Amprobe PM55A Manual de usuario

PM55A

Automatic Precision Pocket Meter

Users Manual

•Mode d’emploi

•Bedienungshandbuch

•Manuale d’Uso

•Manual de uso

PN 2728864

July 2006

English

SELECT

Press for 2 seconds

to turn meter on.

PM55A

ALCD display

BRotary switch to select functions

CSELECT-button to select alternate functions and turn the power off and on.

DPermanently attached red test lead for positive (+) polarity and black test lead for ground

reference (-)

PM55A Pocket Meter

Contents

Introduction........................................................................................................2

Safety Information..............................................................................................2

Symbols Used in this Manual ..........................................................................3

Turning the Meter On and Off .............................................................................3

Making Measurements .......................................................................................4

AutoTectMode ..............................................................................................4

Continuity, Audible With Symbolic Display......................................................5

Electric Field EF-Detection, VolTect..............................................................5

Voltage.............................................................................................................7

Resistance .......................................................................................................7

Frequency ........................................................................................................7

Capacitance .....................................................................................................7

V dc, V ac, and Line-Level Hz...........................................................................7

Diode ...............................................................................................................7

600 Ω..............................................................................................................8

µA dc and µA ac ..............................................................................................8

Product Maintenance..........................................................................................8

Maintenance ....................................................................................................8

Cleaning...........................................................................................................8

Troubleshooting...............................................................................................8

Battery Replacement........................................................................................8

Repair .................................................................................................................9

Specifications ...................................................................................................11

Introduction

This unique meter has a full complement of features in a package only 3/8 inch thick, weighing less

than 3 oz. for the utmost in shirt-pocket portability. The PM55A is fully autoranging and has an

oversized, easy-to-read digital display. With an AutoTect™ feature that enables the meter to detect

and display measurements of AC Volts, DC Volts and Resistance. The PM55A offers VolTect™, a

built-in non-contact voltage detection of AC voltage. Although very small, this meter is fully UL safety

rated to CAT III levels and is UL listed. The AmprobePM55A precision meter includes

measurement extras such as capacitance, frequency, DC microamps and safety extras such as

transient protection to 4 kV and overload protection to 600 V.

Safety Information

•The PM55A Digital Multimeter is certified for cULus and EN61010-1:2001; CAT II 600 V, CAT III

300 V, class 2 and

pollution deg. 2.

•This instrument is EN61010-1 certified for Installation Category II

(600 V). It may only be used to make measurements on energy limited circuits within equipment

and not directly connected to mains.

•This instrument is EN61010-1 certified for Installation Category III

(300 V). It is recommended for use with local level power distribution, appliances, portable

equipment, etc., where only smaller transient overvoltages may occur, and not for primary supply

lines, overhead lines and cable systems.

•Do not exceed the maximum overload limits per function (see specifications) nor the limits

marked on the instrument itself. Never apply more than 600 V between the test lead and earth

ground.

•Inspect the DMM, test leads and accessories before every use. Do not use any damaged part.

•Never ground yourself when taking measurements. Do not touch exposed circuit elements or test

probe tips.

•Do not operate the instrument in an explosive atmosphere.

•Exercise extreme caution when: measuring voltage >20 V // current >10 mA // AC power line with

inductive loads // AC power line during electrical storms // current, when the fuse blows in a

circuit with open circuit voltage > 600 V // servicing CRT equipment.

•Remove test leads from circuit before opening the case.

•Always measure current in series with the load – NEVER ACROSS a voltage source.

Symbols Used in this Manual

N Battery WRefer to the manual

TDouble insulated XDangerous Voltage

FDirect Current JEarth Ground

BAlternating Current RAudible tone

PComplies with EU directives >

Underwriter Laboratories, Inc.

Turning the Meter On and Off

•Press the SELECT button for approximately 2 seconds to turn the meter on.

•To turn the meter off, press the SELECT button until the display goes blank.

Making Measurements

All measurements described in this manual use the Red test lead for positive (+) polarity and Black

test lead for Ground reference (-) unless otherwise specified

AutoTectmode is the default function in Auto V-Ωposition. Press the SELECT button momentarily

to select and step through the functions:

•AutoTect

•Continuity

•EF

•ACV

•DCV

•Ω

•Hz

•Cx

•AutoTect

AutoTectMode

This AutoTectfeature automatically selects measurement function of

V dc, V ac, or resistance based on the input via the test leads.

●With no input, the meter displays Auto when it is ready.

●With no voltage signal but a resistance below 6 MΩis present, the meter displays the resistance

value.

●When a signal above the threshold of 1.2 V dc or 1.5 V ac up to the rated 600 V is present, the

meter displays the appropriate voltage value in dc or ac, whichever larger in peak magnitude. The

Happears indicating ac V. The default of no icon is dc V.

●The AutoTecttest mode input impedance is lower than most digital multimeters and LoZ is

displayed on the LCD. Switch to the manually selected V dc or V ac, if the circuit being tested is

sensitive to the meter input impedance. Input impedance is approximately 900 Ω, helping

determine if voltage is from leakage (so-called “ghost” voltages) or a hard connection. “Ghost”

voltages will be zeroed out by the low input impedance.

