USER MANUAL Mini Analog MultiMeter Model 38073A Please visit www.extech.
Introduction Thank you for selecting the Model 38073A Mini Analog MultiMeter. The 38073A measures AC/DC Voltage, DC mA Current, Resistance, dB, and 1.5V/9V batteries. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.com) to check for the latest version of this User Manual, Translations, Product Updates, Product Registration, and Customer Support.
To avoid electric shock, replace batteries when necessary. Disconnect power to the circuit under test and discharge all capacitors before testing resistance. Do not use the meter in the presence of explosive gas or vapor. To reduce risk of fire or electric shock, do not use the meter if it is wet. Individual protective equipment should be used if HAZARDOUS LIVE parts in the installation where measurements are to be carried out could be accessible.
Display Description 1. 2. 3. 4. 5. 6. Resistance Ohms (Ω) measurement scale Voltage / DC mA measurement scale 10V AC measurement scale Battery Test measurement scale Decibel (dB) measurement scale dB conversion chart Operating Instructions WARNING: Risk of electrocution. High-voltage circuits are extremely dangerous and should be measured with care.
AC/DC Voltage Measurements CAUTION: Do not measure voltages higher than 300V. Damage may occur to the meter. 1. Set the function switch to the correct AC/DC voltage range. 2. Insert the black test lead into the COM input and the red test lead into the VmAΩ input. 3. For DC, touch the black test lead to the negative side of the circuit under test and touch the red test lead to the positive side. For AC, the test lead polarity is not a factor. 4.
Resistance Measurements WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking resistance measurements. 1. Before testing resistance, test the condition of the battery: a. Set the function switch to ΩX1K or ΩX10 position. b. Short the test leads. The needle deflects to the right side. c. Keep the test leads shorted. Turn the 0 Ω adjustment dial (6) until the needle reads zero Ω. d. If the needle will not zero, replace the battery. 2.
Decibel (dB) Measurements The decibel scale measures the milliwatt power dissipation on a 600Ω load by measuring the voltage across the load. An AC voltage of 0.775Vrms across 600Ω is equal to 1mW or “0” dB. 1. Insert the black test lead into the COM input and the red test lead into the VmAΩ input. 2. Set the function switch to the desired AC voltage range and read the decibel measurement on the bottom (red) scale. 3.
Specifications Specifications stated for ambient conditions 23oC ±2oC (73.4oF ±3.6oF); Relative Humidity < 60% Function Range Accuracy AC Voltage 10 / 50 / 250 / 300 VAC ± 5% of Full Scale DC Voltage 2.5 / 10 / 50 / 250 / 300 VDC ± 4% of Full Scale DC Current 10 / 250 mA ± 4% of Full Scale Resistance Rx10 / Rx1K ± 4% of Full Scale Battery Test 1.5V / 9V Decibels -20dB to +22dB (AC Voltage range 10V) Sensitivity 10kΩ per 1VDC / 4.
