Mastech MS8250D User manual

MS8250D

DUAL DISPLAY

DIGITAL MULTIMETER

User’s Manual

Warning

01 0 2

1. Safety Information

Use caution and follow all safety guidelines to

prevent electric shock or damage to the meter.

Please ready carefully all instructions before use.

Instrument meets GB/T 13978-92 concerning digital

multimeter standards, along with G4B793.1-1995

(IEC-61010-1,IEC-61010-2-032)safety standards or

electrical measuring instruments with an over-voltage

category of CAT IV 600V,CAT III 1000V.

Follow all safety instructions to ensure safe use and long

life of the instrument.

1.1 Preparation

1.1.1 When using the meter, follow all standard safety

guidelines:

- For universal protection again electric shock.

- To prevent the misuse of the instrument.

1.1.2 Check the meter for damage during transit.

1.1.3 Test leads must be in good condition.Check the

insulation and tips before use.

1.1.4 Safety can only be guaranteed with leads provided.

If leads need to be replaced, they must be replaced

with leads of same electrical specifications.

1.2 Using the Meter

1.2.1 Always set the meter to the proper function and

range first.

1.2.2 Never exceed protection limits indicated for each

measurement.

1.2.3 Keep fingers behind the probe barriers while

measuring.

1.2.4 Always be careful when working with voltages

above 60V DC or 30V AC RMS.

1.2.5 Never measure voltages that might exceed 600V

DC/AC above earth ground.

1.2.6 In manual range, if the circuit value is unknown,

start the meter at the maximum range and then

adjust accordingly.

1.2.7 Remove the leads from the circuit first before

switching between functions.

1.2.8 Do not power on circuit while measuring resistance,

capacitance, diodes and continuity.

1.2.9 Never connect the meter’s leads across a voltage

source while the rotary switch is in the resistance,

capacitance, diode or continuity mode.

1.2.10 Do not measure capacitance before capacitors

are discharged.

1.2.11 Do not operate the meter near explosive gas,

vapor or dust.

1.2.12 Stop using the meter if any abnormality is observed.

1.2.13 Do not use the meter unless the battery cover is

securely fastened to the meter.

1.2.14 Avoid direct exposure to sunlight to ensure

extended life of the meter.

03 0 4

1.3 Safety Symbols

1.4 Maintenance

1.4.1 To avoid electric shock or personal injury, repairs/

servicing not covered in this manual should be

performed only by qualified personnel.

1.4.2 Remove test leads from any circuit before opening

battery cover.

1.4.3 To avoid false readings that may become

dangerous, replace the battery as soon as the

ymbol appears.

1.4.4 Clean the meter using a damp cloth and mild

detergent only; do not use abrasives or chemical

solvents.

1.4.5 Always move rotary switch to OFF when not using

the meter.

1.4.6 If meter is not going to be used for an extended

period of time, remove battery to prevent damage

to the meter.

2. Description

-The MS8250D is a portable, hand-held yet professional

meter that features True RMS measurement display,

AC/DC current, AC/DC voltage, Frequency,

Capacitance, Resistance, Continuity, Duty Ratio, Diode

Testing and a USB adapter for recording readings on a

PC. This Meter is easy to use even with one hand, s

uitable for professional users or amateurs, and ideal for

school or home use.

- Both auto and manual range.

- Display hold

- True RMS for AC voltage/current measurements

- Relative measurement

- Maximum measurement

- Minimum measurement

- Display frequency when measuring AC voltage/current

- Automatic Power Off

Important safety information, please refer

to user ’s manual

Caution when testing on live conductors

Double insulation protection (category II)

This meter has met IEC61010-1 standard

with an overvoltage category (600V CAT IV)

and pollution degree 2.

