DISPLAY UNIT

CM7291

Multi-functional Receiving and Display Unit to Use Right on the Field or Output to Advanced Recorder or Logger

Hioki clamp on meters are best-in-class measuring devices incorporating Hioki’s expertise in current sensing technology. The CM7291 is the wireless receiving/display and output unit for the CT7600 and CT7700 AC/DC Current Sensor series, creating a standalone clamp meter for field use or enabling waveform signals to be output to a Hioki memory recorder or logger for further analysis. Key Features • Send measured values to a smartphone or tablet using Bluetooth® wireless technology • Use the GENNECT Cross dedicated app to display and review measured values and waveforms in real time • Power supply and signal output for Current Sensor CT7000 series • Simultaneous dual display of the measured values, frequency, and output rate • Four output formats to output data to loggers or other devices (via Display Unit) • Supports AC adapter, AA alkaline batteries, and external power supply

Model No. (Order Code)

CM7291 For the CT7000 series, with built-in Bluetooth(R) wireless technology

Note: CM7290, CM7291 cannot be used alone. Use with CT7000 series. When used in combination with the CT7000 sensor series, the frequency band for current display and waveform output is narrower than the sensor band. Data can be downloaded to tablets and smartphones using Hioki’s dedicated apps available from the Google Play or App Store. (CM7291) Search for “HIOKI” and download the “GENNECT Cross” app. *Android, Google Play and the Google Play logo are trademarks of Google Inc. *iOS is a registered trademark of Cisco Technology, Inc. and/or its affiliates in the United States and certain other countries. *iPhone, iPad, iPad mini, iPad Pro and iPod touch are trademarks of Apple Inc. *Apple and the Apple logo are trademarks of Apple Inc. App Store is a service mark of Apple Inc. *Microsoft, Windows, Windows Vista, and Excel are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. *Company names and Product names appearing in this catalog are trademarks or registered trademarks of various companies. *The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by HIOKI E.E. CORPORATION is under license. *For the latest information about countries and regions where wireless operation is currently supported, please visit the Hioki website.

Guarantee3years
Bluetooth
CE
DROPPROOF

Get it on Google Play

Connect to Recorders, Data loggers, and Oscilloscopes

By connecting an AC/DC current sensor to the Display Unit CM7291, and then the system to a data logger or Memory HiCorder, you can output: • A DC or AC (up to 5 kHz/10 kHz) current waveform as-is (using WAVE mode for waveform output) • An analog signal generated by converting the input waveform to a series of RMS values (using RMS mode for RMS output) • An analog signal generated by detecting the current waveform’s peak value (using PEAK mode for peak output • An analog waveform generated by detecting the frequency of the current waveform (using FREQ mode for frequency output)


Choose from 13 different sensors

Select from an extensive lineup of sensors designed for various applications. AC/DC auto-zero current sensors are ideal for long-term recording.


Application: Record the amount of current generated by solar panels over the span of 1 week

System: Display Unit CM7291 AC/DC Auto-zero Current Sensor CT7731 Output Cord L9095 Memory HiCorder MR8870


Transfer data wirelessly using Bluetooth(R) to GENNECT Cross mobile app

Send measurement data to a smartphone or tablet using Bluetooth® wireless technology and use the GENNECT Cross dedicated app to display and review measured values and waveforms in real time.


Current Measurement Using an AC/DC Current Sensor: Auto-Zero Current Sensor Functionality

Because temperature variations cause the zero-point to shift when using a conventional DC current sensor to measure DC current, it is necessary to perform zero-adjustment periodically when recording data over an extended period of time with such a sensor. This shortcoming is caused by the effects of the Hall element that conventional DC current sensors use to to detect current. Hioki’s new auto-zero current sensors incorporate a new switching-based offset cancellation circuit developed to address this problem. The new design minimizes zero-point shift, making it possible to record DC current values over an extended period of time without the need for periodic zero-adjustment.


Current Measurement Using an AC/DC Current Sensor: WAVE Waveform Output Function

The Display Unit CM7291 converts the current waveform for current flowing in a wire to which an AC/DC current sensor has been applied to a proportional voltage signal. By inputting that signal to a digital oscilloscope or Memory HiCorder, you can measure instantaneous AC or DC current waveforms such as a motor’s starting current waveform. Alternatively, by using the CM7291’s WAVE waveform output function in combination with a data logger, you can observe the DC current generated by a PV system’s solar panels over extended periods of time. Auto-zero current sensors are ideally suited to applications in which a DC current must be observed over an extended period of time.


