Velleman DVM66 User manual

DVM66
Dual Display
Digital Multimeter
OPERATION MANUAL
GEBRUIKERSHANDLEIDING
MANUEL D’UTILISATEUR
IEC-1010

VELLEMAN GB1
DVM66
Dual Display Digital Multimeter
1 Safety information
This multimeter has been designed according to IEC-1010 concerning electronic
measuring instruments with an over voltage category (CAT II) and pollution 2.
Follow all safety and operating instructions to ensure that the meter is used safely
and is kept in good operating condition.
1.1 Preliminary
•When using the meter, the user must observe all normal safety rules
concerning :
- Protection against the dangers of electrical current.
- Protection of the meter against misuse.
•Full 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 electric ratings. Measuring leads must be in good condition.
1.2 During use
•Never exceed the protection limit values indicated in specifications for each
range of measurement.
•When the meter is linked to a measurement circuit, do not touch unused
terminals.
•Components should not be connected to the hFE socket when measuring
voltages with test leads.
•Before rotating the range selector to change functions, disconnect test leads
from the circuit under test.
•When 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.

VELLEMAN GB2
•Never perform resistance measurements on live circuits.
•Never perform capacitance measurements unless the capacitor to be measured
has been discharged fully.
•Always be careful when working with voltages above 60V DC or 30 V AC
rms. Keep fingers behind the probe barriers while measuring.
1.3 Symbols
Important safety information, refer to the operating manual.
Dangerous voltage may be present.
Earth ground
Double insulation (Protection class II).
Indicates that the fuse must be replaced with one having the ratings indicated.
1.4 Maintenance
•Before opening the meter, always disconnect test leads from all sources of
electric current.
•For continue protection against fire, replace fuse only with the specified
voltage and current ratings :
F1 : F 500mA/250V F2 : F 10A/250V
•If any faults or abnormalities are observed, the meter can not be used any
more and it has to be checked out.
•Never use the meter unless the back cover is in place and fastened fully.
•To clean the meter, use a damp cloth and mild detergent only, do not use
abrasives or solvents on it.

VELLEMAN GB3
2. Description
This meter is an auto ranging professional measuring instrument with 3 ¾ digit
LCD, capable of performing functions :
- DC and AC voltage measurement - DC and AC current measurement
- Resistance measurement - Capacitance measurement
- Frequency measurement - Transistor and Diode test
- Audible continuity test
Some special functions and features are provided. They are very useful for
electrical and electronic measurement.
All the functions are designed to be very convenient to use. You can get used to
working with this meter quickly.
2.1 Panel configuration
LCD Display
ôFunction buttons
o Record o Rel o Range
o A-H o AC-DC/
o Hz/∆%
íRotary Switch
÷V/Ω/F Input Jack
ûCOM Input Jack
ømA input Jack
ù10A Input Jack

VELLEMAN GB4
Following table shows the button configuration for all function positions.
Function ACV DCV ΩhFE CAP FREQ mA A
Range A/M A/M A/M M F F A/M A F F
Record o o o o o o o
Rel ooo ooo oo
A-H ##oooo
##oo
AC-DC o o
o
Hz o
∆% ooo ooo oo
A/M: Auto and manual ranging provided. M: Manual ranging only F: Range fixed.
#: A-H function is not valid for 200mV range.
##: A-H function in Freq. Measuring is different from normal. See paragraph 2.5.
2.2 Record button
•Push this button to enter into
Record mode.
-MIN MAX AVG signs light
- Main display shows the real
time measuring value.
- Secondary display shows the
recording time. At the first
minute display shows seconds
and then only minutes and
hours.
- This meter starts to record the
max. and min. value measured
and calculate the average
automatically.

VELLEMAN GB5
•To read out recorded value, push this button more.
-MAX MIN AVG lights in sequence
- Main display shows the recorded value or the average.
- Secondary display shows the time when the max. value or the min. value was
recorded.
•Hold this button for more than 3 seconds to return to the normal operating
mode.
2.3 Rel button
•Push this button to enter into
Rel measuring mode.
-REL sign lights.
- Main display shows the relative
value.
Relative value = Real time value
- Reference value.
- Secondary display shows the
reference value.
•Push this button again to get Rel
% measurement.
-REL % signs light.
- Main display shows the relative
percent value.
Relative percent value = Rel.
Value/reference x 100 %
- Secondary display remains the
reference value.
- Bargraph shows the percentage
tolerance specified.
•If measurement result is within
the tolerance range, built-in
buzzer will sound.

