NTL P3250-1M User manual

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P3250-1M
Multimeter digital “BT”, True RMS
User Manual
July 2019 edition V1.0.3
Copyright © by Fruhmann GmbH, Austria. All rights reserved.
The information in this manual was correct at the time of printing. However, Fruhmann GmbH
will continue to improve products and reserves the rights to change specification at any time
without notice.
is the registered trademark of the Fruhmann GmbH in Austria.
Fruhmann GmbH, NTL Manufacturer & Wholesaler
Katharinenweg 3
7372 Karl
Austria
Tel: [phone] Fax: [phone]
Web: www.ntl.at E-mail: [email protected]

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General Warranty
NTL warrants that the product will be free from defects in materials and workmanship for a
period of 2 years from the date of purchase of the product. This warranty only applies to the
original purchaser and is not transferable to the third party, and does not apply to fuses,
disposable batteries or to any product which has been misused, altered, neglected or damaged
by accident or abnormal conditions of operation or handling.
If the product proves defective during the warranty period, NTL either will repair the defective
product without charge for parts and labour, or will provide a replacement in exchange for the
defective product. Parts, modules and replacement products used by NTL for warranty work may
be new or reconditioned like new performance.
In order to obtain service under this warranty, the Customer must notify NTL of the defect before
the expiration of the warranty period. The Customer shall be responsible for packaging and
shipping the defective product to the service center designated by NTL, and with a copy of
customer proof of purchase.
This warranty shall not apply to any defect, failure or damage caused by improper use or
improper or inadequate maintenance and care. NTL shall not be obligated to furnish service
under this warranty
a) to repair damage resulting from attempts by personnel other than NTL representatives to
install, repair or service the product;
b) to repair damage resulting from improper use or connection to incompatible equipment;
c) to repair any damage or malfunction caused by the use of non-NTL supplies; or
d) to service a product that has been modified or integrated with other products when the effect
of such modification or integration increases the time or difficulty of servicing the product.
Please contact the nearest NTL Partner or Service Office for services or a complete copy of the
warranty statement.
Excepting the after-sales services provided in this summary or the applicable warranty
statements, NTL will not offer any guarantee for maintenance definitely declared or hinted,
including but not limited to the implied guarantee for marketability and special-purpose
acceptability. NTL should not take any responsibilities for any indirect, special or consequent
damages.
This user manual can be downloaded with its item number at www.ntl.at

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Table of Contents
1.Safety Information....................................................................................................1
Safety Considerations ......................................................................................................... 1
Measurement Category ...................................................................................................... 3
Safety Terms and Symbols .................................................................................................. 4
2.Quick Start................................................................................................................5
General Inspection.............................................................................................................. 5
Install/change the Battery................................................................................................... 6
Adjusting the Tilt Stand....................................................................................................... 7
Power On/Off..................................................................................................................... 7
Sleep Mode ........................................................................................................................ 7
LCD Backlight and Flashlight................................................................................................ 8
Selecting the Range ............................................................................................................ 8
Multimeter in Brief ............................................................................................................. 9
Front panel ............................................................................................................................................... 9
Rotary switch.......................................................................................................................................... 10
Keypad.................................................................................................................................................... 11
Display screen......................................................................................................................................... 12
Input terminals ....................................................................................................................................... 13

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3.Making Measurements............................................................................................15
Measuring AC or DC Voltage ..............................................................................................15
Measuring Resistance ........................................................................................................15
Testing for Continuity ........................................................................................................16
Testing Diodes ...................................................................................................................16
Measuring Capacitance......................................................................................................16
Measuring Frequency ........................................................................................................17
Measuring Temperature ....................................................................................................17
Non-Contact Voltage Detect (NCV) .....................................................................................17
Measuring DC or AC Current...............................................................................................18
4.Multimeter Features................................................................................................19
Data Hold Mode ................................................................................................................19
Making Relative Measurements.........................................................................................19
Buzzer Feature...................................................................................................................19
5.To Connect with Mobile Device...............................................................................20
Android App ......................................................................................................................22
How to Connect with Android Device .................................................................................................... 22
User Interface in Android App................................................................................................................ 23
Operations in Android App..................................................................................................................... 24
Multimeter Offline Record (Android)..................................................................................................... 28
iOS App .............................................................................................................................30
How to Connect with iOS Device............................................................................................................ 30
User Interface in iOS App ....................................................................................................................... 31
Operations in iOS App ............................................................................................................................ 33
Multimeter Offline Record (iOS) ............................................................................................................ 35
6.To Connect with Computer......................................................................................37
How to Connect with Computer ............................................................................................................ 37
Step 1: Install multimeterBLE software...............................................................................................................37
Step 2: Install driver of Bluetooth USB adapter ..................................................................................................37
Step 3: Connect to multimeterBLE software.......................................................................................................43
User Interface in MultimeterBLE Software ............................................................................................ 45
Operations in MultimeterBLE Software ................................................................................................. 46
Multimeter Offline Record (PC Software) .............................................................................................. 47

