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User Manual
MM650 CAT IV True RMS Digital
Multimeter with LoZ
Introduction
The Triplett MM650 features True RMS measurements for more
accurate AC readings and a Low Z setting for eliminating false
readings caused by “ghost” voltages. Functions include AC/DC
voltage and current, resistance, continuity, capacitance, frequency,
duty cycle, temperature, and diode test. The MM650 also offers the
added convenience of a built-in LED flashlight. This meter is fully
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tested and calibrated and, with proper use, will provide many years
of reliable service.
WARNINGS
• Read, understand and follow Safety Rules and Operating
Instructions in this manual before using this meter.
• The meter’s safety features may not protect the user if not
used in accordance with the manufacturer’s instructions.
• Ensure that the test leads are fully seated in the input jacks
and keep fingers away from the metal probe tips when taking
measurements.
• Before changing functions using the selector switch, always
disconnect the test leads from the circuit under test.
• Use only UL listed test leads with the proper safety category rating.
• Comply with all applicable safety codes. Use approved
personal protective equipment when working near live
electrical circuits - particularly with regard to arc-flash
potential.
• Use caution on live circuits. Voltages above 30 V AC rms, 42 V
AC peak, or 60 V DC pose a shock hazard.
• Do not use if the meter or test leads if appear to be damaged.
• Verify operation before using meter by measuring a known live
voltage.
• Do not use the meter in wet or damp environments or during
electrical storms.
• Do not use the meter near explosive vapors, dust or gasses.
• Do not use the meter if it operates incorrectly. Protection
may be compromised.
• Do not operate meter while Low Battery warning is on.
Replace batteries immediately.
• Do not apply voltage or current that exceeds the meter’s
maximum rated input limits.
• When replacing the battery or fuses, be sure to secure the
battery compartment door firmly to maintain the waterproof and
dust proof integrity of the meter. Loose or overtightened screws,
or an improperly seated O-ring may compromise the meter's
water and dust ingress protection.
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International Safety Symbols
Potential danger. Indicates the user must refer to the manual for important safety information
Indicates hazardous voltages may be present
Equipment is protected by double or reinforced insulation
MAX
Indicates the terminal(s) so marked must not be connected to a circuit where the
1000V
voltage with respect to earth ground exceeds the maximum safety rating of the meter
Category Rating
Brief Description
Typical Applications
CAT II
Single phase receptacles
- Household appliances, power tools
and connected loads
- Outlets more than 30ft (10m) from a CAT III source
- Outlets more than 60ft (20m) from a CAT IV source
CAT III
Three phase circuits and
- Equipment in fixed installations such as 3-phase
single phase lighting
motors, switchgear and distribution panels
circuits in commercial
- Lighting circuits in commercial buildings
buildings
- Feeder lines in industrial plants
- Any device or branch circuit that is close to a CAT III source
CAT IV
Connection point to
- Primary distribution panels
utility power and outdoor
- Overhead or underground lines to detached buildings
conductors
- Incoming service entrance from utility
- Outdoor pumps
Safety Category Ratings
The measurement category (CAT) rating and voltage rating is determined by a combination of the meter, test probes
and any accessories connected to the meter and test probes. The combination rating is the LOWEST of any individual
component.
IP67 Rating
NOTE: Meter is waterproof and dust tight
with supplied plugs or test leads inserted
into input jacks.
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Meter Description
1. LCD display
2. RANGE button
3. REL button
4. MODE button
5. Rotary function switch
6. 10A input jack
7. µA, mA input jack
8. COM input jack
9. V/Ω/, Hz/ %, Diode,
Continuity, Cap, °C/F Input
Jack
10. HOLD/Backlight button
11. MAX/MIN/Average button
12. Flashlight/PEAK button
13. Flashlight
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Display Description
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Operating Instructions
RANGE Button
The Auto Range mode automatically selects the proper range for
the measurement being made and is generally the best mode for
most applications. For measurement situations requiring that a
range be manually selected, perform the following:
1. Momentarily press the RANGE button. The “AUTO”
indicator will no longer be shown on the LCD display.
