INSTRUCTION MANUAL
ENGLISH
MM400
• DATA HOLD
• AUDIBLE
CONTINUITY
• MIN / MAX
• TEMPERATURE
• DIODE TEST
• CAPACITANCE
FRANÇAIS pg. 37
ESPAÑOL pg. 19
Auto-Ranging
Ω
2
GENERAL SPECIFICATIONS
Klein Tools MM400 is an auto-ranging multimeter that measures AC/DC
voltage, AC/DC current, and resistance. It can also measure temperature,
capacitance, frequency, duty-cycle, and test diodes and continuity.
• Operating Altitude: 6562 ft. (2000m)
• Relative Humidity: <80% non-condensing
• Operating Temp: 32°F to 104°F (0°C to 40°C)
• Storage Temp: 14°F to 140°F (-10°C to 60°C)
• Accuracy: Values stated at 65°F to 83°F (18°C to 28°C)
• Temp Coef cient: 0.1 x (Quoted Accuracy) per °C above
28°C or below 18°C, corrections are required when ambient
working temp is outside of Accuracy Temp range
• Dimensions: 6.04" x 3.07" x 1.78" (153.4 x 78.0 x 45.2 mm)
• Weight: 8.1 oz. (230 g)
• Calibration: Accurate for one year
• Standards: Conforms to: UL STD 61010-1, 61010-2-030,
61010-2-033.
Certified to: CSA STD C22.2 # 61010-1,
61010-2-030, 61010-2-033.
IEC EN 61010-1, 61010-2-030,
61010-2-033, 61326-1.
• Pollution degree: 2
• Accuracy: ± (% of reading + # of least significant digits)
• Drop Protection: 3.3 ft. (1m)
• Safety Rating: CAT III 600V, Class 2, Double insulation
CAT III: Measurement category III is applicable to test and
measuring circuits connected to the distribution part of the
building’s low-voltage MAINS installation.
• Electromagnetic Environment: IEC EN 61326-1. This
equipment meets requirements for use in basic and controlled
electromagnetic environments like residential properties,
business premises, and light-industrial locations.
Specifications subject to change.
ENGLISH
3
ELECTRICAL SPECIFICATIONS
VOLTAGE (AUTO-RANGING)
Function Range Resolution Accuracy
AC Voltage
(V AC)
4.000V 1mV ±(1.2% + 5 digits)
40.00V 10mV
±(1.5% + 5 digits)
400.0V 100mV
600V 1V ±(2.0% + 5 digits)
DC Voltage
(V DC)
400.0mV 0.1mV ±(1.0% + 8 digits)
4.000V 1mV
±(1.2% + 3 digits)40.00V 10mV
400.0V 100mV
600V 1V ±(1.5% + 3 digits)
Input Impedance: 10MΩ
Frequency Range: 50 to 60Hz
Maximum Input: 600V AC RMS or 600V DC
CURRENT (AUTO-RANGING)
AC Current
(μA and mA)
400.0μA 0.1μA ±(1.5% + 5 digits)
4000μA 1μA
±(1.8% + 5 digits)40.00mA 10μA
400.0mA 100μA
10A 10mA ±(3.0% + 7 digits)
DC Current
(μA and mA)
400.0μA 0.1μA ±(1.0% + 5 digits)
4000μA 1μA
±(1.5% + 5 digits)40.00mA 10μA
400.0mA 100μA
10A 10mA ±(3.0% + 7 digits)
Overload Protection: 500mA / 600V and 10A / 600V Fuses
Frequency Range: 50 to 60Hz
Maximum Input: µA/mA setting: 500mA AC RMS / DC
10A setting: 10A AC RMS / DC
RESISTANCE (AUTO-RANGING)
Range Resolution Accuracy
400.0Ω 0.1Ω
±(1.5% + 5 digits)
4.000kΩ 1Ω
40.00kΩ 10Ω
400.0kΩ 100Ω
4.000MΩ 1kΩ
±(2.0% + 10 digits)
40.00MΩ 10kΩ
Maximum Input: 600V DC or 600V AC RMS
4
ELECTRICAL SPECIFICATIONS
CAPACITANCE (AUTO-RANGING)
Range Resolution Accuracy
40.00nF 10pF ±(5.0% + 35 digits)
400.0nF 0.1nF
±(3.0% + 5 digits)4.000μF 1nF
40.00μF 10nF
200.0μF 0.1μF ±(5.0% + 5 digits)
