B+K precision 310 Manuale utente

Instruction Manual

Model 310 Digital Milli-Ohm Meter

DESCRIPTION PAGE

SAFETY RULES.................................................... 01

GENERAL DESCRIPTION.................................... 02-03

FRONT PANEL LAYOUT....................................... 04

PREPARATION FOR USE.................................... 05

PRELIMINARY CHECKS...................................... 05

PRECAUTIONS..................................................... 06

MEASURING......................................................... 07

SIMPLIFIED MEASUREMENT.............................. 08

APPLICATIONS..................................................... 09

TEST LEADS......................................................... 10

THERMAL EFFECTS............................................ 11

FUSES REPLACEMENT....................................... 12

INPUT LIMITS & PROTECTIONS......................... 13

SPECIFICATIONS................................................. 14

SPARES & ACCESSORIES.................................. 15

........................ 15

CLEANING & STORAGE...................................... 16

BATTERY & FUSE REPLACEMENT..................... 16

LIMITED ONE-YEAR WARRANTY

SERVICE INFORMATION.................................... 17

-1-

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

•Read the User's manual carefully and completely before using

the instrument. Fully understand the instructions before using

this product. Follow the instructions for every test. Take all the

necessary precautions. Do not exceed the limits of this

instrument.

•The circuit to be tested must be de-energised and isolated before

connections are made to it.

•Do not use test leads, probes or crocodiles/aligators clips that

are dirty, damaged or have broken or cracked insulation. Such

accessories should be removed and repaired Immediately.

•Always disconnect the test leads before replacing any fuse

Always replace the fuse with the type specified and ensure that

they are correctly fitted.

•Double check the switch settings and leads connections before

measuring. Make a sketch to ensure proper operation and

principle of measurement is correct and well understood.

•Do not touch any exposed wiring, connections or other "live"

parts of an electrical circuit. If in doubt, check the circuit first for

voltage before touching it.

•This instrument should only be used by a competent,

suitably trained person which understand fully this test &

measurement procedure.

Warning, risk of electric shock.

Caution, refer to this manual before using the Meter.

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.

The meter has 5 measuring ranges, from 200.0milli-ohm to 2000

ohms.

Measurements are displayed on a 3½digit custom liquid crystal

display with large digits.

This instrument is powered from batteries only ( alkaline or

rechargeable equivalent).

It has a regulated DC constant current source with current of 1mA

10mA and 100mA.

The instrument supply that current to the resistance being measured

through the C and C terminals (C being +, C being -).

1 2 1 2

The voltage drop across the resistance under test is measured by

the potential terminals P and P (P being +, P being -).

1 2 1 2

Should the current regulation drops out, the R Led will lit, indicating

that the resistance in the current circuit is too high. (Lowering the

current by selecting a higher resistance range can solve the

regulation.)

Should the R Led lit, that mean that the voltage measured on the

resistance is too high, and therefore over-range.

The resistance is measured precisely when the R and R Leds do

P C

not lit. If anyone of these leds lit, then the measurement can be

inaccurate.

-2-

-3-

The meter has a built-in custom 3½digit 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.

The instrument takes measurements for 10 seconds if the "ON"

"TEST r " presentative" button is depressed for less than 2 seconds.

If the same push button is pressed for more than 3 seconds, the test

will carry on for 60 seconds.

The tester switch "OFF" completely when the rotary switch is in the

"OFF" position.

The tester "Hold" the last reading before stopping the test.

The tester is fuse protected and has a crowbar between C and C .

This crowbar is activated by voltage. If the voltage is too high, that

crowbar will blow the fuse automatically to interrupt the circuit.

The voltage between P and P is also protected for over voltage but

does not have a fuse.

The tester has a temperature shut down. The temperature sensing

is done on the current regulation transistor.

Should this over-temperature let lit, allow the instrument to cool

down for a while before proceeding further.

TEST

FRONT PANEL LAYOUT

If NO TEST LED lit, the current source is stopped.

Over Temperature indicator. Lit = Over-temperature or test

stopped.

Resistance between the current leads too high (fuse!).

Resistance between the potential leads too high.

-4-

Potential Injection

Terminals

Current Injection

Terminals

Start/Stop Test

Current/Range Table

Liquid Crystal Display

Meet LVD & EMC

requirements

Rotary Selector Switch

DIGITAL MILLIOHM METER

ŸShort Test duration if TEST

is depressed for less than

2Sec.

ŸLong Test Duration if TEST

is depressed for more than

3Sec.

20.00

2000m

200.0m

OFF

2000

200.0

AUTO-HOLD

MICROPROCESSOR CONTROLLED

EnerSaveTM

TEST RP

Test Current Range

1mA

10mA

100mA

200.0

20.00

2000

2000m

200.0m

C1P1C2

MAX. DC20V

HOLD

kMW

MAX MIN

TEST

-5-

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.

PRELIMINARY CHECKS

Check the battery

•If the battery symbol is shown on the LCD, then replace the

batteries with new alkalines batteries before proceeding.

Check the current regulation:

•Connect the current leads to C and C .

•Select a range, and short the current test leads. The R led

should go off, indicating that the current regulation is ok.

Check the voltage measurement:

•Connect the potential leads to P and P .

•Short the P and P . The display should indicate 0000.

•Remove the short from P and P and C and C . Touching the

1212

potential test leads P to C and P to C , the R led should lit,

11 22 P

indicating an over-voltage or over-range.

This proving test can be repeated on all the ranges if need be.

You can also check the polarity indication of the milli-voltmeter by

touching the potential test leads P to C and P to C , the R led

12 21 P

should lit, indicating an over-voltage or over-range. The - indicator

should be indicating - on the LCD, showing the polarity change.

Total check can be done by shorting all the test leads together C , C ,

P , P . The display should indicate close to 0000 (depending of the

crocodiles clips used and how they are shorted). Both RC and RP

LED should be OFF, indicating that everything work ok.

-6-

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. It should be returned to your nearest

distributor or agent for checking and repair.

•To prevent damage to the liquid crystal display, the minimum

storage temperature of -20°C must be observed. It should also

be noted that below 0°C the operation of the LCD will be sluggish

•If the exterior of the instrument requires cleaning, it should be

done with a sponge and a mild solution of detergent and water.

•Other mechanical cleaning agents must not be used.

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.

•Please note that the shorter the potential test leads, the better

long potential test leads will pick up noise.

•Screened test leads are recommended for better environmental

noise rejection.

-7-

Compression

Joint

DIGITAL MILLIOHM METER

ŸShort Test duration if TEST

is depressed for less than

2Sec.

ŸLong Test Duration if TEST

is depressed for more than

3Sec.

20.00

2000m

200.0m

OFF

2000

200.0

AUTO-HOLD

MICROPROCESSOR CONTROLLED

EnerSaveTM

TEST RP

Test Current Range

1mA

10mA

100mA

200.0

20.00

2000

2000m

200.0m

C1P1C2

MAX. DC20V

HOLD

kMW

MAX MIN

TEST

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 RA

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). The simplified method of

two wires can be used without too much problems. C and P can

be shorted as well as C and P .

-8-

DIGITAL MILLIOHM METER

ŸShort Test duration if TEST

is depressed for less than

2Sec.

ŸLong Test Duration if TEST

is depressed for more than

3Sec.

20.00

2000m

200.0m

OFF

2000

200.0

AUTO-HOLD

MICROPROCESSOR CONTROLLED

EnerSaveTM

TEST RP

Test Current Range

1mA

10mA

100mA

200.0

20.00

2000

2000m

200.0m

C1P1C2

MAX. DC20V

HOLD

kMW

MAX MIN

TEST

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