2. Momentarily press the RANGE button to step through
the available ranges until the desired range is selected.
3. To exit the Manual Ranging mode, press and hold the
RANGE button until the “AUTO” indicator reappears.
NOTE: The range button does not work on Frequency,
Duty Cycle, Capacitance or Temperature.
MODE Button
Used to select AC or DC, Frequency or Duty Cycle,
Resistance, Continuity or Diode Test, and °C or °F.
REL button
The RELATIVE function zeros out the reading on the display and
stores it as a reference. Subsequent readings will be displayed as
the relative difference between the actual measurement and the
stored reference value. To activate, press the REL button. The
“REL” indicator will appear on the LCD display along with the
relative reading. Press the REL button again to return to normal
operation.
NOTE: The meter does not Auto Range when the Relative mode is
active. The display will read OL if the difference exceeds the range.
When this occurs, exit REL and use the RANGE button to select a
higher range. REL does not work on Frequency, Duty Cycle,
Temperature, Continuity or Diode Test.
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MAX/MIN/AVG Button
1. Momentarily press the MAX/MIN/AVG button to activate
the MAX/MIN/Average mode. “MAX” will appear on the
LCD display and the meter will display and hold the
highest reading. The meter will update the reading when
a higher “max” occurs.
2. Momentarily press the MAX/MIN/AVG button again to
view the lowest reading. “MIN” will appear on the LCD
display and the meter will display and hold the lowest
reading. The meter will update the reading when a lower
“min” occurs.
3. Momentarily press the MAX/MIN/AVG button once more
to view the average reading. The “AVG” symbol will
appear on the LCD display and the meter will display the
running average. The meter will update the reading when
the average value changes.
4. Press and hold the MAX/MIN/AVG button to end
MAX/MIN/Average and return to normal operation.
NOTE: The meter does not Auto Range when MAX/MIN/AVG is
active. The meter will display OL if the reading exceeds the range.
When this occurs, exit MAX/MIN/AVG and use the RANGE button
to select a higher range. MAX/MIN/ AVG does not work on
Frequency, Duty Cycle or Capacitance.
Flashlight/PEAK Button
Momentarily press the PEAK button to turn the flashlight on
and off.
The PEAK function is accessible when measuring AC
Voltage or Current. It captures and displays the highest
positive peak and the highest negative peak of the AC
waveform.
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1. Press and hold the PEAK button until “Peak MAX”
appears on the LCD display. The meter will display the
highest reading and will update the reading when a
higher positive peak occurs.
2. To view highest negative peak, press the PEAK
button for approximately one second. “Peak MIN” will
appear on the LCD display and the meter will display
and hold the highest reading. The meter will update the
reading when a higher negative peak occurs.
3. Press the PEAK button for approximately one second
to switch between Peak MAX and Peak MIN
readings.
4. Press and hold the PEAK button to exit PEAK and return
to normal operation.
NOTE: The meter does not Auto Range in the PEAK Mode. The
meter will display OL if the reading exceeds the range. When this
occurs, exit PEAK and use the range button to select a higher
range.
HOLD/Backlight Button
To freeze the reading on the LCD display, momentarily press
the HOLD button. The “HOLD” indicator will be displayed
while the reading is being held. Momentarily press the HOLD
button again to exit HOLD and return to normal operation.
To turn the backlight on, press and hold the HOLD button
until the backlight turns on.
To turn the backlight off, press and hold the HOLD button
until the backlight turns off.
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WARNING: Risk of electrocution. High-voltage
circuits, both AC and DC, are very dangerous and
should be measured with great care.
1. ALWAYS turn the function switch to the OFF position
when the meter is not in use.
2. If “OL” appears in the display during a
measurement, the value exceeds the range you
have selected. Change to a higher range.
AC/DC Voltage Measurements
1. Set the Rotary Switch to the position.
2. Press the MODE button to select AC or DC Voltage. The
AC or DC Symbol will appear on the LCD display.
