Custom Thermoelectric MS8264 Handheld Digital Multimeter Operator's Instruction Manual

HANDHELD
DIGITAL MULTIMETER
OPERATOR'S
INSTRUCTION MANUAL
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Table of Contents
TITLE
1. GENERAL INSTRUCTIONS
1.1 Precaution safety measures
1.1.1 Preliminary
1.1.2 During use
1.1.3 Symbols
1.1.4 Instructions
1.2 Protection mechanisms
2. DESCRIPTION
2.1 Instrument Familiarization
2.2 LCD Display
2.3 Key pad
2.4 Terminals
2.5 Accessories
3. FUNCTION DESCRIPTION
3.1 General Functions
3.1.1 DATA HOLD mode
3.1.2 Battery saver
>) 3.2 Measurement Functions
3.2.1 AC and DC Voltage measurement
3.2.2 Resistance measurement
3.2.3 Diode Test
3.2.4 Continuity Check
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Table of Contents
TITLE
3.2.5 Capacitance measurement
3.2.6 Transistor measurement
3.2.7 Frequency measurement
3.2.8 Temperature measurement
3.2.9 Current measurement
4. TECHNICAL SPECIFICATIONS
4.1 General specifications..
4.2 Measurement specifications
4.2.1 DC Voltage
4.2.2 AC Voltage
4.2.3 Frequency
4.2.4 Resistance
4.2.5 Diode Test
4.2.6 Continuity Check
4.2.7 Transistor
4.2.8 Temperature
4.2.9 Capacitance
4.2.10 DC Current
4.2.11 AC Current
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5.1 General maintenance
5.2 Battery replacement
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1.
GENERAL INSTRUCTIONS
This instrument complies with IEC 1010-1 (61010-1@IEC: 2001),
CAT. Il 1000V and CAT. Ill 600V 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
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*
Measurement category lll 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 Il 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 | 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) MAINS derived circuits.
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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.
A 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.
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+ Uses the proper terminals, function, and range for your measurements.
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“+ 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.
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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 de 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 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 ( £3] )
appears. With a low battery, the Meter might produce false
readings that can lead to electric shock and personal injury.
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* Do not measure voltages above 600V in Category III, or 1000V in
Category ll 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.
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AC (Altemating Current)
DC (Direct Current)
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+ Earth ground
El Double insulated
> Fuse
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: 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
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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 resettable fuse (F200mA/250V) during capacitance,
temperature, mA and hFE measurements,
* A PTC resistor protects against permanent overvoltages of up to
380V during resistance, Frequency, continuity and diode test
measurements.
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2. DESCRIPTION
2.1 Instrument Familiarization
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1. LCD display 2. Keypad 3. Rotary switch 4. Terminals
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2.2 LCD Display
See Table 1 indicated for information about the LCD display.
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Figure 1.Display
Table 1. Display Symbols
| Symbol Meaning
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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
AC 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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Table 1. Display Symbols (continued)
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01) The Meter is in the Continuity Check mode.
CI The Meter is in the Data Hold mode
C: Celsius scale. The unit of temperature.
C or F
TF: Fahrenheit scale.
V: Volts. The unit of voltage.
Ya 0 mV: Millivolt. 1x10°* or 0.001 volts.
A: Amperes (amps). The unit of current.
A, MA, pA | mA: Milliamp. 1x10 ° or 0.001 amperes.
HA: Microamp. 1x10 or 0.000001 amperes
©: Ohm. The unit of resistance.
0, kQ, MQ | kQ: Kilohm. 1x10 or 1000 ohms.
MO: Megohm. 1x10 or 1,000,000 ohms.
kHz |KHz: Kilohertz. 1x10” or 1000 hertz.
Е: Farad. The unit of capacitance.
E uF, nF uF: Microfarad.1x10 ~ or 0.000001 farads.
nF: — Nanofarad. 1x10" or 0.000000001 farads.
53 Keypad
5ee Table 2 indicated for information about the keypad operations.
: Table 2. Keypad
№ Кеу Function Operation performed
| ON/OFF| Any switch position turn the meter on or off
HOLD
Any switch position
the Data Hold mode.
LIGHT
Any switch position
backlight is auto-off.
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Press HOLD to enter and exit
Press LIGHT to tum the backlight
on. After about 5 seconds, the
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2.4 Terminals
See Table 4 indicated for information about the terminals.
