3B Scientific 1017895 Demo Multimeter Instructions

: June 9, 2024
: 3B Scientific

3B Scientific 1017895 Demo Multimeter

3B-Scientific-1017895-Demo-Multimeter-product-image

Description

The demo-multimeter is an electronic meter featuring a double scale for analog measurement of current and voltage in demonstration experiments. It is suitable for use as a free-standing instrument or for setting up in training panel frames.
The meter can handle measurements of current and voltage values and also allows the zero point to be set up in the centre of the scale for measurement of DC quantities. All the possible measuring ranges can be selected by means of a sin-le rotary switch.
This equipment is protected by fuses and authorised for making measurements in circuits directly connected to the low-voltage mains via plugs (CAT II), i.e. for measurements on house-
hold appliances, for example. The current measuring ranges are resistant to long-term overloading up to 10 A. Generous protection of all the cur-rent ranges by means of semiconductor circuit breakers prevents the fuse blowing unintentionally in many cases.
Switching between measuring ranges does not break any circuits connected to the equipment. This means it is possible to carry out measure-ments on voltage converters, for example, with-out causing induction surges. Resistance R, con- ductance G, impedance Z and admittance Y can easily be determined as quotients of current and voltage measurements thanks to the non-inter-rupting switch capability without the need to change the wiring.

Safety instructions

The demo multimeter conforms to safety regula-tions for electrical measurement, control and la-boratory equipment, as specified in DIN EN 61010-1, protection class 2 and to measuring cat-egory CAT II for up to 600 V. The nominal voltage between the phase conductors and the neutral for voltage and current measurements (in circuits di-rectly connected to mains electricity) must not ex-ceed 600 V in order to conform to CAT II.
The meter is intended for measurements within its measuring ranges and in a measuring environ-ment as described in detail in the course of this manual. Safe operation of the multimeter is guar-anteed if it is solely used as specified. Safety can-not be guaranteed, however, if the multimeter is used incorrectly or handled without due care and attention. In order to avoid serious injury due to current or voltage shocks, the following safety in- structions are to be observed at all times.
The multimeter may only be used by persons who are able to recognise the risks of contact and take due precautions to avoid them. Voltages in ex-cess of 33 V AC (RMS) or 70 V DC are to be re-garded as actively dangerous if the current, charge or energy stored should exceed certain values (see DIN EN 61010-1).

Carefully read the instruction manual before using the multimeter and obey the instruc-tions therein.
The multimeter may only be used in a dry, dust-free environment with no risk of explo-sions occurring.

The assumption needs to be made that unfore-seen voltages may be present in the vincinity of objects being measured (e.g. faulty equipment).

Before using the multimeter, check the housing and measuring leads for damage and if there should be any malfunctions or visible damage, the multimeter is not to be used. Pay specific attention to the insulation for the measuring sockets.
The multimeter may not be used to make measurement on circuits which exhibit corona discharge (high voltage).
Particular care is to be taken when making measurements on high-frequency circuits where dangerous voltages may arise due to superimposition of components.
The authorised measuring range is not to be exceeded. If measurements are made when the magnitude of the variable is unknown, al-ways select a large measuring range before shifting down to lower ones.
Make very sure that the voltage value be-tween the measured contact and earth or be-tween the ground socket and the measure-ment socket does not exceed 600 V.
Before using the analogue multimeter to check that a voltage source is not exhibiting any actual voltage, check that the meter is working properly by selecting the battery test function.
When measuring current, make sure the electricity is turned off before the analogue multimeter is connected into the circuit.
When making measurements, always connect the ground lead first. Disconnect the signal measurement lead before unplugging the ground.
Turn off the multimeter before opening the casing, disconnect the power to the circuit and the measuring leads from the multimeter.

If measurements are made where there are any risks of coming into contact with electricity, a sec-ond person is to be informed.

The demo-multimeter should not be stored, set up or operated 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 to be made where volt-ages exceed 33 V AC (RMS) or 70 V DC, be especially careful and only use safety experi-ment leads.

Measuring categories according to DIN EN 61010-1.
CAT I or unstipulated: Approved for measure-ments in circuits which are not directly connected to the low voltage mains grid (e.g. batteries).
CAT II: Approved for measurements in circuits which are directly connected, by a mains lead and plug for instance, to the low voltage mains grid (e.g. household or office appliance and lab equipment).
CAT III: Approved for measurements in circuits which are part of a building’s wiring installation (e.g. stationary consumers, distribution terminals, appliances connected directly to the distribution box).
CAT IV: Approved for measurements in circuits which are directly connected to the source of the low voltage mains (e.g. electricity meters, main service feed, primary excess voltage protection).

