Mastech MY-60 User manual

⊙ MY-60 ⊙MY-60T
⊙ MY-61 ⊙MY-62
⊙ MY-63 ⊙MY-64
○ ○
DIGITAL
MULTIMETER
OPERATOR’S
MANUAL

1. INTRODUCTION
This MY-60 Series Digital Multimeter is a compact precision, battery operated,
LCD display 3-½ digits Digital Instrument.
Superiority:
9High accuracy
9Large LCD display
9Digital height 25mm
9Single 32 position rotary switch for FUNCTION and RANGE
selection, allows fast and convenient operation.
9Curvilinear mode soft case.
9Colored indication jack with fully protection test leads.
9Lower power indication & Auto-Power Off
2. GENERALSPECIFICATION
1) Display: 3-½ digits LCD with a maximum reading of 1999.
2) Measurement rate: updates 2-3/sec.
3) Over range indication: “1” figure only in the display
4) Automatic negative polarity indication.
5) The “ ” is displayed when the battery voltage drops below the
operating voltage.
6) Full range over load protection.
7) Capacitance measurement Auto-Zeroing.
8) Auto Power Off: It will be automatically cut off in about 15 minutes after
the power is turned on. It needs to be turned off and turned on again to
continue the power.
9) Operating temperature: 0°C~40°C, 0~75% R.H.
Storage temperature: -10°C~50°C, 0~75% R.H.
10) Power: Single standard 9V battery IEC 6F22,NEDA 1604, JIS 006P.
11) Dimensions: 189L*90W*34Hmm.
12) Weight: approx 230g (including battery)
13) Accessories: test leads (pair), K-type thermocouple wire (model
MY-60T/MY-62/MY-64 only), operator’s manual.
3. ELECTRICAL SPECIFICATIONS
Accuracy is given as ± (% of reading + number of least significant digits) for
one year, at 23°C±5°C RH<75%
1) DCV

MY-60 MY-60T MY-61 MY-62 MY-63 MY-64
200mV
2V
20V
200V
1000V 0.8%±2
Accuracy
Range
0.5%±1
0.5%±2
Input impedance: 10MΩon all range
2) ACV
MY-60 MY-60T MY-61 MY-62 MY-63 MY-64
200mV
2V
20V
200V
700V
Range
0.8%±3
0.8%±3
1.2%±3
Accuracy
Input impedance: 10MΩFrequency range: 40 ~ 400Hz
3) DCA
MY-60 MY-60T MY-61 MY-62 MY-63 MY-64
20uA
200uA
2mA
20mA
200mA
2A
10A
1.0% ±2
1.0%±2
2.0%±3
Range
2.0% ±5
1.2%±2
Accuracy
1.5% ±3
Measuring voltage drop: 200mV
4) ACA
MY-60 MY-60T MY-61 MY-62 MY-63 MY-64
200uA 1.2%±3
2mA
20mA
200mA
2A
10A 3.0%±3
Range Accuracy
2.0% ±3
1.5%±3
1.5%±3
Measuring voltage drop: 200mV Frequency range: 40 ~ 400Hz
5) CAPACITANCE
MY-60 MY-60T MY-61 MY-62 MY-63 MY-64
2nF
20nF
200nF
2uF
20uF
Range Accuracy
4.0%±3
6) OHM

MY-60 MY-60T MY-61 MY-62 MY-63 MY-64
200Ω
2KΩ
20KΩ
200KΩ
2MΩ
20MΩ
200MΩ
1.0%±5
5.0%±20
Range Accuracy
1.0%±10
1.0%±3
7) TEMPERATURE (MY-60T/MY-62/MY-64 only)
MY-60T MY-62 MY-64
-20℃~ 400℃
400℃~ 1000℃
Range Accuracy
0.75%±3
1.5%±15
With K-type thermocouple wire
8) FREQUENCY TEST(MY-63 & MY-64 only)
MY-63 MY-64
2KHz
20KHz
Range Accuracy
1.5%±10
Sensitivity: 100mV rms
4. PRECAUTIONS AND PREPARATIONS FOR MEASUREMENT
1) Be sure that battery is correctly placed in the battery case and
connected to the battery snap.
2) Don’t exceed the input limit shown below:
Function Range Input terminals Maximum input
DCV 200mV 250VDC
ACV 200mV 250VAC
DCV 2~1000V 1000VDC
ACV 2~700V 700VAC
OHM V/OHM COM
Freq. V/OHM/Hz COM
Diode V/OHM COM
DCA 200mA
ACA 200mA
DCA 2A
ACA 2A
DCA10A
ACA10A 10A DC/AC10A COM
V/OHM COM
250V DC/AC
A COM
200mA DC/AC
2A DC/AC
3) Inspect the test leads for damaged insulation or exposed metal. Check
Test lead continuity. Damaged leads should be replaced.
4) Select the proper function and range for your measurement.
5) Check the input terminal position for red test lead depends on