Maximum Input: 600V DC or 600V AC RMS
FREQUENCY (AUTO-RANGING)
9.999Hz 0.001Hz
±(1.5% + 5 digits)
99.99Hz 0.01Hz
999.9Hz 0.1Hz
±(1.3% + 5 digits)9.999kHz 1Hz
50.00kHz 10Hz
Sensitivity: >8V RMS
Maximum Input: 600V DC or 600V AC RMS
DUTY CYCLE
0.1% to 99.9%
0.1% ±(1.2% + 2 digits)
Pulse width: >100us, <100ms
Frequency width: 5Hz to 10kHz
Sensitivity: >8V RMS
Maximum Input: 600V DC or 600V AC RMS
TEMPERATURE
0° to 1000°F 0.1°F / 1.0°F ±(3.0% + 9°F)
-18° to 538°C 0.1°C / 1.0°C ±(3.0% + 5°C)
ENGLISH
5
ELECTRICAL SPECIFICATIONS
• Diode Test: 1.5 mA max, open circuit voltage 3.0V DC
• Continuity Check: Audible signal <50Ω
• Sampling Frequency: 3 samples per second
• Overload: "OL" indicated on display, overload protection
600V RMS in all settings
• Polarity: "-" on display indicates negative polarity
• Display: 3 ¾ digit, 4000 Count LCD
WARNINGS
To ensure safe operation and service of the meter, follow these
instructions. Failure to observe these warnings can result in
severe injury or death.
• Before each use verify meter operation by measuring a known
voltage or current.
• Never use the meter on a circuit with voltages that exceed the
category based rating of this meter.
• Do not use the meter during electrical storms or in wet weather.
• Do not use the meter or test leads if they appear to be damaged.
• Use only with CAT III or CAT IV rated test leads.
• Ensure meter leads are fully seated, and keep fingers away
from the metal probe contacts when making measurements.
• Do not open the meter to replace batteries while the probes
are connected.
• Use caution when working with voltages above 25V AC RMS
or 60V DC. Such voltages pose a shock hazard.
• To avoid false readings that can lead to electrical shock,
replace batteries when a low battery indicator appears.
• Do not attempt to measure resistance or continuity on a live
circuit.
• Always adhere to local and national safety codes. Use personal
protective equipment to prevent shock and arc blast injury
where hazardous live conductors are exposed.
6
SYMBOLS ON METER
AC/DC Voltage or Current Resistance (in Ohms)
Audible Continuity Diode
Capacitance
Hz
Frequency
%
Duty-cycle Double Insulated Class II
°F/°
C
Temperature (Fahrenheit / Celsius) Ground
Fuse (with rating below symbol)
Warning or Caution
To ensure safe operation and service of this meter, follow all warnings
and instructions detailed in this manual.
Risk of Electrical Shock
Improper use of this meter can lead to risk of electrical shock. Follow
all warnings and instructions detailed in this manual.
SYMBOLS ON LCD
H
Data Hold Audible Continuity
Diode Auto Ranging
AC (Alternating Current) DC (Direct Current)
Low Battery Auto Power Off
MAX
Maximum Value
MIN
Minimum Value
°F
Degrees Fahrenheit
°C
Degrees Celsius
M
Mega (value x 106)
k
kilo (value x 103)
m
mili (value x 10-3)
μ
micro (value x 10-6)
n
nano (value x 10-9)
V
Volts
A
Amps
F
Farads
Ohms
Hz
Hertz (Frequency)
%
Duty-Cycle
ENGLISH
7
FEATURE DETAILS
1
7
10
9
6 8
2
3 5
4
1.
