Wavetek Meterman LP10A User manual

®
TM

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WARRANTY
The LP10A and LP25A Logic Probes are warranted against any defects of material
or workmanship within a period of one (1) year following the date of purchase of the
Logic Probe by the original purchaser or original user. Any Logic Probe claimed to
be defective during the warranty period should be returned with proof of purchase
to an authorized Wavetek Meterman Service Center or to the local Wavetek
Meterman dealer or distributor where your Logic Probe was purchased. See
maintenance section for details. Any implied warranties arising out of the sale of a
Wavetek Meterman Logic Probe, including but not limited to implied warranties of
merchantability and fitness for a particular purpose, are limited in duration to the
above stated one (1) year period. Wavetek Meterman shall not be liable for loss of
use of the Logic Probe or other incidental or consequential damages, expenses, or
economical loss or for any claim or claims for such damage, expenses or
economical loss. Some states do not allow limitations on how long implied
warranties last or the exclusion or limitation of incidental or consequential damages,

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so the above limitations or exclusions may not apply to you. This warranty gives
you specific legal rights, and you may also have other rights that vary from state to
state.
CERTIFICATIONS AND PRECAUTIONS
This instrument is EMC/EMI certified. All inputs are protected against continuous
overload conditions up to the limits of each function’s stated input protection (see
specifications). Never exceed these limits or the ratings marked on the instrument
itself. Always inspect your Logic Probe, test leads and accessories for signs of
damage or abnormality before every use. If an abnormal condition exists (broken or
damaged test leads, cracked case, display not reading, etc.), do not use. Never
ground yourself when taking measurements. Do not touch exposed metal pipes,
outlets, fixtures, etc., which might be at ground potential. Keep your body isolated
from ground and never touch exposed wiring, connections, test probe tips, or any
live circuit conductors. Do not operate instrument in an explosive atmosphere

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(flammable gases, fumes, vapor, dust.) Do not use this or any piece of test
equipment without proper training.
CAUTION: To avoid damaging the instrument, do not use it in a
place where ambient temperature exceeds 40°C.
CAUTION: To avoid damaging the instrument, do not input more
than 40 VAC or VDC.
CONTENTS Page CONTENTS Page
Warranty ii
Certifications and Precautions iii
Preparation for use 1
Introduction 1
Control descriptions 3
Operation 3
Maintenance and Repair 4
Specifications 7

1
PREPARATION FOR USE – UNPACKING
Your shipping carton should include the Logic Probe with 0.5 meter long cable
with a mini-alligator clip for the ground connection and a mini-grabber for the Vcc
connection and this manual. If any of the items are damaged or missing,
immediately return the complete package to the place of purchase for an
exchange.
INTRODUCTION
The LP10A and LP25A Logic Probes are logic troubleshooting instruments that give
visual (LED’s) and audio indications (LP25A only) of logic levels and pulses. They
will also capture positive or negative events as short as 30 nanoseconds. The
probe is powered by the circuit under test.

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TTL
HI
LO
TTL
CMOS
MEM
PULSE
LP25A
HI
LO
CMOS
MEM
PULSE
LP10A
LP25A
LP10A

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CONTROL DESCRIPTIONS
TTL/CMOS – set for logic family of the circuit under test.
PULSE/MEM
PULSE – normal operation mode for pulse or level detection.
MEM – pulse capture or memory.
OPERATION
Setup: Connect the black alligator clip to ground or common of the circuit under
test. Connect the red mini-hook clip to Vcc of the circuit under test.
Select TTL or CMOS with the TTL/CMOS switch depending upon the type of logic
being tested. TTL level is nominal 0 to 5 VDC and CMOS levels are 0 to 5 – 15
VDC. The PULSE/MEM switch should be in PULSE for Pulse or Logic level testing.

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Using the Logic Probe
Touch the LP10A or LP25A probe tip to the circuit point under test. The probes
LED’s indicate the logic level or signals present when the circuit node is probed.
The LED’s response is noted on page 11.
MAINTENANCE
If there appears to be a malfunction during the operation of the Logic Probe, the
following steps should be performed in order to isolate the cause of the problem:
①Review the operating instructions for possible mistakes in operating procedure.
②Inspect and test the Test Cables for a broken or intermittent connection. Any
repair of the Logic Probe should be performed only by a Factory Authorized Service
Center or by other qualified instrument service personnel. The probe case can be
cleaned with a mild solution of detergent and water. Apply sparingly with a soft
cloth and allow the Logic Probe to dry completely before using. Do not use
aromatic hydrocarbons or chlorinated solvents for cleaning.