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7.Technical Specifications..........................................................................................49
8.Appendix.................................................................................................................51
Appendix A: Enclosure .......................................................................................................51
Appendix B: General Care and Cleaning..............................................................................51
Appendix C: Changing the fuse ...........................................................................................52

P3250-1M Multimeter digital “BT”, True RMS
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1. Safety Information
Safety Considerations
Before any operations, please read the following safety precautions to avoid any
possible bodily injury and prevent damage to this product or any other products
connected. To avoid any contingent danger, use this product only as specified.
EC Declaration of Conformity:
Meets intent of Directive 2004/108/EC for Electromagnetic Compatibility.
 Limit operation to the specified measurement category, voltage, or amperage
ratings.
 Do not use the multimeter if it is damaged. Before you use the multimeter, inspect
the case. Look for cracks or missing plastic. Pay particular attention to the insulation
surrounding the connectors.
 Inspect the test leads for damaged insulation or exposed metal.
 Before use, verify the multimeter's operation by measuring a known voltage.
 Only the qualified technicians can implement the maintenance.
 Always use the specified battery type. The power for the multimeter is supplied
with a battery. Observe the correct polarity markings before you insert the battery
to ensure proper insertion of the battery in the multimeter.
 Check all Terminal Ratings. To avoid fire or shock hazard, check all ratings and
markers of this product. Refer to the user's manual for more information about
ratings before connecting to the multimeter.
 Do not operate the multimeter with the cover or portions of the cover removed or
loosened.
 Use Proper Fuse. Use only the specified type and rating fuse for the multimeter.
 Do not operate if in any doubt. If you suspect damage occurs to the multimeter,
have it inspected by qualified service personnel before further operations.
 To avoid electric shock, do not operate this product in wet or damp conditions.
 Do not operate in an explosive atmosphere.
 Keep product surfaces clean and dry.
 Do not apply more than the rated voltage (as marked on the multimeter) between
terminals, or between terminal and earth ground.
 When measuring current, turn off the circuit power before connecting the
multimeter in the circuit. Remember to place the multimeter in series with the
circuit.

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 When servicing the multimeter, use only the specified replacement parts.
 Use caution when working above 60 V DC, 30 V AC RMS, or 42.4 V peak. Such
voltages pose a shock hazard.
 When using the test leads, keep your fingers behind the finger guards on the test
leads.
 Remove the test leads from the multimeter before you open the battery cover.
 To avoid false readings, which may lead to possible electric shock or personal injury,
replace the battery as soon as the low battery indicator appears and flashes.
 Disconnect circuit power and discharge all high-voltage capacitors before testing
resistance, continuity, diodes, or capacitance.
 Use the proper terminals, function, and range for your measurements. When the
range of the value to be measured is unknown, set the rotary switch position as the
highest range, or choose the auto ranging mode. To avoid damages to the
multimeter, do not exceed the maximum limits of the input values shown in the
technical specification tables.
 Connect the common test lead before you connect the live test lead. When you
disconnect the leads, disconnect the live test lead first.
 Before changing functions, disconnect the test leads from the circuit under test.

P3250-1M Multimeter digital “BT”, True RMS
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Measurement Category
The multimeter has a safety rating of 1000 V, CAT III and 600 V, CAT IV.
Measurement category definition
Measurement CAT I applies to measurements performed on circuits not directly
connected to the AC mains. Examples are measurements on circuits not derived from the
AC mains and specially protected (internal) mains- derived circuits.
Measurement CAT II applies to protect against transients from energy-consuming
equipment supplied from the fixed installation, such as TVs, PCs, portable tools, and
other household circuits.
Measurement CAT III applies to protect against transients in equipment in fixed
equipment installations, such as distribution panels, feeders and short branch circuits,
and lighting systems in large buildings.
Measurement CAT IV applies to measurements performed at the source of the low-
voltage installation. Examples are electricity meters and measurements on primary over
current protection devices and ripple control units.

