 year
Temperature and humidity for guaranteed accuracy:
23°C±5°C, 80% RH or less
When a sine wave is input to the SENSOR terminal
1% to 150% of rated input voltage, design value of
5 Hz<f≤10 Hz
27
Specications
HIOKI CT9555A960-03
Amplitude
DC ±0.2% rdg.±0.1% f.s.
5 Hz<f≤10 Hz ±0.3% rdg.±0.5% f.s.
10 Hz<f<45 Hz ±0.2% rdg.±0.2% f.s.
45 Hz≤f≤66 Hz ±0.2% rdg.±0.1% f.s.
66 Hz<f≤10 kHz ±0.2% rdg.±0.2% f.s.
Frequency
Temperature coecient-10°C to 18°C, 28°C to 50°C less than ±0.03% f.s./°C
Response time0.8 s (Time within the accuracy specication range when
Crest factor3 (when a sine wave 2 V rms is input)
Eect of radiated radiofrequency electromagnetic
eld
Eect of conducted radiofrequency electromagnetic
eld
10 kHz<f≤100 kHz ±0.3% rdg.±0.5% f.s.
100 kHz<f≤300 kHz ±5.0% rdg.±0.5% f.s.
300 kHz<f≤700 kHz ±7.0% rdg.±0.5% f.s.
700 kHz<f≤1 MHz ±10.0% rdg.±1.0% f.s.
shifting by 0%→90%)
0.8 s (Time within the accuracy specication range when
shifting by 100%→10%)
6% f.s. at 10 V/m
6% f.s. at 10 V
CT9557 (4-channel/RMS) Specications
1. General Specications
Operating environmentIndoors, Pollution Degree 2, altitude up to 2000 m (6562 ft.)
Operating temperature and
humidity
Storage temperature and
humidity
StandardsSafety EN 61010
28
Temperature; -10°C to 50°C (14°F to 122°F)(during use at or
below the current sensor’s rated current value) (The top limit
of the operating temperature range is reduced to 40°C when
the current sensor’s rated current is exceeded.)
Humidity; Less than 40°C (104°F): 80% RH or less (no
condensation)
From 40°C to 45°C (104°F to 113°F): 60% RH or less (no
condensation)
From 45°C to 50°C (113°F to 122°F): 50% RH or less (no
condensation)
-10°C to 50°C (14°F to 122°F), 80% RH or less (no
condensation)
EMC EN 61326
Specications
HIOKI CT9555A960-03
Power supply • Z1002 AC adapter
Rated supply voltage: 100 V to 240 V AC (Voltage
uctuations of ±10% from the rated supply voltage are taken
into account.)
Rated supply frequency: 50 Hz/60 Hz
Anticipated transient overvoltage: 2500 V
Maximum rated power: 155 VA (including AC Adapter), 60 VA
(main unit only)
• External power supply
Rated supply voltage: 10 V to 30 V DC
Maximum rated power: 60 VA
Input terminal (main unit
front side)
Output terminalWAVE output
LED displayWhen power is ON (CH A) green light (CH A)
DimensionsApprox. 116 mm(W) × 67 mm(H) ×132 mm(D)
MassApprox. 420 g (14.8 oz.) (excluding AC adapter)
Product warranty period3 years
AccessoriesRefer to: “Device and Accessories” (p. 1)
Connectable current sensor Current sensor with Hioki ME15W (male) at the output terminal
Connectable current sensor
(Can be connected using
CT9900)
Hioki ME15W (female) × 4-channel
BNC (female) × 4-channel
(main unit front side)
Addition RMS output
(main unit back side)
Addition WAVE output
(main unit back side)
When power is OFF (CH A) no light (CH A)
When TOTAL OUTPUT is
ON (CH B to CH D)
When power is OFF (CH A) no light (CH B to CH D)
When OVER is detected
(all channel)
(4.57” W × 2.64” H × 5.20” D) (excluding protruding parts)
wave input): red light
The LED display does not light
up when the TOTAL OUTPUT
function is o.(CH B to CH D)
29
Specications
HIOKI CT9555A960-03
Connectable devicesDirectly connectableDevice with Hioki ME15W
(female) at the sensor input
Connectable in the
CT9901
OptionsRefer to: “Options” (p. 2)
Device with Hioki PL23 (female)
at the sensor input
2. Accuracy Specications
-1. Basic Specications
WAVE
output
RMS
output
*: If a combined accuracy has been dened for the connected current sensor, give that gure
priority.