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Table 4. Terminals
Terminal Description
Return terminal for all measurements. (Receiving
COM | the black test lead or the “com” plug of the special
multi-function socket)
Input for voltage, resistance, frequency, diode and
PHvQHz | continuity measurements. (Receiving the red test
lead)
Input for capacitance, Temperature, hFE and
CTmA | 0.001mA to 200mA current measurements.
4FhFE | (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:
+ Users manual One piece
« Test leads One piece
+ K"type bead Thermocouple One piece
« Special Multi-function socket One piece
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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. A second 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. 30 minutes.
3.2 Measurement Functions
3.2.1 AC and DC Voltage measurement
A To avoid electrical shock and/or damage to the
instrument, do not attempt to take any voltage
measurement that might exceeds 1000Vde 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.
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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.
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To measure ac or de 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.
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.
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Resistance is an opposition to current flow.
The unit of resistance is the ohm (£2).
The Meter's resistance ranges are 200.00, 2.000k£2, 20.00k%2,
200.0k£2, 2.000M, 20.00MO 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 Q
terminals respectively.
3. Connect the test leads to the circuit being measured and read
the displayed value.
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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.
The resistance function can produce enough voltage to
forward-bias silicon diode or transistor junctions, causing them to
conduct. To avoid this, do not use the 40M range for in-circuit
resistance measurements.
On 20M& and 200ML2 ranges, the meter may take a few seconds
to stabilize reading. This is normal for high resistance measuring.
On 200MO range, the display is approx. 10 digits when test leads
are shorted. These 10 digits have to be subtracted from measuring
results. For example, when measuring 100 MQ resistance, the
reading will be 101.0 and the correct measuring result should be
= 101.041 .0=100.0 Ме.
= When the input is not connected, i.e. at open circuit, the figure "1"
E Will be displayed for the overrange condition.
$23 Diode Test
‘ /\ To avoid electrical shock and/or damage to the
: instrument, disconnect circuit power and discharge all
3 high-voltage capacitors before testing diodes.
Use the diode test to check diodes, and other semi- conductor
Uevices. 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 PF 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 yellow key twice to activate Continuity Check.
3. Connect the black and red test leads to the COM and Q
terminals respectively.
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£2, a
continuous beeping will indicate it.
Note:
« Continuity test is available to check open/short of the circuit.
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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, 2.000uF,
and 20.00uF.
To measure capacitance:
1. Set the rotary switch to proper range.
2. Connect the black and red test leads to the COM and dF
terminals respectively (or you can measure the capacitance by
using the special Multi-Function Socket).
: 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.
_ lo improve the accuracy of measurements less than 20nF, subtract
! the residual capacitance of the Meter and leads.
3.2.6 Transistor measurement
Á 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.
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==
. 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 10 1 A and Vce 2.8V.
3.2.7 Frequency measurement
Do not measure Frequency on high voltage (>380V) to -
avoid electrical shock hazard and/or damage to the
instrument.
Frequency is the number of cycles a voltage or current signal
completes each second.
— To measure frequency:
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1. Set the rotary switch to 20kHz range.
2. Connect the black and red test leads to the COM and Hz
terminals respectively.
3. Connect the test leads to the circuit being measured
4. Read the displayed value.
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3.2.8 Temperature measurement
A To avoid electrical shock and/or damage to the
instrument, do not apply more than 250Vdc or 250Vac
rms between the TU terminal and the COM terminal.
To avoid electrical shock, do not use this instrument when
voltages at the measurement surface exceed 60v dc or
24v rms. Ac.
To avoid damage or burns. Do not make temperature
measurements in microwave ovens.
To measure temperature:
1. Set the rotary switch to C range and the LCD will show the
current environment temperature.
2, Connect the “com” plug and “+” plug of the special multi-function
socket to the COM and hFE terminals.
3. Insert 'K’ type thermocouples into the special multi-function socket,
Takings care to observe the correct polarity.
4. Touch the object with the thermocouple probe for measurement.
5. Read the stable reading from LCD.
3.2.9 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.
Current is the flow of electrons through a conductor,
The Meter's DC current ranges are 20.00mA, 200.0mA and
10.00A: AC current ranges are 2.000mA, 200.0mA and 10.00A.
