Triplett 8115 User Manual

Model 9055

TRIPLETT

6-in-1 EnviroMeter with Sound

Light, Temperature and Humidity

Instruction Manual

84-896

10/10

TABLE OF CONTENTS

TITLE

1. INTRODUCTION………………………………………2

2. SA F E TY I N F ORMATI ON ……………………… …4

3. FEATURES……………………………………………18

4. SPECIFICATIONS……………………………………19

5. CONTROL LOCATIONS AND DESCRIPTIONS…. 26

6. OPERATING INSTRUCTIONS …………………… 29

7. MAINTENANCE ………………………………………. 36

8. WARRANTY ……………………………………………38

1

1. INTRODUCTION

The Triplett 9055 6-in-1 Digital Multi-Tester is an autoranging

ruggedized 3-3/4 digit (4000 count) precision Digital

Multimeter with a large backlit high contrast LCD display and

expanded measurement capabilities. In addition to the

measurements performed by conventional multimeters, the

9055 also measures Sound Level, Light Level, Humidity, and

Temperature. A built-in Non-Contact Voltage Sensor detects

and indicates the presence of dangerous AC voltages.

The 9055’s offering of conventional multimeter measurement

features includes AC and DC Voltage and Current,

Resistance, Continuity, Diode Test, Capacitance, Frequency,

and Duty Cycle.

The overmolded housing provides impact and drop

resistance in a sleek ergonomic package, and the convenient

Auto Power Off feature maximizes battery life. Its industry

leading CAT IV design provides superior resistance to

damage from transient overvoltages such as those

experienced in demanding industrial settings.

2

The dBC Sound Level function is useful for measuring noise
in factories, schools, hospitals, offices, airports, homes,
etc….. and checking the acoustics of studios, auditoriums,
churches, home theater installations, etc.

The Light Level function measures illumination in Lux on two
ranges. Its silicon sensor is very stable and fully cosine
corrected for the angular incidence of light.

Temperature is measureable in the meter itself or at the tip of
the provided temperature probe.

Relative Humidity is measured and displayed continuously
along with the room temperature, providing a convenient
reference for all other measurements.

The 9055 is well suited for use in all test environments, from

occasional use in residential applications, to everyday use

by installers, home theater technicians, security technicians,

electricians, HVAC technicians, and other professionals in

the electrical and electronics industry.

3

2

SAFETY INSTRUCTIONS

．．．．

This meter has been designed with safety in mind, but like all
products of this type, must be operated carefully to obtain the
best performance and avoid injury.

NEVER apply voltage or current to the meter that exceeds

the following specified limits:

Input Protection Limits

Function Maximum Input

600V AC / DC rms CAT IV

Volts AC / DC

1000V DC CAT III

700V AC CAT III

mA AC / DC

A AC / DC

400mA / 660V AC / DC rms

10A / 600V for 30 seconds max

every 15 minutes
Frequency, Resistance,
Capacitance, Duty
Cycle, Diode Test,

600V AC / DC rms

Continuity, Temperature

This symbol on the product means to refer to this

manual for safety cautions or warnings.

This symbol on the product means that dangerous

voltages may be present. Use caution.

4

2.1 Read all instructions in this manual before using

this meter. Failure to do so may result in damage to

the meter or injury to the user.

2.2 Prior to using the meter in any situation which could

result in injury to the user, in order to verify that the

meter is functional and producing a valid reading,

test the meter on a circuit(s) known to have

potentials equivalent to the potential that is to be

measured. For example, before using the meter to

determine if an AC power line is energized with

120VAC, test the meter on a line known to be

energized with 120VAC. Failure to do so may result

in damage to the meter or injury to the user.

2.3 Do not use this meter with its case open, or with

parts removed. Doing so may damage the meter

and/or injure the user.

2.4 When using this meter in schools and workshops,

responsible teachers or skilled personnel must

control the usage of this meter. Failure to observe

this precaution may result in damage to the meter

or injury to the user.

5

2.5 Follow the recommendations of any Trade

Organizations or Regulatory Agencies whose

scope encompasses the use of this meter. Failure

to do so may result in damage to the meter or injury

to the user.

2.6 Do not open this meter for maintenance without first

disconnecting the test leads from all external

circuitry. Failure to observe this precaution may

result in damage to the meter or injury to the user.

