INSTRUCTION MANUAL 3255-50 DIGITAL HiTESTER
i Contents Contents Introduction ............................................................... 1 Inspection.................................................................. 1 Safety Notes ............................................................. 2 Usage Notes ............................................................. 6 Chapter 1 1.1 1.2 1.3 3.2 3.3 3.4 Measurement Procedures 17 Connection ................................................ 17 Voltage Measurement ...............................
ii Contents Chapter 4 4.1 4.2 33 General Specifications .............................. 33 Accuracy ................................................... 37 Chapter 5 5.1 5.2 5.3 Specifications Maintenace and Service 39 Replacing the Batteries and Fuses ........... 39 Cleaning and Storage ............................... 42 Service ......................................................
Introduction 1 Introduction Thank you for purchasing the HIOKI "3255-50 DIGITAL HiTESTER." To obtain maximum performance from the product, please read this manual first, and keep it handy for future reference. Inspection When you receive the product, inspect it carefully to ensure that no damage occurred during shipping. In particular, check the accessories, panel switches, and connectors.
2 Safety Notes Safety Notes This manual contains information and warnings essential for safe operation of the product and for maintaining it in safe operating condition. Before using the product, be sure to carefully read the following safety notes. This product is designed to conform to IEC 61010 Safety Standards, and has been thoroughly tested for safety prior to shipment. However, mishandling during use could result in injury or death, as well as damage to the product.
Safety Notes 3 Safety Symbols In the manual, the symbol indicates particularly important information that the user should read before using the product. The symbol printed on the product indicates that the user should refer to a corresponding topic in the manual (marked with the symbol) before using the relevant function. Indicates that dangerous voltage may be present at this terminal. Indicates a double-insulated device. Indicates a grounding terminal. Indicates DC (Direct Current).
4 Safety Notes Other Symbols Indicates the prohibited action Accuracy We define measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt. (digit) values, with the following meanings: f.s. (maximum display value or scale length) The maximum displayable value or the full length of the scale. This is usually the maximum value of the currently selected range. rdg. (reading or displayed value) The value currently being measured and indicated on the measuring product. dgt.
Safety Notes 5 Measurement categories (Overvoltage categories) This product conforms to the safety requirements for CAT III 600V, CAT II 1000V measurement products. To ensure safe operation of measurement products, IEC 61010 establishes safety standards for various electrical environments, categorized as CAT I to CAT IV, and called measurement categories. These are defined as follows. CAT I: Secondary electrical circuits connected to an AC electrical outlet through a transformer or similar device.
6 Usage Notes Usage Notes Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions. Inspection before Use • Before using the product the first time, verify that it operates normally to ensure that the no damage occurred during storage or shipping. If you find any damage, contact your dealer or Hioki representative. • Before using the product, make sure that the insulation on the test leads is undamaged and that no bare conductors are improperly exposed.
Usage Notes 7 Observe the following to avoid damage to the product. • Installation and Operating Environment Between 0°C and 40°C; 80% RH or less; indoors only. However, it can be safely operated at as low as -10°C. • Do not store or use the product where it could be exposed to direct sunlight, high temperature or humidity, or condensation. Under such conditions, the product may be damaged and insulation may deteriorate so that it no longer meets specifications.
8 Usage Notes • Adjustments and repairs should be made only by technically qualified personnel. • If the protective functions of the product are damaged, either remove it from service or mark it clearly so that others do not use it inadvertently. • To avoid corrosion from battery leakage, remove the batteries from the product if it is to be stored for a long time.
Usage Notes 9 Connection and Measurement For other precautions and details, see explanations of the measurement procedures. Use only the specified test lead or clamp-on probe. Using a non-specified cable may result in incorrect measurements due to poor connection or other reasons. When measuring a breaker This product should only be connected to the secondary side of a breaker, so the breaker can prevent an accident if a short circuit occurs.
10 Usage Notes Resistance Measurement, Checking the Continuity or Diode Never apply voltage to test leads when the Resistance, Continuity or Diode Check functions are selected. Doing so may damage the product and result in personal injury. To avoid electrical accidents, remove power from the circuit before measuring. Current Measurement (When using the optional Clamp-on Probe) Connect the Clamp-on probe to the product first, and then to the active lines to be measured.