Technical data

Display:

Scales: 0 … 10, linear 0 … 3, linear
Scale length: 160 mm
Pointer deflection: 0…90°
Electrical zero-point offset: in all DC ranges

Measurements:

Voltage ranges: 0.1/ 0.3/ 1/ 3/ 10/ 30/ 100/ 300/ 600 V AC/DC
Current ranges: 0.1/ 0.3/ 1/ 3/ 10/ 30/ 100/ 300 mA AC/DC 1/ 3/ 10 A AC/DC
Input resistance: 1 MΩ AC/DC Voltage drop when
measuring current: 100 mV approx. AC/DC

Reference conditions:

Ambient temperature: 23 °C
Operating alignment: Vertical
Signal form: Sine (1% max. discrepancy)
Peak factor: 2
Frequency range: 40 Hz … 50 Hz … 5 kHz

Accuracy (at reference conditions):

DC quantities: Class 2
DC with zero-point offset: Class 5
AC quantities: Class 3
Extended frequency range (class 10):
3 – 600 V: 40 Hz … 50 Hz … 40 kHz
0,3 – 1 V: 40 Hz … 50 Hz … 10 kHz
0,3 – 3000 mA: 40 Hz … 50 Hz … 40 kHz
10 A: 40 Hz … 50 Hz … 40 kHz
Resistance, conductance, impedance, admittance
These quantities can be determined by forming various quotients involving “simultaneous measurements” of current and voltage.
R = U / I: below 1 mΩ … above 10 MΩ
S = I / U: below 1 μS … above 30 S
Z = U / I: below 1 mΩ … above 10 MΩ,
40 Hz … 40 kHz
Y = I / U: below 1 μS … above 30 S,
40 Hz … 40 kHz

Overload protection:

Voltage ranges: 600 V long-term in all voltage ranges
Current ranges: 10 A of long-term loading in 3-A and 10-A ranges

Electrical safety:

Safety specifications: EN 61010-1
Measuring category: CAT II: 600 V
Contamination level: 2
Protection type: IP20
Connectors: 4-mm safety sockets

Protection:

Fuses: 2x FF 10 A/600 V (10 x 38 mm)
Breaking capacity: at least 10 kA
3B order number: 5008564

Power supply:

Battery: 1x 1.5 V, AA IEC LR6
Automatic cut-off after: 45 min ± 10 min

Electromagnetic compatibility:

Interference emission: EN 55011:2009
Interference resistance: EN 61326-1:2013

Operating conditions:

Ambient temperature: 5 °C … 23 °C … 40°C
Storage temperature: -20 … 70°C
Relative humidity: <85% with no condensation

General data:

Shock test: max. 147 m/s²
Height: 297 mm
Dimensions: 259 x 297 x 125 mm3
Weight: 1,7 kg approx.

Control elements

Front

Display
Slotted screw for zero calibration
Toggle switch 1 Zero point centre / left
Calibration trimmer for setting centre zero point
Rotary switch to select the meas-urement range
Ground socket
Current measurement socket for up to 3 A
Current measurement socket for up to 10 A
Voltage measurement socket
Toggle switch 2 AC / DC voltage measurements
Power switch

Rear

Cover plate for battery and fuses
Rating plate
Fuse diagram
Lower edge
Feet

Symbol legend

Display

Hazard, read instruction sheet
Moving coil galvanometer
Apparatus with electronic amplifier
DC quantities accuracy class 2
AC quantities accuracy class 3
Use in vertical position
Dial position when turned off
Dial position for battery test when battery charge is satisfactory

Front

Meter on
Meter off
AC measurements
DC measurements
Zero point centre
Zero point left
Battery test
Ground symbol

Rear

EU conformity mark
Earth symbol
Electrical safety assured by double insulation
Do not dispose in normal domestic waste
For use indoors only
Electric fuse

Initial calibration

Set up the demo multimeter vertically.
Do not connect measuring leads to begin with.
Set the toggle switch 1 to
Set the power switch to

The needle will point to the zero point of the scale on the left. If it does not, the amount of charge of the battery should be checked.

Operation

To switch on:

Set the power switch to

Checking battery charge:

Turn on the demo-multimeter.
Disconnect all measuring leads.
Set the toggle switch 2 to
Set the rotary switch to

If the battery is sufficiently charged, the needle will point to the following range indication,
. If this is not the case, the battery will need to be replaced immediately.

Zero point calibration:

Turn on the demo-multimeter.
Turn the rotary switch to 600 V.
Connect the common/ground socket and the voltage measurement socket together by means of a short connecting lead.
Turn the zero-point trimmer screw to adjust the zero point as needed.

Zero point calibration for centre zero point:

For measurements of DC current and voltage, the zero point of the scale can be moved to the centre of the dial. For this purpose the scales are la-belled with red numbers..