3. Insert the black test lead into the COM jack and the red
test lead into the V input jack.
4. Touch the test leads to the circuit under test. If measuring
DC voltage, touch the red test lead to the positive side of
the circuit and the black test lead to the negative side of
the circuit.
5. Read the voltage on the LCD display.
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WARNING: Observe all safety precautions
when working on live voltages. Do not
measure frequency or % duty cycle on circuits
that exceed 600V.
WARNING: Observe all safety precautions
when working on live voltages. Do not
connect to circuits that exceed 600V when
the meter is set to Low Z. Do not use low Z
when testing circuits that could be harmed
by this function’s low input impedance
Frequency and % Duty Cycle Measurements
1. Set the rotary function switch to
the V HZ % position.
2. To select Frequency or % Duty
Cycle, press the MODE button
until the “Hz” or “%”symbol
appears on the LCD display.
3. Insert the black test lead into
the COM input jack and the red
test lead into the V input jack.
4. Touch the test lead probes to the circuit under test.
5. Read the frequency or % duty cycle on the LCD display.
Low Z AC/DC Voltage
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1. Set the rotary function switch to the Low Z position.
WARNING: Observe all safety precautions
when working on live circuits. Do not
measure current on circuits that exceed
1000V. Measurements in the 10A range
should be limited to 30 seconds maximum
every 15 minutes
2. Press the MODE button to select AC or DC voltage.
The AC “~” or DC “” symbol will appear on the LCD display.
3. Insert the black test lead into the COM input jack and the
red test lead into the V input jack.
4. Touch the test leads to the circuit under test. If measuring
DC voltage, touch the red test lead to the positive side of the
circuit and the black test lead to the negative side of the
circuit.
5. Read the voltage on the LCD display.
AC/DC Current Measurements
1. Insert the black test lead into the negative COM input jack.
2. For current measurements up to 10A,set the rotary
function switch to the 10A position and insert the red
test lead into the 10A input jack
3. For current measurements up to 600mA, set the rotary
function switch to the mA position and insert the red test
lead into the uA/mA input jack.
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4. For current measurements up to 6000 uA set the rotary
function switch to the uA position and insert the red test
lead into the uA/mA input jack.
5. Press the MODE button to select AC or DC current.
The AC “~” or DC “” symbol will appear on the LCD
display.
6. Remove power from the circuit under test, then open up
the circuit at the point where you wish to measure
current.
7. Touch the black test probe tip to the neutral side of the
circuit. Touch the red test probe tip to the “hot” side of
the circuit.
8. Apply power to the circuit.
9. Read the current on the LCD display.
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RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the
unit under test and discharge all capacitors before taking any
resistance measurements. Remove the batteries and unplug
the line cords.
1. Set the function switch to the Ω position.
2. Insert the black test lead banana plug into the negative
COM jack.
Insert the red test lead banana plug into the positive
jack.
3. Press the MODE button to indicate “ ” on the display.
4. Touch the test probe tips across
the circuit or part under test. It is
best to disconnect one side of the
part under test so the rest of the
circuit will not interfere with the
resistance reading.
5. Read the resistance in the display.
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure
continuity on circuits or wires that have voltage on them.
1. Set the function switch to the Ω position.
2. Insert the black lead banana plug into the negative COM
jack.
Insert the red test lead banana plug into the positive
jack.
3. Press the MODE button to indicate“ " and “Ω” on the
display
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4. Touch the test probe tips to the circuit or wire you wish
to check.
5. If the resistance is less than
approximately 35 , the audible
signal will sound. If the circuit is
open, the display will indicate
“OL”.
DIODE TEST
1. Set the function switch to the Ω position.
2. Insert the black test lead
banana plug into the
negative COM jack and
the red test lead banana
plug into the positive V
jack.
3. Press the MODE button to indicate “ “ and “V” on the
display.
4. Touch the test probes to the diode under test. Forward
voltage will typically indicate 0.400 to 0.700V. Reverse
voltage will indicate “OL”. Shorted devices will indicate near
0V and an open device will indicate “OL” in both polarities.
