CAUTION
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•
•
•
•
Do not place foreign objects between the jaws or insert
foreign objects into the gaps of the sensor head. Doing so
may worsen the performances of the sensor or interfere with
clamping action.
When the connected instrument’s power is turned off, do
not apply current to the sensor. Doing so may damage the
device.
Avoid stepping on or pinching cables, which could damage
the cables insulation.
Be careful to avoid dropping the device or otherwise
subjecting them to mechanical shock, which could damage
the jaw and adversely affect measurement.
Do not touch the cores with the jaw opened. If the cores are
subject to static electricity, the device may be damaged.
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Keep the jaw closed when not in use, to avoid accumulating
dust or dirt on the facing core surfaces, which could interfere
with clamp performance.
When the power to conductors 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.
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.
The cable is hardened under the 0°C or colder environment.
Do not bend or pull it to avoid tearing its shield or cutting
cable.
Installation Environment
WARNING
Installing the device in inappropriate locations may cause
a malfunction of device or may give rise to an accident.
Avoid the following locations:
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Exposed to direct sunlight or high temperature
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Exposed to corrosive or combustible gases
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Exposed to a strong electromagnetic field or
electrostatic charge
Near induction heating systems (such as high-
frequency induction heating systems and IH cooking
equipment)
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Susceptible to vibration
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Exposed to water, oil, chemicals, or solvents
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Exposed to high humidity or condensation
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Exposed to high quantities of dust particles
Overview
The CT6845 and CT6845-05 are openable and closable clamp
current sensors that are designed to measure AC and DC currents
of up to 500 A 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
product).
Refer to “Combined accuracy and conditions” specified in the
specifications for details.
Maintenance and Service
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To clean the device, wipe it gently with a soft cloth moistened with
water or mild detergent.
•
Measurements are degraded by dirt on the mating surfaces of the
jaw, so keep the surfaces clean by gently wiping with a soft, dry
cloth.
Names of Parts
Top
Side
Bottom
Jaw
Clamp lever
Lock Lever
emagnet
Demagnetization
D
(DEMAG)
Output
connector
CT6845-05
Output connector
Label
Zero-
adjustment
knob (0 ADJ)
Lock
Unlock
Current direction indicator
Options
9705 Conversion Cable*
1
, 9318 Conversion Cable*
1
,
CT9900 Conversion Cable*
1
, CT9901 Conversion Cable*
2
The Conversion Cable makes it possible to connect to and use
with products that cannot be directly connected to the CT6845 or
CT6845-05 (Refer to “Connection example”).
9706 Extension Cable*
1
(5 m), CT9902 Extension Cable*
2
(5 m)
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The cable length extended to 8 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 values to each of the accuracy per cable:
Amplitude accuracy: ±0.1% rdg. (DC ≤ f*
3
≤ 1 kHz)
±0.5% rdg. (1 kHz < f*
3
)
Phase accuracy:
±(0.1 × f*
3
kHz) deg. (1 kHz < f*
3
)
*1: For CT6845, *2: For CT6845-05 *3: frequency
Connection Example
Host instrument
CT6845
9705
9318
9705
9318
CT6845-05
CT9900
CT9901
3390, 3390-10, 9555,
9555-10, 9602 (3193,
3193-10, 3194), 3334-10,
9495 (3192)
3167
8951 (8855), 8971
(MR8847 series,
MR8827, MR8740)
8940 (8860 series, 8841,
8842, 8826, 8835-01)
PW6001
Cannot be directly connected to any parenthesized models. A
module is required.
Refer to “Combined accuracy and conditions” specified in the
specifications.
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4
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