USER`S MANUAL DMR-6550
Contents
1. maximum Input Limits Function Maximum Input V DC or VAC 1000VDC VAC 10A DC AC 30 seconds max every ADGIAG 15 minutes Frequency Resistance Capacitance Duty Cycle Diode 600V DC AC rms test Continuity Temperature 600V DC AC rms USE EXTREME CAUTION when working with high voltages 3 NEVER connect the meter leads across a voltage source while the function switch is in the current resistance or diode mode Doing so can damage the meter 4 ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode tests 5 ALWAYS turn off the power and disconnect the test leads before open ing the covers to replace the fuse or batteries 6 NEVER operate the meter unless the back cover and the battery and fuse covers are in place and fastened securely Controls and Jacks 6000 count LCD Display Function switch 10A positive input jack COM negative input jack Positive input jack HOLD amp Backlight button Max Min button Range Diode button Hz button o o N o I A wW P OO OQO Symbols and Annunciators a Continuity Low Battery gt Diode HOLD Data Hold AUTO AutoRanging AC Alternating Current or Voltage DC Direct Current or Voltage Specifications Display Polarity Input Impedance Overrange AC Response Low battery indication Measurement rate Auto power off Operatin2. disconnect both test probes from any source of voltage before making a temperature measurement 1 Setthe function switch to F or C position 2 Insert the type K thermocouple probe black test lead banana plug into the negative COM jack and the red test lead banana plug into the posi tive F C jack 3 Touch the Temperature Probe head to the part whose temperature you wish to measure Keep the probes touching the part under test until the reading stabilizes about 30 seconds 4 Read the temperature in the display WARNING To avoid electric shock be sure the thermocouple has been removed before changing to another measurement function 16 Maintenance Replacing the Battery WARNING To avoid electric shock disconnect the test leads from any source of voltage before removing the battery door 1 E will appear in the display when the battery drops below the operating voltage and requires replacing Turn off the meter and disconnect the test leads from the meter Remove the two screws securing the battery cover Replace the 9V battery observing the correct polarity Replace the cover and secure the two screws 2 3 4 5 WARNING To avoid electric shock do not operate your meter until the battery door is in place and fastened securely Replacing the Fuses WARNING To avoid electric shock disconnect the test leads from any source of voltage before removing th
3. diode or semiconductor junction you wish to test Note the meter reading 5 Reverse the probe polarity by switching probe position Note this read ing 6 The diode or junction can be evaluated as follows A If one reading shows a value and the other reading shows OL the diode is good B If both readings show OL the device is open C If both readings are very small or 0 the device is shorted NOTE The value indicated in the display during the diode check is the forward voltage Frequency Duty Cycle Measurements 1 Set the rotary function switch to the Hz position 2 Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive Hz jack Touch the test probe tips to the circuit under test Read the frequency on the display Press the Hz button again to indicate on the display Read the of duty cycle on the display Pa Aa 15 Capacitance Measurements WARNING To avoid electric shock disconnect power to the unit under test and discharge all capacitors before taking any capacitance measurements Remove the batteries and unplug the line cords Set the function switch to the e position 2 Insert the black test lead banana plug into the negative jack COM and the red test lead banana plug into the positive jack 4e 3 Touch the test leads to the capacitor to be tested Temperature Measurements WARNING To avoid electric shock
4. power from the circuit under test then open up the circuit at the point where you wish to measure current 4 Touch the black test probe tip to the negative side of the circuit Touch the red test probe tip to the positive side of the circuit 5 Apply power to the circuit and read the current in the display AC Current Measurements WARNING To avoid electric shock do not measure AC current on any circuit whose voltage exceeds 250V AC CAUTION Do not make current measurements on the 10A scale for longer than 30 seconds Exceeding 30 seconds may cause damage to the meter and or the test leads 1 Insert the black test lead banana plug into the negative COM jack 2 For AC current measurements set the function switch to 10A position and insert the red test lead banana plug into the 10A jack 3 Remove power from the circuit under test then open up the circuit at the point where you wish to measure current 4 Touch the black test probe tip to the negative side of the circuit And touch the red test probe tip to the positive side of the circuit 5 Apply power to the circuit Read the current in the display The display will indicate the proper decimal point value and symbol 18 Resistance Measurements WARNING To avoid electric shock disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements Remove the batteries and unplug the line cords Set the function
