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Iwatsu SS-521 Instruction Manual

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Instruction Manual
Current Probe
SS-520 / SS-521
Distributed by:
Sie haben Fragen oder wünschen eine Beratung? Angebotsanfrage unter +49 7121 / 51 50 50 oder über info@datatec.eu

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  • Page 1 Instruction Manual Current Probe SS-520 / SS-521 Distributed by: Sie haben Fragen oder wünschen eine Beratung? Angebotsanfrage unter +49 7121 / 51 50 50 oder über info@datatec.eu...
  • Page 2 Ⓒ2021 IWATSU ELECTRIC CO., LTD. All rights reserved．...

  • Page 3: Table Of Contents

    CONTENTS Introduction ..............1 Verifying ..............1 Safety Notes ............... 2 Usage Notes ............... 5 Overview ............23 1.1 Product Overview ............23 1.2 Features ..............24 1.3 Parts Names and Functions ........25 1.4 Measurement Workflow ..........30 Measurement Procedure ........33 2.1 Inspection Before Use ..........

  • Page 5: Introduction

    Introduction Introduction Thank you for purchasing the IWATSU SS-520, SS-521 Current Probe. To obtain maximum performance from the device, please read this manual first, and keep it handy for future reference. Verifying When you receive the device, inspect it carefully to ensure that no damage occurred during shipping.

  • Page 6: Safety Notes

    Safety Notes Options (sold separately) The following options are available for the device. Contact your authorized IWATSU distributor or reseller when ordering. • Model PS-54 Power Supply • Model PS-52 Power Supply Safety Notes This device is designed to conform to IEC 61010 Safety Standards, and has been thoroughly tested for safety prior to shipment.
  • Page 7 Safety Notes Notation In this manual, the risk seriousness and the hazard levels are classified as follows. Indicates an imminently hazardous situation DANGER that will result in death or serious injury to the operator. Indicates a potentially hazardous situation WARNING that may result in death or serious injury to the operator.
  • Page 8 Safety Notes Symbols affixed to the device Indicates cautions and hazards. When the symbol is printed on the device, refer to a corresponding topic in the Instruction Manual. Indicates that only insulated conductors suited to the voltage of the circuit under test can be measured. Symbols for various standards WEEE marking: This symbol indicates that the electrical and electronic...

