3B SCIENTIFIC PHYSICS AM51 Manuale utente

3B SCIENTIFIC®PHYSICS

Analogue Multimeter AM51 1003074

Instruction sheet

04/15 SD

1 Rotary switch to select

measurement range

2 Rotary knob to set full-scale

deflection for 0 Ω

3 Connection for voltage

measurement

4 Connection for current and

resistance measurement

5 Connection for ground

6 Adjustment screw for

mechanical zero-point

setting

7 Nub to latch the housing

shut

1. Safety instructions

•Before using the analogue multimeter, make

sure you read the operating instructions

carefully and that you comply with them

completely.

•The safety of the multimeter and the person

operating it can only be guaranteed if it is

used in accordance with the instructions. Do

not operate or handle this unit incorrectly or

inappropriately.

•The device may only be used by persons,

who are aware of the hazards of contact (for

voltages over 30 V rms) and can undertake

the appropriate safety precautions. This also

includes the appearance of unforeseen volt-

ages e.g. in defective units or charged ca-

pacitors.

This multimeter is not a toy and must not fall into

the hands of children.

•Do not place it, keep it or use it anywhere

within reach of children.

•When the multimeter is used by teenagers,

trainees etc., a suitable person should super-

vise to ensure the equipment is used safely.

•If measurements are made where there are

any risks of coming into contact with elec-

tricity, a second person is to be informed.

•Be particularly careful when measuring volt-

ages in excess of 33 V AC (RMS) or 70 V

DC.

•For voltages which are in excess of 33 V AC

or 70 V DC, only use safety measurement

leads conforming at least to CAT II.

•In the case of voltage and current measure-

ments the nominal voltage between the

phase and neutral conductor may not exceed

300 V according to CAT II (in circuits that are

directly connected to the mains) and CAT III

(in building wiring installations) 300 V.

•The analogue multimeter may not be used

for measurements in circuits with corona

discharge (high voltage).

•In measurements involving RF circuits spe-

cial care must be taken due to the existence

of dangerous hybrid voltages.

•The appropriate permissible measurement

range may not be exceeded. Always change

from a higher measurement range to a lower

measurement range.

•Before using the device, check the housing

and the measurement cables for any damage.

•The multimeter may only be used in a dry,

dust-free environment with no risk of explo-

sions occurring. Workplace, hands, shoes

and floor must be dry.

•Before opening the housing all measure-

ment leads are disconnected from the de-

vice.

•Do not dispose of the battery in the regular

household garbage. Follow the local regula-

tions.

1.1 Symbol legend

Hazard, read instruction sheet

VVoltage

ACurrent

Moving coil galvanometer

AC/DC quantities accuracy class 2,5

Use in horizontal position

DC quantities

AC quantities

CAT Measuring category as per IEC EN

61010-1

Double insulated casing

CE EU conformity mark

Earth symbol

┴Ground symbol

Battery symbol

2. Description

Handheld meter used to measure current, volt-

age and resistance as well as gain levels or

attenuation e.g. in chains of quadripoles.

Passive analog multimeter with a rotary switch

for selecting the measurement ranges and a

scale with mirrored background for parallaxfree

readings. The device is extremely robust in

terms of load capacity and is equipped with ex-

cellent overload protection due to its two anti-

parallel diodes as well as moving coil move-

ment, which is not sensitive to external electro-

magnetic fields. The safety connection sockets

offer protection against accidental touch contact.

The robust plastic housing and the spring-

connected bearing jewels of the movement

guarantee protection against damage caused by

mechanical stress.

3. Technical data

Measurement ranges:

Voltage measurement:

Measurement range Internal resistance

100 mV 2 kΩ

1 V 20 kΩ

10 V 200 kΩ

30 V 600 kΩ

100 V 2 MΩ

300 V 6 MΩ

600 V 12 MΩ

Measurement range Internal resistance

10 V 66.7 kΩ

30 V 200 kΩ

100 V 667 kΩ

300 V 2 MΩ

600 V 4 MΩ

Current measurement:

Measurement range Voltage drop

50 µA 100 mV

1 mA 500 mV

10 mA 500 mV

100 mA 500 mV

1 A 590 mV

Measurement range Voltage drop

3 mA 1.5 V

30 mA 1.6 V

300 mA 1.6 V

3 A 1.8 V

Widerstandsmessung:

Rotary

switch

Measurement range

and scale centre

Max. meas.

current

Ωx 1 1 Ω...35 kΩ...5 kΩ45 mA

Ωx 10 10 Ω...350 kΩ...50

kΩ

4.5 mA

Ωx 100 100 Ω...3.5 kΩ...500

kΩ

0.45 mA

Accuracy:: Class 2.5

Influencing variables and nominal operating

ranges:

Temperature 0 – 40° C: ± 1% / 10 K for DC

± 2.5% / 10 K for 100 mV/50 µA DC

± 1.5% / 10 K for AC

Frequency (30 Hz...1 kHz): ± 2.5%

Reference conditions:

Ambient temperature: + 23° C

Frequency: 50...60 Hz

Waveform: Sinusoidal

Environmental conditions:

Ambient temperature: 5°C...23°C…40°C

Storage temperature: -20…70°C

Relative humidity: <85% with no con-

densation

Shock tests: max. 147 m/s²

Electrical safety:

Safety stipulations: EN 61010-1

Overvoltage category: CAT III max. 300 V;

CAT II max. 600 V

Degree of pollution: 2

Protection class: II

Protection type: IP20

Overload protection: Fuse FF 3, 15 A /

600 V (IEC127 6.3

x 32 mm)

Breaking capacity:

1.5 kA

Recommended type:

SIBA: 7012540.3.15

Electromagnetic compatibility:

Jamming:: EN 500081-2

Interference immunity: EN 500082-2

Power supply:: 1 x 1.5 V Battery

IEC LR6

Connectors: 4-mm safety sock-

ets

Scale length: 85 mm

Pointer deflection: 0…100°

Operating alignment: horizontal

Dimensions:: 98x138x35 mm

Weight: approx. 0.25 kg

4. Operation

4.1 Readying for use

•Insert battery into the battery compartment.

