Conrad VC 350E Operating Instructions Manual

OPERATING INSTRUCTIONS

Digital Multimeter VC 350E

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Multimètre numérique VC 350E

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Digitalmultimeter VC 350E

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Digitale Multimeter VC 350E

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Pagina 136 - 178

Seite 92 - 135

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Imprint

These operating instructions are published by Conrad Electronic GmbH, Klaus-Conrad-Str.1,92240 Hirschau/Germany

No reproduction (including translation) is permitted in whole or part e.g.photocopy, microﬁlming or storage in electronic data processing equipment, without the express written consent of the publisher.

The operating instructions reﬂect the current technical speciﬁcations at time of print. We reserve the right to change the technical or physical speciﬁcations.

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Cette notice est une publication de la société Conrad Electronic GmbH, Klaus-Conrad-Str.1,92240 Hirschau/Allemagne.

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• Continuity checking and diode test

• Measurement of frequency up to 2 MHz max.

• Measurement of temperature from -40°C to +1000°C max.,

-40°F to +1999°F max.

• Measurement in damp areas, outside, or in unfavourable environmental conditions, is not permitted. Unfavourable environmental conditions include:

- wetness or excessive air humidity,

- dust and combustible gases, vapours or solvents,

- strong vibrations,

- strong magnetic ﬁelds, as in the vicinity of machines or louds-

peakers,

- static electricity (ﬁelds and discharges).

Any use other than the one described above can lead to damage to the product, and can also cause hazards, such as, for example, short-circuit, ﬁre, electric shock, etc.. No part of the product must be modiﬁed or converted!! Safetyinformation must be observed!

2. Introduction, presentation

This multimeter is equipped with several special features, which usefully expand certain measurements: a second, smaller 41/2-position display for the simultaneous display of a set value and the present measurement value, a measurement value store with memory for up to 8 measurement values, a comparison function for comparing measurement values, etc. The instrument has an AUTO RANGE feature, such that with different measurements the appropriate measuring range is always set. The REL function allows reference value measure-ments, in which the difference value is displayed in the small display and the

Digital Multimeter VC 350E

Attention! You must read this!!

Please read this user manual thoroughly. In the event of damages which arise due to non-observance of the User Manual, any guarantee claim will be void. Non-observance of the manual may also result in danger to the user!! We accept no liability for consequential damage which results from this. Keep this User Manual in a safe place .

List of contents

Page

1. Intended use..............................................................................2

2. Introduction, presentation........................................................3

3. Safety information....................................................................4

4. Description of the operating elements....................................8

5. Using the multimeter..............................................................10

6. Performing measurements .....................................................27

7. Maintenance and calibration..................................................40

8. Technical data and measuring tolerances..............................41

1.Intended use of the measuring device

• Measurement of direct voltages up to a maximum of 1000 VDC

• Measurement of AC voltages up to 750 VAC max.

• Measurement of direct and alternating currents (True rms) up to max. 20 A (protected)

• Measurement of resistances up to max. 40 MΩ, in 7 stages.

• Measurement of capacity up to 400 uF max.

• Current measurements may only be carried out in circuits which are themselves fused at 16 A or in which no voltage greater than 250 VDC/VAC rms or powers greater than 4000 VA can arise. The measuring device must not be used in installations of overvoltage category III in accordance with IEC 664. The measuring device and instrument leads are not protected against arc explosions (IEC 1010-2-031, Section 13.101). The unit may be used ungrounded with up to 750 VAC or 1000 VDC between V/Ohm and COM only in Overvoltage category II installations per IEC 664.

• Measuring devices and their accessories are not toys and do not on any account belong in children's hands!

• In industrial facilities the accident prevention regulations of the Industrial Employers' Liability Association for electrical systems and equipment must be observed.

• In schools, training facilities, hobby and self-help workshops, the handling of measuring devices must be supervised responsibly by trained personnel.

• When opening covers or removing components, except where this can be performed manually, live parts may be exposed. Connection points may also be live. Before any adjustment, maintenance, repair or replacement of components or assemblies, the device must be disconnected from all voltage sources and circuits if it is necessary to open the device. If an adjustment, a maintenance task or repair is subsequently required on the opened device while it is live, these must only be performed by a specialist who is familiar with the associated hazards and relevant regulations (VDE-0100, VDE-0701, VDE-

0683).

