Lumel np10 User manual

ANALOG -DIGITAL MULTIMETER
NP10
USER’S MANUAL

(10) (11)
(18)
(20)
(12)
(21)
(11)
(19)
(16)
(15)
(14)
(17)
(15)
(7)
230.0
50.00
00 10 20 30 40
30 50 60
Hz
V
AC
(1)
(4)
(2)
(8)
(3)
(9)
(6)
(5)
(13)
AUTO
1

(1) Liquid crystal display
(2) PMAX / PMIN push button
(3) Push button for MIN/MAX functions
(4) Pushbutton for manual range selection
(5) Multi function push button
(6) Function selector switch.
(7) Terminal sockets with automatic blocking system.
(8) Push button for HOLD function
(9) Push button for Back light function
(10)Main Display for digits, decimal point and polarity
(11)Display for manual range selection, Hold, MIN/MAX, Relative,
Peak functions.
(12)Over range indication
(13)Bar graph for analog indication
(14)Sub Display for digits, decimal point and polarity
(15)Display for the unit of measured quantity.
(16)Display for indication of Auto Off Function.
(17)Display for Diode testing
(18)Buzzer indication
(19)Display for hFE measurement
(20)Low battery indication
(21)Display for the selected function i.e. AC or DC
2

Contents Page
1. Introduction................................................................................4
2. Safety features and safety precautions......................................4
3. Switching the multimeter "ON"...................................................5
4. Function and range selection.....................................................6
4.1 Switching the measuring ranges.........................................6
4.2 Autoranging ........................................................................6
5. Liquid crystal display..................................................................7
5.1 Digital display .....................................................................7
5.2 Analog indication ................................................................8
5.3 Backlit .................................................................................8
6. Hold and Delay hold Feature.....................................................8
6.1 Hold feature .......................................................................8
6.2 Delay hold Feature..............................................................8
7. “MIN/MAX” feature.....................................................................8
8. Peak measurement....................................................................9
9. Voltage measurement................................................................9
10.Current measurement................................................................10
10.1 AC current measurement with (clip-on) current
transformers .....................................................................11
10.1.1 Transformer output mA/A................................................11
10.1.2 Transformer output V...................................................... 11
11. Resistance measurement.......................................................... 13
12.Continuity test and Diode test.................................................... 13
12.1 Continuity test.................................................................... 13
12.2 Diode test........................................................................... 13
13.Capacitance measurement (NP10-5, NP10-6).......................... 15
14. Frequency and Duty measurement(NP10-5, NP10-6).............. 16
14.1 Frequency measurement.................................................. 16
14.2 Duty cycle measurement.................................................. 16
15.Temperature measurement........................................................ 17
16.Specifications............................................................................. 18
17. Maintenance.............................................................................. 25
17.1 Battery............................................................................... 25
17.2 Fuses................................................................................ 26
17.3 Case.................................................................................. 26
18.Servicing.................................................................................... 26
3

1. Introduction
Thank you very much for selecting our multimeter. These multimeters
are manufactured as per IS 13875 and DIN 43751.
2. Safety features and safety precautions
you have chosen a multimeter which provides you a very high degree of
safety. The analog - digital Multimeters are manufactured and tested in
compliance with the safety standaed IEC 61010-1:2001/ DIN EN 61010
- 1:2001. In case of incorrect use or careless handling, the safety of both
user and multimeter is not assured.
For proper use and safe handling, it is absolutely necessary to read
and understand the operating instructions before using the meter.
For your safety and protection multimeters are fitted with an Automatic
terminal Blocking System (ABS). It is coupled with the function selector
switch which blocks the terminal sockets not necessary for
measurement.
Please note the following safety precautions
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Meaning of the symbols on the device
CAT II / III / IV
Warning of a danger point
(Attention, refer to the user manual)
Earth (ground) terminal.
Double or reinforced insulation
Instrument for over voltage
category II / III or IV
EU conformity mark.
Repair, replacement of parts:
When opening the meter, live parts may be exposed. Therefore, the
meter must be disconnected from the measuring circuit prior to opening
its case for repair or replacement of parts. If repair cannot be avoided
unless the meter is opened and live, this work must only be performed by
a qualified person who understands the danger involved.
Faults and abnormal stress:
When it is realised that the safe operation is no longer possible, take the
meter out of service and secure it against accidental use. Safe operation
may not be possible,
nWhen the meter shows obvious signs of damage,
nWhen the meter no longer functions correctly,
nAfter prolonged storage under adverse conditions,
nDue to severe stress during transportation.
nNot using in the manner described in this manual.
3. Switching the multimeter "ON”
Battery
our meter 2AA size batteries alkaline manganese cells per
IEC LR6. It is provided with meter. Before you use the meter for the first
time or after storage, refer to Section “17.1 Maintenance Battery”
Rotate the rotary knob (6). to other than “OFF” position to switch the
multimeter ON. Switch-“ON” is acknowledged by a sound signal. All
segments of the LCD will as shown on page 1.
Y works on
5