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the
unit under test and discharge all capacitors before taking any
capacitance measurements. Remove the batteries and
unplug the line cords.
1. Set the rotary function switch to the CAP position.
2. Insert the black test lead
banana plug into the
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negative COM jack. Insert
the red test lead banana
plug into the positive V jack.
3. Touch the test leads to the capacitor to be tested.
4. Read the capacitance value in the display
TEMPERATURE MEASUREMENTS
1. Set the function switch to the green Temp position.
2. Insert the Temperature Probe into the input jacks,
making sure to observe the correct polarity.
3. Press the MODE button to indicate “ºF” or “ºC”
4. Touch the Temperature Probe
head to the part whose
temperature you wish to
measure. Keep the probe
touching the part under test until
the reading stabilizes (about 30
seconds).
5. Read the temperature in the display.
Note: The temperature probe is fitted with a type K mini
connector. A mini connector to banana connector adaptor is
supplied for connection to the input banana jacks.
Note: The temperature range of the supplied thermocouple
probe is -20 to 250°C (-4 to 482°F)
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Battery Replacement
WARNINGS: To avoid electric shock, remove the
test leads from the meter before removing the battery/fuse
cover.
1. Lift up the tilt stand.
2. Loosen the Phillips
screw(s) on the battery/fuse
cover.
3. Remove the battery/fuse cover.
4. Replace the batteries with four
AAA batteries.
5. Observe polarity as shown
inside battery compartment.
6. Install the battery/fuse cover
and tighten the screw(s).
WARNING: To avoid electric shock, do not
operate the meter until the battery/fuse cover is
securely fastened to the meter.
WARNING: When replacing the battery or fuses, be sure to
secure the battery compartment door firmly to maintain the waterproof
and dust proof integrity of the meter. Loose or overtightened screws, or
an improperly seated o-ring may compromise the meter's water and
dust ingress protection.
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Fuse Replacement
WARNINGS: To avoid electric shock, remove the
test leads from the meter before removing the battery/fuse
cover.
1. Lift up the tilt stand.
2. Loosen the Phillips
screw(s) on the
battery/fuse cover.
3. Remove the battery/fuse cover.
4. Gently remove fuse and install
new fuse into the holder.
5. Always use a UL recognized
fuse of the proper size and
value: 800mA/1000V (6.3 x
32mm) fast blow for the
µA/mA ranges and 10A/1000V
(10 x 38mm) fast blow for the
10A range.
6. Install the battery/fuse cover
and tighten the screw(s).
WARNING: To avoid electric shock, do not
operate meter until the battery/fuse cover is securely
fastened to the meter.
WARNING: When replacing the battery or fuses, be sure to
secure the battery compartment door firmly to maintain the waterproof
and dust proof integrity of the meter. Loose or overtightened screws, or
an improperly seated O-ring may compromise the meter's water and
dust ingress protection.
