Iso-Tech IDM201N Instruction Manual
The Iso-Tech IDM201N is a versatile and portable bench-type multimeter suitable for workshop and laboratory engineers and technicians, as well as field-service engineers who require a self-powered instrument for maintenance, test, or repair activities. It can be powered by an AC mains supply or internal batteries. The instrument features a 3½ digit (2000 count) backlit LCD display, auto-range function, and a variety of measurement capabilities, including DC and AC voltages, DC and AC currents, resistance, continuity checking, capacitance, diode testing, and frequency.
PDF
Download
Document
Advertisement
Advertisement
Instruction Manual IDM201N Digital Multimeter EN ES FR Table of Contents SECTION 1SAFETY INFORMATION 3 SECTION 2 INTRODUCTION 7 SECTION 3SPECIFICATIONS 9 3.1 General Specifications 10 3.2 Electrical Characteristics 11 SECTION 4OPERATION 16 4.1 Controls And Connectors 16 4.2 Preparation And Caution Before Measurement 20 4.3 Voltage Measurement 20 4.4 Current Measurement 20 4.5 Resistance Measurement 21 4.6 Audible Continuity Test 21 4.7 Diode Check 21 4.8 Capacitance Measurement 22 4.9 Frequency Measurement SECTION 5MAINTENANCE 2 15 4.0 Setting Up The Instrument 22 23 5.1 Battery Installation Or Replacement 24 5.2 Meter Fuse Replacement 25 5.3 Mains Fuse Replacement 25 5.4 Attaching And Detaching The Carrying Strap 26 SECTION 1 SAFETY INFORMATION 3 Safety Information Read and understand this Instruction Manual completely before using this instrument. Failure to observe the warnings and cautions in this Instruction Manual may result in injury, death, or damage to the instrument and other equipment or property. If this instrument is used in a manner not specified in these instructions, the protection provided by the instrument may be impaired. WARNING • Examine the instrument and probes before use. Do not use the instrument if it is wet or damaged • When using test leads or probes, keep your fingers behind the finger guards • Remove the test lead from the instrument before opening the battery cover or instrument case • Always use the correct terminals, switch position and range for measurements • Never attempt a voltage measurement with the test leads inserted into the current input terminals • Verify the instrument is operating correctly by measuring a known voltage before use. If in doubt, have the instrument serviced • Do not apply more than the rated voltage, as marked on the instrument, between terminals or between any terminal and earth ground • Do not attempt a current measurement when the open-circuit voltage is above the fuse protection rating • Only replace a blown fuse with the correct type and rating as specified in this Instruction Manual • Use caution when measuring voltages above 30V ac rms or 60V dc. These voltages pose a shock hazard • To avoid incorrect readings that can lead to electric shock, replace the battery as soon as low battery indicator appears in the display • Disconnect the circuit power and discharge all high-voltage capacitors before making resistance, continuity, diode or capacitance measurements • Do not use the instrument in a Hazardous Area or around explosive gasses or vapours • Wear suitable Personal Protective Equipment when working around or near hazardous Live conductors which could be accessible • When this instrument is powered from a Mains power source, the Protective Conductor Terminal must be connected to Ground • Before powering this instrument from a mains power source, ensure the mains input voltage selector is set to the correct position 4 Caution • Disconnect the test leads from the test points before changing the position of the function rotary switch • Never connect the instrument to a source of voltage with the function rotary switch in Ω//A //Hz position • If possible, do not work alone, so assistance can be given if required • Do not expose the instrument to extremes of temperature or high humidity • When connecting the test leads to a circuit or device, connect the black lead before the red lead and disconnect the red lead before the black lead • If the instrument is used near equipment that generates electro-magnetic interference, the display may be unstable or indicate incorrect measurements • When measuring current using the 10A range, the maximum measurement duration is 30 seconds in any 10 minute period for currents greater than 10A The following symbols may appear on the instrument and in