Note:
Electric discharges and high-frequency influence may cause incorrect
information to be displayed and block the measuring process. Reset the
meter by switching it OFF and ON again otherwise, check the battery
connections. Disconnect the meter from the measuring circuit before
you open it, and see section “17.Maintenance”)
Automatic Meter-OFF (MoFF)
DMM has a default auto meter off function. If the meter is idle for more
than 15 minuets ,the meter automatically turns the power off. When
MoFF happens, the state of the meter is saved. The “MoFF”(16) sign on
the LCD panel indicates whether the MoFF is enabled or not. In some
cases, user might want to disable this feature ,Power ON the meter by
pressing any of the push functions, except HOLD(8) & multifunction(5)
push buttons. After auto meter-off, pushing any of the push function or
changing the rotary switch mode can turn on the meter again. If the
meter is re-powered by changing the rotary mode, the saved state is
cleared. If the meter is re-powered by push functions, the chip
restores the saved state and enters HOLD mode. The LCD displays the
saved value.
Turning the multimeter OFF
To turn OFF the meter rotate the rotary knob(6) to the “OFF” position
4. Function and range selection
The function selector switch (6) is coupled with the Automatic terminal
Blocking System (ABS) which allows access only to two correct sockets
for each function. Prior to switching to the "mA" or "A" functions or from
the "mA" or "A" functions, remove the test lead from the corresponding
socket. When the test leads are plugged-in, the terminal blocking
systems prevents accidental switching to non permissible functions.
4.1 Switching the measuring ranges
The 660 mVAC and 660 mVDC measuring ranges are not automatically
selected when the meter is switched ON. The above ranges can only be
selected manually with “AUTO/MAN” key.
4.2 Auto / Manual ranging
The multimeter features auto ranging for all measuring ranges with the
00
exception of the C, F, continuity , Diode ,% , AAC ,ADC.
Autoranging is automatically selected after switching the multimeter
ON. According to the measured quantity applied, the multimeter
automatically selects the measuring range which gives the best
resolution. You can switch OFF auto-ranging and select the ranges
manually according to the table shown in this section. Manual mode is
6

