Tektronix TEKTOOLS DMM155 Manual de usuario

Tektronix

0 0

000

00 0

DMM155 & DMM157

Digital Multimeters

Instructions

070-8943-02

Tektronix

DMM155 & DMM157

Digital Multimeters

Instructions

070-8943-02

Table of Contents

Product Description

Controls and Connectors

Using the Multimeter

Preparing for Measurement

Measuring Voltage

Measuring Resistance

Checking Continuity

Testing Diodes

Measuring Capacitance (DMM157)

Measuring Current

Holding a Measurement

Offsetting a Measurement

Extending the Display Resolution

Selecting a Range

Resetting the Display

Using the Tilt Stand and Holster Hook

Using the Probe Holders

Replacing the Battery

Replacing the Fuses

Replacement Parts

Specifications

General Characteristics

Measurement Ranges and Accuracies

Tektronix products are covered by U.S. and foreign

patents, issued and pending. Information in this

publication supercedes that in all previously published

material. Specifications and price change privileges

reserved.

Tektronix, Inc., PO. Box 1000, Wilsonville, OR

97070-1000

TEKTRONIX and TEK are registered trademarks Of

Tektronix, Inc.

Safety

This manual contains information and warnings that must

be followed for operating the Instrument safely and

maintaining the product in a safe operating condition.

CAUTION.

Caution statements identify conditions or

LIApractices

that could result in damage to the

equipment or other property.

WARNING.

Warning statements identify conditions

La or practices that could result in personal injury or

loss of life.

Terms as Marked on Equipment

ATTENTION

Refer to manual

Do Not Operate Without Covers —

To avoid personal

injury, do not apply any voltage or current to the product

without the covers in place.

Electric Overload —

Never apply a voltage to a connec-

tor on the product that is outside the range specified for

that connector.

Do Not Immerse —

The product is not waterproof.

Product Description

The DMM155 and DMM157 are rugged, handheld digital

multimeters that allow you to make accurate measure-

ments quickly and easily. Whether you are a professional

or hobbyist, these instruments provide a useful range of

features:

•

Shock-absorbing cover

•

Tilt stand, holster hook, and probe holders

•

33 digit (2000 count) LCD display

•

Auto range (volts, ohms) and manual selection

•

Measurement hold or offset

•

Measures DC and AC voltages, DC and AC current,

resistance, diode voltage, continuity, and capacitance

(DMM157)

•

Overvoltage and overload protection

•

Low-power ohms setting

•

Diode and continuity tester with audible signal

•

Alarm that warns of improper connections to the

current inputs

•

Recessed input jacks for safety

•

Automatic power off after 30 minutes prolongs battery

life

•

Low-battery indicator

•

Uses standard 9 V battery

•

Double Insulated

omo

ir rp,i

3,u

10A mA COM V11-01-

Tektronix

Figure 1: Controls and Connectors

Controls and Connectors

See Figure 1 for location of controls and connectors.

HOLD —

Holds or "freezes" the measurement

display.

OFFSET --

Offsets the Measurement. This subtracts

the last two digits from subsequent measurements.

Vf1-01- (or VO

) —

Input for measuring volts,

ohms, diodes, and continuity. (The

DMM157

also

measures capacitance.)

COM — Input for the common (ground reference)

connection.

mA —

Input for measuring current up to 200 mA.

10A —

Input for measuring current above 200 mA.

Rotary Switch —

Selects the multimeter function:

volts, ohms, diodes, continuity, or amperes. (The

DMM157 also measures capacitance.)

AC/DC, D/LPfl —

Selects AC or DC voltage, AC or

DC current, high- or low-power ohms.

RANGE, RESET —

Press this button to select one

measurement range. Hold it down for 2 seconds to

return to auto range. This control will also restore the

display after automatic power off.

10.

Digital

Display —

This liquid crystal display (LCD)

has a maximum reading of 1999

(33.

digit). The

display indicates auto range, auto polarity, decimal

point, overrange, AC (DC implied), 0/LPO,

measurement units, hold, and offset.

Using the Multimeter

Please read this section to learn how to use your

DMM155 or DMM157 Digital Multimeter safely and

efficiently.

Preparing for Measurement

Wait 30 seconds after turning on the meter before

making a measurement.

Set the rotary switch to the function you want to use

before connecting the probes to voltage or current.

Disconnect the test leads from the voltage or current

before selecting a new function.

Disconnect power to the equipment under test if you

are measuring resistance or capacitance, testing

continuity, or checking diodes.

If you use the multimeter near equipment that

generates electromagnetic interference, the display

may be unstable or indicate incorrect measurement

values.

Measuring Voltage

A WARNING.

Do not apply more than 600 VDC or 600

LAVAC

ms to the input. Do not apply more than

600 VDC or 600 VAC

ms between the COM input

terminal and earth ground. Exceeding these limits

creates a shock hazard to the user and can also

damage the meter.