4000 count LCD display
6.
Backlight ON/OFF button
2.
Function selector switch
7.
"RANGE" button
3.
"10A" jack
8.
"MAX/MIN" button
4.
"COM" jack
9.
"HOLD" (Data Hold) button
5.
"VΩ" jack
10.
"SEL" (Select) button
NOTE: There are no user-serviceable parts inside meter.
8
FUNCTION BUTTONS
ON/OFF
To Power ON the meter rotate the Function Selector switch 2 from the
OFF setting to any measurement setting. To Power OFF the meter rotate
the Function Selector switch
2
to the OFF setting. By default, the meter
will automatically Power OFF after 30 minutes of inactivity. Reactivate
meter by pressing any button. To deactivate the automatic Power OFF
feature, power the meter ON with the SEL button
11
depressed. When
automatic Power OFF is deactivated, the
symbol will not be visible in
the display.
"SEL" (SELECT) BUTTON (FOR SECONDARY FUNCTIONS)
The "SEL" button 10 activates the secondary function for each
application accessible by the function selector switch
2
. For current
and voltage, it toggles between AC and DC. For the other functions, it
switches between °F and °C, between Hz and % Duty-cycle, between
Continuity and Resistance, and between Capacitance and Diode-test.
The default function for each application is printed on the meter in
white; the secondary function for each location is printed on the meter
in orange.
"HOLD" (DATA HOLD) BUTTON
Press the "HOLD" button 9 to hold the measurement on the display.
Press again to release the display and return to live measuring.
"RANGE" BUTTON
The meter defaults to auto-ranging measurement mode . This
automatically determines the most appropriate measurement range
for the testing that is being conducted. To manually force the meter to
measure in a different range, use the "RANGE" button
7
.
1. Press the "RANGE" button
7
to manually select measurement range
(
is deactivated on the LCD). Repeatedly press the "RANGE"
button
7
to cycle through the available ranges, stopping once the
desired range is reached.
2. To return to auto-ranging mode, press and hold the "RANGE" button
7
for more than one second ( is reactivated).
"MAX/MIN" BUTTON
When the "MAX/MIN" button 8 is pressed, the meter keeps track of
the minimum and maximum value of the measurement as the meter
continues to take samples. The first press of the "MAX/MIN" button
8
displays the Max value, the second press displays the Min value.
To return to normal measuring mode, press and hold the "MAX/MIN"
button
8
for more than one second.
BACKLIGHT BUTTON
Press and hold the backlight button 6 for more than one second
to turn the backlight on or off. Backlight automatically turns off after
approximately 3 minutes.
ENGLISH
9
OPERATING INSTRUCTIONS
CONNECTING TEST LEADS
Do not test if leads are improperly seated. Results could cause
intermittent display readings. To ensure proper connection, firmly
press leads into the input jack completely.
TESTING IN CAT III / CAT IV MEASUREMENT LOCATIONS
Ensure the test lead shield is pressed firmly in place. Failure to use
the CAT III / CAT IV shield increases arc-flash risk.
TESTING IN CAT II MEASUREMENT LOCATIONS
CAT III / CAT IV shields may be removed for CAT II locations. This
will allow testing on recessed conductors such as standard wall
outlets. Take care not to lose the shields.
5/32"
(4 mm)
.7" (18 mm)
INCORRECT
CORRECT
10
ENGLISH
OPERATING INSTRUCTIONS
AC/DC VOLTAGE (LESS THAN 600V)
1. Insert RED test lead into VΩ jack
5
, and BLACK test lead into
COM jack
4
, and rotate function selector switch 2 the V
setting.
NOTE: The meter defaults to AC measurement. Press the "SEL"
button
10
to toggle between AC and DC modes. The AC or DC
icon on the LCD indicates which mode is selected.
2. Apply test leads to the circuit to be tested to measure voltage.
The meter will auto-range to display the measurement in the
most appropriate range.
NOTE: If "–" appears on the LCD, the test leads are being applied
to the circuit in reverse polarity. Swap the position of the leads to
correct this.