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To measure current:
1. Tum 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. Tum 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. Il and 600V CAT. Ill
Pollution degree: 2
Altitude < 2000m
Operating temperature:
0-40C, 32 —122"F (<80% RH, <10'C noncondensing)
Storage temperature:
-10-60 C, 14°F ~140°F (<70% RH, battery removed)
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Temperature Coefficient:
0.1x(specified accuracy) / C (<18C or>28C)
MAX. Voltage between terminals and earth ground:
750V AC rms or 1000V DC.
Fuse Protection: mA: Resettable fuse (F200mA/250V)
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 "EC" is displayed when the battery is under the proper
operation range.
Polarity indication: "— displayed automatically.
Power source: 9V ==-
— Battery type: NEDA 1604, 6F22, or 006P.
5 ‘Dimensions: 195(L)x92(W)x55(H) mm.
Weight: 380g. Approx. (battery included).
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: 4.2 Measurement specifications
Accuracy is specified for one year after calibration, at operating
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~ “temperatures of 18°C to 28°C, with relative humidity at 0% to 75%.
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Accuracy specifications take the form of: + (% of Reading +
Number of Least Significant Digits)
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+(0.5% of rdg +1 digit)
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Max. input voltage: 250Vdc or ac rms for 200mV range and 1000Vdc
or 750V ac rms for other ranges,
+(0.8% of rdg +3 digits)
1
Max. input voltage: 250Vdc or ac rms for 200mV range and 1000Vdc
or 750V ac rms for other ranges,
Frequency Range: 40Hz-200Hz for 750V range, 40Hz-400Hz for
other ranges.
: Response: Average, calibrated in rms of sine wave
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+ 4.2.3 Frequency
«| Range Resolution Accuracy 21]
:| 20kHz 10 Hz + (1.5% of rdg+5 digits) |
=: Overload protection: 380V dc or 380V ac rms.
: Input Voltage range: 200mV-10V ac rms
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Overload protection: 380V dc or 380Vac rms.
Open Circuit Voltage: Less than 700mV.
4.2.5 Diode
| Range | Resolution Function
Display read approx. forward voltage
>+ ImV | of diode
Forward DC Current: approx. 1mA
Reversed DC Voltage: approx. 2.8V
Overload protection: 380Vdc or 380Vac rms.
4.2.6 Audible continuity
Range | Continuity beeper
oul) = 300
Open circuit voltage: Less than 700mV.
Overload protection: 380Vdc or 380Vac rms.
4.2.7 Transistor
Range Description Test Condition
Display read approx. HFE | Base Current approx.
ПРЕ | value (0-1000) of transistor | 10 1 A, Vce approx.
under test (all type). 2.8V.
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5 Temperature specifications do not include thermocouple errors.
4.2.9
+(4.0% of rdg+3 digits)
Overload protection: Resettable fuse (F200mA/250V).
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4.2.10 DC Current
+(1.5% of rdg+1 digit)
Overload protection: Resettable fuse (F200mA/250V). 10A range
unfused
Max. input current: 200mA dc or 200mA ac rms for mA range, 10A
dc or 10A ac rms for 10A ranges.
For measurements>5A, 4 minutes maximum ON to measure 10
minutes OFF; Above 10A unspecified.
4.2.11 AC
Resolution
1 1.0% of
0.1mA 1.8% of
1 10mA of 7
Overload protection: Resettable fuse (F200mA/250V). 10A range
unfused.
Max. input current: 200mA dc or 200mA ac rms for mA range, 10A
dc or 10A ac rms for 10A ranges.
For measurements>5A, 4 minutes maximum ON to measure 10
minutes OFF; Above 10A unspecified.
Frequency Range: 40Hz-400Hz
Response: Average, calibrated in rms of sine wave
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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.
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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.
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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 replacement
/NTo avoid false readings, which could lead to possible
electric shock or personal injury, replace the battery as
soon as the battery indicator ([=%] ) appears.
Before replacing the battery, disconnect test leads
and/or any connectors from any circuit under test, turn
the meter off and remove test leads from the input
terminals.
: To replace the battery (see Figure 2.):
Turn the meter off.
Disconnect test leads and/or any connectors from the 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.
Replace with the new 9V batteries (6F22).
Rejoin the battery cover and secure by the two screws.
CUSTOM THERMOELECTRIC
Sg
Bt
Figure 2. Battery and Fuse Replacement
A 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.
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