USER S MANUAL DIGITAL POCKET MULTIMETER DMR-1500 CIRCUIT-TEST ELECTRONICS www.circuittest.com
TABLE OF CONTENTS SAFETY Safety Information............................... 2-3 Safety Symbols................................... 3 INTRODUCTION LCD Symbol Definitions............................. 4 Front Panel Description............................. 5 SPECIFICATIONS General......................................... 6 Ranges and Accuracy.............................. 7 OPERATING INSTRUCTIONS 1. DC Voltage Measurement........................ 8 2. AC Voltage Measurement...................... 8-9 3. Resistance Measurement........................ 9 4. Continuity Test................................ 10 5. Diode Test.................................10-11 6. Frequency Measurement........................ 11 7. Capacitance Measurement....................11-12 8. Duty Cycle Measurement....................... 12 9. Relative Function.............................. 12 10. Battery Replacement........................... 13 MAINTENANCE...................................... 13 WARRANTY......................................... 14 1
SAFETY INFORMATION This meter is CUL and UL approved. This meter is designed to be safe under the following conditions: indoor use, altitude up to 2000m, temperature 5 C to 40 C, maximum relative humidity 80% for temperatures up to 31 C decreasing linearly to 50% relative humidity at 40 C and rated pollution degree 2. Caution and proper guidelines must be followed for personal and product safety. Read this instruction manual carefully and completely before using the meter. Lack of caution or poor safety practices can result in serious injury or death. This meter is not recommended for high voltage industrial use; for example, do not use for measurement on 440VAC or 600VAC industrial power mains. The unit is intended for use with low energy circuits up to 600VDC / 600VAC or high energy circuits up to 250VAC / 250VDC only. Use caution when working above 60VDC or 30VAC RMS as these voltages pose a shock hazard. Always consider circuits to be energized. Never assume any equipment to be de-energized. Always start with power off. Set the function switch to the correct setting before making any measurements and do not change position of the function switch during measurements. Never connect unit to AC or DC powered circuits when the function switch is set to resistance, diode check or continuity ranges. Always disconnect the power when performing resistance, diode or capacitance tests. Discharge capacitor before testing. Disconnect the live/positive test lead (red) prior to disconnecting the common/negative test lead (black). 2
When ʻBATʼ appears on the display, change both batteries to achieve more accurate readings. Turn the meter off and disconnect any load before removing the batteries. Do not operate the unit unless the case is completely closed. When using the test probes always keep fingers behind the finger guards. Never touch the exposed probe tip. Always inspect the instrument, test leads and other accessories for damage prior to use. SAFETY SYMBOLS Safety symbols and special annunciators on the meter and in this manual indicate cautions and warnings of important operational procedures that must be followed to ensure personal and product safety. This symbol indicates a General Warning. When adjacent to a terminal or operating device indicates that the operator must refer to an explanation in the Operating Instructions. 450V This symbol indicates that the terminal(s) so marked must not MAX be connected to a circuit point at which the voltage with respect to ground exceeds 450V AC/DC. This symbol adjacent to one or more terminals indicates them as being associated with ranges that may in normal use, be subjected to particularly hazardous voltages. For maximum safety, the meter and its test leads should not be handled when these terminals are energized. 3
INTRODUCTION DMR-1500 is an Auto Ranging Pocket sized meter featuring a large 3-3/4 digit LCD display with a 4000 count. This meter can measure/test the following: Voltage Frequency Resistance Continuity Diode Duty Cycle LCD DISPLAY SYMBOL DEFINITIONS DISPLAY/SYMBOL DEFINITION DISPLAY/SYMBOL DEFINITION AUTO Auto Ranging µ Micro BAT Low Battery m milli DC Direct Current F Farads AC Alternating Current V Volts Diode K Kilo Continuity M Mega n nano Ohms % Duty Cycle Hz Hertz Relative AUTO BAT DC AC n% umfv KM Hz 4
