Wavetek LP25A, LP10A User Manual

®

TM

iii

WARRANTY

The LP10A and LP25A Logic Probes are warranted against any defects of material
or workmanship within a peri od of one (1) year following the date of pur cha s e 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 distri bu tor wh er e your Lo gi c Prob e w as purc has ed. 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

v

(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 ar e dam ag ed 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.

2

TTL

HI

LO

TTL

CMOS

MEM

PULSE

LP25A

HI

LO

CMOS

MEM

PULSE

LP10A

LP25A

LP10A

3

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.

4

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.
② Inspect and test the Test Cables for a broken or intermittent connection. Any

repair of the Logic Probe shoul d be pe rfo rm ed only by a Factory Authorize d Servi ce
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.

5

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 non­warranty 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

6

center. For minimum turn-around time on out-of-warranty repairs please phone in
advance for service charge rates. The probe should be shipped with transportation
charges prepaid to one of the following addresses or to a service center:

in U.S.A. in Canada in Europe

Wavetek Meterman Wavetek Meterman Wavetek Meterman
1420 75th Street SW 400 Britannia Rd. E.Unit #1 52 Hurricane Way
Everett, WA 98203 Mississauga, ON L4Z 1X9 Norwich, NR6 6JB, U.K.
Tel: [phone] Tel: [phone] Tel: int + 44-1603-404824
Fax: [phone] Fax: [phone] Fax: int + 44-1603-482409

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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

8

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 i nte nsit y depen ds on at frequency rat e

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.

9

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

10

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 MΩ 1 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.

11

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 inter fe ren ce.

®

TM

Manual Revision Date 07/00
Manual Part Number 1566429

Information contained in this manual is proprietary to Wavetek
Meterman and is provided solely for instrument operation and
maintenance. The information in this document may not be
duplicated in any manner without the prior approval in writing
from Wavetek Meterman.
Specifications subject to change.

Wavetek is a trademark of Wavetek Wandel Goltermann

© Wavetek Meterman, 2000

U.S. Service Center
Wavetek Meterman
1420 75th Street SW
Everett, WA 98203
Tel: [phone]
Fax: [phone]

Canadian Service Center
Wavetek Meterman
400 Britannia Rd. E.Unit #1
Mississauga, ON L4Z 1X9
Tel: [phone]
Fax: [phone]

European Distribution Center
Wavetek Meterman
52 Hurricane Way
Norwich, NR6 6JB, England
Tel: [phone]
Fax: [phone]