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3257 DIGITAL HiTESTER INSTRUCTION MANUAL...
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Contents Introduction Inspection Safety Notes Notes on Use Chapter 1 Names and Functions of parts Chapter 2 Measurement Procedures 2.1 Voltage Measurement 2.2 Frequency Measurement 2.3 Duty Factor Measurement 2.4 Current Measurement 2.5 Resistance Measurement 2.6 Continuity Checking 2.7 Diode Check 2.8 HOLD.Auto Function 2.9 Overvoltage warning function 2.10 Relative (Relative display) function 2.11 Auto Power Save Function...
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Chapter 4 Maintenance and Service 4.1 Changing the Batteries and Fuses 4.2 Service 4.3 Cleaning...
――――――――――――――――――――――――――― Introduction Thank you for purchasing this HIOKI "3257 DIGITAL HiTESTER." To get the maximum performance from the unit, please read this manual first, and keep this at hand. Inspection When the unit is delivered, check and make sure that it has not been damaged in transit.
――――――――――――――――――――――――――― Safety Notes WARNING This equipment is designed to according to IEC 61010-1 Safety Standards, and has been tested for safety prior to shipment. During high voltage measurement, incorrect measurement procedures could result in injury or death, as well as damage to the equipment. Please read this manual carefully and be sure that you understand its contents before using the equipment.
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――――――――――――――――――――――――――― This Instruction Manual provides information and warnings essential for operating this equipment in a safe manner and for maintaining it in safe operating condition. Before using this equipment, be sure to carefully read the following safety notes. Safety symbols ・...
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――――――――――――――――――――――――――― The following symbols are used in this Instruction Manual to indicate the relative importance of cautions and warnings. Indicates that incorrect operation presents extreme danger of accident DANGER resulting in death or serious injury to the user. Indicates that incorrect operation presents significant danger of accident WARNING resulting in death or serious injury to...
――――――――――――――――――――――――――― Notes on Use In order to ensure safe operation and to obtain maximum performance from the unit, observe the cautions listed below. DANGER Before taking a measurement, check the position of the function switch. Do not measure voltage outside the set voltage range. Doing so may damage the unit or cause an accident that might result in injury or death.
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――――――――――――――――――――――――――― WARNING To prevent electric shock, do not allow the unit to become wet and do not use the unit when your hands are wet. Do not attempt to adjust or repair the unit with the case open and with voltage being generated and input.
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――――――――――――――――――――――――――― CAUTION ・ Do not store or use the unit where it will be exposed to direct sunlight, high temperatures, high humidity, or condensation. If exposed to such conditions, the unit may be damaged, the insulation may deteriorate, and the unit may no longer satisfy its specifications.
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viii ――――――――――――――――――――――――――― ―――――――――――――――――――――――― Notes on Use...
――――――――――――――――――――――――――― Chapter 1 Names and Functions of parts LCD Display SHIFT/H.AUTO Key RANGE Key REL key Function Switch V, Ω Terminal COM Terminal A Terminal μA, mA Terminal ―――――――――――――――――――――――― Chapter 1 Names and Functions of parts...
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――――――――――――――――――――――――――― Function Switch Selects functions, and turns the unit on and off. AC voltage, Frequency and Duty V, Hz/ factor DC voltage Ω Resistance Continuity check/Diode check 50μA 50μA DC /AC μA 500μA, 5000μA DC /AC 50 mA, 500 mA DC /AC 10 A DC /AC SHIFT / H.AUTO Key V, Hz/...
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――――――――――――――――――――――――――― With /〜 A function, switches between DC and AC. ・ Disables the Auto Power Save function. (See "Auto Power Save") ・ Starts and disables the HOLD.Auto function. (See "HOLD.Auto Function") RANGE Key ・ Switches between Auto Range and Manual Range.
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NOTE the function switch to avoid misoperation. When operating the function switch leaving the test lead connected to the terminal, there is a risk of damage to the 3257. LCD Display Decimal point ・ Lights during VDC, 50 μADC, μADC, mADC and ADC measurement.
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――――――――――――――――――――――――――― Indicates the units during voltage measurement or diode checking μmA Indicates the units during current measurement Lights during duty factor measurement (plus side slope) Lights during duty factor measurement (minus side slope) Indicates the unit during duty factor measurement Bar Graph Scale display 56 dots bar graph display (with polarity indication) ――――――――――――――――――――――――...
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――――――――――――――――――――――――――― ―――――――――――――――――――――――― Chapter 1 Names and Functions of parts...