  • Page 9: Usage Notes

    Using the device in such conditions could cause an electric shock, so contact your dealer or IWATSU representative for repair. • Before using the device, Verify that it operates normally to ensure that no damage occurred during storage or shipping.
  • Page 10 Usage Notes Installation For details on the operating temperature and humidity, see the “3 Specifications” (p.  4 5). WARNING • Avoid the following locations that could cause an accident, fire, or damage to the device. • Exposed to direct sunlight or high temperature •...
  • Page 11 Usage Notes Precautions during preparation for measurements WARNING To avoid shock and short circuits, turn off all power before connecting the device. CAUTION • Before turning on the power, make sure that the voltage of the power supply being used matches the supply voltage indicated on the rear panel of optional Model PS-54 or Model PS-52 Power Supply.
  • Page 12 Usage Notes CAUTION • When connecting an input connector other than a BNC connector, for example a conversion plug, do so such that the BNC center conductor is positive and other metallic parts are ground potential (or negative). Reference • Device output is terminated internally. Since the output Ω...
  • Page 13 Usage Notes Reducing the impact of offset drift* • Wait at least 30 minutes after turning on the device before making measurements. Offset drift may increase immediately after power is supplied to the probe due to self-heating and other factors. •...
  • Page 14 Usage Notes Precautions during measurement DANGER • Do not measure around a bare conductor. Doing so may result in short-circuit or electric shock. Take measurements at a location on an insulated wire where there is sufficient insulation for the circuit voltage. •...
  • Page 15 Usage Notes DANGER • When using a measurement instrument that does not provide isolation between its input terminals and chassis or other input terminals, please pay attention to the following points. The device’s reference potential is the ground potential. Do not apply a different potential to the ground side of other input connectors.
  • Page 16 Usage Notes DANGER • To prevent fire or damage of the measurement target and device as well as burns, exercise caution concerning the following when measuring high-frequency currents or currents that contain high-frequency components: • Eddy current loss may cause heating of the sensor head.
  • Page 17 Usage Notes WARNING • Do not press and hold the DEMAG/AUTO ZERO key to perform demagnetization while the conductor being measured is clamped. Doing so could damage the circuitry or cause an accident that might result in injury or death Demagnetizing Conductor •...
  • Page 18 Usage Notes CAUTION • To avoid damage to the output connector on the terminator or the BNC input terminal’s locking mechanism on the waveform measuring instrument, do not rotate with both terminals connected. Additionally, exercise care to ensure that connections are not subject to stress. •...
  • Page 19 Usage Notes CAUTION • When the PS-54, PS-52 Power Supply or waveform measurement instrument’s power is turned off, do not apply current to the device. Doing so may damage the device, the PS-54, PS-52 Power Supply and/or waveform measurement instrument. •...
  • Page 20 Usage Notes CAUTION • The device may sustain damage from self-heating even at current levels that are lower than the maximum current value defined by the maximum rated current. The maximum rated current is a recommended value that assumes sine-wave input under standard conditions.
  • Page 21 Usage Notes CAUTION • When opening the sensor head, always operate the opening lever. Subjecting the sensor head to force from the directions shown in the figure while it is locked may damage the clamping mechanism. Opening lever: Do not Sensor head in the locked state push •...
  • Page 22 *: The maximum rated current varies according to the frequency of the current being measured. See the figures as follows: “Fig.3 Derating according to frequency (SS-520)” (p.  5 0), “Fig.4 Derating according to frequency (SS-521)” (p.  5 0) • Do not use for a prolonged period without cleaning the inside.
  • Page 23 Usage Notes Reference • When using the device, note that two current sensors may not be used simultaneously with the PS-52 Power Supply, depending on the current to be measured. • The current consumption of the device depends on the current to be measured.
  • Page 24 Usage Notes Reference • To measure DC or low-frequency current, multiple windings may be used to increase relative sensitivity (10 windings multiplies the measured current by a factor of 10). However, in this case, the windings should be made radially, with a diameter of at least 20 cm. Wind radially 20 cm or more •...
  • Page 25 Usage Notes Reference • At high frequencies, common mode noise may affect measurements taken on the high voltage side of circuits. If this occurs, reduce the frequency range of the waveform measurement instrument, or clamp onto the low-voltage side of the circuit, as appropriate. Power source Load...
  • Page 26 Usage Notes Reference An increase in the volume of the resonant sound during use may indicate that the gap between the upper and lower sensors has increased in size. Since the sensor the device (see “4 Maintenance and Service” (p.  5 7)). Precautions after measurement CAUTION •...

  • Page 27: Overview

    Overview 1.1 Product Overview This device can be directly connected to a BNC input connector of a waveform measurement instrument such as an oscilloscope or recorder, and by clamping on a conductor being measured, allows the current waveform to be easily captured.

  • Page 28: Features

    • You can observe low-current waveforms at the high sensitivity of 1 V/A. • Broadband frequency characteristics SS-520: DC to 50 MHz SS-521: DC to 120 MHz • Demagnetization and zero-adjustment functions make it easy to get ready for measurement. *1: See “Sensor” (p. 26) *2: See Procedure 2 (p.

