Rolls MU118 Manual

Rolls Ikke kategoriseret MU118

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Side 1/2

ROLLS DIGITAL MULTIMETER

MU118 OPERATION MANUAL

1. INTRODUCTION

This instrument is compact, rugged, battery operated, handheld 3

1/2 digit digital multimeter for measuring DC and AC voltage, DC

and AC current, resistance and diode, capacitance, transistor,

continuity test, temperature and frequency.

The dual–slope A-D converter uses C-MOS technology for

auto-zeroing, polarity selection and over-range indication. Full

overload protection is provided. It is an ideal instrument for use in

the field, laboratory, workshop, hobby and home applications.

2. FEATURES

* Push-button ON-OFF power switch.

* Single 30 position easy to use rotary switch for function and range

selection.

* High sensitivity of 100µV.

* Automatic over range indication with the “1” displayed.

* Automatic polarity indication on DC range.

* All ranges fully protected.

* Resistance measurements 0.1Ω to 200MΩ.

* Capacitance measurements 1pF to 20µF.

* Diode testing with 1mA fixed current.

* Transistor hFE test with Ib≈100µA.

* Temperature measurement with or without K type thermocouple.

3. SPECIFICATIONS

Accuracies are ± (% reading + No. of digits)

Operating environment: 23±5℃, less than 75% R.H.

DC Voltage

Range Accuracy Resolution

200mV ±(0.5% of rdg + 3d) 100μV

2V 1mV

20V 10mV

200V 100mV

1000V ±(0.8% of rdg + 3d) 1V

Input impedance: 10M ohm on all ranges.

Overload Protection: 1000V DC or peak AC on all ranges.

AC Voltage

Range Accuracy Resolution

2V ±(0.8% of rdg + 3d) 1mV

20V 10mV

200V 100mV

750V ±(1.2% of rdg + 5d) 1V

Input impedance: 10MΩ on all ranges

Frequency range: 40Hz to 400Hz.

Overload protection: 700V rms or 1000V peak continuous on ac

ranges, except 200mV ac range (15 seconds maximum above

300V rms).

Indication: Average (rms of sine wave)

DC Current

Range Accuracy Resolution

20mA ±(0.8% of rdg + 2d) 10μA

200mA ±(1.2% of rdg + 2d) 100μA

10A ±(2% of rdg + 5d) 10mA

Overload protection: 0.2A/250V fuse. (20A range not fused)

Maximum input current: 20A, 15 sec. max.

AC Current

Range Accuracy Resolution

20mA ±(1% of rdg + 3d) 10μA

200mA ±(1.8% of rdg + 3d) 100μA

10A ±(3% of rdg + 7d) 10mA

Overload protection: 0.2A/250V fuse. (20A range not fused.)

Frequency range: 40Hz to 400Hz.

Maximum input current: 10A, 15 sec. max.

Indication: Average (rms of sine wave)

Resistance

Range Accuracy Resolution

200Ω ±0.8% of rdg ± 3d 0.1Ω

2kΩ ±0.8% of rdg ± 2d 1Ω

20kΩ 10Ω

200kΩ 100Ω

2MΩ 1kΩ

20MΩ ±1% of rdg ± 5d 10kΩ

200MΩ ±[5% of (rdg -1MΩ) +10d] 10kΩ

On 200MΩrange, if short the two test leads, display reading is 10

digits should be subtracted from measurement results.

Capacitance

Range Accuracy Resolution

2nF ±(3% of rdg + 5d)

1pF

20nF 10pF

200nF 100pF

2µF 1nF

20µF 10nF

Temperature

Range Accuracy Resolutio

℃ -50~400℃ ±(1.2% of rdg + 4d) 1℃

400~1000℃ ±(1.9% of rdg + 15d) 1℃

*Using K type thermocouple probe.

Frequency Test

Overload protection: AC 220V rms.