――――――――――――――――――――――――――― Chapter 2 Measurement Procedures WARNING Even when the shutter is closed, there insulating clearance around the terminals is not safe. Be careful when connecting test leads. The changing of the function switch when replacing the test terminals requires disconnection of the test leads from the item being measured and then the disconnection of the test leads from the terminals.
――――――――――――――――――――――――――― 2.1 Voltage Measurement DANGER The maximum allowable input is 1000 VDC, 750 7 Vrms, or 10 V・Hz. Do not measure voltage in excess of these limitations, as doing so may damage the unit or cause an accident that might result in injury or death.
――――――――――――――――――――――――――― 2.2 Frequency Measurement DANGER The maximum allowable input is 1000 VDC, 750 7 Vrms, or 10 V・Hz. Do not measure voltage in excess of these limitations, as doing so may damage the unit or cause an accident that might result in injury or death.
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――――――――――――――――――――――――――― ・ Select suitable attenuators referring to the NOTE following list. But only the Auto Range is available for the frequency range. ・ For frequency measurement, the bar graph gives the attenuator condition. (Scale number in the bar graph is equivalent n...
――――――――――――――――――――――――――― 2.3 Duty Factor Measurement DANGER The maximum allowable input is 1000 VDC, 750 7 Vrms, or 10 V・Hz. Do not measure voltage in excess of these limitations, as doing so may damage the unit or cause an accident that might result in injury or death.
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■ About Duty Factor measurement Duty Factor shows the ratio between pulse width and pulse period. 3257 displays this ratio by percentage. In the square wave shown in the figure below, tw and tw are the pulse width (plus and minus side slope, respectively) and T is the pulse period.
――――――――――――――――――――――――――― 2.4 Current Measurement DANGER Do not use the tester to measure current when the electric potential is 600 V or greater. The current function overload protection trips at either 600 VDC, 600 Vrms. To prevent electrical accidents, turn the power off before connecting the test leads and then take measurements.
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――――――――――――――――――――――――――― ■ Microamp Measurement (500 μA, 5000 μA,) 1. Set the function switch to μA. 2. Connect the red test lead to the μA terminal, and the black to the COM terminal. 3. Use the SHIFT/H.AUTO key to select DC or 4.
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――――――――――――――――――――――――――― ■ Amp Measurement (10 A) WARNING In the 10 A range, the maximum allowable input is 10 A in both rms and DC. In the 10 A range, the measuring time is continuous up to 7 A, and one minute or less from 7 A to 10 A.
――――――――――――――――――――――――――― 2.5 Resistance Measurement DANGER Do not input voltage to the resistance measurement function. Doing so may damage the unit or cause an accident resulting in injury or death. 1. Set the function switch to Ω. 2. Connect the red test lead to the V, Ω terminal, and the black to the COM terminal.
――――――――――――――――――――――――――― 2.6 Continuity Checking DANGER Do not input voltage to the continuity checking function. Doing so may damage the unit or cause an accident resulting in injury or death. 1. Set the function switch to 2. Connect the red test lead to the V, Ω terminal, and the black to the COM terminal.
――――――――――――――――――――――――――― 2.7 Diode Check DANGER Do not input voltage to the diode checking function. Doing so may damage the unit or cause an accident resulting in injury or death. To avoid electrical accidents, turn off the power before measuring a circuit. 1.
――――――――――――――――――――――――――― 2.8 HOLD.Auto Function HOLD.Auto Function can display the maximum value during voltage, current or frequency, duty factor measurement or minimum value during resistance measurement. When pressing the SHIFT/H.AUTO key for at least 1 second, the indicator lights. To HOLD cancel it press the key again for at least 1 second.
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――――――――――――――――――――――――――― ・ When the measured value is less than the dead zone again, interprets it to be cut off from the circuit to be measured, leaving it fixed until getting a new value higher than the dead zone until the interval, the HOLD indicator starts to go on and off.
――――――――――――――――――――――――――― 2.9 Overvoltage warning function During voltage or current measurement, the "OF" indication appears indicating polarity and overvoltage and the buzzer sounds when the reading exceeds the maximum value (5610 dgt.). A warning is given if reading exceeds "1010" NOTE in the maximum range of the DC V setting or 10 A range, or "760"...
――――――――――――――――――――――――――― 2.10 Relative (Relative display) function Relative function operates on all measurement functions. This function displays the result of subtracting the reference data from the measurement data. When pressing the REL Key, the REL indicator lights. To cancel it press the key again, then the indicator will go out.