  • Page 29: Parts Names And Functions

    Parts Names and Functions 1.3 Parts Names and Functions Terminator Output connector The current waveform of the measured conductor is output at a constant sensitivity (1 V/A). Connect to the BNC input connector of the waveform measurement instrument. See p. 7 and p. 14. Ventilation holes Shell Unlock lever...
  • Page 30 Parts Names and Functions Sensor See p. 10. Sensor head Opening Current direction Sensor aperture indication Current direction indication Sensor head Clamp the device This clamps the to the conductor so conductor being that the direction in measured, and which the current carries out the being measured actual current...
  • Page 31 Parts Names and Functions CAUTION • To prevent sensor head damage, avoid abrupt temperature changes, stress, mechanical shock, application of static electricity, and other problematic phenomena.
  • Page 32 Parts Names and Functions Key and LEDs The key is used to perform demagnetization and zero- adjustment, while the LEDs indicate the device status. DEMAG/AUTO ZERO LED DEMAG/AUTO ZERO key (p. 37) Slow flashing orange: Performs Before demagnetization and zero- adjustment (when either can be performed), demagnetization and after an overload is detected, and when...

  • Page 34: Measurement Workflow

    Measurement Workflow 1.4 Measurement Workflow Before using the device, be sure to review the “Usage Notes” (p. 5) and operating procedures. Inspection Before Use (p. 33) Preparation for Measurements Connecting the device to the power supply. (p. 35) Verify that the PS-54 or PS-52 is turned off and connect the power cord to the AC electrical outlet.
  • Page 35 Measurement Workflow Connect the device’s output connector to the waveform measurement instrument. Press and hold the DEMAG/AUTO ZERO key. (At this time, do not clamp the conductor being measured.) Performing Measurements. (p. 41) Clamp the device around the conductor being measured. Lock the device’s sensor head.
  • Page 36 Measurement Workflow Unplug the PS-54 or PS-52 power cord from the electrical outlet. Waveform measurement instrument Power Source Load Load Model PS-54 or Model PS-52 Power Supply Reference The above figure illustrates an example connection between the device and a normal oscilloscope or other instrument that does not have isolated input terminals.

  • Page 37: Measurement Procedure

    Before using the device for the first time, verify that it operates normally to ensure that no damage occurred during storage or shipping. If you find any damage, contact your authorized IWATSU distributor or reseller. See: “Before sending the device for repair” (p. 59)
  • Page 38 Inspection Before Use Visual check of device and conductor being measured Operation check Check Item Action Is the sensor cracked or damaged? Do not use if damage is present, and return the device for repair. This Is the insulation on the may cause an electric cord damaged? shock.

  • Page 39: Preparation For Measurements

    Before preparation for measurements, be sure to read “Precautions during preparation for measurements” (p. 7). Items to be prepared • Model SS-520 or Model SS-521 Current Probe • Model PS-54 or Model PS-52 Power Supply (option) • Waveform measurement instrument (oscilloscope, recorder, or etc.)
  • Page 40 Turn the PS-54 or PS-52 POWER switch on. Verify the following: Model PS-54 or The front panel POWER indicator PS-52 Power light. Supply After all LEDs light up for 1 second, they behave as follows: Flashing Model SS-520 slowly or SS-521 Lights up...

  • Page 41: Performing Demagnetizing And Zero-Adjustment

    Preparation for Measurements Wait at least 30 minutes after turning on the device. Immediately after power is supplied, offset drift may increase due to the effects of self-heating of the device and other factors. To ensure accurate measurement, wait at least 30 minutes after turning on the device before performing measurement.
  • Page 42 Preparation for Measurements Reference • The DEMAG/AUTO ZERO LED flashes slowly after the device is turned on, after input in excess of a rating is removed, and until demagnetization and zero- adjustment are performed. • During demagnetization (while the DEMAG/AUTO ZERO LED is lit up), the demagnetization waveform (a waveform that attenuates over time) will be output...
  • Page 43 Preparation for Measurements Procedures Set the input coupling of the waveform measurement instrument to GND, adjust the zero position of the display. Set the input coupling of the waveform measurement instrument to DC. Connect the output connector of the device to the BNC input connector of the waveform measurement instrument.
  • Page 44 Preparation for Measurements Press and hold the DEMAG/ AUTO ZERO key for about 1 second. Do not press the key with excessive force. Zero-adjustment will be performed after demagnetization. While performing demagnetization and zero-adjustment The LED stops flashing and light up continuously.