4. GENERAL CHARACTERISTICS

Maximum display: 1999 counts (3

/2 digits) with automatic polarity

indication and eng. unit.

Indication method: LCD display.

Measuring method: Dual-slope integration A-D converter system.

Overrange indication: “1” or “-1” figure only in the display.

Maximum common mode voltage: 500V DC/AC rms.

Reading rate: 2~3 reading per sec. (approximate).

Temperature for guaranteed accuracy: 23±5℃.

Temperature ranges: Operating: 0℃ to 40℃ (32℉ to 104℉)

Storage: -10℃ to 50℃ (14℉ to 122℉)

Power supply: One 9V battery (NEDA 1604 or 6F22 or equivalent).

Low battery indication: to lift of display.

Size: 88 (W) × 170 (D) × 38(H) mm.

Weight: 340g (including battery)

Accessories: Operating manual, set of test leads and thermocouple

(K type, 300℃)

5. OPERATION

1. Check the 9-volt battery by setting the ON-OFF switch to ON. If the

battery is weak, a sign will appear on the display. It is does not

appear on the display, proceed as below. See maintenance if the

battery has to be replaced.

2. The mark or sign next to the test lead jacks is for warning that

the input voltage or current should not exceed the indicated

values. This is to prevent damage to the internal circuit.

3. The function switch should be set to the range which you want to

test before operation.

4. If the voltage or current range is not known beforehand set the

function switch to a high range and work down.

5. When only the figure “1” is displayed, over-range is being indicated

and the function switch must be set to a higher range.

5.1) DC Voltage Measurement

1, Connect the BLACK test lead to the COM jack and the RED test

lead to the V/Ω jack.

2. Set the FUNCTION switch to the “V range to be used and

connect the test leads across the source or load under

measurement. The polarity of the RED lead connection will be

indicated at the same time as the voltage.

”

NOTE:

Do not apply more than 1000V to the input, Indication is

possible at higher voltages but there is danger of damaging the

internal circuit. ridden by true value.

2. Connect the test capacitor to the input socket (not test leads)

nothing the polarity connections when required.

5.2 AC Voltage Measurement

1．Connect the BLACK test lead to the COM jack and the RED test

lead to V/Ωjack.

NOTE: 1．When test individual capacitors, insert the leads into the

two sockets, with “+” (upper socket), “-” (lower socket), at the left

panel. (Capacitors should be discharged before being inserted into

the test jack).

2．Set the FUNCTION switch to the “V range to be used and

connect the test leads across the source or load under

measurement.

”

NOTE:

Do not apply more than 700V rms to the input, indication is

possible at higher voltages but there is danger of damaging the

internal circuit.

5.3) DC Current Measurement

1. Connect the BLACK test lead to the COM jack and the RED test

lead to the mA jack for a maximum of 200mA.

For a maximum of 10A jack, move the red test lead to the 10A jack.

2．Set the FUNCTION switch to the “A range to be used and

connect the test leads in series with the load under

measurement. The polarity at the RED test lead connection will

be indicated at the same time as the current.

”

2．When testing polarized capacitors, for example, the tantalum

type, particular attention must be paid to the polarity

connections. This is to prevent possible damage to the

capacitor.

When testing large capacitances, note that there will be a

certain time lag before the final indication.

Do not connect an external voltage or a charged capacitor

(especially larger capacitors) to the measuring terminals.

5.7 ) Diode Measurement and Continuity Test

1．Connect the BLACK test lead to the COM jack and the RED

test lead to the V/Ω jack. (NOTE: The polarity of the RED test

lead is “+”).

2．Set the FUNCTION switch to the or range and

connect the test leads across the diode under measurement,

display shows the approx forward voltage of the diode.

