Velleman DCM266 User manual

DCM266
Digital Clamp meter
OPERATION MANUAL
GEBRUIKERSHANDLEIDING
MANUEL D’UTILISATEUR

DCM266 GB1
DCM266
Digital Clamp Multimeter
1. Safety Information
The meter is completely portable, LCD, 3 1/2 digit clamp with insulation test
function (with option 500V insulation tester unit). It has been designed
according to IEC-1010 concerning electronic measuring instruments with an
overvoltage category (CAT II) and pollution 2 and safety requirements for
handheld current clamps for electrical measurement and test.
Follow all safety and operating instructions to ensure that the meter is used
safely and is kept in good condition.
1.1 Preliminary
lWhen using this meter, the user must observe all normal safety rules
concerning :
- Protection against the dangers of electronic current.
- Protection of the meter against misuse.
lFull compliance with safety standards can be guaranteed only if used with
test leads supplied. If necessary, they must be replaced with the same
model or same electronic ratings. Measuring leads must be in good
condition.
1.2 During Use
lNever exceed the protection limit values indicated in specifications for
each range of measurement.
lWhen the meter is linked to measurement circuit, do not touch unused
terminals.
lWhen the value scale to be measured is unknown beforehand, set the range
selector at the highest position.
lBefore rotating the range selector to change function, disconnect test leads
from the circuit under test.
lWhen carrying out measurements on TV or switching power circuits,
always remember that there may be high amplitude voltage pulses at test
points which can damage the meter.
lNever perform resistance measurements on live circuits.
lAlways be careful when working with voltage above 60Vdc or 30Vac rms.

DCM266 GB2
lWhen the jaw are open and will be connected to the conductor under test,
your fingers must keep behind the barrier indicator.
lNever ground yourself when taking electrical measurements. Do not touch
exposed metal pipes, outlets, fixtures, etc. which might be at ground
potential. Keep your body isolated from ground by using dry clothing,
rubber shoes, or any approved insulating material.
1.3 Symbols
1.4 Maintenance
lBefore opening the meter, always disconnect test leads from all sources of
electric current.
lIf any faults or abnormalities are observed, the meter can not be used any
more and it has to be checked out.
lNever use the meter unless the back cover and the battery cover are in
place and fastened fully.
lDo not use abrasives or solvents on the meter, use a damp cloth and mild
detergent only.
Important safety information, refer to the operating manual
Dangerous voltage may be present
Earth ground
Double insulation (Protection class II)

DCM266 GB3
2. Description of the meter
This meter is a handheld 3 1/2 digital clamp meter for measuring DC and AC
voltage, AC current, resistance, continuity test and insulation test. Full overload
protection, low battery indication and over-range indication are provided.
Transformer jaws
óTrigger
ìData hold switch
öRotary switch
úLCD display
÷Input jacks
øDrop-proof wrist strap
íBarrier indicator

DCM266 GB4
2.1 Function and range selector
A rotary switch is used to measurement Functions and Ranges. When the
switch is set to OFF position, the meter does not operate.
2.2 Transformer jaws
Pick up the AC current flowing through the conductor. Press the TRIGGER
to open the transformer jaws. When the finger press on the TRIGGER is
released, the jaws will close again.
2.3 Data hold
A push switch (Push ON, Push OFF. All ACA, ACV, DCV ranges with this
feature)
2.4 Input jacks
This meter has three input jacks that are protected against overload to the
limits.
During use connect the black test lead to COM jack and connect red test
lead to V Ωjack. The red test lead is depended on function selected.
The EXT jack is used for accept insulation tester unit EXT banana plugs, when
measurement insulation resistance.

DCM266 GB5
3. Operating instruction
3.1 Measuring current
1. Set the rotary switch at desired AC range position. The transformer jaws
pick up the AC current flowing through the conductor.
2. When only the figure " 1" displayed, it indicates overrange situation and the
higher range has to be selected.
3.2 Insulation test
(Option 500V insulation tester unit (not available in France and Benelux market))
1. Connect the insulation test unit V Ω, COM, EXT three bananaplugs to the
clamp meter V Ω, COM, EXT.
2. Set the rotary switch of the clamp meter at 2000MΩposition.
3. Set the insulation tester unit range switch to the 2000MΩposition.
4. Use the insulation tester unit of the test leads connect its L, E input connect
to being tested installation’s. ( Test installation’s must be power OFF.)
5. Set the insulation tester power switch to the ON position.
6. Depress the PUSH 500V push-push switch, the 500V on red LED lamp will
light. Clamp meter display reading is the insulation resistance value. If the
reading is below 19MΩ, change clamp meter and insulation tester unit to
20MΩrange, can be increase the accuracy.
7. If the insulation tester unit is not used, the power switch must shift to power
OFF position, and the test leads must leave the E, L input connect. That can
be increase battery life and prevent electrical shock hazard.
Wrong Correct

