INSTRUCTION MANUAL 3257-50 3257-51 DIGITAL HiTESTER
i Contents Introduction ............................................................. 1 Inspection ............................................................... 1 Safety Notes ........................................................... 2 Usage Notes ........................................................... 6 Chapter 1 Overview 1.1 1.2 1.3 Product Overview ................................... 9 Features .................................................. 9 Parts Names and Functions .................
ii Chapter 4 Specifications 4.1 4.2 General Specifications ..........................37 Accuracy ................................................41 Chapter 5 Maintenace and Service 5.1 5.2 5.3 37 45 Replacing the Batteries and Fuses ........45 Cleaning ................................................47 Service ..................................................
1 Introduction Thank you for purchasing the HIOKI "3257-50/51 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. If damage is evident, or if it fails to operate according to the specifications, contact your dealer or Hioki representative.
2 Accessories 3257-50*1 3257-51*2 • 9207-10 TEST LEAD ................ 1 • Instruction Manual ..................... 1 • R03 Manganese battery ............ 2 (Supplied with this product, for monitor) • 9378 CARRYING CASE*1 (3257-50 only) • Protective holster*2(3257-51 only) 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.
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 The following symbols in this manual indicate the relative importance of cautions and warnings. Indicates that incorrect operation presents an extreme hazard that could result in serious injury or death to the user. Indicates that incorrect operation presents a significant hazard that could result in serious injury or death to the user. Indicates that incorrect operation presents a possibility of injury to the user or damage to the product.
5 Measurement categories (Overvoltage categories) This product complies with CATIII (1000 V), CATIV (600 V) safety requirements. 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. Secondary electrical circuits connected to an AC elecCAT I trical outlet through a transformer or similar device.
6 Usage Notes Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions. • To avoid electric shock, do not allow the product to get wet, and do not use it when your hands are wet. • Do not use the product where it may be exposed to corrosive or combustible gases. The product may be damaged or cause an explosion.
7 Direct sunlight High temperature, high humidity, dust Electromagnetic radiation Impact, dropping 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.
8 • Accurate measurement may be impossible in the presence of strong magnetic fields, such as near transformers and high-current conductors, or in the presence of strong electromagnetic fields such as near radio transmitters. • To avoid battery depletion, turn the function selector OFF after use (the Auto Power Save feature consumes a small amount of current). • The indicator appears when battery voltage becomes low. Replace the batteries as soon as possible.
1.1 Product Overview Overview 9 Chapter 1 1.1 Product Overview This measurement product is a multi-functional digital multimeter capable of measuring DC and AC voltages, DC and AC currents, the resistance, and the duty factor, and checking the diode and continuity. Since a true RMS measurement system is used, the measurement product can accurately measure even distorted waveforms. 1.
10 1.3 Parts Names and Functions 1.3 Parts Names and Functions *: for details, see the following pages LCD display * REC•MEMO Button (Press this button to change to the function indicated in blue.) For other functions, see the following pages. H.AUTO/REL Button * RANGE Button * Function Selector (Selects functions and turns the power on/off) V.Ω terminal Terminal used to measure voltages and resistances (red test lead) A terminal Terminal used to measure currents in 10-A mode COM terminal μA.
1.
12 1.3 Parts Names and Functions Function Selector Press REC•MEMO when the function in parentheses is being (Diode Check function) used.
1.3 Parts Names and Functions Frequency V Duty factor V REC•MEMO ) 18 Measurement 25 (1-4) REC•MEMO ×2 RANGE ( Measurement RANGE "Hz" lights up (1-4) 13 Quick Reference (application) Example : Turn on the power while pressing the button (hold the button down until a beeping sound is generated). <1 second: Press the button for at least 1 second. REC•MEMO :Button REC•MEMO Hold the measured value.
14 1.3 Parts Names and Functions Cancel the Auto-Power Save function. (Auto-Power Save function) V/ V/Hz/ Press this button until a REC•MEMO beeping sound is generated. / /Ω/ / 40μA/μA/mA/ Enable the Power Save function: 32 10A OFF Function change ("APS" Power Save lights up) After 10 minutes mode Check the maximum, minimum, and average values during measurement. (Recording function) V/ V/Ω/ 40μA/μA/mA/ 10A REC•MEMO ("MAX MIN AVG" H.