NOTE:

The maximum input current is 200mA or 10A depending on

the jack used. Excessive current will blow the fuse which must be

replaced. The 10A range is not protected by a fuse. The fuse rating 3．Connect the test leads to two points of circuit, if the resistance is

lower than approx 30Ωbuzzer sounds.

should be 200mA. And no more to prevent damage to the internal

circuit. 5.8) Transistor hFE Test

The maximum terminal voltage drop is 200mV. 1．Set the FUNCTION switch to hFE range.

5.4) AC Current Measurement

1. Connect the BLACK test lead to the COM jack and the RED test 2．Determine whether the transistor is NPN or PNP and locate the

Emitter, Base and Collector leads. Insert the leads into the

proper holes in the socket on the front panel.

lead to the mA jack for a maximum of 200mA.

For a maximum of 200mA, move the red test lead to the 10A jack.

2．Set the FUNCTION switch to the “A range to be used and

connect the test lead in series with the load under measurement.

” 3．The display will read the approximate hFE value at the test

condition base. Current 10µA, Vce 2.8V.

NOTE: 5.9) Temperature Measurement

The maximum input current is 200mA or 20A depending

upon the jack used. Excessive current will below the fuse which

must be replaced. The 20A range is not protected by a fuse. The

fuse rating should be 200mA and no more to prevent damage to

the internal circuit.

1．Measure temperature with K type thermocouple: Set the

function switch to the ℃range and insert the K type

thermocouple plug into K probe socket.

2．Measure ambient temperature without probe: On the same ℃

range, display reading is the ambient temperature in ℃.

The maximum terminal voltage drop is 200mV.

5.5) Resistance Measurement

1．Connect the BLACK test lead to the COM jack and the RED

test lead to the V/Ω jack (Note: The polarity of the RED test lead

is “+”)

5.10) Frequency Test

1．Connect test leads or shield cable to COM and V/Ω jack.

2．Set the FUNCTION switch to HZ range, and connect test

leads or cable across the source or load under

measurement.

2．Set the FUNCTION switch to the “Ω” range to be used and

connect the test leads across the resistance under

measurement. NOTE:

NOTE: 1． Do not apply more than 220V rms to the input,

indication is

1．If the resistance value being measured exceeds the maximum

value of the range selected an over-range indication will be

displayed (“1”) select a higher range. For resistance of

approximately 1MΩ and above, the meter may take a few

seconds to become stable. This is normal for high resistance

readings.

possible at voltage higher than 10V rms, but readings may

be out of specification.

2．In noisy environment, it is preferable to use shield cable for

measuring small signal.

5.11) Auto Power-off (optional function) min

2．When the input is not connected, i.e. at open circuit, the figure

“1” will be displayed for the over-range condition. Automatic Power-off extends the life the battery by turning the

meter off, if no rotary function switch is operated for about 15

minutes. The meter turns back on if either the rotary switch is turned

or the power switch is pressed again.

3．When checking in-circuit resistance, be sure the circuit under

test has all power removed and that all capacitors are fully

discharged. 6. MAINTENANCE

Battery and/or fuse replacement should only be done after

the test leads have been disconnected and power off.

4．200MΩrange open circuit voltage is 3V, display reading is 10

digits when test leads short, this is normal, when measure

10MΩ resistor (on 200MΩ range). Display reading is 20,

measure 100MΩ (on 200MΩrange) display reading is 110.

The 10 digits is a constant and should be subtracted from the

reading.

6.1) 9-volt Battery Replacement

Note the condition of the 9-volt battery using the procedure

described above, if the battery needs to be replaced, open the back

cover remove the spent battery and replace it with the battery of the

same type.

5.6) Capacitances Measurements

1. Before connecting the test capacitor, note the display which may

have readings. Other than zero each time the range is changed.

This offset reading will not affect the accuracy for it can be over

6.2) Fuse Replacement

If the fuse needs replacement, use only 200mA/250V fuse

identical in physical size to the original.

Produkt Specifikationer

Mærke:	Rolls
Kategori:	Ikke kategoriseret
Model:	MU118

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