B+K precision 310 User manual
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
C
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
P
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.
e
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 .
12
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
12
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.
RC
RP
NO
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
ON
2000
200.0
AUTO-HOLD
MICROPROCESSOR CONTROLLED
EnerSaveTM
TEST RP
Test Current Range
1mA
10mA
10mA
100mA
100mA
200.0
20.00
2000
2000m
200.0m
C1P1C2
P2
MAX. DC20V
HOLD
kA
DC
AC
ms
mV
Hz
kMW
MAX MIN
W
W
W
W
W
R
C
R
P
NO
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 .
12
•Select a range, and short the current test leads. The R led
C
should go off, indicating that the current regulation is ok.
Check the voltage measurement:
•Connect the potential leads to P and P .
12
•Short the P and P . The display should indicate 0000.
12
•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 ,
12
P , P . The display should indicate close to 0000 (depending of the
12
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-
RX
RB
RA
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
ON
2000
200.0
AUTO-HOLD
MICROPROCESSOR CONTROLLED
EnerSaveTM
TEST RP
Test Current Range
1mA
10mA
10mA
100mA
100mA
200.0
20.00
2000
2000m
200.0m
C1P1C2
P2
MAX. DC20V
HOLD
kA
DC
AC
ms
mV
Hz
kMW
MAX MIN
W
W
W
W
W
R
C
R
P
NO
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
B
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
11
be shorted as well as C and P .
22
-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
ON
2000
200.0
AUTO-HOLD
MICROPROCESSOR CONTROLLED
EnerSaveTM
TEST RP
Test Current Range
1mA
10mA
10mA
100mA
100mA
200.0
20.00
2000
2000m
200.0m
C1P1C2
P2
MAX. DC20V
HOLD
kA
DC
AC
ms
mV
Hz
kMW
MAX MIN
W
W
W
W
W
R
C
R
P
NO
TEST
RX
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