VELLEMAN GB6
•To change the percentage
tolerance, use ∆% button. Per
pushing increases 0.5% until
10%. The bar graph consists of
12 bars in this case. One bar of
the 2nd to 11th indicates 1% and
the 13th indicates 0.5%. For
example, right figure indicates
5.5% tolerance.
•Hold this button for more than 3
seconds to exit.
2.4 Range Button
•Range button is used to change ranging mode between Auto and Manual.
When a function with A/M ranging mode is selected, the meter enters auto
ranging at first. To change to manual ranging, push this button once.
•When the meter operates in manual ranging mode, push this button to change
range to the higher one and hold this button for more than 3 seconds to return
to auto ranging mode.
2.5 A-H Button
•Auto data hold is a very useful function for real time measurement. Just push
A-H button to hold the last measuring result. When a new measurement is
made, the meter will hold the new value automatically. This function remains
valid until pushing the A-H button to release the meter.
•New value mentioned above means a value much different from the old. In
most of measurements with this meter, 10 digit difference is enough. But in
resistance measuring, maybe less than 20 digits will not result in a new
holding.

VELLEMAN GB7
•In frequency measurement, the A-H feature is somehow different. Pushing
this button only freezes the operation of meter, but does not auto-hold
reading. It means that LCD display will keep the value not variant, even
though the frequency of input changes greatly. In this case, the sign A-H is
flashing to show the functional difference.
•In high resistance and large capacitance measuring, as the meter has to take
time to get stable reading, so some transient changes of inputs do not affect
the held value.
2.6 AC-DC/ Button
•This button is used to change current measurement between AC and DC
mode.
•The second function of this button is to set up a continuity testing mode in
resistance measurement position. A special feature provided by this meter is
that the continuity testing can be executed at any resistance ranges. To make
continuity testing at the desired range, just use the range button after pushing
button.
2.7 Hz/ ∆% BUTTON
•When measuring frequency, push this button will change the contents of LCD
display. The main display will show the AC voltage value of input signals.
At the same time, the frequency of inputs will appear on the secondary
display.
•In relative value measurement mode, this button is used to specify the
percentage tolerance as described in paragraph 2.3.

VELLEMAN GB8
2.8 Input Jacks
This meter has four input jacks that are protected against overload to the limits
shown in the table. During use, connect the black test lead to the COM jack and
the red test lead as below :
Function Red Lead Connection Input Limits
DCV/ACV V/Ω/F 1000V DC or 750V rms AC
Ω/ / V/Ω/F 250V DC or rms AC
CAP. V/Ω/F 250V DC or rms AC
FREQ. V/Ω/F 250V DC or rms AC
mA mA 400mA DC or rms AC
A A 10A DC or rms AC
mA and A ranges are protected by fuses
3. Operating Instruction
3.1 Measuring voltage
1. Connect the black test lead to the COM jack and the red test lead to the V/Ω/F
jack.
2. Set the function switch at V or V range to be used and connect test leads
across the source or load under measurement.
3. Read LCD display. The polarity of red connection will be indicated when
making a DC measurement.
3.2 Measuring current
1. Connect the black test lead to the COM jack and the red test lead to the mA jack for
a maximum of 400mA. For a maximum of 10A, move the red lead to the A jack.
2. Set the function switch at mA or A range to be used and push AC-DC button
to select DCA or ACA measuring mode.
3. Connect test leads in series with the load in which the current is to be
measured.
4. Read LCD display. The polarity of red lead connection will be indicated
when making a DC measurement.

VELLEMAN GB9
3.3 Measuring Resistance
1. Connect the black test lead to the COM jack and the red teas lead to the
V/Ω/F jack. (NOTE : The polarity of the red lead connection is positive “+”)
2. Set the function switch at Ωrange to be used and connect test leads across the
resistance under measurement.
NOTE :
1. For resistance above 4MΩ, the meter may take a few seconds to stabilize
reading. This is normal for high resistance measuring.
2. When the input is not connected, i.e. at open circuit, the figure “OL” will be
displayed for the over range condition.
3. When checking in-circuit resistance, be sure the circuit under test has all
power removed and all capacitors are fully discharged.
3.4 Measuring Capacitance
1. Connect the black test lead to the COM jack and the red test lead to the V/Ω/F
jack. (NOTE: The polarity of the red lead connection is positive "+").
2. Set the function switch at position.
3. Connect test leads across the capacitor under measurement and be sure that
the polarity of connection is observed.
4. When rest leads are not connected to a capacitor, the LCD may not show zero
but a few digits, this is normal for the stray capacitance of test leads and input
circuit of the meter always exists. These digits can be deleted by using Rel.
Operating mode before applying test leads.
3.5 Measuring Frequency
1. Connect the black test lead to the COM jack and the red test lead to the V/Ω/F
jack.
2. Set the function switch at the FREQ. Position and connect test leads across
the source or load under measurement.
NOTE :
The input voltage should be between 1V and 10V rms ac. If the voltage is
more than 10V rms, reading may be out of the accuracy range.