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Specifications
Function
Range
Resolution
Accuracy ±
(% of reading + digits)
AC Voltage
6.000V
1mV
60.00V
10mV
±(1.0% +5 digits)
600.0V
0.1V
1000V
1V
±(1.5% +5 digits)
All AC voltage ranges are specified from 5% of range to 100% of range
Input Protection:
1000V AC RMS or 1000V DC
Input Impedance:
10MΩ
AC voltage bandwidth:
50 to 60Hz
Function
Range
Resolution
Accuracy ±
(% of reading + digits)
Low Z
6.000V
1mV
AC Voltage
60.00V
10mV
±(3.0% + 40 digits)
600.0V
0.1V
All AC voltage ranges are specified from 5% of range to 100% of range
Input Protection:
600V AC RMS or 600V DC
Input Impedance:
approx. 3kΩ
AC Response:
50 to 60Hz
Function
Range
Resolution
Accuracy ±
(% of reading + digits)
DC Voltage
600.0mV
0.1mV
±(1.0% + 8 digits)
6.000V
1mV
±(1.0% + 3 digits)
60.00V
10mV
600.0V
0.1V
1000V
1V
±(1.2% + 3 digits)
Input Protection:
1000V AC RMS or 1000V DC
Input Impedance:
10MΩ
Accuracy ±
(% of reading + digits)
Function
Range
Resolution
Low Z
600.0mV
0.1mV
DC Voltage
6.000V
1mV
±(3.0% + 40 digits)
60.00V
10mV
600.0V
0.1V
Input Protection:
600V AC RMS or 600V DC
Accuracy is stated at 65°F to 83°F (18°C to 28°C), less than 70% relative
humidity
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Function
Range
Resolution
Accuracy ±
(% of reading + digits)
Frequency
9.999Hz
0.001Hz
99.99Hz
0.01Hz
±(1.0% +5 digits)
999.9Hz
0.1Hz
9.999kHz
1Hz
Input Protection:
600V AC RMS or 600V DC
Sensitivity:
>8V RMS
Function
Range
Resolution
Accuracy ±
(% of reading + digits)
Duty Cycle
20.0% to 80.0%
0.1%
±(1.2% +2 digits)
Input Protection:
600V AC RMS or 600V DC
Pulse Width:
0.1 to 100mS
Frequency Range:
5Hz to 10kHz
Sensitivity:
>8V RMS
Function
Range
Resolution
Accuracy ±
(% of reading + digits)
AC Current
600.0µA
0.1µA
6000µA
1µA
±(1.5% +3 digits)
60.00mA
10µA
600.0mA
0.1mA
10.00A
10mA
±(2.0% +8 digits)
All AC current ranges are specified from 5% of range to 100% of range
Overload Protection:
µA, mA ranges: 800mA/1000V Fuse
10A range: 10A/1000V Fuse
AC current bandwidth:
50 to 60Hz
Function
Range
Resolution
Accuracy ±
(% of reading + digits)
DC Current
600.0µA
0.1µA
6000µA
1µA
±(1.0% +3 digits)
60.00mA
10µA
600.0mA
0.1mA
10.00A
10mA
±(1.5% +8 digits)
Overload Protection:
µA, mA ranges: 800mA/1000V Fuse
10A range: 10A/1000V Fuse
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Function
Range
Resolution
Accuracy ±
(% of reading + digits)
Resistance
600.0Ω
0.1Ω
6.000kΩ
1Ω
±(1.5% +5 digits)
60.00kΩ
10Ω
600.0kΩ
100Ω
6.000MΩ
1kΩ
±(2.0% +10 digits)
60.00MΩ
10kΩ
Input Protection:
600V AC RMS or 600V DC
Function
Range
Resolution
Accuracy ±
(% of reading + digits)
Capacitance
60.00nF
10pF
±(5.0% +35 digits)*
600.0nF
100pF
6.000µF
0.001µF
±(3.0% +5 digits)
60.00µF
0.01µF
600.0µF
0.1µF
6000µF
1µF
±(5.0% +5 digits)
Input Protection:
600V AC RMS or 600V DC
*Accuracy is not stated below 6nF
Function
Range
Resolution
Accuracy ±
(% of reading + digits)
Temperature
-4°F to 1400°F
0.1°F
±(2.0% +9ºF)
-20°C to 760°C
0.1°C
±(2.0% +5ºC)
Input Protection:
600V AC RMS or 600V DC
Maintenance
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Warranty Information
Triplett / Jewell Instruments extends the following warranty to the
original purchaser of these goods for use. Triplett warrants to the
original purchaser for use that the products sold by it will be free
from defects in workmanship and material for a period of (3) three
years from the date of purchase. This warranty does not apply to any
of our products which have been repaired or altered by unauthorized
persons in any way or purchased from unauthorized distributors so
as, in our sole judgment, to injure their stability or reliability, or which
have been subject to misuse, abuse, misapplication, negligence,
accident or which have had the serial numbers altered, defaced, or
removed. Accessories, including batteries are not covered by this
warranty
Copyright © 2019 Triplett
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