Polar Electro Toneohm 550A Manuale utente
Polar Instruments Ltd.
Garenne Park
Rue de la Cache
St. Sampson
Guernsey
Channel Islands
GY2 4AF
England
Fax: 44 (0)1481 52476
MAN 149-9603
TONEOHM 550A
OPERATOR
MANUAL
TONEOHM 550A SHORTS LOCATOR OPERATOR MANUAL
WARRANTY
For a period of one year from its date of purchase new and undamaged from Polar
Instruments Ltd, POLAR INSTRUMENTS LTD or its authorized distributors will,
without charge, repair or replace at its option, this product if found to be defective in
materials or workmanship, and if returned to POLAR INSTRUMENTS LTD or its
authorized distributors transport prepaid. This warranty is expressly conditioned
upon the product having been used only in normal usage and service in accordance
with instructions of POLAR INSTRUMENTS LTD and not having been altered in any
way or subject to misuse, negligence or damage, and not having been repaired or
attempted to be repaired by any other than POLAR INSTRUMENTS LTD or its
authorized distributors. EXCEPT FOR THE FOREGOING EXPRESS WARRANTY
OF REPAIR OR REPLACEMENT POLAR INSTRUMENTS LTD MAKES NO
WARRANTY OF ANY KIND, INCLUDING BUT NOT LIMITED TO, ANY EXPRESS
OR IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE, AND POLAR INSTRUMENTS LTD SHALL NOT BE
LIABLE FOR ANY DAMAGES, WHETHER DIRECT OR NOT OR OTHERWISE,
BEYOND REPAIR OR REPLACING THIS PRODUCT.
Copyright Polar Instruments Ltd. 1995
DECLARATIONS
TONEOHM 550A OPERATOR MANUAL
ii
ELECTROMAGNETIC COMPATIBILITY
European Community Directive Conformance Statement
This product is in conformity with the protection requirements of EC Council Directive
89/336/EEC on the approximation of the laws of the Member States relating to
electromagnetic compatibility.
A declaration of conformity with the requirements of the Directive has been signed by
POLAR INSTRUMENTS (UK) LTD
11 College Place
London Road
Southampton
England
SO1 2FE
This product satisfies EN50081-1:92 and EN 50082-1:92
SAFETY
iii
SAFETY
WARNING
The LIVE and NEUTRAL lines on this unit are BOTH fused.
This unit contains no user-serviceable parts. When the unit is connected to its supply,
the opening of covers or removal of panels is likely to expose dangerous voltages. To
maintain operator safety, do not operate the unit unless the enclosure is complete and
securely assembled.
GROUNDING
This unit must be earthed (grounded); do not operate the instrument with the safety
earth disconnected. Ensure the instrument is connected to an outlet with an effective
protective conductor terminal (earth). Do not negate this protective action by using an
extension cord without a protective conductor.
Note: This instrument is fitted with 3-wire grounding type plug designed to fit only into a
grounding type power outlet. If a special local plug must be fitted to the power cord
ensure this operation is performed by a skilled electronics technician and that the
protective ground connection is maintained. The plug that is cut off from the power cord
must be safely disposed of.
Power cord color codes are as follows:
Europe
brown live
blue neutral
green/yellow earth (ground)
United States
black live
white neutral
green ground
TONEOHM 550A OPERATOR MANUAL
iv
POWER SUPPLY
Check that the indicated line voltage setting corresponds with the local mains power
supply. See the rear panel for line voltage settings.
To change the line voltage settings refer the instrument to a skilled electronics
technician. Instructions for changing the line voltage settings are contained in the
TONEOHM 550A Service Manual published by Polar Instruments.
TONEOHM 550A OPERATION
This manual contains instructions and warnings which must be observed
by the user to ensure safe operation. Operating this instrument in ways
other than detailed in this manual may impair the protection provided by
the instrument and may result in the instrument becoming unsafe. Retain
these instructions for later use.
The TONEOHM 550A is designed for use indoors in an electrical workshop
environment at a stable work station comprising a bench or similar work surface.
Use only the accessories (e.g. test probes and clips) provided by Polar Instruments.
The TONEOHM 550A must be maintained and repaired by a skilled electronics
technician in accordance with the manufacturer’s instructions.