• Capacitors in the device may still be charged, even when the device has been isolated from all voltage sources and circuits.

actual measured value in the large display. With the COMP function, comparative measurements can be carried out, during which upper and lower limit values can be entered. The MEM (Memory) and RCL (Recall) functions allow up to 8 measurement results to be stored or recalled. An Auto Power Cut Off function switches the DMM into stand-by after approx. 12 minutes, to avoid draining the battery unnecessarily. The multimeter can be switched on again by setting the rotary switch ﬁrst to "Off" and then to the desired position again. The DMM can be used universally in the hobby area as well as in industrial, education and other ﬁelds.

3. Safety information

• CE-identiﬁcation: The VC 350E digital multimeter is EMC tested and complies with guideline 89/336/EEC; in addition, it is AC tested and complies with the low voltage guideline 73/23/EEC.

• This instrument is constructed and tested in accordance with DIN 57 411 part 1/VDE 0411 part 1, safety precautions for electronic measuring instruments or IEC 1010-1 and left the factory in sound, technically-safe condition. To maintain this condition and to guarantee safe operation, the user must comply with the safety instructions and warning notices ("Attention!" and "Note!") contained in these directions for use. The following symbols must be observed:

= Attention! Dangerous voltages! Danger to life!

= Read the user's manual

CAT II = Overvoltage category II

= Safety class II

• Before each change in measuring range the test probes must be removed from the test object.

• Before each measurement check your measuring device and instrument leads for damage.

• Only use the instrument leads which are enclosed with the measuring device for measurement. No others may be used.

• To avoid electric shock, care should be taken that the test probes and the measurement connections (test points) are not touched during measurement, not even indirectly.

• The voltage between a chosen 4-mm socket of the instrument and ground may not exceed 600 VDC/VAC rms.

• The measuring instrument should not be used in spaces or under adverse environmental conditions, in which inﬂammable gas, steam or dust are present or can occur. For the user's own safety it is essential to prevent the measuring instrument or test leads becoming damp or wet. Avoid operation in the immediate vicinity of

a) strong magnetic ﬁelds (loudspeakers, magnets) b) electromagnetic ﬁelds (transformers, motors, coils, relays,

contactors, electromagnets, etc.)

c) electrostatic ﬁelds (charges/discharges) d) transmission aerials or HF generators

• Do not use the multimeter shortly before, during or shortly after a thunderstorm (lightning strike!/high energy over-voltages!)! Care should be taken that hands, shoes, clothing, the ﬂoor , the measuring instrument and test leads, switches and circuits etc. are absolutely dry.

• When effecting replacements, you must ensure that only fuses of the speciﬁed type and the speciﬁed current rating are used. The use of patched fuses or bridging of the fuse socket is not permissible. To change the fuses, disconnect the measuring device from the circuit and switch it off. Remove all connected leads and test probes. Select a suitable cross-head screwdriver and carefully open the housing. In addition the sockets cover must be removed. The disassembly of the sockets cover is described with diagram under "5.1.1 Battery replacement". Remove the defective fuse(s) and replace with fuse(s) of the same type and current rating..

0,8 F 250.8 A/250 V or F800 mA/250 V or, for the A range, 20 A quick-acting 250 V; standard designation: F 0.8 A/250 V or F800 mA/250 V or, for the A range, 20 A quick-acting 250 V; standard designation: F20 A/ 250 V.

When the fuse change has been completed, carefully close and bolt the housing in the reverse order. Only use the measuring device when the housing has been safely closed and bolted.

• Take particular care when dealing with voltages greater than 25 V alternating (AC) or greater than 35 V direct voltage (DC). Even at these voltages you can receive a lethal electric shock if you touch electrical conductors. Therefore, ﬁrst of all switch off the current of the voltage source, connect the measuring device to the connections of the voltage source to be measured, set the required voltage measuring range on the measuring device and then switch the voltage source on again.

After the measurement has been completed, switch off the voltage source and remove the instrument leads from the voltage source connections.

• Before each voltage measurement ensure that the measuring device is not located in the current measuring range.

2c COMP This button switches on the comparison measure-

ment function.

2d Blue button for switching from the measurement of DC to

AC units (while measuring V, uA, mA and A) or also, in the switch position " / ", from diode test to acoustic continuity checking.

2e REC With this button the Auto-Hold function "A-H" and

the minimum (= MIN) and maximum (= MAX) value memory is switched on.