P3250-1M Multimeter digital “BT”, True RMS
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Safety Terms and Symbols
Safety Terms
Terms in this Manual. The following terms may appear in this manual:
Warning: Warning indicates the conditions or practices
that could result in personal injury or death.
Caution: Caution indicates the conditions or practices
that could result in damage to this product or other property.
Terms on the Product. The following terms may appear on this product:
Danger: It indicates an injury or hazard may immediately happen.
Warning: It indicates an injury or hazard may be accessible potentially.
Caution: It indicates a potential damage to the instrument or other property might occur.
Safety Symbols
Symbols on the Product. The following symbol may appear on the product:
Direct current (DC)
Fuse
Alternating current (AC)
Caution, risk of danger (refer to
this manual for specific Warning
or Caution information)
Both direct and alternating
current
Category II overvoltage
protection
Ground terminal
Category III overvoltage
protection
Conforms to European Union
directives
Category IV overvoltage
protection
Equipment protected
throughout by double
insulation or reinforced
insulation

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2. Quick Start
General Inspection
After you get a new multimeter, make a check on the instrument according to the
following steps:
1. Check whether there is any damage caused by transportation.
If it is found that the packaging carton or the foamed plastic protection cushion has
suffered serious damage, do not throw it away first till the complete device and its
accessories succeed in the electrical and mechanical property tests.
2. Check the Accessories
The supplied accessories are described in the Appendix A: Enclosure (page 51) of this
Manual. You can check whether there is any loss of accessories with reference to
this description. If it is found that there is any accessory lost or damaged, please get
in touch with the distributor of NTL responsible for this service.
3. Check the Complete Instrument
If it is found that there is damage to the appearance of the instrument, or the
instrument does not work normally, or fails in the performance test, please get in
touch with the NTL distributor responsible for your area. If there is damage to the
instrument caused by the transportation, please keep the package. Immediately
inform the supplier (NTL distributor). A repairing or replacement of the instrument
will be arranged.

P3250-1M Multimeter digital “BT”, True RMS
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Install/Change the Battery
The multimeter is powered by a 9V (6F22) battery.
Warning: To avoid false readings, which could lead to possible electric shock or
personal injury, replace the battery as soon as the low battery indicator
appears. Use only the specified battery type.
Use the following procedure to install or change the battery:
(1) Ensure that the rotary switch is at the position.
Remove test leads and any connectors from the input
terminals.
(2) Turn the device, to see the reverse side.
(3) Loosen the screw with the included screwdriver and
remove the battery cover.
(4) Observe the battery polarity indicated inside the battery
compartment, and insert the battery. Change it only
through the same type/build.
(5) Place the battery cover back in its original position and
tighten carefully the screw.
Caution: To avoid instruments being damaged from battery leakage, always
remove the battery and store it separately if the multimeter is not going
to be used for a long period.

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Adjusting the Tilt Stand
Pull the tilt stand outward to its maximum reach (about 70° to the meter body).
Power On/Off
(1) To power ON the multimeter, turn the rotary switch to any other position except
.
(2) To power OFF the multimeter, turn the rotary switch to the position.
Sleep Mode
The multimeter automatically enters the sleep mode if the rotary switch is not moved or
a key is not pressed for 30 minutes.
(When the Bluetooth is activated, this function is disabled!)
Pressing or turn the rotary switch will turn the multimeter back to operation
mode from the sleep mode.
One minute before Auto Power-off, the buzzer will beep five times to warn. Before
shutoff, the buzzer will emit a long beep, and then the multimeter will shut off.
Note: In sleep mode, the multimeter will still consume a little power. If the multimeter is
not going to be used for a long period, the power should be turned off.

P3250-1M Multimeter digital “BT”, True RMS
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LCD Backlight and Flashlight
To implement the test among darkness, you can activate the LCD backlight and flashlight
by pressing for more than 2 seconds. The backlight and flashlight will last for one
minute. To turn off manually, pressing for more than 2 seconds.
Selecting the Range
 Auto ranging is set as default when the meter is powered on, is displayed.
 When auto ranging is enabled, press to enter the manual range mode.
 In manual range, each additional press of sets the multimeter to the next
higher range, unless it is already in the highest range, at which point the range
switches to the lowest range.
 When manual range is enabled, press for more than 2 seconds to enter the
auto ranging mode.
Note: Manual range is not available when measuring capacitance.