●Overload-Alert Feature

When more than 600 V is present, the meter displays OL with a warning beep tone. Disconnect

the test leads from the signal immediately to avoid hazards.

•Range-Lock Feature

When a measurement reading is displayed in the AutoTectmode, press the SELECT button

momentarily to lock the function-range. The LCD annunciator Auto turns off. Range-lock can

speed up repetitive measurements. Press the SELECT button momentarily again to return to

AutoTectmode.

•When making resistance measurements in AutoTectmode, an unexpected display of voltage

readings alerts you that the circuit under test is still energized.

Continuity, Audible With Symbolic Display

With Auto on the LCD, press the SELECT button once to select Continuity function. The meter will

show a symbolic open-switch display when it is ready. A continuous beep tone and a symbolic

closed-switch indicates a closed circuit. Continuity is used for checking wiring connections and

operation of switches.

Electric Field EF-Detection, VolTect

With Auto displayed on the LCD, press the SELECT button momentarily 2 times to select the EF-

Detection feature. The meter displays EF when it is ready. Signal strength is indicated as a series of

bargraph segments on the display and variable beep tones. See the VolTectspecifications later in

this manual for a complete description of the bar graph indicators.

•An antenna is located at the top left corner of the meter, which detects electric field surrounding

current-carrying conductors. It is ideal for tracing live wiring connections, locating wiring

breakage and to distinguish between live or earth connections.

•For more precise indication of live wires, such as distinguishing between live and ground

sockets, use or V ac manual function selection for direct contact voltage measurements.

Note

For Maximum sensitivity, hold the meter away from the VolTect



corner.

SELECT

PM55A

Voltage

With Auto on the LCD, press the SELECT button 3 times to select V ac function. The meter displays

LoZBVwhen it is ready.This function is auto-ranging.

With Auto on the LCD, press the SELECT button 4 times to select V dc. The meter displays LoZ V

when it is ready. This function is auto-ranging.

Resistance

With Auto on the LCD, press the SELECT button 5 times to select resistance function, The meter

displays MΩwhen it is ready. This function is auto-ranging.

Frequency

With Auto on the LCD, press the SELECT button 6 times to select frequency function, The meter

displays Hz when it is ready. This function is auto-ranging.

Capacitance

With Auto on the LCD, press the SELECT button 7 times to select capacitance function, The meter

displays nF when it is ready. This function is auto-ranging.

Return to Auto

Press the SELECT button 8 times to return to AutoTecttest mode.

V dc, V ac, and Line-Level Hz

Turn the rotary switch to the V position to select common impedance

Hi-Z voltage measurements. V dc is the default function. Press SELECT button momentarily to select

V ac. The AC annunciator Bappears. Press momentarily again to select the Line-Level Hz function.

Line-Level Hz input sensitivity varies automatically with V ac range selected when Line-Level Hz is

selected. Measuring the signal in V ac function WHILE selecting Line-Level Hz function in that V ac

range automatically sets the most appropriate sensitivity for higher voltage applications. This can

avoid electrical noises as in 110/220 V line voltage applications. For example, If the reading shows

zero due to insufficient signal levels, select Line-Level Hz function BEFORE making measurements (at

6 V ac range) will set the highest sensitivity.

Diode

Turn the rotary selector to the GR /600 Ωposition. Diode test is the default function. The reading

shows the approximate voltage drop across the test leads. Normal forward voltage drop (forward

biased) for a good silicon diode is between 0.400 V to 0.900 V. A reading higher than that indicates a

leaky diode (defective). A zero reading indicates a shorted diode (defective), and the meter will give a

long beep as continuity warning. OL indicates an open diode (defective). Reverse the test leads

connections (reverse biased) across the diode. The digital display shows OL if the diode is good. Any

other readings indicate the diode is resistive or shorted (defective).

600 Ω

Press the SELECT button to select the lowest 600 Ωrange for lower resistance measurements. It is

an extended range to complement the AutoTectresistance function.

µA dc and µA ac

Turn the rotary switch to the µAposition, µA dc is the default function. There is no annunciator for

dc. Press the SELECT button momentarily to select µA ac. The ac annunciator Bappears.

Product Maintenance

Maintenance

Do not attempt to repair this meter. It contains no user serviceable parts. Repair or servicing should

only be performed by qualified personnel.

Cleaning

Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or solvents. If

the meter is not to be used for periods of longer than 60 days, remove the battery and store it

separately

Troubleshooting

If the instrument fails to operate, check battery, leads, and replace battery as necessary. Double-

check operating procedure as described earlier in this manual.

If the display locks up, press the SELECT button for approximately 6 seconds to reset the

microprocessor.

If the instrument voltage-resistance input is subjected to high voltage transient (mostly caused by

lightning or switching surge to your system) by accident or abnormal conditions of operation, the

series fusible resistors will react (become high impedance) like fuses to protect the user and the

instrument. Most measuring functions through this input will then be open circuit. The series fusible

resistors and the spark gaps should then be replaced by qualified technician. Refer to the LIMITED

WARRANTY section for obtaining warranty or repairing service.

Battery Replacement

If the meter starts up with persistent resetting display or with low battery icon Nturns on, replace

the battery. The meter uses one 3 V coin battery IEC-CR2032.

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