Front panel
BNC
Rear panel
BNC
ME15W
Rear panel
BNC
Independently outputs waveform signals from each connected
current sensor
Accuracy = (Accuracy of the current sensor)*
Adds and outputs waveform signals from each connected
current sensor
Accuracy = (Accuracy of the current sensor) + (Accuracy of
the addition wave output)*
Outputs by converting the addition waveform of waveform
signals from each connected sensor to the true RMS value
Accuracy = (Accuracy of the current sensor) + (Accuracy of
the addition RMS output)*
-2. Accuracy Specications of Addition Wave Output
Measurement methodAdds a waveform signal from the current sensor that is
connected from CH A selected by the select switch to CH D
and outputs the waveform
Rated input voltage2 V f.s. (Rated output signal of current sensor)
Output voltage2 V f.s. (Does not depend on the number of channels)
Output resistance50
Conditions of guaranteed
accuracy
(±5%)
Ω
Guaranteed accuracy period: 1 year
Guaranteed accuracy period from adjustment made by Hioki:
1 year
Temperature and humidity for guaranteed accuracy:
23°C±5°C, 80% RH or less
When the same sine wave is input to each SENSOR terminal
1% to 150% of rated input voltage, design value of
DC<f<10 Hz
Temperature coecient-10°C to 18°C, 28°C to 50°C less than ±0.01% f.s./°C
Eect of radiated radiofrequency electromagnetic
eld
Eect of conducted radiofrequency electromagnetic
eld
6% f.s. at 10 V/m
6% f.s. at 10 V
-3. Accuracy Specications of Addition RMS output
Measurement methodMeasurement of true RMS value
Rated input voltage2 V f.s. (Rated output signal of current sensor)
Output voltageDC 2 V f.s.
Output resistance50
Conditions of guaranteed
accuracy
DC ±0.2% rdg.±0.1% f.s.
5 Hz<f≤10 Hz ±0.3% rdg.±0.5% f.s.
10 Hz<f<45 Hz ±0.2% rdg.±0.2% f.s.
45 Hz≤f≤66 Hz ±0.2% rdg.±0.1% f.s.
66 Hz<f≤10 kHz ±0.2% rdg.±0.2% f.s.
Frequency
Temperature coecient-10°C to 18°C, 28°C to 50°C less than ±0.03% f.s./°C
10 kHz<f≤100 kHz ±0.3% rdg.±0.5% f.s.
100 kHz<f≤300 kHz ±5.0% rdg.±0.5% f.s.
300 kHz<f≤700 kHz ±7.0% rdg.±0.5% f.s.
700 kHz<f≤1 MHz ±10.0% rdg.±1.0% f.s.
(±5%)
Ω
Guaranteed accuracy period: 1 year
Guaranteed accuracy period from adjustment made by Hioki:
1 year
Temperature and humidity for guaranteed accuracy:
23°C±5°C, 80% RH or less
When a sine wave is input to the SENSOR terminal
1% to 150% of rated input voltage, design value of
5 Hz<f≤10 Hz
Amplitude
31
Specications
HIOKI CT9555A960-03
Response time0.8 s (Time within the accuracy specication range when
shifting by 0%→90%)
0.8 s (Time within the accuracy specication range when
shifting by 100%→10%)
Crest factor3 (when a sine wave 2 V rms is input)
Eect of radiated radiofrequency electromagnetic
eld
Eect of conducted radiofrequency electromagnetic
eld
6% f.s. at 10 V/m
6% f.s. at 10 V
32
Maintenance and Service
HIOKI CT9555A960-03
Maintenance and Service
WARNING
Customers are not allowed to modify, disassemble, or repair the
device. Doing so may cause re, electric shock, or injury.
Troubleshooting
If the device seems to be malfunctioning, contact your authorized Hioki distributor or
reseller.
Cleaning
To clean the device, wipe it gently with a soft cloth moistened with water or mild
detergent.
IMPORTANT
Never use solvents such as benzene, alcohol, acetone, ether, ketones, thinners or
gasoline, as they can deform and discolor the case.
Calibration
The calibration period varies with the conditions and environment of use. It is
recommended to determine a calibration period based on those factors and to have
the device regularly calibrated by Hioki.
Replaceable Parts and Operating Lifetimes
The characteristics of some of the parts used in the product may deteriorate with
extended use.
Parts
Electrolytic condenser
To ensure the product can be used over the long term, it is recommended to replace
these parts on a periodic basis.
When replacing parts, please contact your authorized Hioki distributor or reseller.
The service life of parts varies with the operating environment and frequency of use.
Parts are not guaranteed to operate throughout the recommended replacement cycle.
Operating
Lifetime
Approx. 10
years
Remarks/conditions
The circuit board on which the corresponding part is
mounted is required to be replaced.
33
Maintenance and Service
HIOKI CT9555A960-03
Fuse
The fuse is housed in the power unit of the device. If the power does not turn on, the
fuse may be blown. If this occurs, a replacement or repair cannot be performed by
customers. Please contact your authorized Hioki distributor or reseller.
Disposal
Handle and dispose of the device in accordance with local regulations.