2.7 Repairs and maintenance must only be carried out

by qualified service personnel or qualified

electricians / technicians who know the dangers of,

and the safety rules applicable to this type of

equipment. Failure to observe this precaution may

result in damage to the meter or injury to the user.

2.8 Always set the meter to the appropriate range or

mode before connecting it to the circuitry to be

tested. Failure to observe this precaution may result

in damage to the meter or injury to the user.

6

2.9 Check the condition of the test leads before making

a measurement. Do not use the test leads if there is

damaged insulation or exposed metal. Failure to

observe this precaution may result in damage to the

meter or injury to the user.

2.10 Make sure test leads are properly inserted and

seated in the meter's input jacks. A loose test lead

may cause the user to believe that no hazard exists,

when in fact, dangerous voltages or currents may

be present. Failure to observe this precaution may

result in damage to the meter or injury to the user.

2.11 Do not touch the tips of the test leads when making

a measurement. Do not touch live circuitry when

making a measurement. Failure to observe this

precaution may result in damage to the meter or

injury to the user.

2.12 Before using the meter, examine both the meter

and the test leads for damage. Do not use the

meter if damage (damaged insulation, exposed

metal, cracked case, burnt smell, etc.) is evident.

7

Failure to observe this precaution may result in

damage to the meter or injury to the user.

2.13 Insert the test leads in the jacks specified in the

instructions for performing particular tests.

Inserting the test leads in incorrect jacks can

damage the meter and/or injure the user.

2.14 Do not exceed the maximum voltage or current

limitations of the meter. Doing so may damage the

meter and/or injure the user.

2.15 Do not apply voltage or current to the input of the

meter when it is set to any of the Ohms ranges.

Doing so may damage the meter and/or injure the

user.

2.16 Do not apply voltage or current to the input of the

meter when it is set to the Diode Test

,

Continuity Beeper , Capacitance

C

modes. Doing so may damage the meter and/or

CAP

, or

F or

injure the user.

8

2.17 Do not attempt to measure a voltage source with

the test leads plugged into the meter's uAmA or 10A

jacks. Doing so may damage the meter and/or

injure the user.

2.18 Do not rotate the Function switch with the test leads

connected to the circuitry to be tested. Doing so

may damage the meter or the circuitry, and/or injure

the user.

2.19 Replace fuses only with exact or equivalent fuses.

Do not "bridge" fuses out of circuit. Failure to

observe this precaution may result in damage to the

meter or injury to the user.

2.20 Do not apply voltages to the input of the meter

which are elevated above the earth ground

potential by more than 600V CAT IV AC/DC or

1000V CAT III AC/DC. Doing so may damage the

meter and/or injure the user.

2.21 Do not continue to use meter when the "low battery"

symbol

is displayed. The displayed reading

may be in error and lead the user to believe that no

9

hazard exists, when in fact, dangerous voltages or

currents may be present. Failure to observe this

precaution may result in damage to the meter or

injury to the user.

2.22 Use caution when working with voltages above 25

volts AC or 35 volts DC. Such voltages may cause a

life threatening electrical shock.

2.23 This meter is not for use by children. Failure to

observe this precaution may result in damage to the

meter or injury to the user.

2.24 Do not use this meter to make measurements in

adverse environments such as rain, snow, fog, or

locations with steam, explosive gases or dusts.

Doing so may damage the meter and/or injure the

user.

2.25 Do not use meter in condensing atmospheres. That

is, do not use meter in conditions where ambient

temperature and humidity could cause

condensation of water inside of meter. Doing so

may cause injury to the user.

10

2.26 Do not use the meter if either the meter or the test

leads are wet, either from exposure to the weather,

or after cleaning the case of the meter. Doing so

may cause injury to the user.

2.27 Do not attempt immediate use of the meter when

bringing it from a cold environment to a warm

environment. Condensation of water, inside and

outside of the meter, may produce dangerous

measuring conditions. Allow the meter to warm to

room temperature before using. Failure to observe

this precaution may result in damage to the meter

or injury to the user.

2.28 Do not modify the meter. Changing the design may

make the meter unsafe and may result in injury to

the user.

2.29 Use caution when attempting to evaluate if a

dangerous voltage is present. The meter will not

read AC voltage if it is set to DC, nor will it read DC

it is set to AC. For example, if the meter is set to

VDC, it will not measure a dangerous AC voltage,

even if the probes are inserted into a household AC

wall outlet.

