MTP 2326 User manual

MTP
INSTRUCTION MANUAL
Digital Multimeter
Model MTP 2326
MTP Instruments Inc.
Table of Contents
TITLE
PAGE
1. GENERAL INSTRUCTIONS
1
1.1 Precaution safety measures
1
1.1.1 Preliminary
1
1.1.2 During use
2
1.1.3 Symbols
4
1.1.4 Instructions
4
1.2 Protection mechanisms
5
2. DESCRIPTION
6
2.1 Instrument Familiarization
6
2.2 LCD Display
7
2.3 Key pad
8
2.4 Terminals
9
2.5 Accessories
9
3. FUNCTION DESCRIPTION
10
3.1 General Functions
10
3.1.1 DATA HOLD mode
10
3.1.2 Battery saver
10
3.2 Measurement Functions
11
3.2.1 AC and DC Voltage measurement
11
3.2.2 Resistance measurement
12
3.2.3 Diode Test
12
3.2.4 Continuity Check
13
Ⅰ

Table of Contents
TITLE
PAGE
3.2.5 Capacitance measurement
14
3.2.6 Inductance measurement
14
3.2.7 Transistor measurement
15
3.2.8 Current measurement
15
4. TECHNICAL SPECIFICATIONS
17
4.1 General specifications..
17
4.2 Measurement specifications
17
4.2.1 DC Voltage
18
4.2.2 AC Voltage
18
4.2.3 Resistance
18
4.2.4 Diode Test
19
4.2.5 Continuity Check
19
4.2.6 Transistor
19
4.2.7 Inductance
19
4.2.8 Capacitance
19
4.2.9 DC Current
20
4.2.110AC Current
20
5. MAINTENANCE
21
5.1 General maintenance
21
5.2 Battery replacement
21
1. GENERAL INSTRUCTIONS
This instrument complies with IEC 61010-1, CAT. III 1000V
and CAT.Ⅳ600V overvoltage standards. See Specifications.
To get the best service from this instrument, read carefully
this user's manual and respect the detailed safety
precautions.
International symbols used on the Meter and in this manual
are explained in chapter 1.1.3
1.1 Precautions safety measures
1.1.1 Preliminary
*Measurement category Ⅳmeters are designed to protect
against transients from the primary supply level (overhead
or underground utilityservice).
* Measurement category III is for measurements performed
in the building installation.
NOTE: Examples are measurements on distribution boards,
circuit-breakers, wiring, including cables, bus-bars, junction
boxes, switches, socket-outlets in the fixed installation, and
equipment for industrial use and some other equipment, for
example, stationary motors with permanent connection to
the fixed installation.
* Measurement category II is for measurements performed
on circuits directly connected to the low voltage installation.
NOTE: Examples are measurements on household
appliances, portable tools and similar equipment.
* Measurement category I is for measurements performed on
circuits not directly connected to MAINS.
NOTE: Examples are measurements on circuits not
derived from MAINS, and specially protected (internal)
Ⅱ
1

MAINS derived circuits. In the latter case, transient stresses
are variable; for that reason, requires that the transient
withstand capability of the equipment is made known to the
user.
*When using this Multimeter, the user must observe all
normal safety rules concerning:
―protection against the dangers of electric current.
―protection of the Multimeter against misuse.
*For your own safety, only use the test probes supplied with
the instrument. Before use, check that they are in good
condition.
1.1.2 During use
* If the meter is used near noise generating equipment, be
aware that display may become unstable or indicate large
errors.
* Do not use the meter or test leads if they look damaged.
* Use the meter only as specified in this manual; otherwise,
the protection provided by the meter may be impaired.
* Use extreme caution when working around bare conductors
or bus bars.
* Do not operate the meter around explosive gas, vapor, or dust.
* Verify a Meter's operation by measuring a known voltage.
Do not use the Meter if it operates abnormally. Protection
may be impaired. When in doubt, have the Meter
serviced.
* Uses the proper terminals, function, and range for your
measurements.
* When the range of the value to be measured is unknown,
check that the range initially set on the multimeter is the
highest possible or, wherever possible, choose the
autoranging mode.
