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Rolls MU118 Digital Multimeter User Manual

Rolls digital multimeter mu118 operation manual

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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 0.1

to 200M

.

* 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)

100

μ

V

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: 10M

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)

10

μ

A

200mA

±(1.2% of rdg + 2d)

100

μ

A

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)

10

μ

A

200mA

±(1.8% of rdg + 3d)

100

μ

A

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

200

±0.8% of rdg ± 3d

0.1

2k

±0.8% of rdg ± 2d

1

20k

10

200k

100

2M

1k

20M

±1% of rdg ± 5d

10k

200M

±[5% of (rdg -1M

) +10d]

10k

On 200M

range, 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
n

-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

1

/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/

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