UEi Test Instruments M1K - Manual (Page 2)

Introduction
The M1K gives you an easy and economical way to troubleshooting
electrical circuits. Its nine voltage scales give you high resolution all
the way up to 500 volts AC or DC while its milliamps and microamps
feature lets you check thermocouple and control circuits.
Features include
• 14 ranges
• 500 Volts AC and DC
• Resistance to 500 kilohms
• DC milliamps
• Decibel measurements
• Color-coded and mirrored scale plate
Safety Notes
Before using this meter, read all safety information carefully. In
this manual the word "WARNING" is used to indicate conditions
or actions that may pose physical hazards to the user. The word
"CAUTION" is used to indicate conditions or actions that may
damage this instrument.
• Always follow industry standard safety practices including protective
clothing, gloves and safety glasses when appropriate
• Do not attempt to measure any voltage that exceeds the
ca t e g o ry based rating of this meter
• Do not attempt to use this meter if either the meter or the test
leads have been damaged. Turn it in for repair at a qualified
repair facility
• Ensure meter leads are fully seated by making a quick continuity
check of the leads prior to making voltage measurements
• Keep your fingers away from the test lead’s metal probe
contacts when making measurements. Always grip the leads behind
the finger guards molded into the probes
• Use a current clamp adapter when measuring current that may
exceed 10 amps. See the accessories in UEi’s full-line ca t a l o g
• Do not open the meter to replace batteries or fuses while the
probes are connected
Operating Instructions
AC Voltage
Insert one test lead in the (+) jack. Insert the other test lead in the (-) jack.
Set the function switch to the appropriate AC voltage.
NOTE: Always start with the 500V range if unsure of the magnitude of
voltage present.
CAUTION!
Always remove the test leads from the circuit under test before
disconnecting from front panel of M1K.
DC Voltage
Insert the black test lead in the “-” jack. Insert the red test lead in the “+”
jack. Set the function switch to the appropriate DC voltage. The red test
lead is connected to the positive voltage point. The black test lead is
connected to the negative voltage point.
NOTE: Always start with the 500V range if unsure of the magnitude of
voltage present.
CAUTION!
Always remove the test leads from the circuit under test before
disconnecting from front panel of M1K.
Direct Current
The M1K may be used to measure direct current up to a maximum of 250
mA (0.250 Amps). To do this, the M1K must be connected in series with
the wire, or circuit element, in which the current is to be measured.
Remove power to the circuit under test before connecting the M1K. Set
the function switch to the appropriate “m A” position. Insert the black
test lead in the “-” jack on the M1K and connect it to the ground, or low
voltage, side of the circuit under test. Insert the red test lead in the “+”
jack on the M1K and connect it to the high voltage side of the circuit
under test. Apply power to the circuit under test.
Resistance
CAUTION!
Always remove the power to any circuit in which resistance
measurements are to be made.
The M1K uses an internal battery to supply power to the circuit under
test. Access to the battery is provided by removing the single screw in the
back of the case and removing the case back. Observe polarity marking
on battery.
Set the function switch to the appropriate OHMS setting Rx10 or Rx1K.
Insert one test lead in the “-” jack and the other test lead in the “+” jack.
touch the free ends of the test leads together and note that the pointer
will swing to the right side of the pointer will swing to the right side of
the scale. (Note: If the pointer does not move all the way to the right
the battery may be weak and need replacing. If no reading can be
made, check battery). Use the “OHM ADJ” knob on the left side of
the instrument to set the pointer to zero on the green meter scale. This
completes the calibration of the resistance measuring circuit. This test
should be performed each time resistance tests are to be made to
assure that the “OHM ADJ” knob has not been inadvertently moved.
To make the resistance measurement, connect the free ends of the
test leads across the element to be measured. The measured resistance
value will be the green numeral on the resistance scale times the
resistance multiplier. For example, if the function switch is on Rx10
and the pointer is on the numeral 20, the resistance is 200 ohms (10 x
20 = 200).
M1K-MAN P. 1