5. switch to the Q position 2 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive Q jack 3 Touch the test probe tips across the circuit or part under test It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the resistance reading 4 Read the resistance in the display The display will indicate the proper decimal point value and symbol Continuity Check WARNING To avoid electric shock never measure continuity on circuits or wires that have voltage on them 1 Set the function switch to the position 2 Insert the black lead banana plug into the negative jack COM and the red test lead banana plug into the positive jack Q Press the RANGE button until symbol appears in the display Touch the test probe tips to the circuit or wire you wish to check If the resistance is less than approximately 100Q the audible signal will sound The display will also show the actual resistance 14 Diode Test WARNING To avoid electric shock do not test any diode that has voltage on it Set the function switch to gt position 2 Press the RANGE button until the symbol appears in the display 3 Insert the black test lead banana plug into the negative jack COM and the red test lead banana plug into the positive jack Q 4 Touch the test probe tips to the
6. USER S MANUAL Multimeter True RMS Auto ranging DMR 6550 CIRCUIT TEST ELECTRONICS www circuittest com Introduction This meter measures AC DC Voltage AC DC Current Resistance Capacitance Frequency Diode Test Continuity plus Thermocouple Temperature Proper use and care of this meter will provide many years of reliable service Safety device indicates that the operator must refer to an explana tion in the Operating Instructions to avoid personal injury or damage to the meter WARNING This WARNING symbol indicates a potentially hazardous situation which if not avoided could result in death or serious injury I This symbol adjacent to another symbol terminal or operating This CAUTION symbol indicates a potentially hazardous situ CAUTION ation which if not avoided may result damage to the product must not be connected to a circuit point at which the voltage with respect to earth ground exceeds in this case 500 VAC or VDC m This symbol advises the user that the terminal s so marked This symbol adjacent to one or more terminals identifies them A as being associated with ranges that may be subjected to particularly hazardous voltages For maximum safety the meter and test leads should not be handled when these terminals are energized IO Double Insulation SAFETY INFORMATION Caution and proper guidelines mustbe followed for personal and product safety Read this instructio
7. V Fuse Note Accuracy is given at 18 C to 28 C 65 F to 83 F lt 70 RH Resistance Range Resolution Accuracy 600 00 0 10 1 2 of reading 4 digits 6 000kQ 10 1 0 of reading 2 digits 60 00kQ 100 I 1 2 of reading 2 digits 600 0kQ 1000 6 000MO 1kQ 2 0 of reading 2 digits 60 00MQ 10kQ 5 0 of reading 10 digits Capacitance Auto ranging Range Resolution Accuracy 40 00nF 10pF 5 0 of reading 50 digits 400 0nF 0 1nF i pro soor nF L i 40 00uF 10nF 400 0uF 0 1uF 5 0 of reading 5 digits 4000uF 1uF 5 0 of reading 5 digits Frequency Auto ranging Range Resolution Accuracy 9 999Hz 0 001Hz 1 5 of reading 5 digits 99 99Hz 0 01Hz 999 9Hz 0 1Hz 9 999kHz 1Hz E mi 1 2 of reading 3 digits 99 99kHz 10Hz 999 9kHz 100Hz 10MHz 1kHz 1 5 of reading 4 digits Sensitivity gt 0 5V RMS while lt 1 MHz Sensitivity gt 3V RMS while gt 1MHz Duty Cycle Range Resolution Accuracy 0 1 99 9 0 1 1 2 of reading 2 digits Pulse width gt 100us lt 100ms Frequency width 5Hz 150 kHz Sensitivity gt 0 5V RMS Temperature Range Resolution Accuracy 20 C 760 C 1 C p 3 of reading 5 C 9 F 4 F 1400 F 1 F Sensor Type K Thermocouple Diode Test Range Resolution Accuracy 0 3mA typical 1 mV 10 of rea
8. al ranging does not apply for Capacitance Frequency functions 10 MAX MIN NOTE When using the MAX MIN function in Autoranging mode the meter will lock into the range that is displayed on the LCD when MAX MIN is activated If a MAX MIN reading exceeds that range an OL will be displayed Select the desired range BEFORE entering MAX MIN mode 1 Press the MAX MIN key to activate the MAX MIN recording mode The display icon MAX will appear The meter will display and hold the maximum reading and will update only when a new max occurs 2 Press the MAX MIN key again and the display icon MIN will appear The meter will display and hold the minimum reading and will update only when a new min occurs 3 To exit MAX MIN mode press and hold the MAX MIN key for 2 seconds Display Backlight Press and hold the HOLD key for gt 1 second to turn on or off the display backlight function The backlight will automatically turn off after 10 seconds HOLD The hold function freezes the reading in the display Press the HOLD key momentarily to activate or to exit the HOLD function 11 DC Voltage Measurements CAUTION Do not measure DC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter Set the function switch to the V position 2 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into t