* To avoid damages to the instrument, do not exceed the
maximum limits of the input values shown in the technical
specification tables.
*When the multimeter is linked to measurement circuits, do
not touch unused terminals.
* Caution when working with voltages above 60Vdc or 30Vac
rms. Such voltages pose a shock hazard.
* When using the probes, keep your fingers behind the finger
guards.
* When making connections, connect the common test lead
before connecting the live test lead; when disconnecting,
disconnect the live test lead before disconnecting the
common test lead.
* Before changing functions, disconnect the test leads from
the circuit under test.
* For all dc functions, including manual or auto-ranging, to
avoid the risk of shock due to possible improper reading,
verify the presence of any ac voltages by first using the ac
function. Then select a dc voltage range equal to or
greater than the ac range.
* Disconnect circuits power and discharge all high-voltage
capacitors before testing resistance, continuity, diodes, or
capacitance.
* Never perform resistance or continuity measurements on
live circuits.
* Before measuring current, check the meter's fuse and turn
off power to the circuit before connecting the meter to the
circuit.
*In TV repair work, or when carrying out measurements on
power switching circuits, remember that high amplitude
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3

voltage pulses at the test points can damage the multimeter.
Use of a TV filter will attenuate any such pulses.
* Use the 9V NEDA battery, properly installed in the Meter's
battery case, to power the Meter.
* Replace the battery as soon as the battery indicator ( )
appears. With a low battery, the Meter might produce
false readings that can lead to electric shock and personal
injury.
* Do not measure voltages above 600V in Category Ⅳ, or
1000V in Category III installations.
* Do not operate the Meter with the case (or part of the case)
removed.
1.1.3 Symbols:
Symbols used in this manual and on the instrument:
Caution:refer to the instruction manual.
Incorrect use may result in damage to the device
or its components.
~
AC (Alternating Current)
DC (Direct Current)
Earth ground
Double insulated
Fuse
Conforms to European Union directives
1.1.4 Instructions
* Remove test leads from the Meter before opening the
Meter case or battery cover.
* When servicing the Meter, use only specified replacement
parts.
* Before opening up the instrument, always disconnect from
all sources of electric current and make sure you are not
charged with static electricity, which may destroy internal
components.
*Any adjustment, maintenance or repair work carried out on
the meter while it is live should be carried out only by
appropriately qualified personnel, after having taken into
account the instructions in this present manual.
*A "qualified person" is someone who is familiar with the
installation, construction and operation of the equipment
and the hazards involved. He is trained and authorized to
energize and de-energize circuits and equipment in
accordance with established practices.
*When the instrument is opened up, remember that some
internal capacitors can retain a dangerous potential even
after the instrument is switched off.
*If any faults or abnormalities are observed, take the
instrument out of service and ensure that it cannot be used
until it has been checked out.
*If the meter is not going to be used for a long time, take out
the battery and do not store the meter in high temperature
or high humidity environment.
1.2 Protection mechanisms
*Fused by the fuse (FF400mA/1000V) during capacitance,
Inductance, mA and hFE measurements.
*A PTC resistor protects against permanent overvoltages of
up to 250V during resistance, continuity and diode test
measurements.
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5

2. DESCRIPTION
2.1 Instrument Familiarization
1 LCD display 2. Keypad 3. Rotary switch 4. Terminals
2.2 LCD Display
See Table 1 indicated for information about the LCD display.
Figure 1.Display
Table 1. Display Symbols
Symbol
Meaning
The battery is low.
Warning: To avoid false readings,
which could lead to possible electric shock
or personal injury, replace the battery as
soon as the battery indicator appears.
Indicates negative readings.
Indicator for ac voltage or current.
AC voltage and current are displayed as the
average of the absolute value of the input,
calibrated to indicate the equivalent rms
value of a sine wave.
Indicator for dc voltage or current.
The Meter is in the Diode Test mode
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7

Table 1. Display Symbols (continued)
The Meter is in the Continuity Check mode.
The Meter is in the Data Hold mode
V, mV
V:
mV:
Volts. The unit of voltage.
Millivolt. 1x10-3 or 0.001 volts.
A, mA, A
A:
mA:
A:
Amperes (amps).The unit of current.