measurement ranges.
6) Either one of the test leads should be taken off from the circuit under
test when changing the test ranges.
7) To avoid electrical shock or damage to the meter; Do not apply more
then 500V between any terminal and earth ground.
8) To avoid electronic shock, use caution when working above 60VDC or
25VAC rms, such voltage pose a shock hazard.
9) When finished the measurement, switch off the power. Be sure to
remove the battery when it is not used for a long time to avoid leakage
problem.
10) Do not tamper with the circuitry to avoid damage.
11) Do not use or store the instrument in a place of direct sunlight, high
temperature and high humidity.
5. METHOD OF MEASUREMENT
5.1 DCV &ACV MASUREMENT
1) Set the Function range switch at the required position.
2) Connect black test lead to “COM” terminal and red test lead to the
“V/OHM” input terminal.
3) Connect test leads to measuring point and read the display value the
polarity of the red lead connection will be indicated at the same time as the
voltage.
Note:
a) If the voltage to be tested is unknown beforehand, set the
Function range switch to the highest range and work down.
b) When only the figure “1” is displayed over range is being indicated
and the function range switch has be set to a higher range.
c) Never try to measure the voltage above 1000V! Although the
indication is possible to show, there is danger of damaging the
internal circuitry.
5.2 DCA& ACAMEASUREMENT
1) Connect the black test lead to the “COM” terminal and the red test lead
to “A” terminal for a maximum of 0.5A (model MY-60 & MY-60T maximum
2A)
2) Set the function range switch at the required position.
3) Connect test leads to measuring points and read the display value. The

polarity at the red test lead connection will be indicated at the same time as
the current.
Note:
a) If the current range is unknown beforehand, set the function range
switch to the highest range and work down.
b) When only the figure “1” is displayed, over range is being
indicated and the function range switch has be set to a higher
range.
c) Excessive current will below the fuse that must be replaced when
the input is from “A” terminal. Fuse type is 0.5A (model MY-60 &
MY-60T maximum 2A).
d) A fuse does not protect the 10A range. Maximum 8A continuous,
maximum 10A measuring time must be less than 15 seconds.
5.3 RESISTANCE MEASUREMENT
1) Connect black test lead to “COM” terminal and red test lead to the
“V/OHM” input terminal.
2) Set the function range switch to the OHM range.
3) Connect the test leads across the resistance under measurement and
read the display value.
Note:
a) The polarity of the red test lead is “+”.
b) When the input is not connected, i.e. at open circuit the figure “1”
will be displayed for the over range condition.
c) If the resistance value being measured exceeds the maximum
value of the range selected an over range indication “1” will be
displayed and function range switch must be set to a higher
range.
d) 200MΩrange has a 10 digits (1MΩ) constant, the figure will
appear in short circuit status it should be subtracted from
measurement result, for instance: when measuring 100MΩ
resistor, figure 101.0 will shown in display and the last 10 digits
should be subtracted.
5.4 CAPACITANCE MEASUREMENT
1) Set the function range switch at the “Cx” position. Before connecting the
capacitor, the display that could be zeroed automatically slows.
2) Connect the test capacitor to the “Cx” input socket (not test leads) and

read the display value.
Note: The tested capacitor should be discharged before the testing
procedure. Never apply voltage to the “Cx” input socket, or serious damage
may result.
5.5 FREQUENCY MEASUREMENT
1) Set the function range switch at the required “Hz” position.
2) Connect test leads to measuring points and read the display value.
Note: Do not apply more than 250V rms to the input. Indication is possible a
voltage higher than 100V rms, but reading maybe out of specification.
5.6 TEMPERATURE MEASUREMENT
1) Set the function range switch at the “TEMP” position.
2) Be sure the polarity of the thermocouple, put the cold end (free end) of
the thermocouple sensor into the temperature testing holes.
3) The working end (testing end) on or inside the object being tested.
4) The value of the temperature is shown on the display in degrees
centigrade (°C).
Note:
a) The testing temperature is displayed automatically when the
thermocouple is put into the testing holes.
b) The surrounding temperature is shown when the circuit of the
sensor is cut off.
c) The limit temperature measured by the thermocouple given
together with the instrument is 250°C, 300°C is acceptable within
short period.
5.7 DIODE & CONTINUITY TEST
1) Set the function range switch at the “ ” position.
2) Connect the black test lead to “COM” terminal and red test lead to
“V/OHM” input terminal (Note: the polarity of the red test lead is “+”).
3) This range with “AUDIBLE CONTINUITY TEST” function. Built-in
buzzer sounds if the resistance between two probes is less than 30±10Ω.
4) Connect the test leads across the diode and read the display value.
Note:
a) When the input is not connected, i.e. at open circuit, the figure “1”
will be displayed.
b) Test condition: Forward DC current approx.1mA. Reversed DC