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――――――――――――――――――――――――――― Relative function is disabled by changing NOTE functions, by pressing SHIFT/H.AUTO Key or RANGE key, or by turning off the power switch. ―――――――――――――――――――――――― Chapter 2 Measurement Procedures...
――――――――――――――――――――――――――― 2.11 Auto Power Save Function ・ The Auto Power Save function automatically activates the Power Save mode about 30 minutes after the last operation. ・ The Auto Power Save function is automatically enabled as soon as the power is turned on (the APS indicator lights).
――――――――――――――――――――――――――― Chapter 3 Specifications 3.1 General Specifications Dual integration Measurement System AC Measurement True RMS measurement System Type of Display TN type LCD, 1/4 Duty, Dynamic Drive. 3-1/2 dgt., 5610 max. (however Maximum measurement count with the Hz function, up to 14999) Automatically lights only when ’−’.
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――――――――――――――――――――――――――― 9170 TEST LEADS Accessories 9378 CARRYING CASE Instruction manual Two R03 manganese batteries Rated supply voltage 1.5 VDC×2, Power Supply two R03 manganese batteries Maximum rated VDC, VAC, Hz, Duty factor : 1000 7 VDC/750 Vrms (sin) or 10 V・Hz voltage Ω: 600 VDC/600 Vrms (sin)
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――――――――――――――――――――――――――― 0 ℃ to 50℃, 80% rh or less Operating Temperature and 32 F to 122 F, 80% rh or less (no condensation) Humidity Range Storage Temperature -20℃ to 60℃, 70% rh or less -4 F to 140 F, 70% rh or less and Humidity Range (no condensation) Temperature...
――――――――――――――――――――――――――― 3.2 Accuracy Chart 23℃±5℃(73 F±5 F), 80% rh or less (no condensation) ■ Voltage measurement Function Range Accuracy Input Over impedance Protection for 1 minute 560.0 mV ±0.35%rdg.±4dgt. Approx.11 MΩ 1000 VDC/ 5.600 V ±0.35%rdg.±2dgt. 750 VAC sin 56.00 V ±0.6%rdg.±2dgt.
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――――――――――――――――――――――――――― ■ Duty factor measurement Function Range Accuracy 100.0 % ±1.0%rdg.±15dgt. 10 Hz to 1 kHz (5 to 95%) ±1.0%rdg.±50dgt. 1 to 10 kHz ・The accuracy figures are determined with the square wave (5 V p‑ p) from 10% to 90% of duty factor. ‑‑‑‑...
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――――――――――――――――――――――――――― ■ Current measurement Function Range Accuracy Input Over Protection impedance for 1 minute (less than) 56.00μA ±1.5%rdg.±4dgt. 10.5 kΩ 1 A/600 V 560.0μA ±1.5%rdg.±4dgt. 110 Ω FUSED 5600μA ±1.5%rdg.±4dgt. 110 Ω (56μA to 56.00 mA ±1.5%rdg.±4dgt. 3 Ω 560 mA range) 560.0 mA ±1.5%rdg.±4dgt.
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――――――――――――――――――――――――――― Chapter 4 Maintenance and Service 4.1 Changing the Batteries and Fuses WARNING To avoid electric shock when replacing the batteries and fuses, first disconnect the test leads from the object to be measured. Also, after replacing the batteries and fuses, always replace the cover and tighten the screws before using the tester.
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――――――――――――――――――――――――――― In order to protect the circuitry, a fuse is provided for μA, mA or A terminals. When current does not measured normally, the fuse might be blown by over current. Referring to the diagram, change the batteries or fuses as follows: 1.
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If the unit is not functioning properly, check the batteries, the test leads wiring and fuse blowing. If a problem is found, contact your dealer or HIOKI representative. Pack the unit carefully so that it will not be damaged during transport, and write a detailed description of the problem.
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――――――――――――――――――――――――――― ―――――――――――――――――――――――― Chapter 4 Maintenance and Service...
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HIOKI 3257 DIGITAL HiTESTER Instruction Manual Publication date: October 2000 Revised edition 5 Edited and published by HIOKI E.E. CORPORATION Technical Sales Support Section All inquiries to Sales and Marketing International Department 81 Koizumi, Ueda, Nagano, 386-11, Japan FAX: 0268-28-0568 TEL: 0268-28-0562 E-mail: os-com@hioki.co.jp...
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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 HIOKI USA CORPORATION 6 Corporate Drive, Cranbury, NJ 08512, USA TEL +1-609-409-9109 / FAX +1-609-409-9108 3257A980-05 00-10-0004H Printed on recycled paper...
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