  • Page 45: Performing Measurements

    Performing Measurements 2.3 Performing Measurements Before performing measurements, be sure to read “Usage Notes” (p. 5), and “2.1 Inspection Before Use” (p. 33), and “2.2 Preparation for Measurements” (p. 35) and perform the described steps. Procedures Pull the sensor opening Opening lever, so that the sensor head lever...
  • Page 46 Performing Measurements To lock the sensor head, push the opening lever until the JAW UNLOCKED indication disappears. JAW UNLOCKED turns off. Monitor the current waveform with the waveform measurement instrument. The output sensitivity of the device is 1 V/A. The current sensitivity can be derived from the voltage sensitivity of the waveform measurement instrument.
  • Page 47 Performing Measurements Once measurement has completed Pull the opening lever toward Opening you and remove the device lever from the conductor being measured. Disconnect the terminator from the waveform measurement instrument. Pull the connector straight out while pulling the unlock lever toward you.
  • Page 48 Performing Measurements Remove the power plug of the device from the PS-54 or the PS-52. • Grip the power supply plug’s shell (p. 25) when disconnecting it. • Do not pull on cords to disconnect them or twist the power supply plug. Unplug the PS-54 or PS-52 power cord from the electrical outlet.

  • Page 49: Specifications

    3.1 Product Specifications Accuracy and maximum rated current are guaranteed at 23°C±5°C (73°F±9°F) after the power has been on for 30 minutes. Items Model SS-520 Model SS-521 Operating 0°C to +40°C (32°F to 104°F) temperature 80% RH or less (no condensation)
  • Page 50 Product Specifications Items Model SS-520 Model SS-521 Maximum rated 5 A rms (DC, and sine wave) current Derating according to frequency (Representative characteristics: See Fig.3 and 4 (p. 50)) Note: Depending on the terminator ambient temperature and measurement conditions, an overload may be caused by internal overheating, causing the maximum rated current to be less than 5 A rms.
  • Page 51 Product Specifications Items Model SS-520 Model SS-521 Temperature ±2% rdg. or less coefficient for (After zero-adjustment with 50 Hz 5 A rms input, sensitivity except at 23°C ±5°C [73°F±9°F]) Maximum rated 3.2 VA (with continuous maximum input) power Supply voltage ±12 V±0.5 V...
  • Page 52 Product Specifications Items Model SS-520 Model SS-521 Accuracy 1 year (Opening/closing up to 10000 times) warranty period Product 1 year warranty period Cord lengths Sensor cord: 1.5 m ±0.1 m (59.06" ±3.94") Power supply cord: 1.0 m ±0.1 m (39.37" ±3.94") External Sensor: 155W ×...
  • Page 53 Product Specifications Representative characteristics 1. Frequency Characteristics 1000M Frequency [Hz] Frequency [Hz] Fig.1 Frequency characteristics (typical) (SS-520) 1000M 100k 100M Frequency[Hz] Fig.2 Frequency characteristics (typical) (SS-521)
  • Page 54 Product Specifications 2. Derating According to Frequency = 23°C, Sine wave Fig.3 Derating according to frequency (SS-520) = 23°C, Sine wave 100M Frequency [Hz] Fig.4 Derating according to frequency (SS-521)
  • Page 55 Product Specifications Reference Figures 3 and 4 (p. 50), “Derating according to frequency,” assume operation at the temperature for which accuracy is defined and with sine-wave input. If the ambient temperature (T ) rises or the current being measured contains a high-frequency component, the device’s temperature will rise, and the current value and frequency that can be continuously input will fall.
  • Page 56 (load) shown in Figures 6 and 7 below. It is especially important to take this data into account when performing high-frequency measurement. 0.01 0.001 100k 100M Frequency [Hz] Fig.6 Input impedance (typical) (SS-520) [Ω mpeda 0.01 0.001 100k 100M Frequency [Hz] Fig.7 Input impedance (typical) (SS-521)
  • Page 57 Product Specifications 5. Effect on conductor being measured (inside sensor aperture) common-mode voltage Frequency [Hz] Fig.8 Effect of common-mode voltage (typical) (SS-520/SS-521)