2f R-H With this button it is possible a) to leave the function

under 2e or b) to switch off the automatic ranging and set the desired measurement range by hand or c) to change set values downwards.

2g MEM With this button, up to 8 different measurement

results can be stored independently of the measurement function (V , A, etc.). The values in memory are, however, erased as soon as the measuring instrument is turned off.

2h RCLL With this button, measurement results stored under

"MEM" can be called up consecutively.

3. Rotary switch for setting the different operations (voltage measurement, current measurement, etc.)

4. 20 A input This measurement input is protected with a 20 A fuse and is intended for DC and AC currents up to 20 A max.

5. uA / mA input This input is for measuring direct and alternating currents up to max. 400 mA.

• When safe operation is thought no longer possible, the instrument should be placed out of service and unintentional operation prevented. It is to be assumed that safe operation is no longer possible, if

- the device shows visible signs of damage,

- the device no longer functions and

- after extended storage under adverse conditions

- after severe transportation stress.

• Never switch the measuring device on immediately after it has been brought from a cold into a warm area. The resulting condensation water could damage your device. Allow the instrument to reach room temperature before switching it on.

4. Description of the operating elements

Figure see fold-out page side

1. 3 3/4-position LCD (liquid crystal display), reading 3999 max. (4 1/2-position with frequency measurement; resolution 19999

max.; with 4 1/2-position "small" displays). Analogue bar graph display, various measurement units and symbols.

2. Pushbutton area for special-function buttons 2a Yellow button for switching from current measurement (mA

or A) to temperature measurement (°C from mA; °F from A). With the button in the switch position " / " fuses ("FUSE") can also be tested.

2b REL With this button, on the one hand the reference

value measurement is switched on and on the other hand set values can be adjusted upwards.

Attention!

Do not in any event operate the measuring device when it is open! Danger to life! Do not leave used batteries in the measuring instrument, because even leak-proof batteries can corrode and thereby release chemicals, which are both damaging to health and can destroy the battery compartment. Used batteries are to be regarded as waste requiring special handling and so do not belong with general refuse. Used batteries must be disposed of in an environ-mentally-friendly manner at suitable collection points (specialist trade or scrap recovery yard).

5.1.2 Fuse testing

Note

Two fuses are built into the measuring instrument, an 800 mA fuse for the current measurement range up to 400 mA max. and a 20 A fuse for the current measurement range up to 20 A max. Both fuses are quick-acting. Changing a fuse is described under "3. Safety regulations".

9V Battery

Fuse 20 A 250 V

6. COM (-) input socket (COM- or negative connection)

7. V-Ohm-(+) input socket (= positive connection)

8. Capacity or temperature measurement socket. Using this socket

(uncharged!) capacitors and also temperatures (using the available optional NiCrNi probe) can be measured.

9. RS-232 interface for the connection of an interface cable for data transfer to an IBM compatible Windows 95 PC.

5. Using the multimeter

5.1Fitting the battery – changing the battery and

testing the fuses

5.1.1 Fitting the battery – changing the battery

In order for your measuring device to function perfectly, it must be ﬁtted with a 9V dry cell battery. When the battery change symbol appears in the display the battery must be replaced. To do this, proceed as follows:

Disconnect the measuring instr ument from the circuit being measured, remove the test leads from the instrument, switch it off, remove the holster (if present) and loosen the two captive ﬁxing screws on the underside of the case with a suitable screwdriver. Now carefully remove the sockets cover (if necessary with a thinbladed screwdriver). In addition note the following diagram. Disconnect the used battery from its connecting clip and replace the battery with a fresh one of the same type. Remember to push the sheath, if present, onto the battery again.

After successfully replacing the battery place it in the battery compartment and carefully close this once more. Take care that the connecting clips leads do not become crushed.

Attention!

Never exceed the input levels, as in this can cause damage to the measuring device, and can endanger the user.

5.4 Positioning the measuring instrument (sloping position) or

position of use Always operate the multimeter so that the

liquid crystal display (LCD) can be read and the digital

display is facing upwards. There is a fold-out bracket on the

rear of the instrument for better readability in upright

operation.

5.4 Commissioning

5.4.1 Basic settings

The measuring instrument is switched on by turning the rotary switch to the desired measurement function. "Normal" measurements can now be carried out without additional functions. To select such an additional function, operate one of the buttons in the button panel.