NOTE: When in a voltage setting and the test leads are open,
readings of order mV may appear on the display. This is noise and
is normal. By touching the test leads together to close the circuit
the meter will measure zero volts.
Red leadBlack lead
11
OPERATING INSTRUCTIONS
AC/DC CURRENT
NOTE: The meter defaults to AC measurement. Press the "SEL"
button
10
to toggle between AC and DC modes. The AC or DC icon
on the LCD indicates which mode is selected.
1. Attach test leads to the appropriate jacks and rotate function
selector switch
2
to the appropriate setting as follows:
• For AC/DC currents >400mA and <10A: Insert RED test lead into
10A jack
3
, and BLACK test lead into COM jack 4, and rotate
function selector switch
2
to the 10A AC/DC setting.
• For mA AC/DC currents <400mA: Insert RED test lead into
VΩ jack
5
, and BLACK test lead into COM jack 4, and rotate
function selector switch
2
to the mA AC/DC setting.
• For µA DC currents <400µA: Insert RED test lead into
VΩ jack
5
, and BLACK test lead into COM jack 4, and rotate
function selector switch
2
to the µA AC/DC setting.
Red lead Black lead
Red lead
Black lead
Red lead
Black lead
12
ENGLISH
2. To measure current: Remove power from circuit, open circuit at
measurement point, connect meter in-series in the circuit using
the test leads, and apply power to circuit.
3. Measure the current. The meter will auto-range to display the
measurement in the most appropriate range.
Do not attempt to measure more than 10A.
When measuring currents greater than 6A, a measurement
time of 30 seconds followed by 10 minutes of recovery time
is recommended.
RESISTANCE MEASUREMENTS
1. Insert RED test lead into VΩ jack
5
, and BLACK test lead
into COM jack
4
,
and rotate function selector switch 2 to the
Continuity/Resistance
setting.
NOTE: The meter defaults to Continuity testing in this mode. To
enter Resistance testing mode, press the "SEL" button
10
once.
The Resistance icon
will appear on the display.
2. Remove power from circuit.
3. Measure resistance by connecting test leads to circuit. The
meter will auto-range to display the measurement in the most
appropriate range.
NOTE: When in a Resistance setting and the test leads are open
(not connected across a resistor), or when a failed resistor is under
test, the display will indicate O.L. This is normal.
DO NOT attempt to measure resistance on a live circuit.
OPERATING INSTRUCTIONS
Red lead
Black lead
13
OPERATING INSTRUCTIONS
CONTINUITY
1. Insert RED test lead into VΩ jack
5
, and BLACK test lead into
COM jack
4
, and rotate function selector switch 2 to the
Continuity/Resistance
setting.
NOTE: The meter defaults to Continuity testing in this mode. Ensure
that the Continuity Testing icon
is visible on the display. If not,
press the "SEL" button
10
once.
2. Remove power from circuit.
3. Test for continuity by connecting conductor or circuit with test
leads. If resistance is measured less than 50Ω, an audible signal
will sound and display will show a resistance value indicating
continuity. If circuit is open, display will show "OL".
DO NOT attempt to measure continuity on a live circuit.
Red lead
Black lead
14
ENGLISH
OPERATING INSTRUCTIONS
CAPACITANCE
1. Insert RED test lead into VΩ jack
5
, and BLACK test lead into
COM jack
4
, and rotate function selector switch 2 to the
Capacitance/Diode
setting.
NOTE: The meter defaults to Capacitance testing in this mode.
Ensure that the display reads "0 nF" with test leads open. If not,
press the "SEL" button
10
once.
2. Remove power from circuit.
3. Measure capacitance by connecting test leads across the
capacitor. The meter will auto-range to display the measurement
in the most appropriate range.
DIODE TEST
1. Insert RED test lead into VΩ jack
5
, and BLACK test lead into
COM jack
4
, and rotate function selector switch 2 to the
Capacitance/Diode
setting.
NOTE: The meter defaults to Capacitance testing in this mode. To
enter Diode testing mode, press the "SEL" button
10
once. The
Diode icon
will appear on the display.