1.3 Parts Names and Functions Measurement Procedures 15 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.
16 2.1 Voltage Measurement 2.1 Voltage Measurement • The maximum input voltage is 1000 VDC, 1000 Vrms, or 107V•Hz. Attempting to measure voltage in excess of the maximum input could destroy the product and result in personal injure or death. • To avoid electrical shock, be careful to avoid shorting live lines with the test leads. • For safety, test lead connections must always be made at the secondary side of a circuit breaker.
2.1 Voltage Measurement AC Voltage Measurement 3. 17 Connect the test leads to the measurement object, and read the indicated value. Black Red DC Voltage Measurement Black Red Selecting the manual range: Reselecting the auto range: Press RANGE ("AUTO" is turned off) Press RANGE (for at least 1 second) ("AUTO" lights up) Holding the measured value: (HOLD AUTO Function: page 27) or (HOLD Function: page 28) Press H.
18 2.2 Frequency Measurement 2.2 Frequency Measurement • The maximum input voltage is 1000 VDC, 1000 Vrms, or 107V•Hz. Attempting to measure voltage in excess of the maximum input could destroy the product and result in personal injure or death. • For safety, test lead connections must always be made at the secondary side of a circuit breaker. 1. 2. REC•MEMO 3. 4. RANGE Move the function selector to the V position and press the REC•MEMO button ("Hz" lights up). Connect the red test lead to terminal V.
2.3 Current Measurement 19 2.3 Current Measurement • Never apply voltage to the test leads when a current measurement function is selected. Doing so may damage the product and result in personal injury. • To avoid electrical accidents, remove power from the circuit before connecting the test leads. • To avoid electrical shock, do not use the product to measure current in circuits of 1000 V or greater. The current function overload protection trips at 1000 VDC, 1000 Vrms.
20 2.3 Current Measurement 40μA Measurement (42μA range) REC•MEMO Black 1. Move the function selector to the 40μA position. 2. Select DC ( ) or AC ( the REC•MEMO button. 3. Connect the red test lead to terminal μA.mA, and the black test lead to terminal COM. 4. Connect the test leads to the measurement object, and read the indicated value. The Auto Range function is not provided. Red ) using μA Measurement (420 μA/4200 μA range) REC•MEMO Black Red 1.
2.3 Current Measurement 21 mA Measurement (40 mA/400 mA range) REC•MEMO Black Red 1. Move the function selector to the mA position. 2. Select DC ( ) or AC ( the REC•MEMO button. 3. Connect the red test lead to terminal μA.mA, and the black test lead to terminal COM. 4. Connect the test leads to the measurement object, and read the indicated value.
22 2.4 Resistance Measurement 2.4 Resistance Measurement • Never apply voltage to 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. 1. Move the function selector to the Ω position. 2. Connect the red test lead to terminal V.Ω, and the black test lead to terminal COM. 3. Connect the test leads to the measurement object, and read the indicated value.
2.5 Continuity Check 23 2.5 Continuity Check • Never apply voltage to test leads when the Continuity 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. 1. 2. REC•MEMO Move the function selector to the position. Select Diode ( ) using the REC•MEMO button ( lights up). 3. Connect the red test lead to terminal V.Ω, and the black test lead to terminal COM. 4.
24 2.6 Diode Check 2.6 Diode Check • Never apply voltage to 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. 1. 2. REC•MEMO 3. Connect the red test lead to terminal V.Ω, and the black test lead to terminal COM. 4. Connect the test leads to the measurement object.
25 2.7 Duty Factor Measurement 2.7 Duty Factor Measurement • The maximum input voltage is 1000 VDC, 1000 Vrms, or 107V•Hz. Attempting to measure voltage in excess of the maximum input could destroy the product and result in personal injure or death. • For safety, test lead connections must always be made at the secondary side of a circuit breaker. The duty factor indicates the ratio between the pulse width and the pulse period. The 3257-50/51 displays this ratio as a percentage.
26 2.7 Duty Factor Measurement 1. Move the function selector to the V position, and press the REC•MEMO button twice ( lights up, indicating that a positive slope is being measured). To measure a negative slope, press the REC•MEMO button again ( lights up). 2. Connect the red test lead to terminal V.Ω, and the black test lead to terminal COM. 3. Select the input level (1 to 4) using the RANGE button, in accordance with the input voltage. 4.
