Triplett Test Equipment & Tools MM300-NIST, MM300 User manual

User Manual

MM300
True RMS Manual Ranging Digital Multimeter

Introduction

Congratulations on your purchase of the Triplett MM300 True RMS Manual Ranging Digital
Multimeter This instrument performs AC/DC voltage, AC/DC Current, Resistance, Audible Continuity,
Diode, Temperature measurements and Frequency measurements, it is a 3 3/4 digits, 3999 counts

Safety

• Circuits under test must be de-energized and isolated before connections are made (except for

International Safety Symbols

voltage measurements).

• Circuit connections must not be touched during a test. Use extreme caution when working near
bare conductors and bus bars. Accidental contact with conductors could result in electrical
shock.

• Use caution when working near voltages above 60VDC or 30VACrms.

• After insulation tests, capacitors must be discharged.

• Test leads (including alligator clips) must be in good working order, clean and without broken

or cracked insulation.

• When servicing, use only specified replacement parts.

Caution, refer to this manual before using this meter

Find Quality Products Online at: [e-mail]

Dangerous Voltages

Meter is protected throughout by double or reinforced insulation

www.GlobalTestSupply.com

DC (Direct Current).

AC (Alternating Current).

DC or AC

Important safety information.
Refer to the manual.

Dangerous voltage maybe present.

Earth ground.

Low battery

Fuse.

Diode

Continuity test

°C

Centigrade

°F

Fahrenheit

AUTO

Auto range

Conforms to European Union directive.

Double insulated.

APO

APO auto power off

Battery capacity

▲

Relative test

Data hold

ELECTRICAL SYMBOLS

Meter Description

1) Protective Holster

2) LCD Display

3) “Select.” Button
When you measure the current, pressing this button will
switch the meter between DC function and AC function.
When you measure the diode or the continuity, pressing
this button will switch the meter between the diode and
the continuity functions.

4) “ ” Button
After pressing the button, the present reading is held on

the display, meanwhile “ ” is displayed on the LCD

as an indicator. To exit the Hold Mode, press the button
again and the indicator “ ” will disappear.

Press the button for 2 seconds to turn the Backlight ON.
Press again for 2 seconds to turn OFF.

5) Function/Range Rotary Switch
This switch can be used to select desired function and
range.

6) “A” Jack
Plug-in connector for the red test lead for Current
(200mA ~ 10A) measurements.

7) “COM” Jack
Plug-in connector for black (negative) test lead.

8) “INPUT” Jack

Plug-in connector for the red test lead for all measurements except current (≥200mA) measurements

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Operation

DC & AC VOLTAGE MEASUREMENT

1. Connect red test lead to “INPUT” jack, Black lead to “COM” jack.

2. Set RANGE switch to desired VOLTAGE range, if the voltage to be measured
is not known beforehand, set switch to the highest range and reduce it until
satisfactory reading is obtained.

3. Connect test leads to device or circuit being measured.

4. Turn on power of the device or circuit being measured voltage value will
appear on Digital Display along with the voltage polarity.

DC/AC CURRENT MEASUREMENT

1. Red lead to “INPUT”. Black lead to “COM” (for measurements between 200mA
and 10A connect red lead to “10A” jack with fully depressed.)

2. Range switch to desired range. The default function of the meter is the
measurement of DCA.

3. Press “select” button to switch to ACA measurement mode.

4. Open the circuit to be measured, and connect test leads in series with the load
in with current is to measure.

5. Read current value on Digital Display.

6. Additionally, “A” function is designed for intermittent use only. Maximum
contact time of the test leads with the circuit is 15 seconds, with a minimum
intermission time of seconds between tests.

RESISTANCE MEASUREMENT

1. Red lead to “INPUT”. Black lead to “COM”.

2. Range switch to desired Ω range.

3. If the resistance being measured is connected to a circuit, turn off power and
discharge all capacitors before measurement.

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

4. Connect test leads to circuit being measured.

5. Read resistance value on Digital Display.

DIODE MEASUREMENT

1. Red lead to “INPUT”, Black lead to “COM”.

2. RANGE switch to “ ” range.

3. Connect the red test lead to the anode of the diode to be measured and black
test lead to cathode.

4. The forward voltage drop in mV will be displayed. If the diode is reversed,
figure “OL” will be shown.

TEMPERATURE MEASUREMENT

1. Range switch to ºC or ºF range, it will display room temperature in ºC or ºF
value.

2. Connect the K-type thermoelectric couple to “INPUT” and “COM” jacks.

3. The display will read Temperature value ºC or ºF.

4. Press “select” button, can switch the unit of measurement of temperature. The
default is temperature measurement in Celsius.

NOTE: The K-type thermocouple Max. Operating temperature of Probe:
250˚C/482˚F (300˚C/572˚F short-term). The sensor supplied with the instrument
is an ultra- fast response naked bead thermocouple suitable for many general
purpose applications.

AUDIBLE CONTINUITY TEST

1. Red lead to “INPUT”, Black lead to “COM”.

2. RANGE switch to “ ” range.

3. Connect test leads to two points of circuit to be tested. If the resistance is lower
than 30Ω±20Ω, the buzzer will sound.