Turn on the demo-multimeter.
Disconnect all measuring leads.
Set the toggle switch 2 to
Set the toggle switch 1 to
Use the zero-point trimmer to line up the needle precisely in the centre of the dial (red di-vision).

To switch off:

Set the power switch to

Set the four-way switch to .
When the meter is turned off, the needle points to

If a measurement is interrupted by battery cut-out

After 45 minutes of use, the multimeter is automatically shut off and the needle will then point to

To switch back on:

Set the power switch of the multimeter to off and then use it to turn the meter back on.

Current measurements up to 3 A

The demo-multimeter may NOT be used for direct measurements on a building’s electrical wiring installation or directly at the source of the mains voltage feed to the junction box. See page 2 of “Measurement categories” as specified in DIN EN 61010-1.

The nominal voltage of the current source may not exceed 600 V.

The multimeter is to be connected in series with the load on the side where the voltage with respect to ground is lowest!
Turn off the circuit before meter is connected into it.
If measurements are made when the magnitude of the variable is unknown, always select a large measuring range before shifting down to lower ones.
Connect the terminal at the lower potential to the common/ground socket.
Connect the common/ground lead first and only then the signal lead.

DC currents up to 3 A

Set the toggle switch 2 to

Alternatively, if measurements are to be made with the zero point in the centre, then set the toggle switch 1 to .
Select the required current measuring range to a range measured in mA or A.

AC currents up to 3 A

Set the toggle switch 2 to
Select the required current measuring range to a range measured in mA or A.

Current measurements up to 10 A

The demo-multimeter may NOT be used for direct measurements on a building’s electrical wiring installation or directly at the source of the mains voltage feed to the junction box. See page 2 of “Measurement categories” as specified in DIN EN 61010-1.

The nominal voltage of the current source may not exceed 600 V.

The multimeter is to be connected in series with the load on the side where the voltage with respect to ground is lowest!
Turn off the circuit before meter is connected into it.
Set up a measuring range of 10 A.
Connect the terminal at the lower potential to the common/ground socket.
Connect the common/ground lead first and only then the signal lead.

DC currents up to 10 A

Set the toggle switch 2 to
Alternatively, if measurements are to be made with the zero point in the centre, then set the toggle switch 1 to .

AC currents up to 10 A

Set the toggle switch 2 to

Voltage measurements

The demo-multimeter may NOT be used for direct measurements on a building’s electrical wiring installation or directly at the source of the mains voltage feed to the junction box. See page 2 of “Measurement categories” as specified in DIN EN 61010-1.
The nominal voltage of the voltage source may not exceed 600 V.

If measurements are made when the magni-tude of the variable is unknown, always select a large measuring range before shifting down to lower ones.
Connect the common/ground lead first and only then the signal lead.

DC voltages up to 600 V:

Set the toggle switch 2 to

Alternatively, if measurements are to be made with the zero point in the centre, then set the toggle switch 1 to .
Select the required measuring range to a range measured in V.
For measurements of voltage up to 100 mV, set the rotary switch to the range 0.1 mA/100 mV.

AC voltages up to 600 V:

Set the toggle switch 2 to

Select the required measuring range to a range measured in V.
For measurements of voltage up to 100 mV, set the rotary switch to the range 0.1 mA/100 mV.

Measuring current and voltage together

The demo-multimeter may NOT be used for direct measurements on a building’s electrical wiring installation or directly at the source of the mains voltage feed to the junction box. See page 2 of “Measurement categories” as specified in DIN EN 61010-1.

The nominal voltage of the current source may not exceed 600 V.

The multimeter is to be connected in series with the load on the side where the voltage with respect to ground is lowest!
Turn off the circuit before meter is connected into it.

DC voltages and currents:

Set the toggle switch 2 to

Use the rotary switch to set the desired volt-age measuring range and read off the meas-urement.
Set a suitable current measuring range and read off the measurement.

AC voltages and currents:

Set the toggle switch 2 to

Use the rotary switch to set the desired volt-age measuring range and read off the meas-urement.
Set a suitable current measuring range and read off the measurement.

Battery and fuses

The demo-multimeter has a compartment which houses both the battery and fuses and which is accessible at the rear once its cover is opened.
One fuse each is provided for the 3 A and 10 A sockets:
FF10 A/600 V, breaking capacity: at least 10 kA (3B order number: 5008564)
The polarity is indicated by plus and minus signs inside the fuse holder compartment. A mechani-cal system ensures the battery makes no contact if it is inserted the wrong way round.

Battery and fuse compartment

Battery testing

Batteries which are discharged and have not been used for a while may leak.

Check the amount of charge left in the battery from time to time.
Flat or leaking batteries should be removed from the meter.

If the demo multimeter goes unused for a long period:
Remove the meter’s battery be-fore reusing.

Changing the battery

Before opening the casing:

Turn off the demo multimeter.
Disconnect all measuring leads.

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