Morris 57044 Operating Instruction
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Morris 57044 Operating Instruction

Autoranging multimeter
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MODEL 57044
OPERATING INSTRUCTION
AUTORANGING MULTIMETER

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Summary of Contents for Morris 57044

  • Page 1 MODEL 57044 OPERATING INSTRUCTION AUTORANGING MULTIMETER...

  • 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

    SAFETY SYMBOLS Indicates operators must refer to the explanation in this manual. Indicates terminals at which dangerous voltage may be present. SPECIFICATIONS Display: 4000 counts LCD display with function indication. Polarity: Automatic, (-) negative polarity indication. Over range: “OL” mark indication. Low Battery Indication: “BAT”...
  • Page 4 Accuracy is given at 23 C to 5 C, less than 70 % RH. DC Voltage (Auto-ranging) Range Resolution Accuracy 400.0mV 0.1mV +0.8% of rdg + 2 dgts 4.000V +0.5% of rdg + 2 dgts 40.00V 10mV 400.0V 100mV 600V +1.0% of rdg + 2 dgts Input Impedance: 10MΩ.
  • Page 5 DC Current (Auto-ranging for µA and mA) Range Resolution Accuracy 400.0µA 0.1µA 4.000mA 1µA +1.5% of rdg + 3 dgts 40.00mA 10µA 400.0mA 100µA 10mA +2.0% of rdg + 5 dgts Overload Protection: 0.5A / 250V and 10A / 250V Fuse. Maximum Input: 400mA dc or 400mA ac rms on µA / mA ranges, 10A dc or ac rms on 10A range.
  • Page 6 Resistance (Auto-ranging) Range Resolution Accuracy 400.0Ω 0.1Ω +0.8% of rdg + 4 dgts 4.000kΩ 1Ω 40.00kΩ 10Ω +0.8% of rdg + 2 dgts 400.0kΩ 100Ω 4.000MΩ 1kΩ 40.00MΩ 10kΩ +1.2% of rdg + 3 dgts Input Protection: 250V dc or 250V ac rms. Capacitance (Auto-ranging) Range Resolution...
  • Page 7 Frequency (Auto-ranging) Range Resolution Accuracy 9.999Hz 0.001Hz +1.0% of rdg + 5 dgts 99.99Hz 0.01Hz 999.9Hz 0.1Hz 9.999kHz +0.8% of rdg + 3 dgts 99.99kHz 10Hz 999.9kHz 100Hz 9.999MHz 1kHz +1.5% of rdg + 4 dgts Sensitivity: 0.8V RMS min. at >20% and <80% duty cycle. Effect Reading: More than 100 digits at pulse width >2µSec.

  • Page 8: Operation

    OPERATION Before taking any measurements, read the Safety Information Section. Always examine the instrument for damage, contamination (excessive dirt, grease, etc.) and defects. Examine the test leads for cracked or frayed insulation. If any abnormal conditions exist do not attempt to make any measurements. AC/DC OR OHM/DIODE/CONTINUITY OR Hz/% SELECTING BUTTON: Push this button to select AC/DC current measuring function...

  • Page 9: Measuring Voltage

    DATA HOLD BUTTON: When this button is pushed, the display will show the last reading and "HOLD" symbol will appear until pushing it again. Data holding will be canceled automatically when the function switch is rotated. RELATIVE ZERO BUTTON: For convenient readings, comparison & offset. FUNCTION / POWER SWITCH: Switch for changing the measurement function and power on and off.

  • Page 10: Measuring Current

    MEASURING CURRENT 1. Connect the black test lead to the COM jack and the red test lead to the “+” jack for a maximum of 400mA. For a maximum of 10A, move the red lead to the “10A” jack. 2. Set the function switch at µA, mA or A range to be used and push DC/AC button to select DCA or ACA measuring mode.

  • Page 11: Diode Test

    DIODE TEST 1. Connect the black test lead to the COM jack and the red test lead to the “+” jack. 2. Set the function switch to OHM/DIODE/CONTINUITY •))) (Ω/ 3. Make sure all the power is OFF. 4. To select diode test, touch the mode selection switch (OHM/DIODE/CONTINUITY) and the "DIODE"...

  • Page 12: Measuring Capacitance

    MEASURING CAPACITANCE 1. Connect the black test lead to the COM jack and the red test lead to the “+” jack. (NOTE: The polarity of the lead connection is positive "+"). 2. Connect test leads across the capacitor under measurement and be sure that the polarity of connection is observed.

  • Page 13: Measuring Duty Cycle

    MEASURING DUTY CYCLE 1. Connect the black test lead to the COM jack and the red test lead to the “+” jack. 2. Set the function switch to "Hz/% Duty”. 3. Push the “Hz/%” button changing the function to % Duty Cycle.

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