this Instruction Manual: Risk of electric shock Refer to Instruction Manual Direct Current (dc) Equipment protected throughout by double or reinforced insulation Battery Fuse Earth Alternating Current (ac) Conforms to applicable EU directives 5 6 SECTION 2 INTRODUCTION 7 2. Introduction The ISO-TECH IDM 201N Multimeter is a versatile and portable bench-type instrument suitable for workshop and laboratory based engineers and technicians, as well as field-service engineers who require a self-powered instrument for maintenance, test or repair activities. The instrument may be powered from an ac mains supply between 90V ac and 263V ac, or by internal batteries as required. An integral compartment provides stowage space for test leads, spare batteries and fuses. The instrument uses a 3½ digit (2000 count) backlit Liquid Crystal Display with annunciators, polarity and automatic decimal point placement. The auto-range function may be disabled for convenience and Maximum/Minimum and data-hold functions can also be selected if required. The measurement capabilities are as follows: • DC and AC voltages • DC and AC current • Resistance and continuity checking • Capacitance and Diode testing • Frequency Unpacking and Inspection Unpack the multimeter and check the contents for damage. If any items are damaged or missing, contact the supplier. The instrument is supplied with the following items: 1. The Digital Multmeter. 2. One pair of Test-leads (one red lead and one black lead). 3. This Instruction Manual. 4. One UK-style mains power cable. 5. One Schuko style mains power cable. 6. One Carrying-strap. 7. One pair of Alligator-clips (One red clip and one black clip) 8 SECTION 3 SPECIFICATIONS 9 3.1 General Specifications Display: 3-1/2 digit (2000 count), full annunciators, automatic polarity indication Measurement Rate: 1.5 times per second Over range Indication: OL is displayed for Ω, Hz, functions. Actual value is shown for A, and V functions Backlight: Electroluminescent panel Operating Temperature: 0°C to 50°C Storage Temperature: -30°C to 70°C (batteries removed) Temperature Stability: 0.15 x (Spec. Accuracy) per °C, < 18°C or > 28°C Relative Humidity: Maximum RH 80% for temperatures up to 31°C decreasing linearly to 50% RH at 40°C Safety: EN (IEC) 61010-1:2001 specifications Maximum Voltage to Earth: 600V dc or ac peak to any terminal Power Requirements: ac; 90 ~ 264V, 50/60Hz < 10VA, dc; Qty 6 x 1.5V AA LR6 or AM3 battery Battery Life: 1200 hours without backlight (alkaline) or 80 hours with continuous backlight (alkaline) Size (mm): 218(W) x 195(L) x 73(H) without carrying strap Weight: 1.3 Kg without power cord Mains Fuse: 80mA/250V, FAST, 5x20mm HBC Ceramic Overload Protection: 1A 600V IR 10KA fuse (Bussmann BBS-1 or equivalent) for μA and mA input 15A 600V IR 10KA fuse (Bussmann KTK 15 or equivalent) for A input Environment Conditions The equipment was designed for use in the following environmental conditions: • Indoor use only. • Maximum Altitude: 2000 meters. • Installation Category (Measurement Category): IEC 61010-1, 600V CAT II, 300V CAT III. • Pollution degree: 2 10 Note: Measurement Category l is for measurements performed on circuits not directly connected to mains. Examples include: Measurements on battery powered equipment and specially protected (internal) mains-derived circuits. Measurement Category ll is for measurements on circuits directly connected to the low voltage installation. Examples include: Household appliances, portable tools and similar equipment. Measurement Category lll is for measurements performed in the building installation. Examples include measurements on distribution boards, junction boxes, socket-outlets and wiring and cables in the fixed installation. Measurement Category lV is for measurements performed at the source of the low-voltage installation. Examples include measurements on primary overcurrent protection devices and electricity meters. 3.2 Electrical characteristics Accuracy is ±(% reading + number of digits) at 23°C ± 5°C, less than 80% R.H. (1) DC Volts Range Resolution 200mV 100µV 2V 1mV 20V 10mV 200V 100mV 600V 1V Accuracy ± (0.5% + 2d) Over voltage protection 1100V dc or 1100Vp-p Input Impedance: 10MΩ (over 1000MΩ in 200mV range). 