DMR-1500 1 AUTO BAT DC AC 4000 COUNT n% umfv KM Hz Hz/% RELATIVE 2 3 SELECT DC/ AC Ω / / / VOLT Hz /% 4 OFF AUTO POWER OFF 5 CIRCUIT-TEST MAX 450V! DC / AC MAX 450V FRONT PANEL DESCRIPTION NO. ITEM DESCRIPTION 1 LCD Display 3-3/4 digit 4000 count LCD Display 2 Hz/% Button Use with the function switch to select Frequency/Duty Cycle/Voltage 3 Relative Button Indicated by on the LCD display. The displayed reading becomes the reference for subsequent readings. The reading will get zeroed, stored and subtracted from subsequent readings. This function can be used for capacitance and voltage measurements. 4 Select Button Depending on the measurement mode selected on the function switch: a) Volt mode - select between AC or DC b) / / / mode - select between resistance, capacitance, diode and continuity check 5 Function Switch Use to select different measurement modes or to turn the meter OFF 5
SPECIFICATIONS GENERAL Display: 3 3 / 4 digit 4000 count LCD Maximum Display: 3999 Ranging: Auto Auto Shut-off: Meter will shut-off after 30 minutes from last use Polarity: Automatic, minus (-) sign indicates negative polarity; no sign for positive polarity Measuring rate: 3 times/sec Input impedance: 10M (DCV / ACV) Diode Test: Test current of 1.0 ma maximum Continuity: Audible signal sounds if resistance is less than 30 Over range indication: ʻOLʼ is displayed Operating Temp: 5 to 35 C (41 to 95 F) Storage Temp: -10 to 50 C (14 to 122 F) Relative Humidity: <75% Operating/Storage Power Source: 2 x LR44 or SR44 cells Dimensions: 106(H) x 51(W) x 10(D) mm (4 13 / 16 x 2 x 3 / 8") Weight: 100g (3.5oz) [with case and test leads] Accessories included: One pair of test leads (built-in), 2 x LR44 batteries (installed), Userʼs manual 6
RANGES AND ACCURACY FUNCTION RANGE RESOLUTION ACCURACY DC VOLTAGE (DC V) AC VOLTAGE (AC V) (40-200HZ) 400mV 4V 40V 400V 450V 4V 40V 400V 450V RESISTANCE 400 4k 40k 400k 4M 40M FREQUENCY 10Hz 100Hz 1000Hz 10KHz 100KHz 0.1mV 1mV 10mV 100mV 1V 1mV 10mV 100mV 1V 0.1 1 10 100 1k 10k 0.001Hz 0.01Hz 0.1Hz 1Hz 10Hz ±(1.0% reading + 3 digits) ±(1.2% reading + 3 digits) ±(1.2% reading + 6 digits) ±(1.0% reading + 5 digits) ±(2.0% reading + 10 digits) ±(0.3% reading + 6 digits) DUTY CYCLE 0.1% - 99.9% ±(2.3% reading + 6 digits) CAPACITANCE 40nF 400nF 4µF 40µF 100µF 0.01nF 0.1nF 1nF 10nF 100nF ±(6.0% reading + 6 digits) NOTE: Accuracy consists of: (% reading i.e. accuracy of the measurement circuit + digits i.e. accuracy of the analog to digital converter) 7
1. DC VOLTAGE MEASUREMENT WARNING: MAXIMUM INPUT IS 450V DC. USE EXTREME CAUTION WHEN WORKING WITH HIGH VOLTAGES. NEVER APPLY THE TEST LEAD TO THE MEASUR- ING CIRCUIT WHEN CHANGING THE POSITION OF THE FUNCTION SWITCH. NOTE: The meter is auto ranging and will automatically display the correct voltage within the overall range of the meter. Set the function switch to VOLT/Hz/%. If ʻDCʼ does not show on the display, push the SELECT button until it appears. Apply the test leads to the circuit to be measured. Ensure that the black lead is connected to the negative side of the circuit and red lead to the positive. Read the displayed voltage. If the minus (-) sign appears it means the voltage is negative at the point being measured. If ʻOLʼ appears on the display, it indicates over-range. Immediately remove test leads from the measuring circuit to avoid any damage to the meter. The input voltage should not exceed the measurement capability of this meter. 2. AC VOLTAGE MEASUREMENT WARNING: MAXIMUM INPUT IS 450V AC. USE EXTREME CAUTION WHEN WORKING WITH HIGH VOLTAGES. NEVER APPLY TEST LEADS TO THE MEASURING CIRCUIT WHEN CHANGING THE POSITION OF THE FUNCTION SWITCH. NOTE: The meter is auto ranging and will automatically display the correct voltage within the overall range of the meter. Set the function switch to VOLT/Hz/%. 8
If ʻACʼ does not show on the display, push the SELECT button until it appears. Apply the test leads to the circuit to be measured. Read the displayed voltage. If ʻOLʼ appears on the display, it indicates over-range. Immediately remove test leads from the measuring circuit to avoid any damage to the meter. The input voltage should not exceed the measurement capability of this meter. 3. RESISTANCE MEASUREMENT WARNING: NEVER CONNECT THE TEST LEAD TO ANY VOLTAGE WHEN THE FUNCTION SWITCH IS SET TO. REMOVE ALL POWER FROM THE CIRCUIT BEING TESTED WHEN CHECKING RESISTANCE. DISCHARGE ANY CHARGED CAPACITORS. NEVER APPLY THE TEST LEAD TO THE MEASURING CIRCUIT WHEN CHANGING THE POSITION OF THE FUNCTION SWITCH. NOTE: The meter is auto ranging and will automatically display the resistance measurements within the overall range of the meter. Set the function switch to / / /. If, or ʻFʼ appear on the display, push the Select button until, K or M appears on the display. Apply the test leads to the resistor being measured. If the resistor is part of a circuit, it is necessary to disconnect one end of the resistor to avoid any unwanted interference from the rest of the circuit. Read the displayed resistance indicated with proper decimal point and one of the symbols, K or M. NOTE: OL appears on the display if the test leads are not connected to anything. 9