DCM266 GB6
3.3 Measuring voltage
1. Connect the black test lead to the COM jack and the red test lead to the V Ω
jack.
2. Set the rotary switch at the desired DCV or ACV range position and connect
test leads across the source or load under measurement.
The polarity of the red lead connection will be indicated along with the
voltage value when making DC voltage measurement.
3. When only the figure " 1" is displayed, it indicates overrange situation and
the higher range has to be selected.
3.4 Measuring resistance
1. Connect the black test lead to the COM jack and the red test lead to the V Ω
jack.
2. Set the rotary switch at desired Ωposition and connect test leads across the
resistor under measurement.
NOTE :
1. If the resistance being measured exceeds the maximum value of the range
selected or the input is not connected, an overrange indication " 1" will be
displayed.
2. When checking in-circuit resistance, be sure the circuit under test has all
power removed and that all capacitors have been discharged fully.
3.5 Continuity test
1. Connect the black test lead to the COM jack and the red test lead to the V Ω
jack. ( The polarity of the red lead is positive " +")
2. Set the rotary switch at position and connect test leads across two points
of the circuit under testing. If continuitiy exists ( i.e., resistance less than
about 50Ω), built-in buzzer will sound.

DCM266 GB7
4. Specifications
Accuracy is specified for a period of one year after calibration and at 18°C
to 28°C (64°F to 82°F) with relative humidity to 80%.
4.1 General
DISPLAY 3 1/2 digit LCD, with automatic polarity
indication
MEASURING dual-slope integration A-D converter
system
OVERRANGE INDICATION "1" figure only in the display
MAXIMUM VOLTAGE BETWEEN
TERMINALS AND EARTH
GROUND CAT II 600V
OPERATING TEMPERATURE 0°C to 40°C (32°F to 104°F)
STORAGE ENVIRONMENT -10°C to 50°C (14°F to 122°F)
POWER SUPPLY 9V battery
ACCESSORIES operating manual, set of test leads
LOW BATTERY INDICATION " BAT " appears on the display
SIZE (H x W x L) 37 x 90 x 230 mm (1.46" x 3.54" x
9.06")
WEIGHT approx. 320g (including battery)
4.2 AC current
Range Resolution Accuracy Note
200A 100mA ±2.0% of rdg ± 5 digits
600A 1A ±2.0% of rdg ± 5 digits
Frequency Range : 50Hz to 60Hz
Response : Average, Calibrated in rms of sine wave
Overload protection : 1200A within 60 seconds. Jaw opening : 2" (5cm)

DCM266 GB8
4.3 Insulation test
With option 500V insulation tester unit.
Range Resolution Accuracy Note
20MΩ10KΩ±2.0% of (rdg-50) ± 2 digits
2000MΩ1MΩ±4.0% of (rdg-100) ± 2 digits ≤500MΩ
±5.0% of (rdg-100) ± 2 digits > 500MΩ
4.4 AC Voltage
Range Resolution Accuracy
600V 1V ±1.0% of rdg ± 4 digits
Input Impedance : ≥9MΩon all ranges
Overload protection : 600V peak or 600Vrms AC on all ranges
Frequency Range : 50Hz to 500Hz
Response : Average, calibrated in rms of sine wave
4.5 DC voltage
Range Resolution Accuracy
600V 1V ±0.8% of rdg ± 2 digits
Input impedance : >9MΩ
Over protection : 250Vrms AC for 200mV range
600V peak or 600V rms AC for other ranges

DCM266 GB9
4.6 Resistance
Range Resolution Accurcacy
200Ω0.1Ω±1.0% of rdg ± 3 digits
20KΩ10Ω±1.0% of rdg ± 1 digit
Overload protection : 250V dc or 250Vrms AC on all ranges
Open circuit voltage : 700mV
5. Accessories
Test leads
Battery
Operating manual
6. Battery replacement
If the sign "BAT" appears on the LCD display, it indicates that battery should
be replaced. Remove the battery cover of case. Replace the exhausted battery
with a new one.
WARNING
Before attempting to open the battery cover, be sure that test leads have been
disconnected from measurement circuit to avoid electric shock hazard.