11

2.30 Do not touch the metallic portion of one test lead if

the other test lead is connected to a live circuit. The

current from the live circuit may pass through the

meter and appear on the unconnected test lead.

Failure to observe this warning may result in user

injury.

2.31 Do not attempt to use meter when no display is

present on LCD. Doing so may damage the meter

and/or injure the user.

2.32 Use caution when measuring circuits containing

capacitors. Capacitors can store dangerous or

lethal levels of electricity, even when the circuitry

which they are in has been disconnected from its

power source. Some capacitors could source

enough energy to damage the meter and/or injure

the user.

2.33 Do not use the meter if there is evidence of

chemical leakage from the battery. Leakage could

damage meter and lead to injury of user.

12

2.34 Do not use this meter to measure current in circuits

whose open circuit voltage exceeds 600V AC/DC.

The meter's fuses are rated at 600V max. Failure to

observe this precaution may result in damage to the

meter or injury to the user.

2.35 When you use the meter to check a high-voltage

circuit, do not try to connect both test leads at once.

Instead, clip one probe to the neutral or ground lead

of the circuit (usually a bare, green, or white wire in

AC wiring circuits) using the insulated slip-on

Alligator Clips. Then probe for voltages with the

other test lead. This helps prevent you from

accidentally touching a hot wire, since you need to

concentrate on only one test lead. Failure to

observe this precaution may result in damage to the

meter or injury to the user.

2.36 If there is any doubt about the condition of the

meter (i.e. safe vs unsafe), remove the meter from

service and secure it in a location that will prevent

its unintentional use. Failure to observe this

precaution may result in damage to the meter or

injury to the user.

13

2.37 Do not use the meter if it does not appear to work

correctly on all ranges and in all modes. Failure to

observe this precaution may result in damage to the

meter or injury to the user.

2.38 Do not use the meter if it has undergone long-term

storage under unfavorable conditions. Failure to

observe this precaution may result in damage to the

meter or injury to the user.

2.39 Do not use the meter if it may have been damaged

in transport. Failure to observe this precaution may

result in damage to the meter or injury to the user.

2.40 Always connect one of the meter’s alligator clips to

the low side of a power circuit first. Never clamp

onto a hot wire first, (usually red, black, or blue in

AC wiring circuits.) If you clamp onto a hot wire

first, and touch the other probe, you could receive a

shock. Failure to observe this precaution may result

in damage to the meter or injury to the user.

14

2.41 To avoid damage to the meter and possible user

injury, disconnect test leads from test points before

changing the function/range. Failure to observe this

precaution may result in damage to the meter or

injury to the user.

2.42 Avoid usage near strong magnetic fields (magnets,

loudspeakers, transformers, motors, coils, relays,

contactors, electromagnets, etc.). The meter may

display readings that are in error, causing the user

to misinterpret the hazards present. For example,

the meter may indicate a low voltage when high

voltages are actually present. Failure to observe

this precaution may result in damage to the meter

or injury to the user.

2.43 Avoid usage near strong electrostatic fields (high

voltage power lines, televisions, computer monitors,

etc.). The meter may display readings that are in

error, causing the user to misinterpret the hazards

present. For example, the meter may indicate a low

voltage when high voltages are actually present.

Failure to observe this precaution may result in

damage to the meter or injury to the user.

15

2.44 Avoid usage near strong RF fields (radio or

television transmitters, walkie talkies, cellular

phones, etc.). The meter may display readings that

are in error, causing the user to misinterpret the

hazards present. For example, the meter may

indicate a low voltage when high voltages are

actually present. Failure to observe this precaution

may result in damage to the meter or injury to the

user.

2.45 Remove the battery when the meter may be left

unused for longer than 1 month. Chemical

leakage from the battery could damage the meter,

leading to user injury.

2.46 Do not attempt to test charged capacitors. Only

discharged capacitors may be tested. If you wish to

test a capacitor, discharge it using an approved

method before connecting it to the meter. Caution:

Some capacitors can store dangerous lethal

charges. Discharging these capacitors can be

dangerous unless an approved method is used.

Failure to observe this precaution may result in

damage to the meter or injury to the user.

16

2.47 The Non-Contact AC Voltage Detector in the 9055

may not detect the presence of AC voltage in all

situations. In particular, a twisted 3 phase cable

tends to cancel out its electrostatic field, which can

make the cable appear to be "dead". Use caution

and good work practices at all times, even when the

9055 indicates that AC voltage is not present.