Milliamp. 1x10-3 or 0.001 amperes.
Microamp. 1x10-6 or 0.000001 amperes
, k, M
:
k:
M:
Ohm. The unit of resistance.
Kilohm. 1x103or 1000 ohms.
Megohm. 1x106or 1,000,000 ohms.
mH,H
mH:
H:
The unit of Inductance 1H=1000mH
F, nF
F:
F:
nF:
Farad. The unit of capacitance.
Microfarad.1x10-6 or 0.000001 farads.
Nanofarad. 1x10-9 or 0.000000001
farads.
2.3 Keypad
See Table 2 indicated for information about the keypad
operations. Table 2. Keypad
Key
Function
Operation performed
Any switch position
turn the meter on or off
HOLD
Any switch position
Press HOLD to enter and
exit the Data Hold mode.
Any switch position
Press to turn the
backlight on. After about
5 seconds, the backlight
is auto-off.
2.4 Terminals
See Table 3 indicated for information about the terminals.
Table 3. Terminals
Terminal
Description
COM
Return terminal for all measurements.
（Receiving the black test lead or the “com”
plug of the special multi-function socket）
VHz
Input for voltage, resistance, frequency, diode
and continuity measurements. (Receiving the
red test lead)
mA
hFE
Lx
Input for capacitance, Inductance, hFE and mA
current measurements.（Receiving the red test
lead or the “+”plug of the special multi-function
socket）
10A
Input for 200mA to 10A current measurements.
(Receiving the red test lead)
2.5 Accessories
Delivered with the multimeter:
User's manual
One piece
Test leads
One piece
Carry case
One piece
Special Multi-function socket
One piece
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9

3. FUNCTION DESCRIPTION
3.1 General Functions
3.1.1 DATA HOLD mode
Data Hold mode makes the meter stop updating the
display. Data Hold function can be cancelled by changing
the measurement mode, or push HOLD key again.
To enter and exit the Data Hold mode:
1. Press HOLD key. Fixes the display on the current
value, is displayed.
2.Asecond short press returns the meter to normal mode.
3.1.2 Battery Saver
Turn on the meter. And then The Meter will be turned off
automatic after approx. 20 minutes.
3.2 Measurement Functions
3.2.1 AC and DC Voltage measurement
To avoid electrical shock and/or damage to the
instrument, do not attempt to take any voltage
measurement that might exceeds 1000Vdc or
750Vac rms.
To avoid electrical shock and/or damage to the
instrument, do not apply more than 1000Vdc or
750Vac rms between the common terminal and
the earth ground.
Voltage is the difference in electrical potential between two
points.
The polarity of ac (alternating current) voltage varies over
time; the polarity of dc (direct current) voltage is constant.
The Meter's DC voltage ranges are 200.0mV, 2.000V,
20.00V, 200.0V and 1000V；AC voltage ranges are 2.000V,
20.00V, 200.0V and 7500V.
To measure ac or dc voltage:
1. Set rotary switch to the proper range.
2. Connect the black and red test leads to the COM and
V terminals respectively.
3. Connect the test leads to the circuit being measured
4. Read the displayed value. The polarity of red test lead
connection will be indicated when making a DCV
measurement.
NOTE:
Unstable display may occur especially at DC200mV and
AC2V ranges, even though you do not put test leads into
input terminals, in this case, if an erroneous reading is
suspected, short the V terminal and the COM terminal,
and make sure the zero display.
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3.2.2 Resistance measurement
To avoid electrical shock and/or damage to the
instrument, disconnect circuit power and
discharge all high-voltage capacitors before
measuring resistance.
Resistance is an opposition to current flow.
The unit of resistance is the ohm ().
The Meter's resistance ranges are 200.0, 2.000k,
20.00k, 200.0k, 2.000M, 20.00Mand 200.0M.
To measure resistance:
1. Set the rotary switch to proper range.
2. Connect the black and red test leads to the COM and
terminals respectively.
3. Connect the test leads to the circuit being measured
and read the displayed value.
Some tips for measuring resistance:
The measured value of a resistor in a circuit is often
different from the resistor's rated value. This is because
the Meter's test current flows through all possible paths
between the probe tips.