9. ding 5 digits Open circuit voltage 1 5V dc typical Audible continuity Audible threshold Less than 1000 Test current lt 0 3mA Operating Instructions WARNING Risk of electrocution High voltage circuits both AC and DC are very dangerous and should be measured with great care 1 ALWAYS turn the function switch to the OFF position when the meter is not in use This meter automatically shuts OFF after 15 minutes of inactivity 2 If OL appears in the display during a measurement the value exceeds the range you have selected Change to a higher range NOTE On some low AC and DC voltage ranges with the test leads not con nected to a device the display may show a random changing reading This is normal and is caused by the high input sensitivity The reading will stabilize and give a proper measurement when connected to a circuit Autoranging Manual Range Selection When the meter is first turned on it automatically goes into Autoranging This automatically selects the best range for the measurements being made and is generally the best mode for most measurements For measurement situations requiring that a range be manually selected perform the following Press the RANGE key The AUTO display indicator will turn off 2 Press the RANGE key to step through the available ranges until you select the range you want 3 To exit Manual Ranging press and hold RANGE key for 2 seconds NOTE Manu
10. e fuse cover Turn off the meter and disconnect both test leads from the meter 2 Remove the two screws securing the battery fuse cover and remove the battery 3 Remove the old fuse from its holder by gently pulling it out Replace with fuse of proper size and value 10A 250V fast blow only Replace the battery and the cover and tighten the screws WARNING To avoid electric shock do not operate your meter until the fuse door is in place and fastened securely sg 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 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 war ranties of merchantability or the fitness for any particular purpose M DMR 6550 07R13 16
11. g Temperature Storage temperature Fuse Battery Dimensions Weight Enclosure Safety Approvals 6000 counts LCD display Automatic negative polarity indication 7 8MQ OL mark indication True RMS EJ is displayed if the battery voltage drops below operating voltage 2 times per second nominal Automatically shuts down after approx 15 minutes of inactivity 0 C to 50 C 32 F to 122 F at lt 70 relative humidity 20 C to 60 C 4 F to 140 F at lt 80 relative humidity 10A 250V Fuse Fast blow 5x20mm One 9V NEDA 1604 battery 150 H x 70 W x 48 D mm Approx 255g Double molded This meter is UL and CUL approved and con forms to IEC61010 1 for Overvoltage Category CAT III 600V and CAT Il 1000V DC Voltage Range Resolution Accuracy 600 0mV 0 1mV 0 5 of reading 2 digits 6 000V imV 60 00V 10mV 1 2 of reading 2 digits 600 0V 100mV 1000V 1V 1 5 of reading 2 digits AC Voltage Range Resolution Accuracy 6 000V 1mV 1 5 of reading 10 digits 60 00V 10mV i 1 5 of reading 10 digits 600 0V 100mV 1000V 1V 2 0 of reading 10 digits DC Current Range Resolution Accuracy 6A 1mA i DE 2 5 of reading 5 digits 10A 10mA AC Current Range Resolution Accuracy 6A 1mA 3 0 of reading 5 digits 10A 10mA Overload Protection 10A 250
12. he positive V jack 3 Touch the test probe tips to the circuit under test Be sure to observe the correct polarity red lead to positive black lead to negative 4 Read the voltage in the display AC Voltage Measurements WARNING Risk of Electrocution The probe tips may not be long enough to contact the live parts inside some 240V outlets for appliances because the contacts are recessed deep in the outlets As a result the reading may show 0 volts when the outlet actually has voltage on it Make sure the probe tips are touching the metal contacts inside the outlet before assuming that no voltage is present CAUTION Do not measure AC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter Set the function switch to the V position 2 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive V jack 3 Touch the test probe tips to the circuit under test Read the voltage in the display 2 DC Current Measurements CAUTION Do not make current measurements on the 10A scale for longer than 30 seconds Exceeding 30 seconds may cause damage to the meter and or the test leads Insert the black test lead banana plug into the negative COM jack 2 For DC current measurements set the function switch to the 10A posi tion and insert the red test lead banana plug into the 10A jack 3 Remove
13. n manual carefully and completely before using the meter Lack of caution or poor safety practices can result in serious injury or death Always start with power off Set the function switch to the correct setting before making any measurements and do not change position of the func tion switch during measurements Do not use the meter if the meter or test leads look damaged or if there is doubt that the meter is not operating properly When using the test probes always keep fingers behind the finger guards Never touch the exposed probe tip Always consider circuits to be energized Never assume any equipment to be de energized Use caution when working above 35VDC or 25VAC RMS as these volt ages pose a shock hazard 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 or diode tests Always turn off the power to the circuit under test before unsoldering or breaking the circuits Small amount of current can be dangerous Disconnect test leads before removing the batteries or the fuse Do not operate the unit unless the case is completely closed SAFETY INSTRUCTIONS This meter has been designed for safe use but must be operated with caution The rules listed below must be carefully followed for safe operation 1 NEVER apply voltage or current to the meter that exceeds the specified
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