4. CONTINUITY TEST WARNING: NEVER CONNECT THE TEST LEADS TO ANY VOLTAGE WHEN THE FUNCTION SWITCH IS SET TO / / /. REMOVE ALL POWER FROM THE CIRCUIT BEING TESTED WHEN CHECKING RESISTANCE. DISCHARGE ANY CHARGED CAPACITORS. Set the function switch to / / /. Press the Select button until appears on the display. Apply the test leads to the circuit. The buzzer will sound if the resistance is less than 30 and the measured resistance value will be displayed in ohms with proper decimal point. 5. DIODE TEST WARNING: NEVER CONNECT THE TEST LEAD TO ANY VOLTAGE WHEN THE FUNCTION SWITCH IS SET TO / / /. REMOVE ALL POWER FROM THE CIRCUIT BEING TESTED WHEN PERFORMING THE DIODE TEST. DISCHARGE ANY CHARGED CAPACITORS. Note: If the diode is part of a circuit, it is necessary to disconnect one end of the diode to avoid any unwanted interference from the rest of the circuit. The value indicated in the display during the diode check is the forward bias voltage. Set the function switch to / / /. Press the Select button until appears on the display. Apply the test leads across the diode terminals and note the meter reading. Reverse the diode and note this reading. Based on the readings the result can be evaluated as follows: 10
If one reading is around 0.5 and the other reading is ʻOLʼ, the diode is good If both readings are ʻOLʼ, the diode is open (defective) If both readings are very small or 0 (zero), the diode is shorted (defective) 6. FREQUENCY MEASUREMENT WARNING: NEVER MEASURE FREQUENCY ON A CIRCUIT WITH MORE THAN 250V. Set the function switch to VOLT/Hz/%. Press Hz/% button once and ʻHzʼ appears on the display. Apply the test leads to the point of measurement. Read the displayed frequency indicated with proper decimal point and symbol. 7. CAPACITANCE MEASUREMENT WARNING: FULLY DISCHARGE THE CAPACITOR BY SHORTING THE CAPACITOR LEADS TOGETHER BEFORE TESTING. NOTE: The meter is auto ranging and will automatically display the correct capacitance value within the overall range of the meter. Set the function switch to / / /. Press the Select button until ʻFʼ appears on the display. Touch the probe tips to the capacitor. Read the value and unit shown on the display. 11
If ʻOLʼ appears on the display, the value of the capacitor is over the maximum range of the meter. 8. DUTY CYCLE MEASUREMENT WARNING: NEVER MEASURE FREQUENCY ON A CIRCUIT WITH MORE THAN 250V. Set the function switch to VOLT/Hz/%. Press the Hz/% pushbutton twice and ʻ%ʼ appears on the display. Apply the test leads to the point of measurement. The duty cycle will be shown on the display with proper decimal point and value. 9. RELATIVE FUNCTION NOTE: This function can only be used when making voltage and capacitance measurements. Relative is indicated by on the LCD display. This function sets the displayed reading to zero and stores it as a reference value which is subtracted from subsequent measurements. Press the button again to release this function and will disappear from the display. Example: When 5V DC is being measured and this button is pressed once, the value is stored. After disconnecting the test probes from the voltage source and then re-applying to another voltage source of 4.5V DC, the LCD will display -0.5V DC. This means that the subsequent reading (4.5V DC) is 0.5V DC lower than the reference (5V DC). 12
10. BATTERY REPLACEMENT WARNING: DISCONNECT BOTH TEST LEADS FROM ANY SOURCE OF VOLTAGE BEFORE REMOVING THE BACK COVER. DO NOT OPERATE THE METER UNTIL THE BACK COVER IS IN PLACE AND FASTENED SECURELY. ʻBATʼ will appear in the display when the battery drops below the operating voltage and requires replacing. Turn off the meter and remove from the carrying case. Remove the single screw securing the battery cover and lift to open. Replace both batteries observing the correct polarity. Replace the cover and tighten the screw. MAINTENANCE a) Always keep the meter dry. b) Keep the meter clean. Wipe the case occasionally with a damp cloth. Do not use chemicals, cleaning solvents or detergents. c) Use and store the meter in recommended normal environmental conditions. Extreme temperatures can shorten the life of the electronic components. d) Use only fresh batteries. e) Remove the batteries when the meter is not being used for a long period of time. 13
LIMITED WARRANTY Circuit-Test Electronics warrants to the original purchaser that this product be free of defect in material or workmanship for a period of 2 years from the date of purchase. Visit our website (www.circuittest. com) for information on warranty service. Any product which has been subjected to misuse or accidental damage is excluded from the warranty. Except as stated above, Circuit-Test Electronics makes no promises or warranties either expressed or implied including warranties of merchantability or the fitness for any particular purpose. Register your product online at www.circuittest.com CIRCUIT-TEST E L E C T R O N I C S A division of R.P. Electronic Components Ltd. www.circuittest.com 14