BATTERY TEST

1. Connect the black test lead to the "COM" jack and the red test lead to the
"INPUT" jack (Note: The polarity of the red test lead is positive "+").

2. According to the different type of the battery (1.5V, 9V,) to be tested, set the
range switch to the desired BATT range.

3. Connect the test leads to the battery to be tested.

4. Read the reading on the display. The polarity of the red test lead connection
will be indicated.

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

RANGE

RESOLUTION

ACCURACY

2V

1mV

±（0.8%of rdg+5D）

20V

10mV

200V

100mV

600V

1V

±（1.0% of rdg+5D）

RANGE

RESOLUTION

ACCURACY

200V

100mV

±（1.0% of rdg+5D）
600V

1V

“ ” FUNCTION

5. After pressing the button, the present reading is held on the display, meanwhile

“ ” is displayed on the LCD as an indicator. To exit the Hold Mode, press
the button again and the indicator “ ” will disappear.

6. Pressing the button more than 2 seconds will turn the Backlight ON and
OFF.

Auto Power Off

If you don’t operate the meter for about 15 minutes, it will range switch or

press a button.
In the power off state, press and “Select” button to Rotary range switch, you
can cancel the auto power off function, “APO” symbol disappear from the
LCD.

Specifications

Accuracies are guaranteed for 1 year, 23ºC±5ºC, less than 80%RH

DC VOLTAGE

OVERLOAD PROTECTION: 220V rms AC for 200mV range and 600V DC or

600V rms for all ranges.

AC VOLTAGE

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

RESPONSE: Average responding, calibrated in rms of a sine wave.

RANGE

RESOLUTION

ACCURACY

200mA

100µA

±（1.5% of rdg+4D）

10A

10mA

±（2.0% of

rdg+10D）

Range

Resolution

Accuracy

200mA

100µA

±(1.5% of rdg + 4D)

10A

10mA

±(2.0% of rdg + 4D)

RANGE DESCRIPTION

Built-in buzzer sounds if resistance is

less then 30±20Ω

FREQUENCY RANGE: 45Hz ~ 450Hz
OVERLOAD PROTECTION: 600V DC or 600V rms for all ranges.

AUDIBLE CONTINUITY

OVERLOAD PROTECTION: 15 second maxi- mum 220 V rms.

DC CURRENT

OVERLOAD PROTECTION: 500mA/600V fuse or 10A/600V fuse
MEASURING VOLTAGE DROP: 200mV

AC CURRENT

Overload Protection:
µA and mA ranges: F0.5A/600V fuse
10A ranges: F10A/600V fuse
Max. Input Current:
“INPUT” jack: 200mA
“A” jack: 10A
(For measurements>5A: duration <10 seconds, interval >15 minutes)
Voltage Drop: 200mA 10A ranges: 200mV
Frequency Range: 40Hz ~ 400Hz
Response: Average, calibrated in rms of sine wave

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

RESISTANCE

RANGE

RESOLUTION

ACCURACY

200Ω

0.1Ω

±（1.0% of rdg+10D）

2KΩ

1Ω

20KΩ

10Ω

200KΩ

100Ω

2MΩ

1KΩ

RANGE

RESOLUTION

ACCURACY

-40℃~150℃

1℃

±

（1.0%+4D）

150℃~1370℃

±

（1.5%+15D

）

-40℃~302℃

1℃

±

（1.0%+4D）

302℃~1999℃

±

（1.5%+15D

）

Range

Resol.

Internal Resistance

9V

10mV

910Ω

1.5V

1mV

150Ω

OVERLOAD PROTECTION: 15 seconds maxi- mum 220Vrms.

TEMPERATURE (with K-TYPE PROBE)

BATTERY TEST

BATTERY AND FUSE REPLACEMENT

Fuse rarely need replacement and blow almost always as a result of operator
error.
If “ ” appears in display, it indicates that the battery should be replaced.
To replace battery & Fuse (500mA/600V or 10A/600V) remove the 1 screws in
the bottom of the battery case, simply remove the old, and replace with a new
one. Be careful to observe polarity .Remove the hostel and remove the bottom
cover of the meter to replace the fuse. Please replace the appropriate fuse
according to operation manual.

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

ACCESSORIES

 Operator’s instruction manual
 Set of test leads
 Gift box
 K-type thermoelectric couple
 1.5V 3, AAA s

General specifications

Display : LCD, 1999 counts updates 2/sec
LCD Size : 55 x 31mm
Polarity Indication : “-” displayed automatically
Over-range Indication : “OL” displayed
Low Battery Indication : “ ” displayed
Range select : auto or manual
Operation Temperature : 0°C to 40°C, less than 80%RH
Storage Temperature : -10°C to 50°C, less than 85%RH
Battery Type : 1.5V x 3, AAA size
Dimension (H×W×D) : 145×70×35mm
Weight : Approx 157g

Approvals

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 (1) one year 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

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com