11 (2) AC Volts Range Resolution Accuracy 200mV 100µV Unspecified 2V 1mV 20V 10mV 200V 100mV 600V 1V Over voltage protection 1100V dc or 1100Vp-p ± (1.5% + 5d) 50Hz to 500Hz Input Impedance: 10MΩ // less than 100pF. AC Conversion Type: AC conversions are ac-coupled true rms responding and calibrated to the rms value sine-wave input. (3) Resistance Range Resolution Accuracy 200Ω 0.1Ω ±(0.7% + 3d) *1 2KΩ 1Ω 20KΩ 10Ω 200KΩ 100Ω Over voltage protection ±(0.7% + 3d) 2MΩ 1KΩ ±(1.0% + 3d) 20MΩ 10KΩ ±(2.5% + 3d) *2 600V dc or 600V rms Open circuit Voltage: -1.3V approx. *1 < 10dgt rolling. *2 < 100dgt rolling. (4) Diode Check Resolution Accuracy Max. Test Current Max. Open Current Voltage Overload protection 10mV ±(1.5% + 5d) For 0.4V to 0.8V 1.5mA 3V 600V dc or 600V rms Internal beeper activates it the voltage of the circuit under test is less than 0.25V. 12 (5) Continuity The internal sounder activates if the resistance of the circuit under test is less than 20Ω. It will then turn off if the resistance is increased beyond 50Ω. Response time is approximately 50 msec. Overload Protection: 600V dc/ac rms max. (6) Capacitance Range Resolution Accuracy 2nF *3 1pF ±(1.9% + 20d) 20nF 10pF 200nF 100pF 2µF 1nF 20µF 10nF 200µF 100nF 2mF 1µF *1 Over voltage protection 600V dc or 600V rms ±(1.9% + 8d) ±(1.9% + 8d) *2 *1 <100 dgt of reading rolling. *2 The accuracy is specified with the backlight not activated. *3 For accurate readings, do not use the mains power supply when measuring low-value capacitance. *4 In order to ensure the best accuracy in measurement of a low value capacitance, note and subtract the stray capacitance of the open-circuit test leads from subsequent measurements. (7) Frequency Range Resolution ** Sensitivity 2000Hz 1Hz 20KHz 10Hz 200KHz 100Hz 2MHz 1KHz 250mV rms 20MHz 10KHz 1V rms Accuracy Overload protection 0.01% ± 2d 600V rms 100mV rms * * Less than 20Hz the sensitivity is 1.5V rms. ** Max. Sensitivity: <5 Vac rms. 13 (8) DC Current Range Resolution 200.0μA 0.1µA 2000μA 1µA 20.00mA 0.01mA 200.0mA 0.1mA 10A 10mA Accuracy Voltage Burden ±(1.0% + 2d) 800mV max ±(1.5% + 4d) 1V max Accuracy Voltage Burden ±(1.5% + 5d) 800mV max ±(2.5% + 5d) 1V max 10A Range: 30 seconds maximum for current greater than 10A. (9) AC Current Range Resolution 200.0μA 0.1μA 2000μA 1μA 20.00mA 0.01mA 200.0mA 0.1mA 10A 10mA Frequency Response: 50Hz to 500Hz 10A Range: 30 seconds maximum for current greater than 10A. AC Conversion Type: AC conversions are ac-coupled true rms responding and calibrated to the rms value sine-wave input. (10) Auto Power-off (APO) If the instrument is not used for more than 10 minutes, it automatically turns the power off. The state of the instrument is stored and it can be turned on again by pressing any button or changing the rotary switch position. If a button is pressed, the LCD displays the saved state; press the Hold button to disable the hold state. The instrument will alarm 15 seconds before automatically turning power off, but any button press or rotary switch movement will reset Auto Power-off. (11) Disable Auto Power-off To disable the auto power-off function, press and hold any button (except the Hold button) whilst turning on the instrument. 14 SECTION 4 OPERATION 15 4.0 Setting Up The Instrument Connecting to the Mains power supply CAUTION: To avoid instrument damage, check the rear-panel voltage selection switch is set to the Mains power supply voltage in your area (see below) Mains supply voltage: Switch setting: 90 to 132V, 50/60 Hz± 198 to 264V, 50/60 Hz 4.1 Controls And Connectors See Figure 1 for location of controls and connectors of the front panel. 1. Digital Display: The digital display has a 3-1/2 digit LCD readout (maximum reading 2000), with auto polarity, decimal point, overrange, AC/DC, Ω / ,, MAX.MIN. and units indicators. 2. Rotary Switch: Select the Function and Range as required. 3. COM Input Terminal: Ground input connector. 4. VΩHz Input Terminal: Positive input connector for Volts, Ohms and Diode test, Capacitance and Frequency measurements. 5. mA Input Terminal: Positive input connector for low-current measurement. 6. A Input Terminal: Positive input connector for high-current measurement. The instrument can measure up to 20A. Maximum measurement duration is 30 seconds in any 10 minute period for currents greater than 10A. 7. Back Light: Press the yellow button to toggle the LCD backlight on or off. 8. Hold Button: Press the HOLD button to toggle the Data Hold mode on or off. In the Data Hold mode, the annunciator is displayed and the display is frozen. When the hold button is pressed the beeper emits a tone and the value being read is held on the display. In the MIN MAX Recording mode, press the Hold button to freeze the readings. Press the Hold button again to release the hold function for normal recording. 