Failure to observe this precaution may result in user

injury.

17

3

．．．．

FEATURES

• Deluxe Autoranging DMM with Enviro Measurement

• Built-in Light Level Meter (Lux)

• Built-in Sound Level Meter (dBC)

• Built-in Ambient Temperature Meter (°F and °C)

• Built-in Humidity Meter (%RH)

• Continuous Enviro Display (Temperature and Humidity)

• Built-in Non-Contact AC Voltage Sensor

• Temperature Measurement with Included Probe

(°F and °C)

• Large High Contrast Backlit LCD Display (fully

annunciated)

• 3-3/4 Digit Resolution (4000 Counts)

• CAT IV 600V Performance

• Voltage Ranges: 700V AC, 1000V DC

• AC/DC Current Ranges to 10A

• Resistance Ranges from 400 Ohms to 40M Ohms

• Capacitance Ranges from 50nF to 100uF

• Frequency Ranges from 5Hz to 10MHz

• Diode Test

• Continuity Beeper

• Hold ‘Freezes’ Reading

• REL ‘Zeros’ Reading

18

• Auto or Manual Ranging

• Auto Power Off

• Rugged Overmolded Case Design

• Built-in Stand and Test Lead Holders

• Fused uA, mA, and A Ranges

• Overload Protected

• Double Insulated

• CE Rated (EMC / LVD)

• CAT I, II, III, and IV Compliance

• 3 Year Warranty

• Includes: Safety Test Leads, Thermocouple Probe,

and 9V Battery

4. SPECIFICATIONS
Display: LCD with White Backlight, 3-3/4 digits (4000 count),

Fully annunciated.

Polarity: Automatic, (-) negative polarity indication.
Over Range: “OL” displays for Over Range.
Low battery indication: ‘ ‘ is displayed when the

battery is low.

Measurement rate: 3 times per second, nominal.
Operating environment: : 32°F~104°F at less than

70 % relative humidity. Short term exposure to higher
humidity permitted to measure Relative Humidity.

19

Storage temperature: 14 °F to 140 °F at less than

80 % relative humidity.

Battery: Standard 9V, NEDA1604 or 6F22 battery.
Dimensions: 6-5/8” x 3” x 1-7/8”
Weight: Approx: 11.2 oz (including battery)

The following accuracies are valid for 65 °F to 83 °F,
less than 70 % RH

Sound Level

Range Resolution Accuracy

35 to 100dB 0.1dB

± 5 dB at 94 dB sound

level, 1kHZ sine wave

Typical instrument frequency range: 30Hz-10kHz
Frequency Weighting: C –weighting
Time Weighting: Fast
Microphone: Electric condenser microphone.

Light

Range Resolution Accuracy

4000 Lux 1 Lux

40,000 Lux 10 Lux

Calibrated to standard incandescent lamp at color
temperature 2856 k .
Repeatability: ± 2%
Temperature Coefficient: ± 0.1% / °C
Off Angle Light: Cosine corrected.

20

± 5% rdg

+ 10 dgts

Photo detector: Silicon photo diode with filter mimicks
spectral sensitivity characteristic of C.I.E. (International
Commission on Illumination) photopia curve V (λ).

Spectral Sensitivity (%) versus Wavelength (nm)

% / nm 400 500 to 600 700

100%

80%

60%

40%

20%

Humidity

Range Resolution Accuracy

33% ~ 99% RH 1% RH 3.5% of rdg ± 5 dgts

Response Time: Allow 2 hours for accurate reading.

Temperature

Using External Probe

Range Resolution Accuracy

-4°F~+1400°F 1°F 3% of rdg ± 9 dgts

-20°C~+750°C 1°C 3% of rdg ± 5 dgts

Probe: K Type Thermocouple. Limit measurement to 300°F
when using probe provided with product. Use
appropriate K type thermocouple for measuring higher
temperatures.

