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Contents Introduction Notes on Safety Inspection Notes on Use Chapter 1 General 1.1 Product Overview 1.2 Features Chapter 2 Identification of Indicators Chapter 3 Measurement Procedure 3.1 Notes on Use 3.2 Measurement Procedure Chapter 4 Product Specifications...
Introduction Thank you for purchasing this Hioki 9274 Clamp-On AC/DC Sensor. In order to use this product effectively and to ensure that it enjoys a long operational life, read this Instruction Manual carefully and then retain it for future reference.
When the unit is delivered, check and make sure that it has not been damaged in transit. In particular, check the accessories, core section, and sensor connector. If the unit is damaged, or fails to operate according to the specifications, contact your dealer or Hioki representative.
If damage is found, contact your dealer or Hioki representative. • If there is any type of dust or dirt on the core contact surfaces, measurements may be affected.
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• When the power for the Current Monitor is on, keep the CAUTION core section closed, except when clamping them onto the conductor to be measured. (The facing surface of the core section can be scratched while it is open.) •...
Chapter 1 General 1.1 Product Overview When connected to the 3270 Current Monitor, this clamp- on sensor can output current waveforms without any need to cut the conductor being measured, simply by clamping the sensor onto the conductor. This equipment can thus be used in conjunction with a recorder, an oscilloscope, or other such equipment in order to record and measure current waveforms.
Chapter 2 Identification of Indicators Current direction mark "UNLOCK" indication "OPEN" indication Lever Facing surface Sensor cable Core section Sensor connector Chapter 2 Identification of Indicators...
Chapter 3 Measurement Procedure For details on how to take measurements, refer to Section 1.4, "Measurement Procedure" of the 3270 Current Monitor Instruction manual. 3.1 Notes on Use In order to prevent short circuits and injury or DANGER death, only use this sensor on circuits carrying less than 600 V peak.
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If the conductor being measured is not centered, the NOTE results may be affected by its position. (3) Press the lever forward until the "UNLOCK" indication disappears, and confirm that the lever is completely locked. Accurate measurement is not possible if "UNLOCK" is NOTE visible.
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• Immediately after powering on, there may in some cases NOTE be a large offset drift caused by self-generated heat from the Current Monitor and this unit . • When performing continuous measurements, it is necessary to be aware that the offset voltage drifts, depending on factors such as the ambient temperature.
Chapter 4 Product Specifications (Accuracy is guaranteed at 23° C ± 3°C after the power has been on for 30 minutes) ♦ Rated current 20 A (AC + DC) ♦ Output voltage 2 V /20 A (AC + DC) 50 Ω ♦...
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♦ 10 to 50°C, 80 % RH or less Storage temperature and humidity (no condensation) ♦ Equivalent to a maximum of Effect of external 20 mA (in a 400 A/m AC current magnetic fields magnetic field) Within ± 0.2 % ♦...
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Frequency (Hz) Figure 1 Input Impedance Frequency (Hz) Figure 2 Maximum Input Range Amplitude Amplitude (dB, 0dB=1 V) Phase Frequency (Hz) Figure 3 Frequency Band (example of characteristics) Chapter 4 Product Specifications...
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