16 9. Function Button (Blue): Press this button to toggle between AC and DC for current measurements, or to toggle between Resistance and Continuity Measurements, Frequency or ADP measurements. 10. Min Max Button: Press the MIN MAX Button to enter the MIN MAX Recording mode. The minimum and maximum values are then updated by the present input. In the MIN MAX Recording mode, the minimum or maximum readings are stored in memory. The beeper emits a tone when a new minimum or maximum value is over 2000 counts. In the MIN MAX Recording mode, press the Hold button to stop the recording of readings and freeze the display. Press the Hold button again to restart recording. 11. Range button (Manual Range): T he “Range” button is pressed to select manual ranging and to change ranges. When the “Range” button is pressed once, the Autorange indicator turns off. Press the “Range” button to select the most appropriate range to suit the measurement being made. Press the “Range” button and hold for 2 seconds to return to Autorange mode. See Figure 2 for location of controls and connectors of rear panel. 1. Mains Power ON/OFF Switch: Push to the “1” position to turn on the a.c. power supply. Push to the “0” position to turn off the a.c. power supply. 2. Mains Power Connector: Input connector for mains power cable. 3. Mains Fuse: Provides protection for equipment during malfunction or overload. 4. Mains Voltage Selector: Permits the selection of various mains supply voltages. CAUTION: Set the MAINS VOLTAGE SELECTOR to the correct voltage before operating the instrument from a mains power supply. 17 8 7 4 6 3 5 1 9 10 11 Figure 1. Controls and Connectors 18 2 2 1 3 4 Figure 2. Controls and Connectors 19 4.2 Preparation And Caution Before Measurement 1. Wait 30 seconds after turning on the instrument before making a measurement. 2. Set the rotary switch to the required function before connecting the probes to the circuit or equipment under test. Remove the test leads from the circuit or equipment under test before changing the rotary switch position. 4.3 Voltage Measurement 1. Connect the BLACK test lead to the COM terminal and the RED test lead to the “VΩHz” terminal. Set the Rotary switch to the a.c. V or d.c. V position. 3. Connect the test leads across the source or load under test. The polarity of the RED lead connection will be indicated at the same time as the voltage is displayed. A buzzer will sound if the input voltage exceeds the maximum input voltage in either auto or manual range modes. In an over-range condition, the MSD (most-significant digit) of the LCD display flashes and the three least-significant digits will indicate zero. 4.4 Current Measurement Caution: The instrument can measure up to 20A, but for currents greater than 10A the maximum measurement duration is 30 seconds in any 10 minute period. 1. When measuring current of less than 200 mA, connect the BLACK test lead to the COM terminal and the RED test lead to the “mA” terminal. When measuring current greater than 10A, connect the RED test lead to the “A” terminal. The instrument can measure up to 20A, but maximum measurement duration is 30 seconds in any 10 minute period for currents greater than 10A. 2. Set the rotary switch to the range required (200μA - 200mA) for the current to be measured. Use the function button to select ac or dc mode as required. NOTE: If the current to be measured is not known, start at the highest range and reduce the range as required. 3. Connect the test leads in series with the circuit to be measured. 20 4.5 Resistance Measurement WARNING: Disconnect the circuit power and discharge all high-voltage capacitors before making resistance measurements. 1. Connect the BLACK test lead to the COM terminal and RED test lead to the “VΩHz” terminal. NOTE: The polarity of the RED test lead is “+”. 2. Set the rotary switch to the “Ω” position to measure resistance. Select Ω measurement using the function button. 4.6 Audible Continuity Test WARNING: Disconnect the circuit power and discharge all high-voltage capacitors before testing for continuity. 1. Connect the BLACK test lead to the COM terminal and the RED test lead to the “VΩHz” terminal. 2. Set the rotary switch to “ ” position. 