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ATP Instrumentation DM-921 Operating Instruction

Autoranging multimeter
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OPERATING INSTRUCTION

AUTORANGING MULTIMETER
MAX
AUTO
C F
DC
AC
Mode
Range
C F
Ω
V
V
μ
V
¦¸
10A
COM
μ
MAX
every
15 min.

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Summary of Contents for ATP Instrumentation DM-921

  • Page 1: Operating Instruction

    OPERATING INSTRUCTION AUTORANGING MULTIMETER AUTO Mode Range Ω μ ¦¸ μ every 15 min.

  • Page 2: Safety Information

    SAFETY INFORMATION The following safety information must be observed to insure maximum personal safety during the operation at this meter:  Do not use the meter if the meter or test leads look damaged, or if you suspect that the meter is not operating properly. ...

  • Page 3: Safety Symbols

    on the front of the meter.  Never apply voltage or current to the meter that exceeds the specified maximum: SAFETY SYMBOLS This symbol adjacent to another symbol, terminal or operating device indicates that the operator must refer to an explanation in the Operating Instructions to avoid personal injury or damage to the meter.

  • Page 4: Controls And Jacks

    This symbol adjacent to one or more terminals identifies 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.
  • Page 5 COM (negative) input jack 10A (positive) input jack for 10A DC or AC measurements Mode pushbutton: selection Continuity/Diode, AC/DC, Temperature(C/F) Range pushbutton Data Hold pushbutton MAX. Hold pushbutton AUTO Mode Range Ω μ ¦¸ μ every 15 min.

  • Page 6: Symbols And Annunciators

    SYMBOLS AND ANNUNCIATORS Continuity Low Battery Diode DATA HOLD Data Hold AUTO AutoRanging Alternating Current or Voltage Direct Current or Voltage SPECIFICATIONS The instrument complies with: EN61010-1. Insulation: Class2, Double insulation. Overvoltage category: CATIII 600V, CATII 1000V. Display: 2000 counts LCD display with function indication. Polarity: Automatic, (-) negative polarity indication.
  • Page 7 Operating environment: 0 o C to 50 o C (32 o F to 122 o F) at < 70 % relative humidity. Storage temperature: -20 o C to 60 o C (-4 o F to 140 o F) at < 80 % relative humidity.
  • Page 8 AC Voltage (Auto-ranging except 200mV) Range Resolution Accuracy 200.0mV 0.1mV +1.5%of rdg + 30 dgts 2.000V +1.2% of rdg + 3 dgts 20.00V 10mV +1.5% of rdg + 3 dgts 200.0V 100mV 600V(CATIII) +2.0% of rdg + 4 dgts 1000V(CATII) +2.0% of rdg + 8 dgts Input Impedance: 10M.
  • Page 9 Range Resolution Accuracy 200.0uA 0.1uA +1.5% of rdg + 5 dgts 2000uA +1.8% of rdg + 5 dgts 20.00mA 10uA 200.0mA 100uA 10mA +3.0% of rdg + 7 dgts Overload Protection: 0.2A / 250V and 10A / 250V Fuse. Frequency Range: 50 to 60 Hz Maximum Input: 200mA dc or 200mA ac rms on uA / mA ranges, 10A dc or ac rms on 10A range.
  • Page 10 200A 0.1A +1.5% of rdg +3dgts (meter only, Clamp-on Adaptor accuracy not 2000A included) Sensor: Clamp-on Adaptor (Note: not provide) 200A Range Input Sensitivity: 1mV/A 2000A Range Input Sensitivity: 1mV/A Frequency Range: 50 to 60 Hz Overload protection: 500V dc or ac rms.. Resistance (Auto-ranging) Range Resolution...

  • Page 11: Operation

    Diode Test Test current Resolution Accuracy 0.3mA 1 mV +10% of rdg + 5 dgts typical Open circuit voltage: 1.5V dc typical Overload protection: 500V dc or ac rms. Audible continuity Audible threshold: Less than100 Test current: <0.3mA Overload protection: 500V dc or ac rms. OPERATION WARNING: Risk of electrocution.

  • Page 12: Mode Button

    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 connected 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.

  • Page 13: Data Hold Button

    DATA HOLD BUTTON The Data Hold function allows the meter to "freeze" a measurement for later reference. Press the DATA HOLD button to “freeze” the reading on the indicator. The indicator “HOLD” will be appear in the display. Press the DATA HOLD button to return to normal operation. MAX HOLD BUTTON The max.

  • Page 14: Ac Voltage Measurements

    the correct polarity (red lead to positive, black lead to negative). Read the voltage in the display. The display will indicate the proper decimal point and value. If the polarity is reversed, the display will show (-) minus before the value. AC VOLTAGE MEASUREMENTS WARNING: Risk of Electrocution.

  • Page 15: Dc Current Measurements

    4. Read the voltage in the display. The display will indicate the proper decimal point, value and symbol (AC, V, etc.). 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.

  • Page 16: Ac Current Measurements

    8. Apply power to the circuit. 9. Read the current in the display. The display will indicate the proper decimal point, value and symbol. 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.
  • Page 17 the point where you wish to measure current. 7. 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. 8. Apply power to the circuit. 9.

  • Page 18: Resistance Measurements

    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. 1. Set the function switch to the  position. 2.

  • Page 19: Diode Test

    If the resistance is less than approximately 30, the audible signal will sound. The display will also show the actual resistance. DIODE TEST WARNING: To avoid electric shock, do not test any diode that has voltage on it. 1. Set the function switch to position.

  • Page 20: Temperature Measurements

    TEMPERATURE MEASUREMENTS WARNING: To avoid electric shock, disconnect both test probes from any source of voltage before making a temperature measurement. If you wish to measure temperature in F, set the function switch to F range. If you wish to measure temperature in C, set the function switch to the C range.

  • Page 21: Replacing The Battery

    REPLACING THE BATTERY WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the battery door. When the batteries become exhausted or drop below the operating voltage, “BAT” will appear in the right-hand side of the LCD display. The battery should be replaced.

  • Page 22: Replacing The Fuses

    4. Put the battery door back in place. Secure with the two screws. WARNING: To avoid electric shock, do not operate the meter until the battery door is in place and fastened securely. NOTE: If your meter does not work properly, check the fuses and battery to make sure that they are still good and that they are properly inserted.

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