2. Touch test leads to diode. A reading of 200-700mV on display
indicates forward bias, "OL" indicates reverse bias. An open
device will show "OL" in both polarities. A shorted device will
show approximately 0mV.
Red lead
Black lead
Red lead
Black lead
15
Remove thermocouple before switching meter to other
measurement functions.
The thermocouple included with the original purchase is
suitable for temperatures below 356°F / 180°C only. To measure
higher temperatures, a K-type thermocouple with
the appropriate measurement range should be used.
OPERATING INSTRUCTIONS
FREQUENCY / DUTY-CYCLE
1. Insert RED test lead into VΩ jack 5 and BLACK test lead into
COM jack 4, and rotate function selector switch 2 to the
Frequency/Duty-Cycle setting.
NOTE: The meter defaults to Frequency testing in this mode. To enter
Duty-Cycle testing mode, press the "SEL" button
10
once. Ensure
that the appropriate icon (either Hz or %) appears on the display.
2. Measure by connecting test leads across the circuit.
TEMPERATURE
1. Insert K-type thermocouple into the VΩ 5 and COM 4 jacks, and
rotate function selector switch 2 to the Temperature setting.
NOTE: The meter defaults to Fahrenheit scale in this mode. To enter
Celsius scale, press the "SEL" button
10
once. Ensure that the
appropriate icon (either °F or °C) appears on the display. Default
temperature scale may be changed by powering on the meter with the
"HOLD" button 9 depressed.
2. To measure temperature, make contact between the thermocouple
tip and the object being measured. When thermocouple tip and
object are in thermal equilibrium, the measurement on the display
will stabilize. The meter will auto-range to display the measurement
in the most appropriate range.
RED
BLACK
K-Type Thermocouple
with Adapter
Thermocouple
Adapter
Red lead
Black lead
16
ENGLISH
MAINTENANCE
BATTERY REPLACEMENT
When
indicator is displayed on LCD, batteries must be replaced.
1. Remove screw from battery door.
2. Replace 2 x AAA batteries (note proper polarity).
3. Replace battery door and fasten securely with screw.
FUSE REPLACEMENT
A fuse may blow if more than 500mA is applied to the
VΩ
jack 5,
or more than 10A is applied to the 10A jack
3
. To access fuses:
1. Remove 6 screws from back of meter and remove back housing.
2. Replace blown fuse(s) with:
VΩ (
μA/mA) jack 5:
500mA/600V fast-blow (Klein Cat. No. 69033)
10A jack 3: 10A/600V fast-blow (Klein Cat. No. 69032)
3. Replace back housing and fasten securely with screws.
T
o avoid risk
of electric shock,
disconnect leads from
any voltage source
before removing
battery door.
To avoid risk of
electric shock, do
not operate meter
while battery door
is removed.
To avoid risk of electric shock,
disconnect leads from any voltage
source before accessing fuses.
To avoid risk of electric shock,
do not operate meter while back
housing is removed.
500mA/600V
fast-blow fuse
(Klein Cat. No. 69033)
10A/600V
fast-blow fuse
(Klein Cat. No. 69032)
17
CLEANING
Be sure meter is turned off and wipe with a clean, dry lint-free
cloth.
Do not use abrasive cleaners or solvents.
STORAGE
Remove the batteries when meter is not in use for a prolonged
period of time. Do not expose to high temperatures or
humidity. After a period of storage in extreme conditions
exceeding the limits mentioned in the General Specifications
section, allow the meter to return to normal operating
conditions before using.
WARRANTY
www.kleintools.com/warranty
DISPOSAL / RECYCLE
Do not place equipment and its accessories in the trash.
Items must be properly disposed of in accordance with local
regulations. Please see www.epa.gov or www.erecycle.org
for additional information.
CUSTOMER SERVICE
KLEIN TOOLS, INC.
450 Bond Street
Lincolnshire, IL 60069
1-877-775-5346
customerservice@kleintools.com
www.kleintools.com
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