If it is likely that the protection has been impaired the instrument must be made
inoperative, secured against unintended operation and referred to qualified service
personnel. Protection may be impaired if, for example, the instrument:
•Shows signs of physical damage
•Fails to operate normally when the operating instructions are followed
•Has been stored for prolonged periods under unfavourable conditions
•Has been subjected to excessive transport stresses
•Has been exposed to rain or water or been subject to liquid spills
SAFETY
v
CAUTIONS
Electrical Isolation
The TONEOHM 550A must not be connected to a powered board. Make sure that the
item under test is isolated from all other sources of electrical power. External power
could damage the tester.
NOTE: The needle probes are manufactured from very hard steel to ensure that they
stay sharp. If they are used on anything other than PCBs or solder joints, take care not
to press them too hard or they may snap.
ENVIRONMENTAL OPERATING CONDITIONS
The instrument is designed for indoor use only under the following environmental
conditions:
Altitude Up to 2000m
Temperature +5°C to +40°C ambient
Relative humidity RH 80% maximum at 31°C — derate
linearly to 50% at 40°C
Mains borne transients As defined by Installation Category II
(Overvoltage Category II) in IEC664
Pollution Degree 2 (IEC664)
TONEOHM 550A OPERATOR MANUAL
vi
SPECIFICATIONS
Ranges
Number of Ranges 5
Hi sensitivity ΩApprox. 40mΩ, uncalibrated
200mΩ200mΩ, 4%
2Ω2Ω, 4%
200Ω200Ω, 4%
20kΩ20kΩ, 4%
Probe tip voltage 60mV max.
Probe Protection Momentary contact to 100V
Display 0.7”, 3½ digit Liquid Crystal Display
Tone Internal speaker, headphone socket,
adjustable volume
Power Cord Detachable
Power Requirements
230V ± 10%, 115V ± 10% or 100V ± 10% at 50/60Hz, 15VA.
Physical characteristics (excluding accessories)
Dimensions 300 mm (11.8 in.) wide
110 mm (4.4 in.) high
260 mm (10.3 in.) deep
Weight 1.5 kg (3.3 lb.)
SPECIFICATIONS
vii
ACCESSORIES
Standard Accessories
Probe set ACC152
Operator manual MAN149
SYMBOLS
CAUTION — To prevent damage to this product and to ensure its safe use
observe the specifications given in this manual when connecting to
terminals marked with this symbol.
TONEOHM 550A OPERATOR MANUAL
viii
CONTENTS
DECLARATIONS............................................................................................................. i
ELECTROMAGNETIC COMPATIBILITY......................................................................ii
European Community Directive Conformance Statement.........................................ii
SAFETY......................................................................................................................... iii
WARNING ...................................................................................................................iii
GROUNDING ..............................................................................................................iii
POWER SUPPLY........................................................................................................iv
TONEOHM 550A OPERATION...................................................................................iv
CAUTIONS...................................................................................................................v
ENVIRONMENTAL OPERATING CONDITIONS .........................................................v
SPECIFICATIONS..........................................................................................................vi
ACCESSORIES..........................................................................................................vii
Standard Accessories..............................................................................................vii
SYMBOLS ..................................................................................................................vii
SECTION 1 – INTRODUCTION................................................................................... 1-1
THE TONEOHM 550A SHORTS LOCATOR............................................................1-1
1-1 Introduction to the TONEOHM 550A...............................................................1-1
1-2 Areas of application.........................................................................................1-1
SECTION 2 – GENERAL DESCRIPTION ................................................................... 2-1
PRINCIPLES OF OPERATION ................................................................................ 2-1
2-1 Locating short circuits...................................................................................... 2-1
2-2 TONEOHM 550A stimulus features ................................................................2-2
2-3 Controls, connectors and probes .................................................................... 2-2
Controls........................................................................................................... 2-2
RESISTANCE range switches..................................................................... 2-2
VOLUME control..........................................................................................2-2
Audio tone output.........................................................................................2-2
Connectors...................................................................................................... 2-2
Headphone socket.......................................................................................2-2
Probes............................................................................................................. 2-3
Needle probes .............................................................................................2-3
2-4 Rear Panel controls and connectors............................................................... 2-3
SECTION 3 – INSTALLATION AND SET-UP ............................................................. 3-1
PREPARATION FOR USE....................................................................................... 3-1
3-1 Unpacking .......................................................................................................3-1
3-2 Connecting the TONEOHM 550A to a power supply ...................................... 3-1
Indice