3.1 HOLD AUTO Function Additional Functions 27 Chapter 3 3.1 HOLD AUTO Function Functions V/ Description 1. H.AUTO/REL 2. HOLD (blinks) Measure 3. HOLD (lights up) Select the desired function and connect the test leads to the measurement product. Press the H.AUTO/REL button. ("HOLD" blinks) (In the measurement of resistance, O.F is displayed.) Connect the test leads to the measurement object. After the measured value is stabilized, an intermittent sound is generated.
28 3.2 HOLD Function 3.2 HOLD Function Functions Description V/ V/Hz/ /Ω/ / /40μA/μA/mA/10A This function holds the currently measured value. H.AUTO/REL 1. Turn on the power while pressing the H.AUTO/REL button, and hold the button down until a beeping sound is generated (toggle the function selector to the desired position). 2. Press the H.AUTO/REL button again at the measured value to be held. The value is held. Measure Displayed value H.AUTO/REL HOLD lights up The measured value is held.
3.3 Overflow Warning Function 29 3.3 Overflow Warning Function Functions Description V/ V/40μA/μA/mA/10A When the measured value exceeds the maximum indication (4200 counts), O.F is displayed and an intermittent sound is generated. When the measured value exceeds 1050 counts in the ranges specified below, O.F is displayed and an intermittent sound is generated.
30 3.4 Relative Display Function 3.4 Relative Display Function Functions Description V/ V/Ω/40μA/μA/mA/10A Once an arbitrary value is specified as a reference, the relative value against the reference is displayed. This function is useful to check any discrepancy from the reference. Checking any discrepancy from the reference (when 10 V is defined as the reference in the voltage measurement) Measure a voltage of 10 V 1. 2. H.AUTO/REL The manual for at least range is 1 second enabled. 3.
3.4 Relative Display Function 31 Application: Using the Relative Display function for the purpose of zero adjustment in the measurement of low resistances Short-circuit the test leads 1. 2. Move the function selector to the Ω position and connect the test leads to the equipment. Short-circuit the test leads. The resistance of the test leads is displayed. 3. Press the H.AUTO/REL button for at least 1 second. ("REL" lights up, "0000") 4.
32 3.5 Auto Power Save Function 3.5 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.
3.6 Dynamic Recording Function 33 3.6 Dynamic Recording Function Functions Description V/ V/Ω/40μA/μA/mA/10A This function allows the maximum (MAX), minimum (MIN), average (AVG), and currently measured values to be displayed selectively. It is useful for measuring any discrepancy over an extended period. 1. REC•MEMO Press for at least 1 second. Current value 2. 3. Maximum value Minimum value Average value H.
34 3.7 Memory Function 3.7 Memory Function Saving data to memory Functions Description REC•MEMO V/ V/Ω/40μA/μA/mA/10A This function memorizes the measured value held using the Hold Auto or Hold function. 1. Hold the measured value using the Hold Auto or Hold function. 2. Press the REC•MEMO button in hold mode. The value displayed is saved in memory of the number specified. Wait a moment for current value display on the LCD. Up to 20 values can be saved. Memory numbers cannot be specified.
3.7 Memory Function 35 Calling data from memory Call data from memory as specified below. 1. RANGE Turn on the power while pressing the RANGE button. Move the function selector to the V position (hold the button down until a beeping sound is generated). 2. When there is no data in memory RANGE Press the RANGE button to select the memory number. The saved data is displayed on the LCD. Deleting all data from memory Delete all data from memory as specified below.
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4.1 General Specifications Specifications 37 Chapter 4 4.
38 4.1 General Specifications Input Terminals V.Ω terminal (V, Hz, Ω, continuity, diode) μA.mA/ A/ COM terminals Equipped with terminal shutter to prevent improper operation. Function Selector Rotary selector Range Switching Auto/Manual Range Sampling Rate 2.5 S/s (except Frequency), 5 S/s (Frequency), 25 S/s (Update of bar graph) Power Supply Two manganese (R03) batteries or two alkaline (LR03) batteries Rated supply voltage: 1.5 VDC × 2 Battery-Life Warning indicates low battery (2.2 V±0.