Usage Notes 11 • To prevent damage to the product and Clampon probe, never connect or disconnect a sensor while the power is on. • Be careful to avoid dropping the Clamp-on probe or otherwise subjecting them to mechanical shock, which could damage the mating surfaces of the core and adversely affect measurement. • Keep the clamp jaws and core slits free from foreign objects, which could interfere with clamping action.
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1.1 Product Overview Overview 13 Chapter 1 1.1 Product Overview This measurement product is a multi-functional digital multimeter capable of measuring DC and AC voltages, AC currents, and the resistance, and checking the diode and continuity. 1.2 Features Compliance with CE marking requirements The measurement product is designed to comply with the international safety standard (IEC61010) and EMC standards.
14 1.3 Parts Names and Functions 1.3 Parts Names and Functions LCD Display (page 15) SHIFT Button (page 15) RANGE Button (page 15) Function Selector Selects functions V, mV Voltage measurement CLAMP Current measurement Resistance measurement Continuity checking Diode checking + Terminal Red COM Terminal Black Turns the power on/off When the switch is rotated clockwise from the OFF position, the power is turned on. Connect the 9207-10 TEST LEAD or optional Clamp-on probes.
1.3 Parts Names and Functions 15 LCD Display Indicates Auto Power Save is enable Indicates Autoranging Indicates diode check function function Indicates continuity check Indicates HOLD AUTO function function is enable.
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2.1 Connection Measurement Procedures 17 Chapter 2 Observe the following precautions to avoid electric shock. • Always verify the appropriate setting of the function selector before connecting the test leads. • Disconnect the test leads from the measurement object before switching the function selector. 2.1 Connection Voltage measurement/ Resistance measurement/ Continuity check/ Diode check Safety cap 1. Remove the protective cap from the test lead supplied with the product. 2.
18 2.1 Connection Current measurement To perform measurement, an optional Clamp-on probe is required. Connect the red plug of the Clamp-on probe to terminal +, and the black plug to terminal COM. Connect the plug to the terminals securely.
2.2 Voltage Measurement 19 2.2 Voltage Measurement • The maximum input voltage is 1000 VDC,1000 Vrms(sin), or 107V•Hz. Attempting to measure voltage in excess of the maximum input could destroy the product and result in personal injury or death.
20 2.2 Voltage Measurement V measurement mV measurement 1. 2. AC Voltage Measurement DC Voltage Measurement 3. Example Move the function selector to the V or mV position ("V" or "mV" lights up, lights up). If you are not sure of the approximate voltage level, select V first. When DC voltage measurement, press the SHIFT button. ( lights up) Connect the test leads to the measurement object, and read the indicated value. Example Black Red Red Black Selecting the manual range ...
2.3 Current Measurement 21 2.3 Current Measurement To perform measurement, an optional Clamp-on probe is required. Connect the Clamp-on probes to the product first, and then to the active lines to be measured. Observe the following to avoid electric shock and short circuits. • To avoid short circuits and potentially lifethreatening hazards, never attach the Clamp-on probe to a circuit that operates at more than 600 V, or over bare conductors.
22 2.3 Current Measurement • To prevent damage to the product and sensor, never connect or disconnect a probe while the power is on. • Check the position of the range switch of the Clamp-on probe before taking measurements. • Make sure the range setting of the product is the same as that of the Clamp-on probe before starting measurement. If the ranges differ, an accurate current measurement will not be displayed. • Attach the clamp around only one conductor.
2.3 Current Measurement 1. Move the function selector to the CLAMP position. ( lights up) 2. Set the measurement range of the Clamp-on probe (option). If you are not sure of the level of the current to be measured, select a large range. 3. Press the RANGE button and select the same range as that of the Clamp-on probe. The Auto Range function is not available for current measurement.
24 2.4 Resistance Measurement 2.4 Resistance Measurement • Never apply voltage to the test leads when the Resistance function is selected. Doing so may damage the product and result in personal injury. • To avoid electrical accidents, remove power from the circuit before measuring. Black 1. Move the function selector to the Ω position. ( lights up) 2. Connect the test leads to the measurement object, and read the indicated value. Red Selecting the manual range ...