21

Internal Sensor in Meter (Room Temperature)

Range Resolution Accuracy

32°F ~+122°F 0.1°F 3% of rdg ± 2 degrees

0°C ~+50°C 0.1°C 3% of rdg ± 1 degree

DC Voltage

Range Resolution Accuracy

400.0mV 0.1mV

4.000V 1.0mV

± 1.0% of rdg ± 4 dgts

40.00V 10mV

400.0V 100mV

± 1.5% of rdg ± 4 dgts

600V 1V
Input Impedance: 10MΩ.
Overload Protection: 600V CAT IV AC/DC
1000V CAT III DC
700V CAT III AC

AC Voltage

Range Resolution Accuracy

400.0mV 0.1mV ± 1.5%of rdg ± 15 dgts

4.000V 1.0mV

40.00V 10mV

± 1.0% of rdg ± 4 dgts

400.0V 100mV ± 1.5%of rdg ± 4 dgts

600V 1V ± 2%of rdg ± 4 dgts

Input Impedance: 10MΩ

22

Frequency Range: 50 to 400Hz
Overload Protection: 600V CAT IV AC/DC
1000V CAT III DC
700V CAT III AC

DC Current

Range Resolution Accuracy

400.0uA 0.1uA

4000uA 1uA

± 1.0% of rdg ± 4 dgts

40.00mA 10uA

400.0mA 100uA

4.000A 1mA

10.00A 10mA

± 1.2% of rdg ± 4 dgts

± 2.0% of rdg ± 5 dgts

Overload Protection: 500mA /660V and 10A / 600V fuse
Maximum Input: 400mA AC/DC on uA / mA ranges, 10A
AC/DC on 10A range (30 seconds max every 15 minutes).

AC Current

Range Resolution Accuracy

400.0uA 0.1uA

4000uA 1uA

± 1.2% of rdg ± 4 dgts

40.00mA 10uA

400.0mA 100uA

4.000A 1mA

10.00A 10mA

± 1.5% of rdg ± 4 dgts

± 2.0% of rdg ± 5 dgts

Overload Protection: 500mA /660V and 10A / 600V Fuse

23

AC Response: 50 Hz to 400 Hz
Maximum Input: 400mA AC/DC on uA / mA ranges, 10A
AC/DC on 10A range (30 seconds max every 15 minutes).

Resistance

Range Resolution Accuracy

400.0Ω 0.1Ω ± 1.5% of rdg ± 4 dgts

4.000kΩ 1Ω

40.00kΩ 10Ω

± 1.5% of rdg ± 3 dgts

400.0kΩ 100Ω

4.000MΩ 1kΩ ± 2.0% of rdg ± 3 dgts

40.00MΩ 10KΩ ± 2.5% of rdg ± 3 dgts
Maximum open circuit voltage: 2.8V.
Overload Protection: 600V AC/DC for 15 seconds

Capacitance

Range Resolution Accuracy

50.00nF 10pF ± 5.0% of rdg ± 70 dgts

500.0nF 0.1nF

5.000µF 1nF
± 4.0% of rdg ± 5 dgts

50.00µF 10nF

100.0µF 0.1uF

Input Protection: 600V AC/DC

24

Frequency

Range Resolution Accuracy

5.000Hz 0.001Hz

50.00Hz 0.01Hz

500.0Hz 0.1 Hz

± 1.2% of rdg ± 3 dgts

5.000kHz 1 Hz

50.00kHz 10Hz

500.0kHz 100Hz

5.000MHz 1kHz
± 1.5% of rdg ± 4 dgts

10.00MHz 10KHz

Sensitivity: 0.5V RMS at frequencies less than 1MHz ; 3V

RMS at frequencies greater than 1MHz ;

Input Protection: 600V AC/DC

Duty Cycle

Range Resolution Accuracy

5 to 95% 0.1% +/- 5% rdg

Diode and Continuity

Range Test Current Other

Diode Test 0 to 1.000V

Continuity

1.4mA, 2.8V

Open Circuit Voltage

Beeps if < 50Ω

Overload Protection: maximum 600V dc or 600V ac rms.

25

+/- 2% typ

5. CONTROL LOCATIONS AND DESCRIPTIONS

26

CONTROL LOCATIONS AND DESCRIPTIONS (cont.)

1. Humidity & Temperature Sensor

2. LCD Display

3. Function Switch

4. V/Hz%/Ω/Cap/ Temp Input Jack

5. COM Input Jack

6. uA/mA Input Jack

7. 10A Input Jack

8. Sound Level Sensor

9. Light Level Sensor

10. Hz/% Button
Selects Hz or Duty Cycle measurement when DMM is
set to Hz/% range or AC Voltage or AC Current ranges.

11. HOLD and Backlight Button

Press and release quickly (less than 2 seconds) to
HOLD (freeze) the reading on the LCD display. To
remove HOLD, press and release quickly again. To
turn on Backlight, press and hold until Backlight comes
on. To turn off Backlight, press and hold until
Backlight goes off. LCD shows ‘HOLD’ when it is on.

