401665 V1.01 9/98
General Continuity / Low Resistance Instructions for Testing
Lamps, Bulbs, and Fuses
a. Set the function select switch (figure 1) to the "0" position.
b. Set the sensitivity knob (figure 1) to the highest sensitivity setting
(where the audible tone is the loudest).
c. With one finger on continuity test plate, press the continuity test pin
(figure 1) to one side of the device under test.
d. Place other hand on opposite side of device under test. When audible
alert and LED appear, continuity is good (low resistance).
Special Continuity / Low Resistance Testing Instructions
Capacitance Low Resistance Testing
CAUTION!!
Discharge Capacitor by shorting its leads before testing!!
This procedure is basically the same as the procedure outlined in the
section "General Continuity Testing" described above except that the
audible tone and LED will appear intermittently (tone ON then OFF
periodically) when low resistance is measured.
Diode Low Resistance Testing
a. This procedure is basically the same as the procedure outlined in the
section "General Continuity Testing" described above except that the
diode should be checked in both directions (forward and reverse).
b. Audible tone and LED will appear in one direction but not in another
when a good diode is measured.
Coils, Transformers, Inductors Low Resistance Testing
a. This procedure is basically the same as the procedure outlined in the
section "General Continuity Testing" described above.
b. Audible tone and LED will appear when resistance measured is less
than 50 ohms indicating good continuity.
Transistor Low Resistance Testing
a. This procedure is basically the same as the procedure outlined in the
section "General Continuity Testing" described above.
b. For NPN transistors, the audible tone and LED appear when the
Collector (C) and Emitter (E) are measured with user's finger touching
the Base (B).
c. For PNP transistors, the audible tone and LED will appear when the
meter is touching the Base (B) and the user's finger alternately
touching the Collector (C) and Emitter (E).
d. Since a transistor's junction is the same as a diode. The audible tone
and LED status is read just as for a diode check.
Appliance plug and wiring Low Resistance Testing
a. This procedure is basically the same as the procedure outlined in the
section "General Continuity Testing" described above.
b. Refer to Fig. 3.
c. Audible tone and LED indicates low resistance (less than 50 ohms).
Battery
and DC Polarity Checks
CAUTION!! Maximum DC Voltage Testing = 36 VDC.
Do not test higher voltages,
damage to the meter and/or personal injury may result.
Polarity Check
a. Set Function Select Switch (Figure 1) to the "O" position.
b. Select highest sensitivity by turning the sensitivity knob backwards
(where the knob gradations are smaller).
c. Touch one side of battery or adaptor to continuity test pin (Figure 1).
Touch finger of one hand to other side of battery or adaptor. Touch
Continuity Test Plate with finger of other hand.
d. Audible tone and LED appear for Positive side of battery or adaptor
only.
Battery Check
a. Set Function Select Switch to the "O" position.
b. Select highest sensitivity by turning the sensitivity knob backwards
(where the knob gradations are smaller).
c. Touch one side of battery or adaptor to continuity test pin. Touch
finger of one hand to other side of battery or adaptor. Touch Continuity
Test Plate with finger of other hand.
d. If the Audible tone and LED appear for Positive side of battery, the
battery is charge. If the tone and LED appear for negative side, the
battery is weak.
Microwave Leakage (Radiation) Detect
a. Set Function Select Switch (Figure 1) to the "II" position.
b. Place a cup of water or food inside the oven
c. Set the oven to run for 1 minute on HIGH setting.
d. Move the meter slowly over and around the oven door edge and front
glass.
e. Audible tone and LED will appear (intermittently, ON and OFF) if
radiation leakage is detected.
Battery replacement
a. Slide and lift off the battery compartment cover
b. Remove old batteries, observing their polarity.
c. Install new batteries with proper polarity.
d. Replace battery compartment cover.
Battery Compartment
Slide Cover for Access
Batteries L1154 (4)
Service and Repair
Extech offers complete repair and calibration services for all of the
products we sell. For periodic calibration, NIST certification or repair of
any Extech product, call customer service for details on services
available. Extech recommends that calibration be performed on an
annual basis to insure calibration integrity.
WARRANTY
EXTECH INSTRUMENTS CORPORATION warrants this instrument to
be free of defects in parts and workmanship for one year from date of
shipment. If it should become necessary to return the instrument for
service during or beyond the warranty period, then contact the Customer
Service Department at (781) 890-7440 for authorization. A Return
Authorization (RA) number must be issued before any product is
returned to Extech. The sender is responsible for shipping charges,
freight, insurance and proper packaging to prevent damage in transit.
This warranty does not apply to defects resulting from action of the user
such as misuse, improper wiring, operation outside of specification,
improper maintenance or repair, or unauthorized modification. Extech
specifically disclaims any implied warranties or merchantability or fitness
for a specific purpose and will not be liable for any direct, indirect,
incidental or consequential damages. Extech's total liability is limited to
repair or replacement of the product.
The warranty set forth above is inclusive and no other warranty, whether
written or oral, is expressed or implied.
