Brother HD-390I Operator's Instruction Manual

Professional analogue multimeter

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MODEL: HD-390I

Professional Analogue Multimeter

With robust Holster & reliable Protection

Operator's Instruction Manual

READ AND UNDERSTAND THIS

MANUAL BEFORE USING THE

INSTRUMENT

Failure to understand and comply with the

WARING and operating Instructions can

result in serious or fatal injuries and /or

property damage.

Table of Contents

Summary of Contents for Brother HD-390I

Page 1 MODEL: HD-390I Professional Analogue Multimeter With robust Holster & reliable Protection Operator’s Instruction Manual READ AND UNDERSTAND THIS MANUAL BEFORE USING THE INSTRUMENT Failure to understand and comply with the WARING and operating Instructions can result in serious or fatal injuries and /or...
Page 2: Brief Introduction
BRIEF INTRODUCTION This Multimeter is an accurate， safe， battery operated， rear tilt-stand， easy to operate handheld instrument with robust protective holster alongside and the adjustable back tilt device with hook-up design. It can offer accurate， reliable measurements of DCV & +/-DCV， ACV RMS & Peak-to-Peak， DC Current， Resistance with very high sensitive quality movement，...
Page 3 Test Range Accuracy Remarks Functions  3% FSD. DC V 0-0.1-2.5-10-50- Input Impendence:  4% FSD. 250-1000V 20KΩ/V Overload For 1000V Protection: Max. 1000V AC/DC BUT 0.1V/2.5V/10V 250V Max. Input Impedance: 40KΩ/V  5% FSD. Null DCV ± -5V， ± 25V Overload 1000V Max.
Page 4 Midscale at 0KΩ X10K: 2K~20MΩ Midscale at 200KΩ Capacitan 2,000uF(C) Approx. Use the R x 1K range ce (uF) Value IR Data The LED Red Light can be lit and Infrared 90±15°, < 50cm flashing if remote control works well Check AC Live AC Live...
Page 5 Scale/Value Readings Reference Table on Dial Plate Test Function Range Scale/Value for reading Multiplied ×1 ×1 Blue Ω Line ×10 ×10 ×100 ×100 Resistance(Ω) ×1K ×1000 ×10K ×10000 Black Line V.A DC 0.1V Value 10(50/10) ×0.01 2.5V ×0.01 10(50/10) ×1 DC Volt(V) 50(50/10) ×1...
Page 6 250mA ×1 10(50/10) ×1 Black Line V.A AC 10V Value 10(50/10) ×1 AC Vrms 50(50/10) ×1 250V ×1 1000V 10(50/10) ×100 Red Scale Line AC 10V Value 28 ×1 AC Vp-p ×2 250V ×10 1000V ×100 C(uF) Black Scale Line Capacitance (Rx1k）...
Page 7: Before Operating
Black， negative test lead. (+) Jack: Plug-in connector at the lower right on the panel for Red， positive test lead. OPERATING INSTRUCTIONS CAUTION When making voltage or current measurements， develop the habit of turning off all power to the circuit under test. Connect the test leads at the desired points in the circuit，...
Page 8: Operation Procedures
or damp places. Although very rugged， the meter is a sensitive measuring device and should be handled carefully & properly. 7. Do not check resistance， transistor， diode， LED， or capacitance when live voltage or current input across the circuit. 8. When the meter is not in use， keep the selector switch to the “OFF”...
Page 9: Ac Voltage Measurement
5. Check the needle position and get the reading on the 2 scale below. Null DCV (Central Zero) Measurement At these two ranges， it can automatically judge the polarity of circuit as the pointer can move to the center line and become a Null meter.
Page 10: Dc Current Measurement
AC Vp-p: 1. Set the selector switch to the appropriate Red ACV range in the parentheses (28， 70x2， 700， 2800); and connect the test leads across the circuit or load under measurement. (Polarity of the test probes is unimportant.) 2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the“+”...
Page 11: Resistance Measurement
Note: If connected incorrectly with the voltage at these ranges， quickly remove the test leads from the circuit as to avoid damage to this tester. (This tester can afford the voltage <250V DC/AC rms. for the period of 5 seconds max.) Resistance Measurement WARNING: DO NOT APPLY VOLTAGE TO MEASURING TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION.
Page 12: Continuity Buzzer Test
NOTE: To test the diode while current below 0.060 mA at X 10K range; current below 0.15 mA at X 1K range; current below 1.5 mA at X 100 range; current below 15 mA at X 10 range; current below 150 mA at X 1 range. 2.
Page 13 separately into the proper holes of the socket on the front panel. 3. Read the approximate hFE Value directly at the hFE scale. Note: Current 10μA. VCE 2.8V. 4. When the Base terminal cut， the value of Leak is Iceo for Transistor.
Page 14: Capacitance Measurement
Set the selector switch to AC 10V range. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the Red “+” jack. Connect the test leads to the measuring circuit specially in series with a 0.047μF/400V Metalized Polyester Capacitor. And then read the bottom Red dB scale.
Page 15: Troubleshooting
Troubleshooting Nevertheless， problems or malfunctions may occur. For this reason， the following is a description of how you can eliminate possible malfunctions yourself: Error Possible cause The multimeter does Are the batteries exhausted? Or the not work. inner batteries bad contacted? Check the status of the batteries and if the fuse 0.5A is good or contacted well.
Page 16: Maintenance
MAINTENANCE Replacement for Battery and/or Fuse should only be done after the test leads have been disconnected and POWER OFF. 1. Battery Replacement 1). Note the condition of the batteries using the procedure described above， if the battery needs to be replaced， remove the screw and open the upper cover of the battery cabinet on the rear case.