Current Measurement Using an AC/DC Current Sensor: RMS Mode for RMS Output

In this mode, the Display Unit CM7291 converts the current waveform for current flowing in a wire to which an AC/DC current sensor has been applied to a series of RMS values. It then outputs the result as a voltage signal (FAST: 45 Hz or greater, NORMAL: 10 Hz or greater, SLOW: 3 Hz or greater). This configuration is ideally suited to applications such as AC current measurement on the power supply side of a welding machine, which is characterized by abrupt current fluctuations, or long-term measurement of RMS values for the current waveform from an inverter operating at varying frequencies or a machine tool’s spindle motor.


Current Measurement Using an AC/DC Current Sensor: PEAK Mode for Peak Output

In this mode, the Display Unit CM7291 detects the peak value of the current waveform for current flowing in a wire to which an AC/DC current sensor has been applied at the rate of 2 kS/s (= 500 μs). It then outputs its absolute value as a voltage signal with an output refresh time of 0.02 s (FAST), 0.2 s (NORMAL), or 1 s (SLOW). This configuration is ideally suited to applications in which the maximum current value of a rapidly fluctuating power supply line or load must be continuously recorded.


Current Measurement Using an AC/DC Current Sensor: FREQ Mode for Frequency Output

In this mode, the Display Unit CM7291 calculates the frequency of the current waveform for current flowing in a wire to which an AC/DC current sensor has been applied at the user-specified interval. It then outputs the result as a voltage signal with an output refresh time of 0.2 s (FAST), 0.2 s (NORMAL), or 3 s (SLOW). In this configuration, the CM7290 can be used in applications such as frequency fluctuation inspections and testing of compressors and motors.


Basic specifications (Accuracy guaranteed for 3 years, Post-adjustment accuracy guaranteed for 3 years)* Waterproof characteristics intended to maintain measurement function; measuring energized parts while instrument is wet will increase risk of electric shock.

SensorCT7642, 7742CT7636, 7736CT7631, 7731
Measurement parametersDC, AC, DC+AC, Hz
Crest factor3 at 5000 count or 2.5 at 6000 count for AC and DC+AC
Output methodWAVE, RMS, PEAK, FREQ
Input connectorsHIOKI PL 14
Output update time PEAK--- FAST: 0.02 s / NORMAL: 0.2 s / SLOW: 1 s
FREQ--- FAST: FAST: 0.2 s / NORMAL: 0.2 s / SLOW: 3.0 s
(WAVE, RMS: analog output)
PEAK sensing duration2 ms or greater
(during PEAK MAX/PEAK MIN and PEAK output)
Other functionsAuto range, Zero adjustment at power-up, Analysis display, Filter, Output amplification, Display value hold, Backlight , Auto-power save, Save settings, keypad lock
Typical accuracy (WAVE output DC)±2.0% rdg. ±10.8 mV
(60.00 A range)
±2.5% rdg. ±30.8 mV
(60.00 A range)
±1.5% rdg. ±5.8 mV
(60.00 A range)
Typical accuracy (RMS output AC)±2.3% rdg. ±10.8 mV
(60.00 A range)
±2.8% rdg. ±30.8 mV
(60.00 A range)
±1.8% rdg. ±5.8 mV
(60.00 A range)
Communication interfaceBuilt in Bluetooth® 4.0 LE, Display of measured values on an iOS or Android handset (CM7291 only)
Power supplyLR6 alkaline batteries (AA) ×2, Continuous use: 16 h (backlight OFF and WAVE or RMS output, when used with CT7600s), Rated power 2.5 VA
or AC adapter 9445-02/03 (100 to 240V AC), or 5 to 15 V DC external power supply, Rated power 2.5 VA
Dust and water resistance *IP54 (with sensor connected and caps fitted to AC adapter and power connector)
Dimensions and mass52 mm (2.05 in)W × 163 mm (6.42 in)H × 37 mm (1.46 in)D, 220 g (7.8 oz) (including protector and battery)
AccessoriesLR6 alkaline batteries ×2, Protector ×1, Instruction manual ×1

Countries and regions where wireless operation is currently supported (CM7291)Last update: June 26, 2019

