Velleman DCM267 User manual

DCM267
DIGITAL CLAMP METER
DIGITALE STROOMTANG
PINCE AMPEREMETRIQUE
DIGITALE STROMZANGE
User Manual
Gebruikershandleiding
Manuel d’utilisation
Gebrauchsanleitung

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DCM267 – DIGITAL CLAMP METER
1. Introduction
Thank you for buying the DCM267 ! This device enables the user to measure DC & AC
voltages, AC current, resistance, temperatures and frequency. You can also test diodes and
continuity.
2. Safety
The DCM267 has been designed in accordance with IEC1010-1 and IEC1010-2-032 concerning
safety requirements for electrical measuring instruments and hand-held current clamps with an
overvoltage category (CATII) and pollution 2.
Safety Symbols
The DCM267 complies with the requirements of the following EC-directives : 89/336/EEC
(concerning electromagnetic compatibility) and 73/23/EEC (concerning low voltage) as
amended by 93/68/EEC (concerning CE-labelling).
Radio interference or powerful electromagnetic fields in the vicinity of the equipment may
influence the measurements. Just like all other electrical measuring instruments, the DCM267
will respond to unwanted signals (e.g. transients) that may occur in the circuit being tested.
Exercise extreme caution when using this device and avoid misleading.
Safety Precautions
Respect the following safety instructions to ensure maximum personal safety and to keep the
device itself in good working order :
• Prior to use, the operator should always inspect the device and the test leads for damage.
Refrain from using the device if it is not in perfect working order (e.g. damaged housing,
broken test leads, malfunctioning display).
• Do not expose the instrument to direct sunlight, extreme temperatures or moisture.
• Never ground yourself when executing electrical measurements. Do not touch metal pipes,
outlets, fixtures, etc., which might be at ground potential. Protect yourself by wearing dry
Important information with reference to safety, consult the manual !
Dangerous voltage may be present
Earth ground
Double insulation (Protection class II)

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clothing and rubber-soled shoes. Put a rubber mat or approved insulating material under your
feet.
• Exercise extreme caution when working with voltages in excess of 60VDC or 30 Vrms AC.
Keep your fingers behind the probe barriers while using the device.
• Never use the device to measure voltages that (may) exceed the max. input value for a
particular function.
• Never touch wiring, connections or live circuits while the device is in use.
3. Maintenance
• Disconnect all test leads from energised circuits prior to opening the housing.
• Do not use the device unless the cover is in place and securely fastened.
• Do not apply abrasives or solvents to the meter. Use a damp cloth and a mild detergent for
cleaning purposes.
• Only qualified technicians should attempt to repair or calibrate this device.
• If you insist on calibrating the instrument yourself, you should only do so in the presence of a
qualified technician.
4. General Description
The DCM267 is a hand-held, battery-operated 3 ½ digital clamp meter for measuring DC and
AC voltages, AC current, resistance, frequency, temperature (°C & °F), diodes and continuity.
5. Description of the Front Panel
Jaws
They pick up the AC current flowing through the conductor.
Hold-button
Press this button to freeze the last reading and make the “H”-symbol appear on the display.
Press this button again to make the “H”-symbol disappear.
Function and Range Switch
Used to select functions and desired ranges as well as to (de)activate the meter.
Back light
Press the ( ) “LIGHT”-button to activate the back light for ±3 to 5 seconds.
Display
3 ½ digit LCD with 7 segments. Height : 18mm.
“VHz”-jack
This is the positive (+) input terminal for tension and frequency measurements. Connect the
red test lead to this input terminal.
“COM”-jack
This is the negative (-) input terminal for every type of measurement, with the exception of
current measurements. Connect the black test lead to this input terminal.
“Ω”-jack
This is the positive input terminal for resistance, diode and continuity measurements.
Connect the red test lead to this input terminal.
Temperature measuring socket
Connect a “K”-type thermocouple to this input terminal and contact the object to be measured
with the thermocouple.
Trigger
Press the lever to open the jaws. The jaws will close again when the lever is released.

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6. Operating Instructions
6.1.DC Voltage Measurements
1) Connect the red test lead to the “VHz”-jack and the black lead to the “COM”-jack.
2) Place the rotary switch in the desired V-position.
3) Connect the test leads to the source you wish to measure.
4) The voltage value and the polarity of the red test lead will appear on the display.
6.2.AC Voltage Measurements
1) Connect the red test lead to the “VHz”-jack and the black test lead to the “COM”-jack.
2) Place the rotary switch in the desired V~ position.
3) Connect the test leads to the source you wish to measure.
4) The voltage value will appear on the display.
6.3.AC Current Measurements
1) Place the rotary switch in the desired A~ position.
2) Press the trigger to open the jaws. Put one conductor between the jaws and let them close
again, making sure that the conductor is gripped firmly.
3) The current value will appear on the display.
6.4.Resistance Measurements
1) Connect the red test lead to the “Ω”-jack and the black test lead to the “COM”-jack. The
polarity of the red test lead is positive (+).
2) Use the rotary switch to select the desired “Ω”-range.
3) Connect the test leads to the resistor to be measured and read the value on the display.
4) Disconnect the resistance and discharge all capacitors before applying the test probes if the
resistance to be measured is connected to a circuit.
Remarks :
 The overrange indication (“1”) will appear on the display if the input is not connected or if the
resistance being measured exceeds the max. value of the selected range.
 Disconnect the circuit to be tested and make sure that all capacitors have been fully
discharged before measuring the in-circuit resistance.
 The meter may need a few seconds to produce a stable reading for resistance
measurements in excess of 1MΩ.
6.5.Temperature Measurements
1) Place the rotary switch in the °C- or °F-position. The current ambient temperature will now
appear on the display.
2) Connect the “K”-type thermocouple with the temperature measuring socket on the front panel
and touch the object in question with the thermocouple probe.
3) The temperature of the object appears on the display.