Switching sequence at :
VDC 8 8
8 660mV 8 6.6V...
mAAC / mADC - 66mA 8 660 mA 8 66mA...
8 8 8 8
8 8
8 8 8 8
8 8 8 8
8 8 8 8
8 8 8
VAC / - 6.6V 8 66V 660V 1000V
W - 660W 6.6K W 66K W 660KW
6.6M W 66M W 660 ... W
F - 6.6nF 66nF 660nF 6.6mF 66 Fm
660 F m 6.6mF 40mF 6.6nF...
Hz - 66Hz 660Hz 6.6KHz 66KHz
660KHz 6.6MHz 10MHz 66Hz...
AUTO(11)
Long
ON
AUTO
MAN
(4)
Acknowl-
edgement
Display
switched OFF when push button AUTO/MAN is pressed (4) for
approximately 1s,or when the function selector switch (6) is operated, or
when the meter is turned OFF and ON again.
0
Note - C ,Continuity ,Diode ,AAC ,ADC ,% all functions have fixed range.
5. Liquid crystal display (LCD)
5.1 Digital display
The MAIN digital display (10) shows the measured value with correct
location of decimal point and sign. The selected measuring Unit (15) and
the function (21) are simultaneously displayed. When measuring DC
quantities, a minus sign appears in front of the digits, when the positive
pole of the measured quantity is applied to the “ ” input terminal.
When upper range limit 6600 ( on the range :1999), is exceeded
then "OL" is displayed.
The digital display is updated 2.8 times per second. The Sub digital
display (14) shows the measured value with correct location of decimal
point and sign. Main purpose of two digital display is to display
simultaneous measurement as mentioned below :-
Main Display Sub Display
Voltage Frequency
Voltage Min/Max
Frequency Duty cycle
Current Frequency
7

5.2. Analog indication
The analog indication with bar graph is updated 28 times per second.
Analog indication is of particular use when observing variations of
measured values. The analog bar graph (13) has its own polarity
indication in measuring DC quantities, when the positive pole of the
measured quantity is applied to the “ ” input terminal. Analog bar
graph has 65 scale divisions so that variations of the measured values
around "zero"can be observed exactly. The over range is indicated by
the right triangle (12) when measused value is > 6600 counts (for
measurement > 1999).
5.3. Backlit
The instrument is provided with user selectable Backlit for taking
measurements in poor lighting conditions/ dark areas.
Switching the Backlit ON
By pressing (9) key the Backlit can be switched ON for 60 Secs.
Switching the Backlit OFF
By pressing (9) key once again before 60 secs. the Backlit can be
switched OFF. Other wise it gets off automatically after 60 secs.
6. HOLD and Delay Hold feature
6.1 HOLD feature
After pressing “HOLD” (8) button meter stop updating the LCD panel.
After enabling HOLD function the meter switch to manual ranging mode
from AUTO mode, but the measuring range remains the same.
6.2 Delay Hold feature
Meter provides a Delay HOLD feature. To activate Delay HOLD feature,
press “ HOLD”(8) button for 2 seconds. The meter will wait for 6
seconds, then enters HOLD mode. In the 6 second period, the HOLD
symbol on LCD will blink and after 6 seconds meter will hold the
measured value present on LCD. To exit from delay HOLD function
either change range or press “AUTO/MAN”(4), or “HOLD”(8) button
again.
7. MIN/MAX feature
With the MIN/MAX function, you can hold the minimum and maximum
measured value which was applied to the input of the multimeter after
activating MIN/MAX function. The most important application is the
determination of the minimum and the maximum value for long-term
monitoring of measured parameters.
The actual measured value can still be noted/read during this feature.
8

Apply the measured quantity to the meter and select the measuring
range prior to activating the MIN/MAX function. With the function
activated, you can select the measuring ranges only manually, if you
switch to another range, the stored MIN/MAX values are cleared. After
Pressing MIN/MAX(3) for the first time, sub-display shows maximum
value. Sub-display shows minimum value, when it is pressed again.
Main-display always shows current value in MIN/MAX mode. To exit
from this mode press and held MIN/MAX(3) button for longer than one
second or when the function selector switch (6) is operated, or when the
meter is turned OFF and ON again. Pressing HOLD(8) in MIN/MAX
mode makes the meter stop updating the maximum or the minimum
value.
Note
MIN/MAX function is available in all the ranges of measurement except
in Hz.
8.Peak measurement
Multimeter 616 provides Peak hold function to capture the maximum or
minimum peak value. To enter peak mode, press PEAK(2) push button
for less than 1 second. A self-calibration process will execute
automatically before normal peak-hold operation. In peak mode, main-
display shows current value of signal, and sub-display shows PMAX or
PMIN value which is selected by PEAK key. After pressing PEAK(2)
push button for the first time, sub-display shows PMAX value. Sub-
display shows PMIN value, when PEAK(2) push button is pressed
again. To exit PEAK-hold function, press PEAK key more than 1 second
or when the function selector switch (6) is operated, or when the meter
is turned OFF and ON again.
9. Voltage measurement
According to the voltage to be measured, set the function selector
switch (6) to VAC or VDC. function selector switch (6) to VAC or VDC.
Connect the test leads as shown. The “ ” socket should be connected
to the lowest potential ground available. In VAC mode main display
always shows voltage and sub display shows frequency.
Note
The 660 mV measuring ranges can only be selected manually with the
“AUTO/MAN’’ (4) push button
Caution
Ensure current measuring range ( “mA’’ or “A’’) is not selected while
voltage measurement ! When the cut-out rating of the fuses is exceeded
because of incorrect operation, a dangerous situation exists!.
9