5.4.2 Connector & socket conﬁguration and switch markings a)Connector for capacity and temperature measurement (polari-

sed "+" and "-") Place a (discharged!) capacitor correctly polarised in the sockets. Ensure that the connections are long enough, because otherwise incorrect measurements can occur. For temperature measurement plug the connections of a K-type thermocouple element (NiCrNi) with the correct polarity into the marked sockets.

b)Type of operation switch = measurement function switch (10)

The measuring instrument has a special function which enables the built-in fuses to be checked before each measurement for soundness (whether "blown" or intact). For this, proceed as follows:

- Position the rotary switch to " / " (Continuity check/Diode

test)

- Press the yellow button once. The word "FUSE" appears in the

display.

- Connect "only" the red measuring lead to the V/Ohm/F socket

of the multimeter.

- Touch the metal insert of (deep within) the uA/mA socket with

the probe). Should an acoustic signal sound and the bar graph indicate a minimum, the fuse (800 mA, quick-acting) is in order . In case not, the fuse is defective. In this case, replace the fuse with new.

- Next, touch the metal insert of (deep within) the A socket with

the probe). Should an acoustic signal sound and the bar graph indicate a minimum, the fuse (20A, quick-acting) is in order. In case not, the fuse is defective. In this case, replace the fuse with new.

5.2 Connecting the instrument leads

Always use only the supplied measuring leads for making measurements. Before each connection note the condition of the connecting plug and test prods and check the insulation for damage. These measuring leads are intended for voltages up to 1500 V max. The measuring instrument, the VC 350E is designed for voltages up to 1000 VDC or 750 VAC rms max. Take particular care when dealing with voltages greater than 25 V AC or 35 V DC.

Switch to temperature measurements with yellow button

A/TEMP°F = DC and AC current measurements up to 20 A max.

or temperature measurements in °F, Auto-Range and manual range selection possible; Switch to temperature measurements with yellow button

c) 20A socket For DC or AC current measurements up to 20 A max. (!), the red measuring lead must be plugged in here.

Attention!

The measuring function switch must not on any account be positioned on voltage measurement (mV or V) during current measurement.

d) mA socket

The red instrument lead should be plugged in here for direct or alternating current measurements up to 400 mA max., but only if the measuring function switch is set to "4mA" or "400mA".

e) COM = common socket

the black measuring lead must be plugged in here for all measurements except temperature and capacity measure-ments (common socket means minus "-" or ground socket)

f) V/Ohm socket

the red measuring lead must be plugged into this socket to carry out voltage, frequency or resistance measurements, continuity checks or diode tests.

Attention!

The type of operation switch may not under any circumstances be moved during measurements, because otherwise the measuring instrument can be destroyed and it can endanger the user's life.

Arranged in the full circle, the different measuring ranges can be selected by turning the switch:

OFF = switch the measuring instrument off when measu-

rements are completed

V = Volt AC/DC Both Auto-Range and manual range

selection (R-H) is possible

mV DC = millivolt DC (milli = 10 exp.-3) only a mV DC volta-

ge range up to 400 mV max.

Ohm = resistance measurement range; both Auto Range

and manual range selection (R-H) possible

" = continuity check / diode test - no Auto Range and

no manual range selection possible, switch to the respective function with the "blue" button FREQ = frequency measurement - no manual range selection (with R-H) possible

CAP = uA= uA AC/DC measurement (u = micro = exp.-6),

Auto Range and manual range selection possible

uA = uA AC/DC measurement (u = micro = exp.-6), Auto

Range and manual range selection possible

mA/TEMP°C = mA AC/DC or temperature measurements in °C,

Auto Range and manual range selection possible;

- As soon as the test probes are removed from the measurement point, the small display returns to "0000", while the set reference value remains visible in the main display.

D) COMP (= Comparison)

In this sub-function, a high/low comparison can be carried out, in which the highest and lowest stored reference value can be compared with the present measured value. The main (large) display shows "Lo", when the present measured value is smaller than the lowest stored (preset) reference value. "Hi" is displayed when the present value is greater than the highest stored reference value. When the present measured value lies between the upper and lower set limits, "Pass" is displayed. The actual measured value is given in the small display. This function is not available for frequency, capacity or temperature measurements. To use this function, proceed as follows. There are two methods to input or set the comparison values.

Possibility 1:

D1) As under reference value measurement, the range in which

the comparison measurement is to be performed must ﬁrst be set; For this, press the "R-H" button until the desired measurement range is set.