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WARNING
v Remove the thermocouple before selecting another function in order to avoid electroshocks.
v Disconnect the test leads from all measurement circuits prior to using the thermocouple.
v Do not use the test leads for voltage measurements unless the thermocouple has been
disconnected.
6.6.Frequency Measurements
1) Connect the red test lead to the “VHz”-jack and the black test lead to the “COM”-jack.
2) Place the rotary switch in the “Hz”-position.
3) Connect the test leads to the source to be measured.
NOTES :
v Do not apply more than 250Vrms to the input.
v Use shielded cable for measuring small signals when working in an environment with a lot of
radio interference.
6.7.Diode Measurements
1) Connect the red test lead to the “Ω”-jack and the black test lead to the “COM”-jack. The
polarity of the red test lead is positive (+).
2) Place the rotary switch in the -position.
3) Connect the red test lead to the anode and connect the black test lead to the cathode of the
diode to be tested.
4) The approximate forward voltage drop of the diode will be displayed. The figure “1” will be
displayed if the polarity is reversed.
6.8.Audible Continuity Test
1) Connect the red test lead to the “Ω”-jack and the black test lead to the “COM”-jack.
2) Place the range switch in the -position.
3) Connect the test leads to two points of the circuit to be tested. The built-in buzzer will sound if
continuity exists.
7. Specifications
Max. accuracy is achieved during a one-year period after calibration. Ideal circumstances
require an operating temperature of 18 to 28°C (64 to 82°F) and a max. relative humidity of
80%.
****** General Specifications
Max. voltage between CAT II 1000VDC or 750Vrms AC (sine wave)
terminals and earth ground
Display Max. reading is 1999
Reading Rate 2-3 readings/sec.
Polarity Indication “-“ is displayed to indicate negative polarity
Overrange Indication Only figure “1” is displayed
Jaw Opening 55mm (= max. size or Ø of the conductor)

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Power Supply 9V-battery (NEDA1604 or IEC6F22)
Battery-Low Indication The -symbol is displayed
Operating Temperature 0 to +40°C
Storage Temperature -10 to +50°C
Temperature Coefficient 0.1 x specified accuracy / °C (<18°C or > 28°C)
Max. Altitude 2000m above sea level
Dimensions 282mm (L) x 104mm (W) x 47mm (H)
Weight ±500g
7.1.DC Voltage
Range Resolution Accuracy
2V 1mV
20V 10mV
200V 0.1V
±0.5% of rdg ± 1 digit
1000V 1V ±1.0% of rdg ± 2 digits
Input impedance : 10MΩ.
7.2.AC Voltage
Range Resolution Accuracy
200V 0.1V
750V 1V
±1.0% of rdg ± 3 digits
Input impedance : 10MΩ
Response : average response, calibration in rms of a sine wave.
Frequency range: 40Hz – 400Hz
7.3.AC Current
Range Resolution Accuracy
200A 0.1A
1000A 1A
< 600A : ± 2.0% of rdg ± 5 digits
> 600A : ± 3.0% of rdg ± 5 digits
Overload protection: 1200A for 60 max. seconds.
Frequency range : 50Hz to 60Hz
7.4.Resistance
Range Resolution Accuracy
2000.1±1.0% of rdg ± 3 digits
20k10±1.5% of rdg ± 5 digits
2M1k±1.5% of rdg ± 5 digits
7.5.Temperature in C°
Range Resolution Testing Range Accuracy
0°C to 400°C ±1.0% of rdg ± 3 digits
0°C to 750°C 1°C 400°C to 750°C ±2.0% of rdg ± 1 digit

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7.6.Temperature Range in °F
Range Resolution Testing Range Accuracy
32°F to 752°F ±1.0% of rdg ± 3 digits
32°F to 1400°F 1°F 752°F to 1400°F ±2.0% of rdg ± 1 digit
7.7.Frequency
Range Resolution Accuracy
2KHz 1Hz ±2.0% of rdg ± 5 digits
20KHz 10Hz ±1.5% of rdg ± 5 digits
Max. input tension : 250VAC
7.8.Diode & Continuity
Range Description
Display reads approx. forward voltage drop of diode
Built-in buzzer sounds if continuity exists (< 30Ω)
8. Replacing the Battery
WARNING
Disconnect all test leads from the circuits to be measured before opening the battery
compartment. Only use the device if the cover is in place and the screws are tightened in order
to avoid electroshocks.
The -symbol is displayed if the battery needs to be replaced. Use the following procedure :
1. Disconnect the test leads from all live sources, switch off the device and remove the test
leads from the input terminals.
2. Use a screwdriver to remove the screw from the cover of the battery compartment and
remove the cover.
3. Remove the battery and replace it with a new 9V battery (NEDA1604 or IEC6F22).
4. Replace the cover and tighten the screw.
Remark : Respect all applicable laws when disposing of your old batteries.
9. Accessories
• User manual
• Set of test leads
• “K”-type thermocouple
• 9V battery (NEDA1604 or IEC6F22)
• Gift box