To do this open the appropriate section of

the housing by pressing in the nub (7), e.g.

using a screwdriver. Then insert the battery

and connected it to the battery clip. Replace

the section of housing and snap it into place.

•Check the mechanical zero-point. The

measuring instrument may not be connected

to anything at this time. The needle must be

located in the zero-point position when the

multimeter is in a horizontal position. If nec-

essary make the corresponding adjustments

by means of the adjustment screw (6).

•Check the full scale deflection setting for 0 Ω.

To do this set the rotary switch (1) to “x 1

Ω”. Shortcircuit the connection sockets

“COM” (5) and “A, Ω” (4). Set the full scale

deflection by turning the knob (2).

•If full scale deflection cannot be set or the

needle no longer stays still, the battery must

be replaced.

4.2 General instructions

•When performing measurements always set

the rotary switch (1) to the highest meas-

urement range. Then turn to lower ranges

until the optimum needle deflection is ob-

tained.

•When the multimeter is not in use, discon-

nect all measurement leads from the meter,

reset the rotary switch (1) to the highest

range and, if necessary, remove the battery.

4.3 Voltage measurement

4.3.1 DC voltage up to 100 mV

•Set the rotary switch (1) to the measurement

range “50 μA, 100 mV”.

•Connect the multimeter and take a reading

from the V, A DC scale.

4.3.2 DC voltage up to 600 V

•Using the rotary switch (1) select the corre-

sponding measurement range “600,...,1 V

DC”.

•Connect the multimeter and take a reading

from the V, A DC scale.

4.3.3 AC voltage up to 600 V

•Using the rotary switch (1) select the corre-

sponding measurement range “600,...,10 V

AC”.

•Connect the multimeter and take a reading

from the V, A AC scale.

4.4 Current measurement

•When taking any current measurements

connect the multimeter in series to the load

in the circuit, which has the least potential

with respect to ground.

•Measurements conducted in the 3 A range

may not take longer than 1 min.

4.4.1 Direct current up to 1 A

•Using the rotary switch (1) select the corre-

sponding measurement range “1 A,...,50 μA

DC”.

•Connect the multimeter and take a reading

on the V, A, DC scale.

4.4.2 Alternating current up to 3 A

•Using the rotary switch (1) select the corre-

sponding measurement range “3 A,..., 3 mA

AC”.

•Connect the multimeter and take a reading

on the V, A, AC scale.

4.5 Measuring resistance

•Using the rotary switch (1) select the corre-

sponding measurement range “x 100 Ω,..., x

1 Ω”.

•Connect the multimeter and take a reading

on the Ωscale.

•When performing measurement on semi-

conductors use the following terminals: posi-

tive pole connected to “COM” and negative

pole connected “A A, Ω”.

•Resistance measurement is carried out us-

ing the DC voltage from the battery being

used. Since the battery is under extreme

loading during measurements in the “x 1 Ω”

range, the measurement should only be of a

brief duration.

•Only measure zero-voltage elements due to

the fact that external voltages falsify meas-

ured values.

•When resistances measurements are car-

ried out involving longer periods and switch-

over to other measurement ranges is com-

plete check for 0 Ωfull scale deflection and

adjust, if necessary.

4.6 Attenuation and gain measurement

•In communications engineering the gain or

attenuation of a signal is specified in deci-

bels as the logarithm of the ratio between

the measured voltage and a defined refer-

ence voltage. Positive values correspond to

a gain and negative values reflect attenua-

tion. The reference voltage of the multimeter

amounts to 0.775 V (= 1 mW at 600 Ω). With

this voltage there is a gain of 0 dB.

•Using the rotary switch (1) select the corre-

sponding measurement range “600,..., 10 V

AC”.

•Connect the multimeter and take a reading

on the dB scale.

•Since this scale is only valid for the 10 V

measurement range, in the other measure-

ment ranges a relative constant must be

added to the value obtained from the scale:

Measurement range Constants

30 V 10 db

100 V 20 db

300 V 30 db

600 V 36 db

5. Maintenance

5.1 Storage, cleaning

•Keep the equipment in a clean, dry and

dust-free place.

•Only use a paintbrush or soft towel to clean

the multimeter. If static electrical charging

occurs on the view window this can be

eliminated using a damp rag or an antistatic

agent.

5.2 Battery

•Test the battery from time to time. If it is

dead or it has started to decompose, it must

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com

Subject to technical amendments

be removed from the device. The battery is

replaced in accordance with 4.1.

•If the multimeter remains idle over a long

period of time, the battery should be re-

moved from the unit.

•Do not dispose of the

battery in the regular

household garbage.

Follow the local regu-

lations (In Germany:

BattG; EU:

2006/66/EG).

5.3 Replacing the fuse

•The multimeter is equipped with a safety

fuse FF 3, 15 A / 600 V, breaking capacity

1.5 kA. To replace the fuse the device must

be opened as described in section 4.1. Re-

move the fuse and replace it with a fuse of

identical type. Then replace the section of

housing and snap it back into place se-

curely.

6. Disposal

•The packaging should be disposed of at

local recycling points.

•

Should you need to

dispose of the equip-

ment itself, never

throw it away in normal

domestic waste. Local

regulations for the dis-

posal of electrical

equipment will apply.

•Do not dispose of the battery in the regular

household garbage. Follow the local regula-

tions (In Germany: BattG; EU: 2006/66/EG).

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