voltage approx. 2.8V.
c) The meter displays the forward voltage drop and displays figure
“1” for overload when the diode is reversed.
5.8 TRANSISTOR hFE TEST
1) Set the function range switch to the “hFE” position.
2) Make sure the transistor is “NPN” or “PNP” type.
3) Transistor correct insert to E.B.C connector.
4) Display reading is approx. transistor hFE value.
Note:
Test condition: Base current approx. 10uA. VCE approx.2.8V
6. BATTERYAND FUSE REPLACEMENT
1) Battery and fuse replacement should only done after the test leads have
been disconnected and power is off.
2) Loosen screws with suitable screwdriver and remove case bottom.
3) The meter is power by a single 9V battery (IEC 6F22, NEDA 1604, JIS
006P). Snap the battery connector leads to the terminals of a new battery
and reinsert the battery into the case top. Dress the battery leads so that
they will not be pinched between the case bottom can case top.
4) The meter is protected fast fuse 0.5A/250V (model MY-60 & MY-60T
protected fuse 2A/250V), dimensions is Φ5*20mm.
5) Replace the case bottom and reinstall the three screws. Never operate
the meter unless the case bottom is fully closed.

OPERATOR’S
MANUAL
CAUTION:
* Before attempting to insert transistors capacitor thermocouple for testing, always be sure
that test lest leads have been disconnected from any measurement circuits.
* Components should not be connected to the hFE and capacitor and the thermocouple
socket when making voltage measure with test leads.
*Using this appliance in an environment with a strong radiated radio – frequency
electromagnetic field (approximately 3V/m), may influence its measuring accuracy. The
measuring result can be strongly deviating from the actual value.
CONTENTS PACE
1. SAFETY INFORMATION…………………………………………………………………….1
1.1 PRELIMINARY……………………………………………………………………………1
1.2 DURING USE……………………………………………………………………………..2
1.3 SYMBOLS…………………………………………………………………………………3
1.4 MAINTENANCE…………………………………………….…………………………….4
2. DESCRIPTION………………………………………………..………………………………5
3. OPERATING INSTRUCTION………………………………..………………………………9
3.1 MEASURING VOLTAGE……………………………………………………………….9
3.2 MEASURING CURRENT……………………………………………………………….9
3.3 MEASURING FREQUENCY…………………………………………………………..10
3.4 MEASURING RESISTANCE…………………………………………………………..11
3.5 MEASURING CAPACITANCE………………………….……………………………..12
3.6 TESTING DIODE…………………………………….…………………………………13
3.7 TESTING TRANSISTOR………………………………………………………………13
3.8 CONTINUITY TEST……………………………………………………………………14
3.9 MEASURING TEMPERATURE…………………..…………………………………..14
4. SPECIFICATIONS……………………………………………………………………………15
5. ACCESSORIES………………………………………………………………………………23
5.1 SUPPLIED WITH THE MULTIMETER…………………………………………………23
5.2 OPTIONALACCESSORY…………………………………….. ……………………..23
5.3 HOW TO USE THE HOLSTER……………………………………………………….24
6. BATTERY & FUSE REPLACEMENT……………………………………………………….26

1. SAFETY INFORMATIONS
This multimeter has been designed according to IEC-1010 concerning electronic measuring
instruments with an overvoltage category (CATⅡ) and pollution 2.
Follow all safety and operating instructions to ensure that meter is used safely and is kept in
good operating condition.
1.1 PRELIMINARY
* When using this meter, the user must observe all normal safety rules concerning:
－Protection against dangers of electronic current.
－Protection of the meter against misuse.
* Full compliance with safety standards can be guaranteed only if used with test
leads supplied. If necessary, they must be replaced with the same model or same
electronic ratings. Measuring leads must be in good condition. -1-
1.2 DURING USE
* Never exceed the protection limit values indicated in specifications for each range
of measurement.
* When the meter is linked to measurement circuit, do not touch unused terminals.
* When the value scale to be measured is unknown beforehand, set the range
selector at the highest position.
* Before rotating the range selector to change functions, disconnect test leads from
the circuit under test.
* When carrying out measurements on TV or switching power circuits, always
remember that there may be high amplitude voltage pulses at test points which can
damage the meter.
* Never perform resistance measurements on live circuits.
-2-
* Never perform capacitance measurements unless the capacitor to be measured
been discharged fully.
* Always be careful when working with voltage above 60V dc or 30V ac rms. Keep
fingers behind the probe barriers while measuring.
* Before attempting to insert transistors capacitor thermocouple for testing, always be
sure that test leads have been disconnected from any measurement circuits.
* Components should not be connected to the hFE and capacitor socket and the
thermocouple has been removed when making voltage measurements with test
leads.
1.3 SYMBOLS
Important safety information, refer to the operating manual.
Dangerous voltage may be present.
Earth ground
Double insulation (protection classⅡ) -3-