Top Tronic T4137 Instruction Manual
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Top Tronic T4137 Instruction Manual

Battery operated digital milli-ohmmeter
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BATTERY OPERATED
DIGITAL MILLI-OHMMETER
C
MICROPROCESSOR CONTROLLED
AC
AC
DC
DC
DIGITAL MILLIOHM METER
INSTRUCTION MANUAL
C
P
P
1
1
1
1
HOLD
HOLD
M A X
M A X
M I N
M I N
C
P
4-terminal = LED off
1
1
C
P
3-terminal = Led ON
1
1
Model :
P
P
2
2
MAX. DC20V
MAX. DC20V
AUTO-HOLD
Test Current
Hz
Hz
mV
mV
kMW
kMW
2000
kA
kA
200.0
ms
ms
20.00
2000m
200.0m
4/3 T
T4137
C
C
2
2
Range
1mA
2000
NO
10mA
200.0
TEST
20.00
10mA
R
100mA
2000m
100mA
200.0m
R
OFF
EnerSave™
TEST R
• Short Test duration if TEST
P
is depressed for less than
2Sec.
• Long Test Duration if TEST
is depressed for more than
3Sec.
ON
P
C

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  • Page 1 T4137 Model : BATTERY OPERATED DIGITAL MILLI-OHMMETER MAX. DC20V MAX. DC20V MICROPROCESSOR CONTROLLED AUTO-HOLD Test Current Range 2000 10mA 200.0 TEST 20.00 10mA HOLD HOLD M A X M A X M I N M I N 100mA 2000m 100mA 200.0m...

  • Page 2: Table Of Contents

    DESCRIPTION PAGE SAFETY RULES............ GENERAL DESCRIPTION........02-03 FRONT PANEL LAYOUT........PREPARATION FOR USE........PRELIMINARY CHECKS........PRECAUTIONS............. MEASURING............SIMPLIFIED MEASUREMENT......APPLICATIONS............. TEST LEADS............THERMAL EFFECTS..........FUSES REPLACEMENT........INPUT LIMITS & PROTECTIONS......SPECIFICATIONS..........SPARES & ACCESSORIES........LIMITED WARRANTY........... CLEANING & STORAGE........BATTERY & FUSE REPLACEMENT.....

  • Page 3: Safety Rules

    SAFETY RULES The meter has been designed with safety in mind. However, no design can completely protect against incorrect use. Electrical circuits are dangerous and lethal through lack of caution or poor safety practice. The following rules should reduce the danger •...

  • Page 4: General Description

    GENERAL DESCRIPTION The meter digital milli-ohmmeter is a battery operated instrument wich supply a low current to the circuit under test, with which, stable, accurate measurement of low resistance can be made, still, over a wide range of values. Resolution on the lowest range is 100µ ohm and on the highest range, 1 ohm.
  • Page 5 The meter has a built-in custom 3½ digit liquid crystal display can be viewed in most lightning conditions. This display indicates the diferentes conditions (Hold, m, buzzer, polarity condition of load, + or -, automatic decimal point change). The ranges are selected by a 5 position rotary switch, and a test is initiated by pressing the ON push-button.

  • Page 6: Front Panel Layout

    FRONT PANEL LAYOUT If NO TEST LED lit, the current source is stopped. Over Temperature indicator. Lit = Over-temperature. TEST Resistance between the current leads too high (fuse!). Resistance between the potential leads too high. Current Measurement Terminals Potential Measurement Terminals MAX.

  • Page 7: Preparation For Use

    PREPARATION FOR USE When unpacked, the tester should be inspected for any visible signs of damage, and the preliminary checks described in the user's manual should be performed to ensure that it is operating correctly. If there is any sign of damage, or if the instrument does not operate correctly, return it to your nearest supplier.

  • Page 8: Precautions

    PRECAUTIONS • Always ensure that the circuit to be measured is switched "OFF", isolated and completely de-energised before connecting the test Leads. • If it is probable that the instrument's protection has been impaired due to electrical, mechanical or environmental damage, it must not be used.

  • Page 9: Measuring

    MEASURING • Perform the preliminary checks before proceeding with measurement and ensure that the precautions listed are observed. • Connect the test leads (color coded) to the instrument as shown. • The current test leads must always be outside of the potential test leads.

  • Page 10: Simplified Measurement

    SIMPLIFIED MEASUREMENT The 4 wires measurement has many advantages. The errors due to the resistance of the test leads and the contacts as well as R and R are eliminated. However, in some cases, for example when using the high resistance range (2000 ohms) the four wires method is not necessary to still have a good percentage of accuracy (compared to the full scale).

  • Page 11: Applications

    APPLICATIONS The meter Digital milli-ohmmeter, with its measuring range of 100 µohms to 2000 ohms, is suitable for a wide range of applications such as • Measuring the winding resistance of electric motors, generators And transformers. • Bond testing in mines, aircraft, railways, ships, domestic and industrial wiring installations.

  • Page 12: Test Leads

    TEST LEADS The test leads supplied with the instrument are suitable for connecting to conductors up to 17mm in diameter or bus bars 17mm tick. There will be,instances where the item being measured require larger jaws, and the user is advised to make up his own leads. There will be occasions when longer leads are required due to the geometry of the item being tested.

  • Page 13: Thermal Effects

    THERMAL EFFECTS Temperature can have a significant effect on the performance of a digital milli-ohmmeter due to the temperature coefficient of the resistance under test and thermal EMF's across the dissimilar conductors. Most conductors have a large temperature coefficient of resistance. For example 0.4%/°C for copper.

  • Page 14: Fuses Replacement

    FUSES REPLACEMENT There are three fuses l Power Supply Fuse The power supply fuse is situated under the tester. Open the battery compartment, and replace the fuse with the same type (1.5A, >24V, Slow Blow) l Current Circuit Fuse Fuse protection is provided on the current terminals. This fuse is situated under the Printed Circuit Board.

  • Page 15: Input Limits & Protections

    INPUT LIMITS & PROTECTIONS The maximum continuous voltage which can be applied across the potential and current leads is around 10.7V. Applying more than that voltage will automatically blow their respective fuses. However, the crowbar trigger can be factory adjusted for your application.

  • Page 16: Specifications

    SPECIFICATIONS ELECTRICAL Measuring Ranges 0-200.0m ohms in steps of 100µ ohm 0-2000m ohms in steps of 1m ohm 0-20.00 ohms in steps of 10m ohm 0-200.0 ohms in steps of 100m ohm 0-2000 ohms in steps of 1 ohm Accuracy ±0.5% of reading ±2 digits over the Operating temperature range, -15°C to +55°C, with the supplied test leads.

  • Page 17: Spares & Accessories

    SPARES & ACCESSORIES At the date of printing this user's manual, accessories were not yet available. Please contact the factory for further information. Spares are available from your nearest distributor. LIMITED WARRANTY We warrant the product manufactured by us to be free from defective material or factory workmanship and agree to repair or replace this product which, under normal use and service, disclose the defect to be the fault of our manufacturing, with no charge for parts and service.

  • Page 18: Cleaning & Storage

    CLEANING & STORAGE Periodically wipe the case with a damp cloth and detergent do not use abrasives or solvents. If the meter is not to be used for periods of longer than 60 days, remove the batteries and store them separately. BATTERY &...
  • Page 19 CAT IV - Is for measurements performed at the source of the low- voltage installation. CAT III - Is for measurements performed in the building Installation CAT II - Is for measurements performed on circuits directly connected to the low-voltage installation. CAT I - Is for measurements performed on circuits not directly connected to mains.

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