Use extreme caution to avoid personal contact with

high voltage when measuring in high voltage circuits.

1. Connect the black test lead to the COM (—) terminal

and the red test lead to the

VD (+)

terminal.

2 Set the rotary switch to the

function.

3 Press the

AC/DC

button to select AC or DC

measurement. (The display indicates AC but not DC.)

4 Connect the test leads across the source or load. The

multimeter automatically selects the range and

displays the polarity and voltage. Input voltage that

exceeds the selected range causes the

most-significant digit ("1" or '-1") to flash.

Measuring Resistance

I. Connect the black test lead to the COM terminal and

the red test lead to the vn terminal.

Set the rotary switch to the Q position to measure

resistance up to 2 MO; set it to the

2-20

MD position

to measure resistance from 2 MO to 20 MO.

A WARNING.

To prevent possible personal injury or

Udamage to the meter, make sure the device being

tested is off and no source of voltage is present.

To measure in-circuit resistance shunted by

semiconductor junctions, press the

D/LPD

switch for

lower power resistance measurements. The display

indicates "LPO".

Connect the test leads across the resistance. For the •

best accuracy when measuring low resistance, short

the test leads together and press

RANGE:

then press

the

OFFSET

button. This selects the lowest range and

compensates it for the resistance of the test leads.

Checking Continuity

1. Connect the black test lead to the COM terminal and

the red test lead to the

Vfl

terminal.

2. Set the rotary switch to the ))-614- position.

3. Connect the test leads adross the resistance. The

beeper sounds if the measurement is lower than 25

and continues to sound until the resistance increases

to greater than 200 O.

Testing Diodes

1 Set the rotary switch to ))-ot- position.

NOTE.

Do not use AC volts for testing diodes.

2 Connect the black test lead to the COM (—) terminal

and the red test lead to the

vn (+)

terminal.

3. Connect the test leads across the diode to check.

Normally, the forward voltage drop of good silicon

diodes is between 0.400 V and 0.900 V. If the diode

under test is defective, "000" (short circuit) or

approximately 2.6 V (non-conducting) is displayed.

Reverse Bias Check.

The display reads

approximately 2.6 V with the diode reverse biased.

The multimeter displays "000" or some other value

lower than 2.6 V if the diode is shorted (or 'resistive).

Measuring Capacitance (DMM157)

Connect the black test lead to the COM terminal and

the red test lead to the V0

terminal.

Set the rotary switch to the range needed

(2pF-200 pF)

for the capacitance to be measured.

Measure capacitance by placing the test leads across

the component. Observe polarity markings (if any) on

the capacitor by placing the red lead on the (+) and

the black lead on the (—) component leads.

Measuring Current

Connect the black test lead to the COM terminal and

the red test lead to the

terminal for a maximum of

200 mA. For a maximum of 10 A, move the red test

lead to the

10 A

terminal. (The multimeter will indicate

to a maximum of 13 A, but the maximum measuring

time at that current level is 30 seconds.)

Set the rotary switch to the range needed

(2 mA-10 A)

for the current to be measured. Select

AC or DC current measurement using the

AC/DC

switch.

NOTE.

If you do not know the correct current range,

start at the highest range and work down.

Connect the test leads in series with the load under

measurement.

Holding a Measurement

To retain a measurement, press the

HOLD

button. The

hold indicator

(H)

appears on the display and the reading

will not change. Press the

HOLD

button again to

continue with normal operation.

Offsetting a Measurement

Pressing the

OFFSET

button subtracts the two least

significant digits from a selected range. You must not be

in auto range. The multimeter offsets subsequent mea-

surements.

The offset feature is especially useful when you want to

subtract the lead resistance from very low resistance

measurements or detect small voltage, capacitance, or

current variations.

Extending the Display Resolution

Once you exceed the count of 1999 on a selected range

you may still interpret the reading up to a count of 2999:

Select the next higher range (or auto range) and verify

that the count does riot exceed 299.

Return to the lower range. Interpret the flashing "1" as

a "2" and read the lower three digits.

Selecting a Range

Press

RANGE

to make repeated measurements without

automatically ranging. The first press selects the same

range and removes the

AUTO

symbol. Continue to press

the

RANGE

button to step through the available ranges.

Press and hold the

RANGE

button for 2 seconds to

return to auto range.

If you apply a voltage that exceeds the maximum reading

of the display, the multimeter flashes the most significant

digit to indicate overrange. Select a higher range or auto

range to display the measurement.

Resetting the Display

If you leave the multimeter on longer than 30 minutes

without using it, the display will automatically turn off. To

return the display without disturbing any other setup,

press

RESET (RANGE).

Using the Tilt Stand and Holster Hook

Swing the stand out for easier meter reading.

Swing the upper holster hook out and

hook it over a door or mount the

multimeter

to a

vertical surface with a

screw.