CAT IV

Double insulation protection (category II)

Ground

2.1 Part Name

(1)

(2)

(3)

(4)

(5)

(6)

(7)

USB interface

NCV detection indicator

LCD display

Function buttons

Rotary switch

Input sockets

NCV detection sensor

Complies with U.S. and Canadian safety

standards

05 0 6

2.2 2 Buttons/Input jack description

HOLD: keep current reading on the display

FUNC: switch between functions or AC/DC measurement

RANGE: switch between auto/manual ranges

REL: display relative measurement

MAX/MIN: switch between max/min measurement display

:turn on/off backlight

OFF:Power off position

:input jack for voltage, resistance, capacitance,

diode, continuity, frequency and duty cycle

measurement

:common terminal

: input jack for current measurement (<660mA)

:input jack for current measurement (<10A)

COM

μAmA

10A

VHz%

2.3 LCD display

07 0 8

Alternating current

Direct current

Diode

Continuity

Auto range

Maximum display

Minimum display

Low battery

Percentage (duty cycle)

Hertz, kilohertz (frequency)

Millivolts, volts (voltage)

Micro amps, milliamps, amps (current)

Nanofarad, microfarad, millifarad (capacitance)

Ohms, kilaohms, megaohms

Relative display

AUTO

MAX

MIN

Hz, kHz

mV, V

REL

Ω, kΩ, MΩ

nF, μF, mF

μA, mA, A

3. Specifications

Instrument should be calibrated annually at 18°C~28°C

and relative humidity of <75%.

NCV Non-contact voltage detection

USB interface active

Auto power off

3.1 General Specifications

3.1.1 Auto and manual range

3.1.2 Full range overload protection

3.1.3 Max. voltage between terminal and

ground: 600V DC or AC rms

3.1.4 Operating altitude: 2000m max.

3.1.5 Display: 6600 count LCD

3.1.6 Polarity indication: automatically displays “-”

3.1.7 Over range indication: “OL” or “-OL”

3.1.8 Sample rate: approx. 0.4s/analog bar

graph: approx. 0.04s

except for current measurement: approx.

1s/bar graph: 0.1s

3.1.9 Unit display: functions and unit power

3.1.10 Auto power off time: approx. 15 min.

3.1.11 Power supply: 9V battery

3.1.12 Low battery indication: display shows“ ”

3.1.13 Temp. coefficient: less than 0.1 x accuracy/°C

3.1.14 Operating temperature: 0~40°C

3.1.15 Storage temperature: -10~50°C

3.1.16 Dimensions: 180x86x52mm

3.1.17 Weight: approx. 250g (without battery)

09 1 0

3.2 Technical Indicators

3.2.1 True RMS characteristics

3.2.1.1 For non-sinusoidal signal measurement, the

Meter provides more accurate measurement than

the traditional averaging method.

3.2.1.2 If in AC current mode, the Meter may display a

random reading between 1 and 50 when the input

is not active. This will not affect the accuracy of

measurement.

3.2.1.3 True RMS requires a minimum input level, AC

current or voltage should be 2%~100% of the

maximum level.

3.2.2 DC Voltage

Resolution

0.1mV

Accuracy

±(0.8% reading + 3 digits)of

660mV

0.001V

0.01V

0.1V

6.6V

66V

600V ±(0.5% reading + 5 digits)of

Range

- Input impedance: 10M

- Overload protection: 660mV range: 250V DC or AC rms.

6.6V-1000V ranges: 1000V DC or 1000V AC rms.

- Max. input voltage: 1000V DC

0.1V1000V

3.2.3 AC Voltage

Resolution

0.1mV

Accuracy

±(1.5% reading + 5 digits)

660mV

0.001V

0.01V

0.1V

6.6V

66V

600V

±(1.2% reading + 5 digits)

Range

±(1.5% reading + 5 digits)

- Input impedance: 10MΩ

- Overload protection: 660mV range: 250V DC or AC rms.

6.6V-1000V ranges: 1000V DC or 1000V AC rms.

- Max. input voltage: 1000V DC

- Frequency response: 50 ~ 60Hz

- Response: True RMS

0.1V

1000V ±(1.5% reading + 5 digits)

3.2.4 Resistance

Resolution

0.1Ω

Accuracy

660Ω

0.001kΩ

0.01kΩ

0.1kΩ

6.6kΩ

66kΩ

660kΩ

6.6MΩ

±(0.8% reading + 5 digits)

Range

±(1.5% reading + 5 digits)

- Open circuit voltage: approx. 0.4V

- Overload protection: 250V DC or AC rms.