2.5 Continuity Check 25 2.5 Continuity Check • Never apply voltage to the test leads when the Continuity check function is selected. Doing so may damage the product and result in personal injury. • To avoid electrical accidents, remove power from the circuit before measuring. Black Red 1. Move the function selector to the Ω position. 2. Select Continuity check function ( ) using the SHIFT button ( lights up). 3. Connect the test leads to the measurement object.
26 2.6 Diode Check 2.6 Diode Check • Never apply voltage to the test leads when the Diode Check function is selected. Doing so may damage the product and result in personal injury. • To avoid electrical accidents, remove power from the circuit before measuring. Cathode Anode Move the function selector to the Ω position. 2. Select Diode check function ( ) pressing the SHIFT button twice ( lights up). 3. Connect the test leads to the measurement object. The display shows forward voltage (0.15 V to 2.
3.1 Auto Range Function and Manual Range Additional Functions 27 Chapter 3 3.1 Auto Range Function and Manual Range Function Functions Auto range function: V/ Manual range function: V/ / CLAMP Auto range function _______________________ The Autoranging function automatically selects the optimum measurement range. Turning on the power also switches Autoranging on (AUTO lights up).
28 3.1 Auto Range Function and Manual Range Manual range function ____________________ Press the RANGE button to active the manual range function (AUTO is turned off). Only Manual Range is available for current measurement (CLAMP). Range selection: V/ Ω Each pressing of the RANGE button selects the next larger range. After the largest range, pressing the select button again returns you to the smallest range. CLAMP Each pressing of the RANGE button selects the next smaller range.
3.2 HOLD AUTO Function 29 3.2 HOLD AUTO Function Functions V/ mV/ Description Simply moving the test leads away from the measurement object holds the measured value. This function is useful when it is difficult to read the displayed value in the current location or both hands are being used to conduct the measurement. (example: ) 1. 2. HOLD (blinks) 3. HOLD (lights up) Beeping sound HOLD (blinks) 4. Move the function selector to the desired position. Press the SHIFT button.
30 3.3 Overflow Warning Function 3.3 Overflow Warning Function Functions V/ mV/ CLAMP Description When the measured value exceeds the maximum indication (4199 counts), O.F is displayed and an intermittent sound is generated. O.F is displayed and an intermittent sound is generated also in the cases described below. Range Voltage 1000 V measurement Maximum O.
3.4 Auto Power Save Function 31 3.4 Auto Power Save Function Functions All functions Description Approximately 10 minutes after completing final operation, the measurement product automatically enters Power Save mode. When the measurement product is turned on, it automatically enters Auto Power Save mode (APS lights up). • In Power Save mode, the LCD is blank but power is supplied to the measurement product.
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4.1 General Specifications 33 Chapter 4 Specifications 4.
34 4.1 General Specifications General Range switching Auto/Manual Range Sampling rate 2.5 S/s Input terminals +(V, Ω, continuity, diode) terminal COM terminal Functions OFF/ V/ mV/ CLAMP/ Ω Buttons SHIFT, RANGE Power supply Two manganese (R03) batteries or two alkaline (LR03) batteries Battery-life warning indicates low battery (2.3 V±0.15 V or less) Dimensions Approx.70W × 145H × 31D mm (2.76"W × 5.71"H × 1.22"D) (without protrusions) Mass Approx. 210 g (7.
4.1 General Specifications 35 Applicable Standards Safety EN61010-1:2001 EN61010-031:2002 Pollution Degree 2 Measurement Category CAT III 600 V, CAT II 1000 V (Anticipated Transient Overvoltage: 6000 V) EMC EN61326:1997+A1:1998+A2:2001 +A3:2003 Dustproof and waterproof EN60529:1991 IP54 Electrical Characteristics Measurement accuracy See accuracy table (page 37) Accuracy guarantee for temperature and humidity 23°C±5°C (73°F±9°F), 80%RH or less (non-condensating) Regulated power supply range 3.
36 4.1 General Specifications Electrical Characteristics Rated power supply voltage 3.0 VDC Maximum rated power 12 mVA (Max) (supply voltage 3.0 VDC) Rated power 4 mVA (Typ) (supply voltage 3.0 VDC, in DCV mode) 0.1 mVA (Max) Power during auto (supply voltage 3.0 VDC, during Auto power saving Power Saving) Continuous operating time Approx. 200 hours (in DCV mode, with R03 manganese batteries) Approx.