12. °C / °F Room Button

Press to change room temperature readout from °C
to °F .

13. MODE Button

The button to select AC or DC measurement when in A,
mA , and uA …. or select Ω,
appropriate annunciator appears on the LCD to
indicate the selected mode.

27

, •))) modes. The

14. Range Button

15. REL Button

16. AC Voltage LED

Press to change from Autoranging to manual ranging.
Press repeatedly to select the desired range. To return
to Autoranging, press and hold the button until ‘Auto’
appears in the display. The LCD annunciators indicate
the selected range.

The relative measurement feature allows you to make
measurements relative to a stored reference value. A
reference voltage, current, capacitance, etc. can be
stored and measurements made in comparison to that
value. This feature is usually used to ‘zero’ residual
readings on some ranges prior to taking
measurements. REL does not work on all ranges and
functions. To activate, first observe the reading to be
‘REL’ed’ on the LCD, then press and release the REL
button. The LCD should then indicate ‘zero’. Make the
desired measurements. To de-activate REL, press and
release the REL button again. ‘REL’ appears in the
display when REL is active.

This LED lights when the top of the meter is positioned
close to AC voltage. In some cases the LED may not
light, even tho’ AC voltage is present. DO NOT RELY
ON THIS LED TO INDICATE THE PRESENCE OF AC
VOLTAGE. DOING SO MAY RESULT IN INJURY TO
THE USER.

28

6. OPERATING INSTRUCTIONS

Measuring Sound Level

1. Set the Function Switch to the “dBC” position.

2. Hold the face of the meter perpendicular to the sound
source.

3. The sound level will be displayed.

Note:
Strong wind (over 20mph) striking the microphone can cause
reading errors.

Measuring Humidity

1. Place meter in the location to be measured. Allow meter

to set in this location for at least 2 hours.

2. Set the Function Switch to any position other than OFF.

3. Read Humidity (%RH) from the LCD.

Measuring Light Level

1. Set the Function Switch to “Lux” or “x10 Lux” range.

2. Hold the face of the meter perpendicular to the light

source.

3. Read the light level from the LCD display.

Notes:
If the LCD reads ‘OL’ (Over Load), set the meter to “x10 Lux”.
If already on the “x10 Lux” range, the light level exceeds the
measurement range of the meter.
When using the “x10 Lux” range, add a zero to the end of the
displayed value to obtain the correct light level.

29

Measuring Temperature (Room)

1. Place meter in the location to be measured. Allow meter

to set in this location for at least 1 hour.

2. Set the Function Switch to any position other than OFF.

3. Read Room Temperature from the LCD.

Note:
Select °C or °F readout using the “°C / °F Room “ Button.

Measuring Temperature (using probe)

1. Insert the black plug of the temperature probe into the
COM jack and red plug into the " V/Hz%/Ω/Cap/ Temp "
jack.

2. Set the Function Switch to °C or °F as desired.

3. Touch the tip of the probe to the object to be measured.

4. Read the temperature on the LCD.

Notes:
The included probe can measure up to approximately 300 °F
without damage. To measure higher temperatures, use a
high temperature probe.
If the ambient temperature of the meter is changed suddenly,
the meter may display erroneous readings until the meter
reaches the same temperature as its surroundings.

30

Measuring DC Voltage

1. Insert the black test lead into the COM jack and

red test lead into the “V/Hz%/Ω/Cap/ Temp” jack.

2. Set the Function Switch to the DCV range and connect
the test leads across the source or load under
measurement.

3. Read the DC voltage on the LCD.

4. If the voltage to be measured is less than 400mV, set
the meter to the DCmV range and then read the voltage
on the LCD.

Notes:
Use the RANGE button to manually select the desired DCV
range.
Use the REL button to ‘zero’ a reading.
Use the HOLD button to freeze a reading or turn on the
Backlight.

Measuring AC Voltage

1. Insert the black test lead into the COM jack and

red test lead into the “V/Hz%/Ω/Cap/ Temp” jack.

