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.
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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.
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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.
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Page 7
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.
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Page 8
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.
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Page 9
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.
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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
Page 11
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
Page 12
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.
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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.
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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.
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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.
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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.
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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,
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.
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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.
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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.
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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
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• 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.
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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
Page 23
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.
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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
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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
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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
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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
Page 28
5. CONTROL LOCATIONS AND DESCRIPTIONS
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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
Page 30
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.
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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.
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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.
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Page 33
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.
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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.
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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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