4.2 Accuracy 37 4.2 Accuracy Accuracy Table (Accuracy guaranteed for one year at 23°C±5°C (73°F±9°F), 80%RH or less.) (rdg.: displayed value, dgt.: resolution) Voltage Measurement Range [V] mV V mV V Accuracy ±(rdg.)±(dgt.) Input Impedance (Frequency range) 420.0 m 4.200 42.00 420.0 1000 ±1.0%±4 ±1.0%±4 ±0.5%±4 ±0.7%±4 ±0.7%±4 Approx.10 MΩ Approx.11 MΩ Approx.10 MΩ Approx.10 MΩ Approx.10 MΩ 420.0 m 4.200 42.00 420.0 1000 ±2.0%±4 ±2.0%±4 ±1.2%±4 ±1.5%±4 ±1.5%±4 (50 to 500 Hz) Approx.
38 4.2 Accuracy (rdg.: displayed value, dgt.: resolution) Current Measurement (3255-50 only. For accuracy of the combination of the Clamp-on probe and the 3255-50, add the measurement accuracy of the clamp-on probe) Range [A] 10.00 CLAMP 20.00 50.0 100.0 200.0 (ACA) 500 1000 Accuracy ±(rdg.)±(dgt.) ±2.0%±4 ±2.0%±4 ±2.0%±4 ±2.0%±4 ±2.0%±4 ±2.0%±4 ±2.0%±4 Input Impedance (Frequency range) Approx.
5.1 Replacing the Batteries and Fuses Maintenace and Service 39 Chapter 5 5.1 Replacing the Batteries and Fuses • To avoid electric shock when replacing the batteries and fuses, first disconnect the test leads from the object to be measured. • Before using the product after replacing the batteries or fuses, replace the cover and screw. Replacing the Batteries • Do not mix old and new batteries, or different types of batteries. Also, be careful to observe battery polarity during installation.
40 5.1 Replacing the Batteries and Fuses Replacing the Fuses Replace the fuse only with one of the specified characteristics and voltage and current ratings. Using a non-specified fuse or shorting the fuse holder may cause a life-threatening hazard. Fuse type: Model DMM-44/100, Fast-acting, Rating: 0.44 A/1000 V (AC/DC), Breaking capacity: 10 kA (made by Cooper Bussmann) Be careful not to damage the circuit board or case when changing fuses.
5.1 Replacing the Batteries and Fuses 41 Necessary tool: Phillips screwdriver 1. Rear case 2. 3. Front case Front case Rear case 4. Fuse Batteries 5. Disconnect the test leads from the measurement circuit, and make sure the function selector is in the OFF position. Turn the 3255-50 over and use a Phillips screwdriver to remove the one retaining screw. Lift and remove the rear case. Replace the two manganese batteries (R03) mounted to the rear case, or the fuse mounted to the front case.
42 5.2 Cleaning and Storage 5.2 Cleaning and Storage Cleaning ________________________________ • To clean the product, wipe it gently with a soft cloth moistened with water or mild detergent. Never use solvents such as benzene, alcohol, acetone, ether, ketones, thinners or gasoline, as they can deform and discolor the case. • Wipe the LCD gently with a soft, dry cloth.
5.3 Service 43 5.3 Service • Adjustments and repairs should be made only by technically qualified personnel. • If the product seems to be malfunctioning, confirm that the batteries are not discharged, and that the test leads, clamp-on probes, and fuse are not open circuited before contacting your dealer or Hioki representative. • When sending the product for repair, remove the batteries and pack carefully to prevent damage in transit.
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HIOKI 3255-50 DIGITAL HiTESTER Instruction Manual Publication date: September 2006 Revised edition 1 Edited and published by HIOKI E.E. CORPORATION Technical Support Section All inquiries to International Sales and Marketing Department 81 Koizumi, Ueda, Nagano, 386-1192, Japan TEL: +81-268-28-0562 / FAX: +81-268-28-0568 E-mail: os-com@hioki.co.jp URL http://www.hioki.co.
HEAD OFFICE 81 Koizumi, Ueda, Nagano 386-1192, Japan TEL +81-268-28-0562 / FAX +81-268-28-0568 E-mail: os-com@hioki.co.jp URL http://www.hioki.co.