3. Connect the test leads across the resistance to be measured. The buzzer will sound if the resistance of the circuit measured is lower than approximately 50 Ohms. 4.7 Diode Check WARNING: Disconnect the circuit power and discharge all high-voltage capacitors before testing a diode. 1. Set the rotary switch to the “” position. 2. Connect the BLACK test lead to “COM” terminal and RED test lead to the “VΩHz ” terminal. NOTE: The polarity of the RED test lead is “ +”. 3. Connect the test leads across the diode and note the reading. 4. Reverse the connections to the diode and again note the reading. Note: If the diode under test is good, the test in one direction should show a voltage between approximately 0.40V to 0.80V for a silicon device and the test in the opposite direction should show ”OL”. A faulty device will show either “000”, “OL” or approximately 3.2V or a combination of these in both directions. 21 4.8 Capacitance Measurement WARNING: Disconnect the circuit power and discharge all high-voltage capacitors before testing for capacitance. 1. Connect the BLACK test lead to the COM terminal and the RED test lead to the “VΩHz ” terminal. 2. Set the rotary switch to “” position. 3. Observe polarity when measuring polarized capacitors. 4. Connect the test leads across the capacitor under measurement. Note: For accurate measurement of low value capacitance, subtract the open lead capacitance from the displayed value. 4.9 Frequency Measurement 1. Connect the BLACK test lead to the COM terminal and the RED test lead to the “VΩHz ” terminal. 2. Set the rotary switch to “Hz” position. 3. Connect the test leads across the source or load under measurement. Note: The least significant one or two digits of digital display may be unstable at frequencies below 1kHz and above 20 kHz. 22 SECTION 5 MAINTENANCE 23 5. Maintenance Do not attempt to repair this Instrument. It contains no user-serviceable parts. Repair or servicing should only be performed by qualified personnel. This instrument should be calibrated yearly, or more frequently if used in harsh conditions or if it is suspected of being inaccurate. Cleaning Periodically wipe the case with a damp cloth and detergent. Do not use abrasives or solvents. 5.1 Battery Installation Or Replacement WARNING: To avoid electric shock, remove the test leads and power cable before replacing the batteries. Refer to figure 3a and use the following procedure to replace the batteries. 1. Disconnect the test leads from any circuit under test and remove them from the instrument. Turn the ON / OFF switch on the rear panel to off and remove the mains power lead from the instrument. 2. Use a finger or thumb to release the catch on the accessory compartment and open the cover. Remove any stored accessories. 3.Use a slotted screwdriver or other appropriate tool to release the catch on the battery cover at the rear of the compartment and remove the cover. Retain the cover. 4. Disconnect the battery connector clip and remove the battery holder from the battery compartment. Retain the battery holder. 5.Remove the exhausted batteries from the battery holder and replace them with new ones. Observe the correct polarity as marked on the battery holder. Do not mix batteries of different types or old and new batteries. 6. Reconnect the battery connector clip and refit the battery holder into the battery compartment. 7. Refit the battery compartment cover removed in para. 3 above. 8. Replace the accessories removed in para. 2 above. 9. Close the accessory compartment cover. 10. Turn the instrument on and check for correct operation. 11. Dispose of the removed batteries in accordance with local regulations. 24 5.2 Meter Fuse Replacement WARNING: To avoid electric shock, remove the test leads and power cable before replacing the batteries. Refer to Figure 3b and use the following procedure to replace the meter fuse(s). 1.Disconnect the test leads from any circuit under test and remove them from the instrument. Turn the ON / OFF switch on the rear panel to off and remove the mains power lead from the instrument. 2. Use a finger or thumb to release the catch on the accessory compartment and open the cover. Remove any stored accessories. 3.Use a slotted screwdriver or other appropriate tool to release the catch on the fuse cover at the front of the compartment and remove the cover. Retain the cover. 4.Use a slotted screwdriver or other appropriate tool to gently lever one end of the fuse loose from the fuse-clip and slide the fuse out from the remaining fuse-clip 5. Fit a new fuse into the fuse-clip of the size and type given in Section 3.1 “General Specifications”. Ensure the fuse is centered in the fuse holder. 