Voltage measurement
+(-)/~
-(+)/~
50.00
50.00
00 10 20 30 40
30 50 60
Hz
V
10. Current Measurement
nFirst disconnect the power supply to the circuit being measured
and/ or to the load, and discharge all capacitors within that circuit.
nWith the function selector switch (6), select A for currents >660mA
and mA for currents <=660 mA. When measuring current of
unknown magnitude, select the highest measuring range first.
nSelect the function corresponding to the measured quantity by
briefly pressing the yellow multi-function (5) push button.
nEach time the push button is pressed, alternate switching takes
place between DC and AC. The change-over is acknowledged by
a sound signal.
nThe symbols DC and AC (21)are displayed as per selected function
on the LCD.
nWhen selecting a range with the function selector switch (6), the DC
function is always set by default.
nConnect the multimeter in series with the load, as shown. Ensure
that the connections are tight (with least resistance).
Notes on Current measurement
nThe multimeter must be used only in the power systems, where the
current circuit is protected by a fuse or a circuit breaker of 20 A, and
when the nominal voltage of the system does not exceed1000V
AC/DC.
nMake the measuring circuit connections mechanically strong and
secure so that they do not accidentally open. The conductor cross
10

sections and connection points should be designed to avoid
excessive heating.
nThe current measuring ranges up to 660 mA are protected to a
short circuit current of 25 A by a fuse 1.6 A/1000V AC/DC in
conjunction, with power diodes. The cut-out capacity of the fuse is
10kA at a rated voltage of1000V AC/DC and ohmic load.
nThe 10 A current measuring ranges are protected by a 16A/ 1000V
AC/DC fuse. The cut-out capacity of the fuse is 30 kA at a normal
voltage of 1000V AC/DC and ohmic load.
nReplacement of the fuses is described in section “17. Maintenance’’.
Caution
The measuring ranges 16 A of Multimeter NP10-3 are not protected by a fuse!
10.1 AC current measurement with (clip-on) current transformer
10.1.1 Transformer output mA/A
Caution
If current transformers are operated with an open circuit on the
secondary side, e.g. due to defective or disconnected leads, a blown
fuse in the meter, or a wrong connection, dangerously high voltages can
occur at the connectors. Therefore, verify that the current circuit of the
multimeter and secondary winding of transformer connected to the
multimeter form an intact circuit. Connect the transformer to the sockets
and mA or A The maximum permissible operating voltage is the
nominal voltage of the current transformer. When reading the measured
value, take into account the transformer ratio and the additional error in
indication.
Transformer output Multimeter NP10-2
The multimeter NP10-2 shows the switching position and the
corresponding sockets. Connect to this socket a (clip-on) current
transformer with a transmission ratio of 1000:1 then the measured
values are displayed directly in the “A’’ range.
10.1.2 Transformer output V
Many transformers have voltage output (refered as mV/A) The
secondary output must therefore be connected to the connection
sockets “ ” and “ V ”.
11