In order to ensure the best accuracy in measurement of low
resistance, short the test leads before measurement and
memory the test probe resistance in mind. This necessary
to subtract for the resistance of the test leads.
On 20Mand 200Mranges, the meter may take a few
seconds to stabilize reading. This is normal for high
resistance measuring.
When the input is not connected, i.e. at open circuit, the
figure "1" will be displayed for the overrange condition.
3.2.3 Diode Test
To avoid electrical shock and/or damage to the
instrument, disconnect circuit power and
discharge all high-voltage capacitors before
testing diodes.
Use the diode test to check diodes, and other semi-
conductor devices. The diode test sends a current through
the semiconductor junction, and then measures the voltage
drop across the junction; a good silicon junction drops
between 0.5V and 0.8V.
To test a diode out of a circuit:
1. Set the rotary switch to range.
2. Connect the black and red test leads to the COM and
terminals respectively.
3. For forward-bias readings on any semiconductor
component, place the red test lead on the
component's anode and place the black test lead on
the component's cathode.
4. The meter will show the approx. forward voltage of the
diode. If the test lead connection is reversed, only
figure "1" displayed.
In a circuit, a good diode should still produce a forward bias
reading of 0.5V to 0.8V; however, the reverse-bias reading
can vary depending on the resistance of other pathways
between the probe tips.
3.2.4 Continuity Check
To avoid electrical shock and/or damage to the
instrument, disconnect circuit power and
discharge all high-voltage capacitors before
testing for Continuity.
Continuity is a complete path for current flow.
The beeper sounds if a circuit is complete. These brief
contacts cause the Meter to emit a short beep.
To test for continuity:
1. Set the rotary switch to range.
2. Press the yellowkey twice to activate Continuity Check.
3. Connect the black and red test leads to the COM and
terminals respectively.
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4. Connect the test leads to the resistance in the circuit
being measured.
5. When the test lead to the circuit is below approx. 30,
a continuous beeping will indicate it.
Note:
Continuity test is available to check open/short of the
circuit.
3.2.5 Capacitance measurement
To avoid electrical shock and/or damage to the
instrument, disconnect circuit power and
discharge all high-voltage capacitors before
measuring capacitance. Use the dc voltage
function to confirm that the capacitor is
discharged.
Capacitance is the ability of a component to store an
electrical charge.
The unit of capacitance is the farad (F). Most capacitors are
in the nanofarad to microfarad range.
The Meter's capacitance ranges are 20.00nF, 200.0nF,
2.000F, and 200.0F.
To measure capacitance:
1. Set the rotary switch to proper range.
2. Connect the black and red test leads to the COM and
terminals respectively
3. Connect the test leads to the capacitor being measured
and read the displayed value.
Some tips for measuring capacitance:
The meter may take a few seconds to stabilize reading.
This is normal for high capacitance measuring.
To improve the accuracy of measurements less than 20nF,
subtract the residual capacitance of the Meter and leads.
3.2.6 Inductance measurement
The unit of Inductance is the farad (H). The Meter's
Inductance ranges are 20.00mH, 200.0mH, 2.000H, and
20.00H.
To measure Inductance:
1. Set the rotary switch to proper range.
2. Connect the black and red test leads to the COM and
LXterminals respectively
3. Connect the test leads to the Inductance being
measured and read the displayed value.
3.2.7 Transistor measurement
To avoid electrical shock and/or damage to the
instrument, do not apply more than 250Vdc or
250Vac rms between the hFE terminal and the
COM terminal.
1. Set the rotary switch to hFE range.
2. Connect the “com”plug and “+”plug of the special
multi-function socket to the COM and hFE terminals.
3. Determine whether the transistor to be tested is NPN or
PNP type and locate the Emitter, Base and Collector leads.
4. Insert leads of the transistor into proper holes of the
special multi-function socket.
5. The meter will show the approx. hFE value at test
condition of base current 10μA and Vce 2.8V.
3.2.8 Current measurement
To avoid damage to the Meter or injury if the fuse
blows, never attempt an in-circuit current
measurement where the open-circuit potential to
earth is greater than 250V.