66MΩ0.1MΩ

0.001MkΩ

11 1 2

3.2.5 Capacitance

Resolution

0.001nF

Accuracy

6.6nF

0.01nF

0.01µF

66nF

66µF

660µF

±(4.0% reading + 5 digits)

Range

- Overload protection: 250V DC or AC (RMS)

0.1µF

0.1nF660nF

6.6µF

6.6mF

66mF

0.001mF

0.01mF

±(3.0% reading + 3 digits)

±(4.0% reading + 5 digits)

3.2.6 Diode Test

Resolution Function

Range

Display approximate diode

forward voltage value

0.001V

- Forward DC current: approx. 1mA

- Reverse DC voltage: approx. 3.3V

- Overload protection: 250V DC or AC rms.

3.2.7 Circuit Continuity Test

Resolution Function

Range

If the resistance of circuit to be

measured is less than 30Ω, the

meter's built-in buzzer will

sound.

0.1Ω

- Open circuit voltage is about 1.2V

- Overload protection: 250V DC or AC (RMS)

3.2.8 Frequency

3.2.8.1 In V mode:

Resolution Accuracy

66Hz

±(1.5% reading + 5 digits)

Range

660Hz

10kHz

0.01Hz

0.1Hz

0.001kHz

0.01kHz

6.6kHz

- Frequency range:10Hz~10kHz

- Input voltage range: >0.2V AC(rms)(as measured

frequency increases,voltage will also increase)

3.2.8.2 Pass Hz grade:

Resolution Accuracy

66Hz

±(1.5% reading + 5 digits)

Range

660Hz

6.6kHz

660kHz

6.6MHz

66MHz

0.01Hz

0.1Hz

0.001kHz

0.01kHz

0.1kHz

1kHz

10kHz

66kHz

- Overload protection:250V DC or AC rms.

- Measurement signal: 3Vpp AC

3.2.8.3 Duty Ratio

Resolution Accuracy

1-99%

Range

0.1% ±2.0%

13 1 4

3.2.9 DC Current

Resolution Accuracy

660µA

±(1.0% reading + 5 digits)

Range

66mA

10A

0.1µA

1µA

10µA

10mA ±(2.0% reading + 5 digits)

6600µA

660mA 100µA

- Overload protection:

µA/mA jack: F 600mA/1000V. A jack: F10A/600V.

- When measuring current larger than 5A, do not continue

measurement for greater than 10s. Wait 1 min. after

measurement before resuming.

3.2.10 AC Current

Resolution Accuracy

660µA

±(1.5% reading + 5 digits)

Range

66mA

10A

0.1µA

1µA

10µA

10mA ±(3.0% reading + 5 digits)

6600µA

660mA 100µA

- Overload protection:

µA/mA jack: F 600mA/1000V. A jack: F10A/600V.

- Frequency response:50 ~ 60Hz

- Response: True RMS

- When measuring current larger than 5A, do not continue

measurement for greater than 10s. Wait 1 min.after

measurement before resuming.

4. Using the Meter

4.1 Data Hold

4.1.1 During measurement, if you want to keep the

reading on the display, press“HOLD”and the

reading will be held.

4.1.2 Press“HOLD”again to release the hold.

4.2 Manual Range

4.2.1 In voltage, current, resistance, capacitance, and

frequency modes, the default range is auto.

4.2.2 Press“RANGE”to switch to manual range.Each

press of the button increases the range, and returns

to the lowest range when pressed in the largest

range.

4.2.3 Hold down“RANGE”for 1 second to return to auto

range.

4.2.4 When in Max/Min modes, pressing“RANGE”to

return to normal measurement.

Note:

Frequency cannot be set to manual range.

4.3 Relative Mode

4.3 1 Press“REL”to enter relative mode.The meter stores

the measured value when the button was pressed

and compares it to the currently measured value

(rel = current reading - stored reading).

4.4 Maximum/Minimum Mode

4.4.1 Press MAX/MIN in any range to show the maximum

value recorded; press“MAX/MIN”again to show the

minimum value recorded; press“MAX/MIN”a third

time to return the display to normal.

“ ”

15 1 6

4.4.1 In voltage and current modes, press“FUNC”to

switch between AC and DC modes.

4.4.1 In the multi-function position, press“FUNC”to switch

between resistance, diode and continuity modes.

4.5 Function Switch

4.6 Backlight

4.7 Automatic 9ower-off

4.6.1 Press “ ” key, turn on or off backlight.

4.7.1 If the meter is not used for 30 minutes, the meter

will automatically turn itself off to save battery power.