  • Page 58: Functions

    Functions 3.2 Functions Demagnetizing and 1. Demagnetizing and zero-adjustment • Operation: Zero-Adjustment Function Performs demagnetization and zero- adjustment. • User action: Press and hold the DEMAG/AUTO ZERO key for at least 500 ms (typical). 2. Zero-adjustment • Operation: Performs zero-adjustment. •...
  • Page 59 Functions Demagnetizing and DEMAG/AUTO ZERO • Slow flashing orange: Zero-Adjustment Function After the device is powered on, after input in excess of ratings is removed, or after demagnetization terminated abnormally • Continuous orange: During demagnetization and zero- adjustment • Off: After demagnetization and zero- adjustment Sensor head...
  • Page 60 Functions Overload detection Sampling frequency: 7.8125 kHz (typical) Confirmation cycle : 500 ms (typical) (sampling: 400 ms (typical); calculation and judgment: 100 ms (typical)) 1. Rating warning • Indicates that the maximum rated current is about to be reached. • OVERLOAD LED: Red, slow flashing •...

  • Page 61: Maintenance And Service

    Maintenance and Service WARNING • Ensure that the input does not exceed the maximum input voltage or current to avoid device damage, shortcircuiting and electric shock resulting from heat building. IMPORTANT Periodic calibration is necessary in order to ensure that the device provides correct measurement results of the specified accuracy.

  • Page 62: Troubleshooting

    4.1 Troubleshooting • If damage is suspected, check the “Before sending the device for repair” (p. 59) section before contacting your authorized IWATSU distributor or reseller. • If no waveform is displayed even after performing demagnetization and zero-adjustment (p. 37), internal damage may have occurred.
  • Page 63 Troubleshooting Before sending the device for repair Symptom Check and/or remedy • Perform demagnetization and zero- No waveform is displayed on the adjustment again. (p. 37) • Verify that the waveform measurement connected waveform instrument’s input coupling parameter measurement instrument is set to DC.
  • Page 64 Troubleshooting Symptom Check and/or remedy Demagnetization and Demagnetization and automatic zero- zero-adjustment do not adjustment cannot be performed in the complete normally. following circumstances: Repeat demagnetization and zero- adjustment (p. 37) after implementing the suggested remedy. Circumstances Remedy When the Lock the sensor UNLOCKED head.

  • Page 65: Error

    You can determine the nature of an error by observing the device’s LED. When an error occurs, deal with it as described in the following table. If the device needs to be repaired, please contact your authorized IWATSU distributor or reseller. Error State Solution...
  • Page 66 Troubleshooting Error State Solution This issue occurs when the DEMAG/ LEDs flash AUTO ZERO key is pressed under the quickly circumstances described in the table three time below. LED is Demagnetization and automatic zero- lit up adjustment cannot be performed. continuously.

  • Page 67: Cleaning

    Cleaning 4.3 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. CAUTION •...

  • Page 68: Discarding The Device

    Discarding the Device 4.4 Discarding the Device Handle and dispose of the device in accordance with local regulations.
  • Page 69 IWATSU ELECTRIC CO., LTD Contact Us Overseas Sales Sect., Sales Dept. No.2 Address : 1-7-41 Kugayama, Suginami-ku, Tokyo 168-8501, Japan Phone: +81 3 5370 5483 Facsimile : +81 3 5370 5492 Web Site : https://www.iti.iwatsu.co.jp/index_e.html E-mail : info-tme@iwatsu.co.jp Distributed by:...

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Ss-520Ss-500 series

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