Figure 2: Using the Tilt Stand and Holster Hook

Replacing the Battery

The meter uses a single 9 V battery. Refer to Figure 4,

and use the following procedure to replace the battery:

Disconnect the test leads from any circuit under test

and turn off the meter.

Remove the test leads and the protective holster from

the meter.

Lay the meter face down on a work surface that will

not damage the meter face.

Remove the screw from the case bottom using a small

Phillips screwdriver.

Gently lift the case bottom at the end nearest the LCD

until it unsnaps from the case top.

Lift the battery from the case top, and carefully

disconnect the battery connector from the battery.

Snap the battery connector to the terminals of the

replacement battery, and replace the battery in the

case top.

Replace the case top. Make sure the battery leads do

not get pinched between the case top and case

bottom. Make sure all the gaskets properly seat and

the two snaps on the case top engage.

Reinstall the screw in the case bottom.

Using the Probe Holders

(

Figure 3: Using the Probe Holders

Case

Bottom

Case Top

9 V

Battery

Figure 4: Replacing the Battery

Replacing the Fuses

Refer to Figure 5, and use the following procedure to

examine or replace the meter fuses:

Perform steps 1 through 5 of the

Replacing the Battery

procedure on page 11.

Lift the circuit board from the case top. Do not remove

the screws from the circuit board.

Remove a defective fuse by gently prying one end of

the fuse loose and sliding the fuse out of the fuse

holder.

Install a new fuse of the same size and rating. Make

sure the new fuse is centered in the fuse holder.

CAUTION.

prevent product damage, make sure

Lathat the rotary switch and circuit board switch are

both in the OFF position. Notice the pointing

direction of the rotary switch and circuit board switch

are 180 opposite each other

Replace the case top. Make sure all the gaskets

properly seat and the battery leads are not pinched

between the two halves of the case. Make sure the

two snaps on the case top engage.

Reinstall the screw in the case bottom.

Este manual sirve para los siguientes modelos

Tabla de contenidos

Otros manuales de Multímetro de Tektronix

Tektronix

Tektronix DM505 Manual de usuario

Tektronix

Tektronix DM2510 Manual de usuario

Tektronix

Tektronix THM500 Series Manual de usuario

Tektronix

Tektronix DM501A Manual de usuario

Tektronix

Tektronix TX-DMM TX1 Manual de usuario

Tektronix

Tektronix DM501A Manual de usuario

Tektronix

Tektronix Keithley DMM7510 Manual de usuario

Tektronix

Tektronix DMM4040 Manual de usuario

Tektronix

Tektronix Keithley DMM7510 Manual de usuario

Tektronix

Tektronix KEITHLEY DAQ6510 Manual de uso y cuidado

Tektronix

Tektronix DMM150 Manual de usuario

Tektronix

Tektronix DMM912 Manual de usuario

Tektronix

Tektronix KEITHLEY DMM6500 Manual de uso y cuidado

Tektronix

Tektronix DM 502 Manual de usuario

Tektronix

Tektronix VX4234 Manual de usuario

Tektronix

Tektronix DMM4040 Guía de configuración

Tektronix

Tektronix DM 5110 Manual de usuario

Tektronix

Tektronix Keithley 3700A Series Manual de usuario

Tektronix

Tektronix KEITHLEY 2100 Manual de uso y cuidado

Tektronix

Tektronix DM 504A Manual de usuario

Tektronix

Tektronix DM2510 Manual

Tektronix

Tektronix 47E5A Manual de usuario

Tektronix

Tektronix DM 5010 Manual de usuario

Tektronix

Tektronix 7D13 Manual de usuario

Manuales populares de Multímetro de otras marcas

Agilent Technologies

Agilent Technologies 34420A Manual de usuario

Fluke

Fluke 83 Manual de usuario

Hameg

Hameg HM 8012 Manual de usuario

Mastech

Mastech MY70 Manual de usuario

Steren

Steren MUL-300 Manual de usuario

Somogyi Elektronic

Somogyi Elektronic home SMA 92 Manual de usuario

Gossen MetraWatt

Gossen MetraWatt METRAmax 6 Manual de usuario

PeakTech

PeakTech 4000 Manual de uso y cuidado

YOKOGAWA

YOKOGAWA 90050B Manual de usuario

Gossen MetraWatt

Gossen MetraWatt METRALINE DMM16 Manual de usuario

Fluke

Fluke 8846A Manual de operación y mantenimiento

Tempo Communications

Tempo Communications MM200 Manual de usuario

Elenco Electronics

Elenco Electronics CM-1555 Manual de usuario

Mastech

Mastech MS8238C Manual de usuario

SDAR

SDAR 830A, 830B, 830D, 830C Manual de usuario

RS PRO

RS PRO RS-9519BT Manual de usuario

BGS technic

BGS technic 8890 Manual de usuario

Amprobe

Amprobe Hexagon 60 Manual de usuario