To avoid damage to the meter, check the meter's
fuse before proceeding. Use the proper terminals,
function, and range for your measurement. Never
place the test leads in parallel with a circuit or
component when the leads are plugged into the
current terminals.
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Current is the flow of electrons through a conductor.
The Meter's DC current ranges are 200.0mA and 10.00A；
AC current ranges are 200.0mA and 10.00A.
To measure current:
1. Turn off the power of the measured circuit. Discharge all
the high voltage capacitors.
2. Set the rotary switch to the proper range.
3. Connect the black test lead to the COM terminal and
the red test leads to the mA terminal for a maximum of
200mA. For a maximum of 10A, move the red test lead
to the 10A terminal.
4. Break the circuit path to be tested.
Connect the black test lead to the more negative side of
the break; connect the red test lead to the more positive
side of the break. (Reversing the leads will give a
negative reading, but will not damage the Meter.)
5. Turn on the power of the measured circuit, and then
read the display. Be sure to note the measurement
units at the right side of the display (mA or A). When
only the figure "1" displayed, it indicates overrange
situation and the higher range has to be selected.
6. Turn off the power of the measured circuit and discharge
all the high voltage capacitors. Remove the test leads and
recover the measured circuit.
4 TECHNICAL SPECIFICATIONS
4.1 GENERAL SPECIFICATIONS
Environment conditions:
1000V CAT. III and 600V CAT.Ⅳ
Pollution degree: 2
Altitude < 2000m
Operating temperature:
0~40℃, 32℉~122℉(<80% RH, <10℃noncondensing)
Storage temperature:
-10~60 ℃, 14℉~140℉(<70% RH, battery removed)
Temperature Coefficient:
0.1(specified accuracy) / ℃(<18℃or >28℃)
MAX. Voltage between terminals and earth ground:
750V AC rms or 1000V DC.
Fuse Protection: mA: fuse (FF400mA/1000V)
A: fuse (FF10A/500V)
Sample Rate: 3 times/sec for digital data.
Display: 3 1/2 digits LCD display. Automatic indication of
functions and symbols.
Over Range indication: LCD will display "1".
Low battery indication:
The " " is displayed when the battery is under the proper
operation range.
Polarity indication: "" displayed automatically.
Power source: 9V
Battery type: NEDA1604, 6F22, or 006P.
Dimensions: 188(L)92(W)50(H) mm.
Weight: 380g. Approx. (battery included).
4.2 Measurement specifications
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Accuracy is specified for one year after calibration, at
operating temperatures of 18℃to 28 ℃, with relative
humidity at 0% to 75%.
Accuracy specifications take the form of: ±(% of Reading +
Number of Least Significant Digits)
4.2.1 DC Voltage
Range
Resolution
Accuracy
200mV
0.1mV
±(0.5% of rdg +1 digit)
2V
1mV
20V
10mV
200V
100mV
1000V
1V
±(0.8% of rdg +2 digits)
Input impedance: 10M
Max. input voltage: 250Vdc or ac rms for 200mV range and
1000Vdc or 750V ac rms for other ranges,
4.2.2 AC Voltage
Range
Resolution
Accuracy
2V
1mV
±(0.8% of rdg +3 digits)
20V
10mV
200V
100mV
750V
1V
±(1.2% of rdg +3 digits)
Input impedance: 10M
Max. input voltage: 250Vdc or ac rms for 200mV range and
1000Vdc or 750V ac rms for other ranges,
Frequency Range: 40Hz-400Hz ranges.
Response:Average, calibrated in rms of sine wave
4.2.3 Resistance
Range
Resolution
Accuracy
200
0.1
±(0.8% of rdg+3 digits)
2k
1
±(0.8% of rdg+1 digit)
20k
10
200k
100
2M
1k
20M
10k
±(1.0% of rdg+2 digits)
200M
0.1M
±[5.0% +10 digits]
Overload protection: 250V dc or 250Vac rms.
Open Circuit Voltage: Less than 700mV.
4.2.4 Diode
Range
Resolution
Function
1mV
Display read approx. forward
voltage of diode
Forward DC Current: approx. 1mA
Reversed DC Voltage: approx. 2.8V
Overload protection: 250Vdc or 250Vac rms.