6. Refit the fuse compartment cover removed in para. 3 above. 7. Replace the accessories removed in para. 2 above. 8. Close the accessory compartment cover. 9. Turn the instrument on and check for correct operation. 10. Dispose of the removed fuse(s) in accordance with local regulations. 5.3 Mains Fuse Replacement WARNING: To avoid electric shock, remove the test leads and power cable before replacing the batteries. 1.Disconnect the test leads from any circuit under test and remove them from the instrument. Turn the ON / OFF switch on the rear panel to off and remove the mains power lead from the instrument. 2. Refer to figure 2. Locate the Mains fuse holder on the rear panel. 3. Use a slotted screwdriver to release the fuse drawer. 4. Remove the fuse from the fuse drawer. 5. Fit a new fuse of the type given in Section 3.1 “General Specifications”. 25 6. Close the fuse drawer. 7. Reconnect the mains connector. 8. Turn the instrument power on and check for correct operation. 9. Dispose of the removed fuse in accordance with local regulations. 5.4 Attaching And Detaching The Carrying Strap 1. Refer to Figure 3c. 2. Locate the grips on the sides of the clips on the ends of the carrying strap. 3. Squeeze the grips between the finger and thumb whilst inserting the male portion of the clip into the receptacle attached to the instrument. 4. Push the clip fully into the receptacle until it latches into place. 5. Pull the strap to ensure it is correctly and securely engaged into the receptacle. 6. Repeat the operation with the clip on the other end of the strap. 7. To remove the strap, squeeze the grips on the sides of the clips and withdraw them from the receptacle. 26 OPENED BY SCREWDRIVER BATTERY CONNECTOR BATTERY BOX BATTERY (1.5Vx6) BUTTON WARNING WARNING OPENED BY COIN BATTERY COVER WARNING Figure 3a Battery Replacement Figure 3A. Battery Replacement 27 F1 (1A 600V) F2 (15A 600V) OPENED BY SCREWDRIVER BUTTON WARNING WARNING OPENED BY COIN FUSE COVER CAUTION TO AVOID ELECTRIC SHOCK, THE POWER CORD PROTECTION GROUNDING CONDUCTOR MUST BE CONNECTED TO GROUND. NO INTERNAL USER SERVICEABLE PARTS. REFER SERVICE TO QUALIFIED SERVICE PERSONNEL. ~ 90V ~ SERIAL NO. MANUFALTURED BY APPA TECHNOLOGY CORP. MADE IN TAIWAN 198V 264V 50/60 Hz Use only with a 250V fuse Emloyer uniquement avce un fusible de 250V 132V 50/60 Hz WARNING DISCONNECT INPUT POWER BEFORE REPLACING FUSE. FOR FIRE PROTECTION REPLACE ONLY WITH SPECIFIED TYPE AND RATED FUSE. FUSE: 80mA/250V, FAST, 5x20mm WARNING Figure 3b Fuse Replacement Figure 3B. Fuse Replacement 28 Figure 3C. Carrying Strap Attachment 29 30 Africa Iso-Tech 1 & 2 Indianapolis Street Kyalami Business Park Kyalami, Midrand, South Africa Japan West Tower (12th Floor) Yokohama Business Park 134 Godocho, Hodogaya Yokohama, Kanagawa 240-0005 Japan Asia Iso-Tech 460 Alexandra Road, #15-01A PSA Building Singapore 119963 USA 7410 Pebble Drive Fort Worth Texas 76118-6961 Europe Iso-Tech PO Box 99 Corby Northamptonshire NN17 9RS United Kingdom Canada 1701 Woodward Drive Ste 108 Ottawa Ontario K2C 0R4, Canada South America Av. Pdte. Eduardo Frei M. 6001-71 Centro Empresas El Cortijo Conchali, Santiago, Chile ">

Public link updated
The public link to your chat has been updated.
Advertisement
Key features
- 3.5 digit LCD
- Auto-range
- AC/DC Voltage
- Current Measurement
- Resistance
- Continuity
- Capacitance
- Diode
- Frequency
- Backlight
Frequently asked questions
The IDM201N can measure up to 20A, but for currents greater than 10A the maximum measurement duration is 30 seconds in any 10 minute period.
Connect the BLACK test lead to the COM terminal and RED test lead to the "VΩHz" terminal. Set the rotary switch to the "Ω" position to measure resistance. Select Ω measurement using the function button.
Set the rotary switch to the "" position. Connect the BLACK test lead to “COM” terminal and RED test lead to the “VΩHz ” terminal. Connect the test leads across the diode and note the reading. Reverse the connections to the diode and again note the reading. If the diode under test is good, the test in one direction should show a voltage between approximately 0.40V to 0.80V for a silicon device and the test in the opposite direction should show ”OL”. A faulty device will show either “000”, “OL” or approximately 3.2V or a combination of these in both directions.