Sealey MM19 - Manual (Page 5)

Original Language Version
5.1. REPLACING THE BATTERY

WARNING! To avoid electric shock, disconnect the test leads from any source of voltage before removing the battery door.
5.1.1. When the battery becomes exhausted the battery should be replaced.
5.1.2. Follow instructions for installing battery. See the Battery Installation section of this manual (page 2).
Dispose of the old battery properly.
 WARNING! To avoid electric shock, do not operate your meter until the battery cover is in place and fastened securely.
5.2. REPLACING THE FUSES

WARNING! To avoid electric shock, disconnect the test leads from any source of voltage before removing the fuse cover.
 WARNING! Before attempting to open the case, ensure that the test leads have been disconnected from the multimeter
and that it is switched off to avoid electric shock hazard.
5.2.1. Disconnect the test leads from the meter and any item under test.
5.2.2. Open the fuse cover by loosening the screw on the cover using a Phillips head screwdriver.
5.2.3. Remove the old fuse from its holder by gently pulling it out.
5.2.4. Install the new fuse into the holder.
5.2.5. Always use a fuse of the proper size and value (200mA/250V).
5.2.6. Replace the fuse cover back in place. Insert the screw and tighten it securely.

WARNING! To avoid electric shock, do not operate your meter until the fuse cover is in place and fastened securely.
5.3. Clean the multimeter’s casing using a slightly dampened cloth and mild detergent - do not use any abrasives or solvents.
Clean the inside of each terminal using a swab soaked in isopropyl alcohol, use a new swab to apply a light coat of
machine oil to each terminal.
5.4. If the multimeter is to be stored for a long period of time, remove the battery first to avoid any damage.
4.5. AUDIBLE CONTINUITY CHECK

WARNING! To avoid electric shock, never measure continuity on circuits or wires that have voltage on them.
4.5.1. Set the function switch to the / •))) position.
4.5.2. Insert the black lead banana plug into the negative (COM) jack. Insert the red test lead banana plug into the positive (Ω)
jack.
4.5.3. Touch the test probe tips to the circuit or wire you wish to check.
4.5.4. If the resistance is less than approximately 100Ω, the audible signal will sound.
4.6. DIODE TEST
4.6.1. Red test lead to “V.Ω.mA”, Black lead to “COM”.
4.6.2. RANGE switch to position.
4.6.3. Connect the red test lead to the anode of the diode to be measured and black test lead to cathode.
4.6.4. The forward voltage drop in mV will be displayed. If the diode is reversed, figure “1” will be shown.
4.7. TRANSISTOR hFE MEASUREMENT
4.7.1. RANGE switch to the hFE position.
4.7.2 . Determine whether the transistor is NPN or PNP type and locate the Emitter, Base and Collecter leads. Insert the leads into
the proper holes of the hFE Socket on the front panel.
4.7.3. The meter will display the approximate hFE value at the condition of base current 10mA and VCE 2.8 V.
5. MAINTENANCE
© Jack Sealey Limited MM19.V3 Issue No: 5(I) - 16/06/14