4.2.5 Audible continuity
Range
Continuity beeper
≤30
Test Current: approx. 1mA
Reversed DC Voltage: approx. 2.8V
Overload protection: 250Vdc or 250Vac rms.
4.2.6 Transistor
Range
Description
Test Condition
hFE
Display read approx.
HFE value (0-1000) of
transistor under test (all
type).
Base Current approx.
10μA, Vce approx.
2.8V.
4.2.7 Inductance
Range
Resolution
Accuracy
20mH
0.01mH
（3.0%rdg + 5dgt）
200mH
0.1mH
（3.0%rdg + 5dgt）
2H
1mH
（3.0%rdg + 5dgt）
20H
10mH
（3.0%rdg + 5dgt）
Overload protection: fuse (FF400mA/1000V).
4.2.8 Capacitance
Range
Resolution
Accuracy
20nF
10pF
±(4.0% of rdg+3 digits)
200nF
0.1nF
2F
1nF
200F
100nF
±(5.0% of rdg+10 digits)
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Overload protection: fuse (FF400mA/1000V).
4.2.9 DC Current
Range
Resolution
Accuracy
200mA
0.1mA
±(1.5% of rdg+1 digit)
10A
10mA
±(2.0% of rdg+5 digits)
Overload protection: fuse (FF400mA/1000V). 10A range fuse
(FF10A/500V)
Max. input current: 200mA dc or 200mA ac rms for mA range,
10A dc or 10A ac rms for 10A ranges.
For measurements>5A, 10 Seconds maximum ON to
measure 1 minutes OFF;Above 10Aunspecified.
4.2.10 AC Current
Range
Resolution
Accuracy
200mA
0.1mA
±(1.8% of rdg+3 digits)
10A
10mA
±(3.0% of rdg+7 digits)
Overload protection: fuse (FF400mA/1000V). 10A range fuse
(FF10A/500V)
Max. input current: 200mA dc or 200mA ac rms for mA range,
10A dc or 10A ac rms for 10A ranges.
For measurements>5A, 10 Seconds maximum ON to
measure 1 minutes OFF;Above 10Aunspecified.
Frequency Range: 40Hz-400Hz
Response:Average, calibrated in rms of sine wave
5. MAINTENANCE
Do not attempt to repair or service your Meter unless you are
qualified to do so and have the relevant calibration,
performance test, and service information.
5.1 General Maintenance
To avoid electrical shock or damage to the meter,
do not get water inside the case. Remove the test
leads and any input signals before opening the
case
Periodically wipe the case with a damp cloth and mild
detergent. Do not use abrasives or solvents.
Dirt or moisture in the terminals can affect readings.
To clean the terminals:
Turn the meter off and remove all test leads.
Shake out any dirt that may be in the terminals.
Soak a new swab with a cleaning and oiling agent (such as
WD-40).
Work the swab around in each terminal. The oiling agent
insulates the terminals from moisture-related contamination.
5.2 Battery and Fuse replacement
To avoid false readings, which could lead to
possible electric shock or personal injury, replace
the battery as soon as the battery indicator ( )
appears.
Use only fuses with the amperage,interrutp,voltage
And speed ratings specified
FF400mA/1000V Min interrupt rating 10000A
FF10A/500V Min interrupt rating 10000A
To replace the battery or fuse:
Turn the meter off.
Disconnect test leads and/or any connectors from the
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terminals.
Use a screwdriver to unscrew the two screws secured on
the battery cover.
Take out the battery cover from the meter.
Remove the used batteries or damaged fuse.
Replace with the new 9V batteries (6F22)or new fuse.
Rejoin the battery cover and secure by the two screws.
CAUTION
Using this appliance in an environment with a strong
radiated radio-frequency electromagnetic field (approx.
3V/m), may influence its measuring accuracy. The
measuring result can be strongly deviating from the
actual value.
Les Instruments
MTP
Instruments
Head Office
4409, Charleroi street
Montreal-North, Quebec
H1H 1T6
Telephone: [phone] Fax: [phone]
Toll Free Number: 1-888-326-7167
Web Site: www.mtpinc.com
E-mail: [e-mail]
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