Wireless certificationJapan, United States, Canada, Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, United Kingdom, Thailand, Singapore, Korea, Australia, New Zealand, Chile, and Mexico
Exempt from the wireless regulationsViet Nam, Hong Kong, Macao, Myanmar, Russian Federation, Colombia, Pakistan, Peru, Georgia, and Kenya

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Seminar Videos On Demand

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Seminar Schedule

Registration Open

BIXPO 2019 - Gwangju, Korea

Nov 6, 2019 - Nov 8, 2019

Catalogs

Catalog: AC/DC CURRENT SENSOR CT7000 Series, DISPLAY UNIT CM7290, CM7291 Download PDF  [4MB] English
Catalog: GENNECT CROSS SF4071, SF4072 Download PDF  [3MB] English

User Guides

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Manuals

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Precautions Concerning Use of Equipment that Emits Radio Waves Japanese
English
Ver.04
Instruction Manual English
Ver.02
Instruction Manual Korean
Ver.01
Instruction Manual Simplified Chinese
Ver.01

Outline Drawings

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Ver.00

Ver.02

Declaration of Conformity


Ver.03

Drivers, Firmware

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Others

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Options

Connectable sensor

AC/DC AUTO-ZERO CURRENT SENSOR CT7731

• Make measurements over extended periods of time without the need to perform zero-adjustment • Ideal for measuring in locations with temperature variations

Learn more

AC/DC AUTO-ZERO CURRENT SENSOR CT7736

• Make measurements over extended periods of time without the need to perform zero-adjustment • Ideal for measuring in locations with temperature variations

Learn more

AC/DC AUTO-ZERO CURRENT SENSOR CT7742

• Make measurements over extended periods of time without the need to perform zero-adjustment • Ideal for measuring in locations with temperature variations

Learn more

AC/DC CURRENT SENSOR CT7631

• Observe instantaneous waveforms in laboratories and other temperature-controlled environments • Ideal for site inspections by pairing with CM7290/CM7291 Display Unit • Output 4 types of data to loggers or other DAQ via Display Unit

Learn more

AC/DC CURRENT SENSOR CT7636

• Observe instantaneous waveforms in laboratories and other temperature-controlled environments • Ideal for site inspections by pairing with CM7290/CM7291 Display Unit • Output 4 types of data to loggers or other DAQ

Learn more

AC/DC CURRENT SENSOR CT7642

• Observe instantaneous waveforms in laboratories and other temperature-controlled environments • Ideal for site inspections by pairing with CM7290/CM7291 Display Unit • Output 4 types of data to loggers or other DAQ

Learn more

AC FLEXIBLE CURRENT SENSOR CT7040 series

• Flexible Rogowski sensor easy routes through confined locations and around thick cables • Tapered tip designed to feed readily through tangled wires

Learn more

Output cord

OUTPUT CORD L9094

φ 3.5 mm (0.14 in) dia. mini plug to banana, 1.5 m (4.92 ft) length

OUTPUT CORD L9095

Connect to BNC terminal, 1.5 m (4.92 ft) length

OUTPUT CORD L9096

Connect to terminal block, 1.5 m (4.92 ft) length

Extension cable

EXTENSION CABLE L0220-01

2 m (6.56 ft) length

EXTENSION CABLE L0220-02

5 m (16.41 ft) length

EXTENSION CABLE L0220-03

10 m (32.81 ft) length

EXTENSION CABLE L0220-04

20 m (65.62 ft) length

EXTENSION CABLE L0220-05

30 m (98.43 ft) length

EXTENSION CABLE L0220-06

50 m (164.06 ft) length

EXTENSION CABLE L0220-07

100 m (328.11 ft) length

Other options

AC ADAPTER 9445-02

For USA, 100 to 240 V AC, 9 V/ 1 A

AC ADAPTER 9445-03

For EU, 100 to 240 V AC, 9 V/ 1 A

CARRYING CASE C0220

For storing sensor ×1, CM7290 ×1, AC adapter ×1, and output cord

CARRYING CASE C0221

For storing sensor ×3, CM7290 ×1, AC adapter ×1, output cord, and 30 m extension cable

MAGNETIC STRAP Z5004

PC peripherals

For the CM7291 only

GENNECT CROSS SF4071, SF4072

• Mobile app for iOS, Android • Improve efficiency of operations that repeat measurement and recording

Learn more

Applications

Gallery

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