Current measurement
AC current measurement with(clip-on)current transformers
...660 mA
+(-)/~
-(+)/~
660.0
50.00
00 10 20 30 40
30 50 60
Hz
mA
...10 A
+(-)/~
-(+)/~
9.00
50.00
00 10 20 30 40
30 50 60
Hz
A
~
A
mA
V
660.0
50.00
00 10 20 30 40
30 50 60
Hz
A
~
12

11. Resistance measurement
n
n
n
Verify that the device under test is electrically dead. External
voltages would falsify the measured result!
Set the function selector switch (6) to “ W ”.
Connect the device under test as shown.
Zero adjustment on the 660 W measuring range
When measuring small resistance values on the 660W range, you can
eliminate the resistance of the leads and contact resistance by REL
function.
nConnect the test leads to the multimeter and join the free ends.
nAlso “00.00” (+1digit) will displayed on main display & the
resistance measured at the instance the push buttons were pressed
is displayed on sub display & used as reference value.
nIt is automatically deducted from the values measured there after.
12. Continuity test and Diode test
nVerify that the device under test is electrically dead. External
voltages would falsify the measured results!
12.1 Continuity test
nSet the function selector switch (6) to “ W ” then press the yellow
multi-function push button (5).The multimeter acknowledges turn-
ON with a sound signal.
nAt the same time, (18) appears on the LCD & “OL” will
displayed on main display.
nThe sound signal is generated whenever the reading is less than
30W.
12.2 Diode test
nSet the function selector switch (6) to “ W ” then press the yellow
multi-function push button (5) twice. The multimeter acknowledges
turn-ON with a sound signal.
nAt the same time, (18) appears on the LCD & “OL” will
displayed on main display.
nThe multimeter displays the forward voltage in Volts.
13
The REL function can be cleared
n
By pressing and holding PEAK push button and then pressing AUTO/MAN
key. This is acknowledged by sound signals.
nBy switching the multimeter off.
nPress and hold PEAK(2) and press the AUTO/MAN(4) pushbutton.
The meter enter into the “REL” mode , “REL” symbol will displayed
on to the LCD.

nAs long as the voltage drop does not exceed the maximum display
value of 1.999V, you can also test several series-connected
elements or reference diodes with small reference voltage.
nReverse direction or open circuit: The multimeter indicates
overrange “OL”.
nWith the diode function selected, the meter emits a continuous
sound signal whenever the reading is less than 30mV.
Note
Resistors and semiconductor junction in parallel with the diode falsify
the measured results!
Changing over between Resistance ,continuity ,Diode Testing
Repeated brief pressing of the yellow multi-function switch (5) changes
the measuring functions in the following order:
Resistance Continuity Diode Resistance...
Resistance measurement
-
+
20.00
00 10 20 30 40
30 50 60
K
?
14

Continuity Test
-
+
00.00
00 10 20 30 40
30 50 60
?
-
0l.
?
30 40 30 50 60
00 10 20
DiodeTest
Forward direction Reverse direction
-
+
0l.
30 40 30 50 60
00 10 20
V
-
+
0.600
00 10 20 30 40
30 50 60
V
13. Capacitance measurement (Multimeter NP10-5, NP10-6 )
nVerify that the device under test is electrically dead. External
voltages would falsify the measured results!
nSet the function selector switch (6) to “ ”
nConnect the (discharged !) device under test to the “ ”and “ ’’
sockets via test lead.
15