P3250-1M Multimeter digital “BT”, True RMS
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Multimeter in Brief
Front panel
Figure 2-1 Front panel overview

P3250-1M Multimeter digital “BT”, True RMS
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No.
Description
Details
①
Display screen
Page 12
②
Keypad
Page 11
③
Rotary switch
Page 10
④
Input terminals
Page 13
⑤
LED indicator
⑥
Non-contact voltage detector (NCV)
Page 17
⑦
Flashlight
Page 8
Rotary switch
Position
Description
Details
Power off
Page 7
DC or AC voltage measurement
Page 15
*
DC or AC voltage measurement
(up to 600 millivolts)
Resistance measurement
Page 15
Continuity test
Page 16
Diode test
Page 16
Capacitance measurement
Page 16
Frequency measurement
Page 17
Temperature measurement
Page 17
Non-contact voltage detect
Page 17
DC or AC current measurement
(up to 600 microamperes)
Page 18
DC or AC current measurement
(up to 600 milliamperes)
DC or AC current measurement

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Keypad
Key
Description
Details
Select DC or AC
Select Resistance/Continuity /Diode
Auto/Manual range
Page 8
Backlight & Flashlight
Page 8
Data Hold
Page 19
Select frequency/duty cycle
Page 17
Measuring frequency in AC voltage/current mode
Relative Measurements
Page 19
Bluetooth
Page 20

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Display screen
Figure 2-2 Display screen
Symbol
Description
Details
Bluetooth enabled
Page 20
Auto range
Page 8
Data hold enabled
Page 19
Relative enabled
Page 19
Diode test selected
Page 16
Continuity test selected
Page 16
DC
Page 15, 18
Page 15, 18
AC
Battery is low
Page 6
Measurement display
("OL" is short for overload, indicates the reading
exceeds the display range)
Non-contact Voltage Detect
Page 17
Measuring units
Page 13

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Measurement units
Sign
Description
M
Mega
1E+06 (1 000 000)
k
kilo
1E+03 (1 000)
m
milli
1E–03 (0.001)

micro
1E–06 (0.000 001)
n
nano
1E–09 (0.000 000 001)
Sign
Description
Measurement type
℃
Degree Celsius
Temperature
℉
Degree Fahrenheit
V
Volt
Voltage
A
Ampere
Current

Ohm
Resistance
Hz
Hertz
Frequency
%
Percent
Duty cycle
F
Farad
Capacitance
Input terminals
The terminal connections for the different measurement functions of the multimeter are
described in the table below.
Warning: Before starting any measurement, observe the rotary switch
position of the multimeter, and then connect the test leads to the
correct terminals.
Caution: To avoid damaging the multimeter, do not exceed the rated input limit.

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Rotary switch
position
Input terminals
Overload protection
( )
750 VAC/1000 VDC
250 VAC/300 VDC
1 A/1000 V
15 A/1000 V

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3. Making Measurements
Measuring AC or DC Voltage
Warning: Do not measure any voltage of over 1000 VDC or 750 VAC rms to
avoid instrument damage or electric shock.
Do not apply more than 1000 VDC or 750 VAC rms between the
common terminal and the earth ground to avoid instrument
damage or electric shock.
This multimeter displays DC voltage values as well as their polarity. Negative DC voltages
will display a negative sign on the left of the display.
(1) Rotate the rotary switch to or . Default is DC measurement mode, will
be displayed. Press to switch into AC measurement mode, will be
displayed.
(2) Connect the black test lead to the terminal and the red test lead to the
terminal.
(3) Probe the test points and read the display.
If necessary press to enable and cycle through the manual ranges.
Note: When measuring AC voltage, press to cycle through frequency measuring,
duty cycle measuring, and original measuring.
Measuring Resistance
Caution: To avoid possible damage to your multimeter or to the equipment
under test, disconnect the circuit power and discharge all high-voltage
capacitors before measuring resistance.
(1) Rotate the rotary switch to .
(2) Connect the black test lead to the terminal and the red test lead to the
terminal.
(3) Probe the test points and read the display.
If necessary press to enable and cycle through the manual ranges.