2. Set the Function Switch to the ACV range and connect
the test leads across the source or load under
measurement.

3. Read the AC voltage on the LCD.

4. If the voltage to be measured is less than 400mV, use
the RANGE button to manually select the 400mV
range.

31

Notes:
Use the RANGE button to manually select the desired ACV
range. The 400mV AC range can only be selected with the
RANGE button.
Use the REL button to ‘zero’ a reading.
Use the Hz% button to measure the Frequency or Duty
Cycle of the AC voltage.
Use the HOLD button to freeze a reading or turn on the
Backlight.

Measuring AC or DC Current

1. Insert the black test lead into the COM jack.

2. For current measurements up to 4000µA, set the

function switch to the ‘µA’ position and insert the red test
lead banana plug into the ‘µA/mA’ jack.

3. For current measurements up to 400mA, set the function

switch to the ‘mA’ position and insert the red test lead
banana plug into the ‘µA/mA’ jack..

4. For current measurements up to 10A, set the function

switch to the ‘10A’ position and insert the red test lead
into the ‘10A’ jack.

5. Select AC or DC measurement by pressing the MODE

button. The mode setting is shown by annunciators 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. Connect the black test probe tip to the negative side of

the circuit.

32

Connect the red test probe tip to the positive side of the
circuit.

8. Apply power to the circuit.

9. Read the current on the LCD display.

Notes:
Use the RANGE button to manually select current ranges.
Use the REL button to ‘zero’ a reading.
Use the Hz% button to measure the Frequency or Duty
Cycle of an AC current.
Use the HOLD button to freeze a reading or turn on the
Backlight.

Measuring Capacitance

1. Insert the black test lead into the COM jack and the red

test into the “V/Hz%/Ω/Cap/Temp” jack.

2. Set the Function Switch to the CAP position.

3. If the reading on the LCD display is not zero (this is

normal), press the REL button to zero the display.

4. Touch the test probe tips to the part under test.

5. Read the capacitance value on the display.

Notes:
NEVER TEST ‘CHARGED’ CAPACITORS. Attempting to do
so may result in damage to the product or injury to the user.
The capacitance ranges cannot be manually selected.
Capacitors larger than 10uF may take several seconds to
measure.

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Measuring Frequency

1. Insert the black test into the COM jack and the red test

lead into the V/Hz%/Ω/Cap/°C jack.

2. Set the Function Switch to the ‘Hz %’ position.

3. Touch the test probe tips to the circuit under test.

4. Read the frequency on the display.

Measuring Resistance

1. Set the Function Switch to the position.

2. Insert the black test lead into the COM jack and the

red test lead into the V/Hz%/Ω/Cap/Temp jack.

3. Touch the test probe tips across the circuit or part under

test.

4. Read the resistance in the display.

Notes:
When the test leads are not connected to a component or
circuit, the LCD will display ‘OL’.
DO NOT CONNECT THE TEST LEADS TO ANY PART OR
CIRCUIT WITH VOLTAGE PRESENT. DOING SO MAY
DAMAGE THE METER OR RESULT IN USER INJURY.

Measuring Diodes

1. Set the Function Switch to the position.

2. Insert the black test lead into the COM jack and the red

test lead into the V/Hz%/Ω/Cap/Temp jack.

3. Press the MODE button repeatedly until the diode

annunciator ‘ ‘ is visible on the LCD.

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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.

Note:
DO NOT CONNECT THE TEST LEADS TO ANY PART OR
CIRCUIT WITH VOLTAGE PRESENT. DOING SO MAY
DAMAGE THE METER OR RESULT IN USER INJURY.

Audible Continuity Test

1. Set the Function Switch to the position.

2. Insert the black test lead into the COM jack and the red

test lead into the V/Hz%/Ω/Cap/Temp jack.

3. Touch the test probe tips to the circuit you wish to check.

4. If the resistance is less than approximately 50Ω, the

beeper will sound. If the circuit is open, the display will
indicate “OL”.

AC Voltage Sensor

1. Set the Function Switch to any position other than OFF.

2. Holding the meter, position its top near wires suspected

as having ‘live’ AC voltage.

3. If the wires have 50 to 1000V AC (60Hz) the AC Voltage

LED will light.