4.1 General Specifications 39 Operating Environ- Indoors, altitude up to 2000 m (6562-ft.) ment Operating Temper- 0 to 50°C (32 to 122°F), at 80%RH or less ature & Humidity (non-condensating) Storage Tempera- -20 to 60°C (-4 to 140°F), at 70%RH or ture & Humidity less (non-condensating) Temperature Characteristic (Measurement accuracy) × 0.1/°C (except 23±5°C) Size & Weight Approx. 76W × 167H × 33D mm (2.99"W × 6.57"H × 1.30"D) (without protrusions) Approx. 260 g (9.
40 4.1 General Specifications Protective Fuse 10A terminal: DMM-11 (made by Cooper Bussmann*) Rating 11A/1000V(AC/DC) Fast-Acting Breaking capacity: 17 kA/1000 VAC, 10 kA/1000 VDC μAmA terminal: DMM-44/100 (made by Cooper Bussmann*) Rating 0.44 A/1000 V(AC/DC) Fast-Acting Breaking capacity: 10 kA *Cooper Industries Inc.
41 4.2 Accuracy 4.2 Accuracy Accuracy guarantee for 23±5°C(73±9°F), 80%RH or less temperature and humidity Guaranteed accuracy 1 year period Regulated power supply range 3.4 V or lower (until the lights up) mark (rdg.: displayed value, dgt.: resolution) Voltage Measurement Range [V] V V *1 Accuracy ±(rdg.)±(dgt.) Input Impedance (Frequency range) 420.0 m 4.200 42.00 420.0 1000 ±0.5%±2 ±0.5%±2 ±0.5%±2 ±0.5%±2 ±0.5%±2 100 MΩ or more Approx. 11MΩ Approx. 10MΩ Approx. 10MΩ Approx. 10MΩ 420.0 m 4.
42 4.2 Accuracy (rdg.: displayed value, dgt.: resolution) Frequency Measurement Range [Hz] Hz *1 199.99 1999.9 19.999k 199.99k 500.0k Accuracy ±(rdg.)±(dgt.) ±0.02%±2 ±0.02%±1 ±0.02%±1 ±0.02%±1 ±0.02%±1 Input level (Range) 1: 0.8 to 4 V 2: 4 to 40 V 3: 40 to 400 V 4: 400 to 1000 V (4.200V) (42.00V) (420.0V) (1000V) Overload protection (for one minute): 1000 VDC, 1000 Vrms(sin), or 107V•Hz *1: Frequencies of less than 0.50 Hz cannot be measured.
4.2 Accuracy 43 (rdg.: displayed value, dgt.: resolution) Current Measurement Range [A] A A *1 Accuracy ±(rdg.)±(dgt.) Input Impedance (Shunt resistance) 42.00μ 420.0μ 4200μ 42.00m 420.0m 10.00*2 ±1.5%±4 ±1.5%±4 ±1.5%±4 ±1.5%±4 ±1.5%±4 ±1.5%±4 Approx. 10kΩ Approx. 100Ω Approx. 100Ω Approx. 1Ω Approx. 1Ω Approx. 0.01Ω 42.00μ 420.0μ 4200μ 42.00m 420.0m 10.00*2 ±2.5%±5 ±2.5%±5 ±2.5%±5 ±2.5%±5 ±2.5%±5 ±2.5%±5 Approx. 10kΩ Approx. 100Ω Approx. 100Ω Approx. 1Ω Approx. 1Ω Approx. 0.
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5.1 Replacing the Batteries and Fuses Maintenace and Service 45 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. • Do not mix old and new batteries, or different types of batteries. Also, be careful to observe battery polarity during installation.
46 5.1 Replacing the Batteries and Fuses A fuse is mounted to the μA.mA and A terminals in order to protect the circuit. If the current cannot be measured, the fuse may have blown due to overcurrent. Replace the fuse or battery in accordance with the procedure specified below. Lower case Necessary tool: Phillips screwdriver 1. 2. Upper case 3. 4. 5. μA.mA terminal 10A terminal Disconnect the test leads from the measurement circuit, and make sure the function selector is in the OFF position.
5.2 Cleaning 47 5.2 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. 5.3 Service • If the product seems to be malfunctioning, confirm that the batteries are not discharged, and that the test leads and fuse are not open circuited before contacting your dealer or Hioki representative.
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HIOKI 3257-50,-51 DIGITAL HiTESTER Instruction Manual Publication date: September 2006 Revised edition 4 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.