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REPAIR
Read the warranty located at the front of this manual before requesting warranty or
non-warranty repairs. For warranty repairs, any probe claimed to be defective can
be returned to any Wavetek Meterman authorized distributor or to a Wavetek
Meterman Service Center for an over-the-counter exchange for the same or like
product. Non-warranty repairs should be sent to a Wavetek Meterman Service
Center. Please call Wavetek Meterman or enquire at your point of purchase for the
nearest location and current repair rates. All probes returned for warranty or non-
warranty repair or for calibration should be accompanied by the following
information or items: company name, customer’s name, address, telephone
number, proof of purchase (warranty repairs), a brief description of the problem or
the service requested, and the appropriate service charge (for non-warranty
repairs). Please include the test leads with the meter. Service charges should be
remitted in the form of a check, a money order, credit card with expiration date, or a
purchase order made payable to Wavetek Meterman or to the specific service

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SPECIFICATIONS
Input signal Levels LED’s BEEPER(LP25A)
Logic “1” TTL: > 2.3 V ±0.2 VDC HI (Red) ON Fixed Tone
CMOS: >70 % Vcc ±10% HI (Red) ON
Logic “0” TTL: < 0.8 V ±0.2 VDC LO (Green) ON Fixed Tone
CMOS: <30 % Vcc ±10% LO (Green) ON
Bad Logic Level or Open circuit none No Tone
Square Wave < 200 Hz HI and LO blinking Variable Tone
at frequency rate at frequency rate
Square Wave > 200 Hz HI and LO may or Variable Tone
may not be ON at frequency rate

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Input signal Levels LED’s BEEPER(LP25A)
Narrow Hi Pulse LO (Green) blinking Variable Tone
Low with POS pulse intensity depends on at frequency rate
pulse duty cycle
Narrow Lo Pulse HI (Red) blinking Variable Tone
High with NEG pulse intensity depends on at frequency rate
pulse duty cycle
PULSE/ PULSE uses the pulse detection modes listed above.
MEMory MEM allows the probe to capture a positive or negative pulse. The
YELLOW LED will come ON and stay ON until switch is reset to
PULSE. See page 10 for specifications.

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Electrical Specifications: LP10A LP25A
Power Supply 5 - 15 VDC 5 - 15 VDC
Power Supply Current @ 5V 30 mA 40 mA
@ 15 V 80 mA 90 mA
Power Supply Protection 20 VAC/VDC 20 VAC/VDC
Maximum Input voltage 40 VAC/VDC 40 VAC/VDC
(15 seconds)
Size 210(8.2) x 18(0.7) x 18(0.7) mm (in.)
Weight 38.1(1.3) 42.6(1.5) gm(oz)
TTL/CMOS selectable yes yes
Maximum Input Signal Frequency 20 MHz 20 MHz

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Minimum Detectable Pulse Width
Frequency 1 kHz 1 to 20 kHz 20 kHz to 20 MHz
Minimum Pulse width 100 ns 50 ns 30ns
Pulse amplitude + 3 V
Input Impedance 1 MΩ1 MΩ
Pulse Indicator Flash Time 500 mS 500 mS
Audible tone at pulse rate no yes
Operating Temperature 0 °C to 50 °C at 80 % R.H.
Storage Temperature -20 °C to 65 °C at 75 % R.H.

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Safety: This instrument is intended for use below the Low Voltage
Directive, thus is considered exempt from EN61010-1:1993.
EMC: This product complies with requirements of the following
European Community Directives: 89/336/EEC (Electromagnetic
Compatibility) and 73/23/EEC (Low Voltage) as amended by
93/68/EEC (CE Marking). However, electrical noise or intense electromagnetic
fields in the vicinity of the equipment may disturb the measurement circuit.
Measuring instruments will also respond to unwanted signals that may be present
within the measurement circuit. Users should exercise care and take appropriate
precautions to avoid misleading results when making measurements in the
presence of electronic interference.