4.7.2 To turn the meter back on, press any button.

4.7.3 Holding FUNC when turning on the meter will

disable auto power off.

“ ”

4.9 NCV (Non-Contact Voltage detection)

4.8 USB Communication

4.8.1

4.8.2

4.8.3

Install the included software and USB driver

( See PC CD-ROM software user’s guide) on a PC.

Use the included USB cable to connect the meter

to the PC; the symbol appears on the display.

Open the installed software and the meter will begin

sending the measured data to the software.

4.9.1 Move the rotary switch to the NCV position.

4.9.2 Move the NCV sensor (top of the meter) toward the

object to be tested. If the sensor detects voltage

greater than 110VAC (rms), the NCV indicator will

flash and the meter will beep.

Note:

1.Even without indication, voltage may still exist. Do not

solely rely on NCV detection to determine in voltage

exists. Detection may be affected by socket design,

insulation thickness or other factors.

2.NCV indicator may go off when measuring voltage due

to the presence of induced voltage.

3.Interference sources may accidentally trigger NCV

detector.

4.10 DC/AC Voltage

Voltage is the potential difference between two points.

The polarity of AC voltage changes over time where DC

voltage polarity does not.

DC voltage ranges: 660.0mV、6.600V、.00V、0.0V.

1000V AC voltage ranges: 660mV、6.600V、66.00V、

660.0V. 1000V. 660mV range can only be entered through

manual range.

Measuring DC/AC voltage:

4.10.1 Move the rotary switch to the position.

4.10.2 Connect the red test lead to the V jack and the

black lead to the COM jack.

4.10.3 Connect the leads in parallel with the circuit under

test.

4.10.4 The measured voltage will be displayed. For DC

measurement, the polarity of the red lead will be

indicated.

4.10.5 Press“FUNC” to switch between DC and AC

voltage.

66 66

17 1 8

4.11 Resistance

Resistance ranges: 660.0、6.600k、66.00k、660.0k、

6.600M、660.00M.

To measure resistance:

4.11.1 Move rotary switch to the position.

4.11.2 Connect the red test lead to the Ω jack and the

black lead to the COM jack.

4.11.3 Connect leads to circuit under test.

4.11.4 The measured resistance will be displayed.

4.12 Continuity

While in resistance mode, press “FUNC” to switch to

continuity mode.

4.12.1 Connect the red test lead to the Ω jack and the

black lead to the COM jack

4.12.2.Connect leads to circuit under test.

4.12.3.If the measured resistance is less than 50Ω, the

meter’s buzzer will sound.

4.13 Diode Test

While in continuity mode, press “FUNC” to switch to

diode mode.

4.13.1 Connect the red test lead to the V jack and the

black lead to the COM jack.

4.13.2.Connect leads across the diode under test.

4.13.3.The display shows the approx. forward voltage

drop.

4.14 Capacitance

4.15 Frequency and Duty Cycle

Frequency ranges: 60Hz, 600Hz, 6kHz, 60kHz, 600kHz,

6MHz, 60MHz.

Measuring Frequency:

4.15.1 Move the rotary switch to the Hz% position.

4.15.2 Connect the red test lead to the Hz% jack and the

black lead to the COM jack.

4.15.3 Connect the leads across the circuit under test.

4.15.4 The measured frequency will be displayed.

4.15.5 Press “FUNC” to switch to duty cycle.

4.15.6 Repeat steps 2-4 to measure duty cycle.

4.16 DC/AC Current

Current ranges: 660A, 6600A, 66.00mA, 660.0mA,

10.000A.

4.16.1 Turn off power to the circuit and discharge all

capacitors fully.

4.16.2 Move the rotary switch to the appropriate current

position (µA, mA, or A)

4.16.3 Connect the black test lead to the COM jack.If the

current to be measured is less than 600mA,

connect the red test lead to the µAmA jack.If the

current to be measured is between 600mA and

10A, connect the red test lead to the 10A jack.

Capacitance ranges: 6.6nF、66.00nF、660.0nF、

6.600F、66.00F、66.0F、6.600mF and 66mF.

Measuring capacitance:

4.14.1 Move the rotary switch to the position.

4.14.2 Connect the red test lead to the jack and the

black lead to the COM jack.

4.14.3 Connect the leads across the capacitor for

measurement

4.14.4 The measured capacitance will be displayed

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