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Note:

The AC Voltage Sensor will not work in all situations.
Metal in the vicinity can block the AC signal. Phase
cancellation may make it appear as if no AC is present, when
in fact dangerous AC is present. Bright sunlight may make it
appear as if the LED is not lit. NEVER RELY ON THE AC
VOLTAGE SENSOR TO INDICATE IF DANGEROUS
VOLTAGE IS PRESENT. DOING SO MAY RESULT IN
USER INJURY.

It is normal for the AC Voltage Sensor LED to light when
measuring AC voltages with the test leads.

7. MAINTENANCE

Your Triplett Model 9055 DMM is a precision measuring

instrument and, when used as described in this manual,

should not require maintenance.

However, periodic calibration of the meter will insure that it is

accurate and performing in accordance with its design

specifications.

A one year calibration interval is suggested.

To clean the outside of the meter, use a cloth dampened with

a mild detergent solution. Do not use any abrasive cleansers,

or chemical solvents that may damage the case of the meter.

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Battery and Fuse Replacement

If “ “ appears on the LCD display, replace the battery.

Remove 8 screws on the back cover and open the case.

Replace the exhausted battery. Reassemble case.

Fuses usually blow because of operator error. If a fuse blows,
examine the test setup and correct any problems before
replacing the fuse(s) and retesting. Open the case by
removing 8 screws. Replace the fuses only with fuses of
equal rating. Using inappropriate fuses may damage the
meter or result in user injury.

Warning:

Never open the case of the meter with the test leads
connected to the meter. Doing so may result in user injury.

Replacement Parts:
Test Leads ………………………………………... 79-808
Fuse 1: 10A / 600V fast blow, 1-1/4” x ¼” …….. 3207-132
Fuse 2: 500mA / 660V fast blow, 5 x 20mm ….. 3207-136

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Triplett Product Return Instructions

In the unlikely event that you must return your Triplett

equipment for repair, the following steps must be taken.

1) Call 1-800-TRIPLETT to obtain a Return Material

Authorization (RMA) number from Customer Service.

2) Enclose a copy of the original sales receipt showing date of

purchase.

3) Clearly print the RMA number on the outside of the

shipping container.

4) Return to:

Triplett / Jewell Instruments

850 Perimeter Road

Manchester, NH 03103

ATTN: Repair Dept.

8. Triplett Three Year Limited Warranty

Triplett warrants instruments and test equipment manufactured by it

to be free from defective material or workmanship and agrees to

repair or replace such products which, under normal use and service,

disclose the defect to be the fault of our manufacturing, with no

charge within three years of the date of original purchase for parts

and labor.

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Triplett Three Year Limited Warranty (cont.)

If we are unable to repair or replace the product, we will make a

refund of the purchase price. Consult the Instruction Manual for

instructions regarding the proper use and servicing of instruments

and test equipment. Our obligation under this warranty is limited to

repairing, replacing, or making refund on any instrument or test

equipment which proves to be defective within three years from the

date of original purchase.

This warranty does not apply to any of our products which have been

repaired or altered by unauthorized persons in any way 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 and fuses, not of our manufacture

used with this product are not covered by this warranty.

To register a claim under the provisions of this warranty, contact

Triplett’s Customer Service Department for a Return Authorization

Number (RMA) and return instructions. No returned product will be

accepted without an RMA number. Upon our inspection of the

product, we will advise you as to the disposition of your claim.

ALL WARRANTIES IMPLIED BY LAW ARE HEREBY LIMITED TO A

PERIOD OF THREE YEARS FROM DATE OF PURCHASE, AND

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Triplett Three Year Limited Warranty (cont.)

THE PROVISIONS OF THE WARRANTY ARE EXPRESSLY IN

LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED.

The purchaser agrees to assume all liability for any damages and

bodily injury which may result from the use or misuse of the product

by the purchaser, his employees, or others, and the remedies

provided for in this warranty are expressly in lieu of any other liability

Triplett may have, including incidental or consequential damages.

Some states (USA ONLY) do not allow the exclusion or limitation of

incidental or consequential damages, so the above limitation or

exclusion may not apply to you. No representative of Triplett / Jewell

Instruments or any other person is authorized to extend the liability of

Triplett in connection with the sale of its products beyond the terms

hereof.

Triplett reserves the right to discontinue models at any time, or

change specifications, price or design, without notice and without

incurring any obligation.

This warranty gives you specific legal rights, and you may have other

rights which vary from state to state.

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