Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

Operation

AC or DC Voltage Measurement

1. Set the function switch to the “AC/DCV” position

2. Press the SELECT button to select AC or DC voltage

measurement

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

observe the correct polarity (red lead to positive, black lead to

negative).

4. Read the voltage on the display

Resistance/Continuity Measurement

WARNING:

To avoid electric shock, disconnect power to the unit

under test and discharge all capacitors before taking any

resistance measurements. Remove the batteries and unplug the

line cords. Never measure continuity on circuits or wires that

have voltage on them.

1. Set the function switch to the “ Ω

•)))

” position.

2. Connect the test leads to the circuit to be measured.

3. Read the value on the display.

4. For Continuity tests, press the SELECT button until the “•)))“

symbol appears in the display.

5. If the resistance is less than 60 ohms, an audible tone will sound.

Capacitance Measurement

WARNING:

To avoid electric shock, disconnect power to the unit

under test and discharge all capacitors before taking any

capacitance measurements. Remove the batteries and unplug

the line cords. Never measure continuity on circuits or wires that

have voltage on them.

1. Set the function switch to the “ Ω

•)))

” position.

2. Press the SELECT button until “nF” appears in the display.

3. Press the RELATIVE button to zero the display

4. Connect the test leads to the capacitor to be measured.

5. Read the value on the display.

Diode Test

WARNING:

To avoid electric shock, do not test any diode that

has voltage on it.

1. Set the function switch to “ Ω

2. Press the SELECT button once to enter Diode Test. The “ “

symbol will appear in the display.

3. Touch the test probe tips to the diode or semiconductor junction

you wish to test. Note the meter reading.

4. Reverse the test lead polarity by reversing the red and black

leads. Note this reading.

5. The diode or junction can be evaluated as follows:

A. If one reading shows a value and the other reading shows OL,

the diode is good.

B. If both readings show OL, the device is open.

C. If both readings are very small, or 0, the device is shorted

AC/DC Current Measurement

1. Set the function switch to the “mA AC/DC” position.

2. Press the SELECT button to measure AC or DC mA.

3. Remove power from the circuit under test and open the circuit at

the point where you wish to measure current.

4. Touch the black test probe tip to the negative side of the circuit

and touch the red test probe tip to the positive side of the circuit.

5. Apply power to the circuit.

6. Read the value on the display

Frequency/Duty Cycle Measurement

1. Set the function switch to the “HZ/DUTY” position.

2. Press the Hz/DUTY button once to display Duty Cycle %. Pressing

the button again will toggle the display to frequency (Hz).

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

observe the correct polarity (red lead to positive, black lead to

negative).

4. Read the value on the display.

Features

Relative Button

The relative measurement feature allows you to make measurements

relative to a stored reference value. A reference voltage can be

stored and measurements made in comparison to that value. The

displayed value is the difference between the reference value and the

measured value.

1. Perform the measurement as described in the operating

instructions.

2. Press the RELATIVE button to store the reading in the display and

the "REL" indicator will appear on the display.

3. The display will now indicate the difference between the stored

value and the measured value.

4. Press the RELATIVE button to exit the relative mode.

Note:

The Relative function does not operate in the Frequency

function.

Data Hold Button

The Data Hold function allows the meter to “freeze” a measurement

for later reference

1. Press the “DATA HOLD” button to “freeze” the display, the

“HOLD” indicator will appear.

2. Press the “DATA HOLD” button to return to normal operation.

Auto Power Off

1. To save power, the display automatically turns off in 30 minutes.

2. Press the SELECT button to turn display back on.

3. To cancel Auto Power Off, set the function switch to the off

position. Hold down the SELECT button and turn the function

switch to the desired position and release the SELECT button after

3 seconds.

Maintenance

WARNING

: Disconnect the test leads from any source of voltage

before removing the back cover or the battery/fuse door. Do not

operate your meter until the rear housing is in place and fastened

securely.

Replacing the Battery

1. Remove the rubber holster (if in place)

2. Remove Philips head screw and lift off the rear housing of the

meter.

3. Replace old battery with fresh CR2032 type button battery.

4. Replace the rear cover and secure the screw.