Notes
nConnect polarized capacitors with the “ ” pole to the “ ” socket.
nResistors and semiconductor junctions in parallel with the capacitor
falsify the measured results!
Zero adjustment on the 6.600 nF measuring range
When measuring small capacitance values on the 6.600 nF range, the
internal resistance of the multimeter and the capacitance of the leads
can be eliminated by “REL” function.
nConnect the test leads to the meter without device under test.
nPress and hold PEAK(2) and press the AUTO/MAN(4) pushbutton.
The meter enter into the “REL” mode , “REL”symbol will be displayed
on to the LCD. Also “00.00” (+1digit) will displayed on main display
& the capacitance measured at the instant the push button is
pressed is displayed on sub display & used as reference value. It
is automatically deducted from the values measured there after.
The REL function can be cleared
n
By pressing and holding PEAK push button and then pressing AUTO/MAN
key. This is acknowledged by sound signals.
nBy switching the multimeter off.
14. Frequency and Duty measurement (Multimeter NP10-5, NP10-6)
14.1 Frequency measurement
nSet the function selector switch (6) to the “Hz”
nThe multimeter switches to frequency measurement. The frequency
is displayed on the main Display and duty cycle is displayed on to
the Sub display.
See section "16. Specifications" for the lowest measurable
frequencies and the maximum permissible voltages.
nConnections are made the same way as for voltage measurement.
14.2 Duty cycle measurement
With duty cycle measurement, it can determine the ratio of pulse duration
to cycle time of recurring square-wave signals.
nSet the function selector switch (6) to the “Hz”.
n
The multimeter switches to frequency measurement. The frequency is
displayed on the main Display and duty cycle is displayed on to the
Sub display.
nThe duty cycle-that is the percentage pulse duration of a signal-is
displayed on the LCD in %
nThat is: Duty cycle (%) =
Pulse duration
x 100
Cycle duration
16

Notes
nThe applied frequency must remain constant during the duty cycle
measurement.
15.Temperature measurement
The Multimeter NP10-2...NP10-6 allows you to measure temperature with K
00
type thermocouple in the range from 0 C...1300 C.
0
nSet the function selector switch (6) to “ C ”
nConnect the multimeter probe to the two unblocked terminals and
thermocouple output.
nThe multimeter measures temperature in C.
0
nTo measure temperature in F press the yellow multi-function
pushbutton (5) .
00
Changing over between C and F
Repeated brief pressing of the yellow multi-function switch (5) changes
000
the measuring functions in the following order: C F C....
Analog scale is disabled during Temperature measurement mode.
17
0

18
Meas.
Function
V(DC)
Measuring Resol
Range
660.0mV
6.600V
66.00V
660.0V
1000V
660.0mV
6.600V
66.00V
660.0V
1000V
V(AC)
66.00mA
660.0mA
10.00A
66.0mA
A(DC)
660.0mA
10.00A
A(AC)
660.0W
6.600KW
W
NP10-2 NP10-3 NP10-5 NP10-6
• • • •
• • • •
• • • •
• • • •
• • • •
• • • •
• • • •
• • • •
• •
16A
• •
• • • •
•
• •
•
• • • •
• • • •
>
C
(AC)
66.00A
660.0A
• • • •
• • • •
16A
•
• • • •
• • • •
1mV
10mV
100mV
1V
100mV
10 Am
100 Am
10mA
100mW
1W
100mA
1mV
10mV
100mV
1V
100m
V
10 Am
100 Am
10mA
10mA
ution
16. Specification
(TRMS)
•

19
Input
Impedance
Digital display
reference condition
+(...%rdg + ...digits)
Overload capacity 1)
Overload
Duration
Overload
Values
Inherent deviation at
11 M // <40pFW
10 M // <40pFW
10 M // <40pFW
10 M // <40pFW
>10 G // <40pFW
66.00mV
-3.3V
-1.08V
11 M // <40pFW
10 M // <40pFW
10 M // <40pFW
10 M // <40pFW
>10 G // <40pFW
Voltage Drop
66.00mV
10.00mV
66.00mV
66.00mV
10.00mV
66.00mV
66.00mV
No load Voltage
0.7 + 5
0.4 + 5
1.2 + 5
1.0 + 3
0.4 + 5
0.4 + 5
0.4 + 5
0.8 + 5
0.8 + 5
1.5 + 5
0.8 + 5
0.8 + 5
0.8 + 5
0.8 + 5
0.8 + 5
1.5 + 5
0.8 + 5
1000 V
DC
AC
eff / rms
Sine
wave
Cont.
0.7A
1.0 + 3
Cont.
Cont.
0.7A
0.7A
Cont.
-
6)
6)
Cont.
6)
6)