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Table of Contents
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Summary of Contents for BK Precision 310
- Page 1 Instruction Manual Model 310 Digital Milli-Ohm Meter...
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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 ONE-YEAR WARRANTY ......CLEANING & STORAGE........BATTERY &... -
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.
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Page 6: Front Panel Layout
FRONT PANEL LAYOUT If NO TEST LED lit, the current source is stopped. Over Temperature indicator. Lit = Over-temperature or test TEST stopped. Resistance between the current leads too high (fuse!). Resistance between the potential leads too high. Current Injection Terminals Potential Injection Terminals... -
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 ONE-YEAR WARRANTY B&K Precision warrants to the original purchaser that its products and the component parts thereof, will be free from defects in workmanship and materials for a period of one year from date of purchase from an authorized B&K Precision... -
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: Service Information
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. - Page 20 B&K Precision 22820 Savi Ranch Parkway Yorba Linda, CA 92887 U.S.A. www.bkprecision.com Printed in Taiwan / Ver. 1.0/0307 © 2007 B&K Precision Corporation...
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