D2) Then, press the button "COMP" until the rightmost digit in

the main display ﬂashes. Should the button be pressed only brieﬂy, instead of the set mode "Err" (Error) appears in the display. In the small display "Hi" (High = upper comparison value) appears.

D3) Now set the desired upper limit for this digit with the buttons

" REL" and " R-H" Then, press the "COMP" button once more.

5.4.3 Display-explanation and symbols A) Digital display

The display can display up to "4000" and (-) polarity is auto-matically indicated (for negative voltages or reversed polarity). There are also three decimal point positions.

B) Analogue bar graph

The analogue bar graph consists of 43 segments. It has a slightly higher measuring speed than the digital display. This enables measured value trends to be more easily recognised, as with an analogue multimeter, but without its mechanical disadvantages (damping of the measurement indicator).

If the measurement range is exceeded, then "OL", for Overload, is displayed.

C) REL (= Relative)

This function enables so-called reference value measurements, in that the present measured value is displayed in the "small" display and the difference in the main display. This function is not available under frequency measurements, diode tests, continuity checks and temperature measurements. Additionally, manual range selection "R-H" must be used for "REL" measurements rather than "Auto Range". To set a reference value, proceed as follows:

- Select the range in which the reference value is to be used; in addition press the button "R-H" until the desired measurement range is set.

- Measure for example under voltage measurement a DC voltage (a battery) of 1.5V. While measuring, press the "REL" button. The reference value (1.5 V) is now set. Now perform the voltage measurement in comparison with the reference value. The present measured value at the measurement point is displayed in the small display, while the difference between the set reference value and the present measured value is displayed in the main display.

Possibility 2:

D1) Carry out steps D1) and D2) in "Possibility 1". Then touch with

the test probes the point to be measured, the value of which is to be set as the upper limit (Hi).

Press the button " REL" until the desired value is displayed in the main display. At the same time the rightmost digit remains ﬂashing. Now remove the test probes from the points of measurement. Press the "COMP" button four times, until "Hi" disappears from the small display and instead "Lo" appears.

D2) Connect the test probes to another point to be measured ,

which is to be set as the lower limit (Lo). Now press the " RH" until the desired value appears in the main display. Here, too, the rightmost digit remains ﬂashing. Remove the test probes from the (second) point to be measured. Press the "COMP" button four times, until "Lo" disappears from the small display and the comparison measurement begins. In the absence of an applied measurement signal, "Lo" is displayed, with in addition "0000" in the small display. Under resistance, diode test and continuity check measurements "Hi" appears in the main instead of "Lo". In the small display "OL" (Over load) appears instead of "0000".

D3) Connect the test probes to the measurement point, the value

of which is to be set as the comparison measurement value. If the present measured value shown in the small display is lower than the set lower comparison value, then "Lo" appears in the main display. If the present measured value lies above the set upper comparison value, "Hi" appears in the main display. If the present measured value lies between the set upper and lower comparison values, "Pass" appears in the main display.

D4) To be able to leave the function, the measuring instrument

must ﬁrst be removed from the measurement circuit and the rotary switch then moved to another switch position.

D4) The next-left digit ﬂashes. Proceed as described in c) until the

whole "Hi" comparison value is set.

D5) Press the yellow button once "COMP". The upper limit value

"Hi" is stored in memory, "Hi" disappears from the small display and "Lo" (Low = lower comparison or limit value) appears in its place. Once again the rightmost digit ﬂashes.

D6) Carry out the setting of the lower limit values as described in

c. Then, press the "COMP" button once again. The comparison measurement begins. In the absence of an applied measurement signal, "Lo" is displayed, with in addition "0000" in the small display. Under resistance measurement, diode test and continuity check, "Hi" appears in the main display instead of "Lo". In the small display "OL" (Overload) appears instead of "0000".

D7) Connect the test probes to the measurement point, the value

of which is to be set as the comparison measurement value. If the present measured value displayed in the small display is lower than the lower comparison value set, then "Lo" appears in the main display. If the present measured value lies above the set upper comparison value, "Hi" appears in the main display. If the present measured value lies between the upper and lower comparison values set, "Pass" appears in the main display.

D8) To be able to leave the function, the measuring instrument

must ﬁrst be removed from the measurement circuit and the rotary switch then moved to another switch position.

Note

Negative measured values cannot be set.

Note

The measurement values are reproduced as they wer e stored (e.g. voltage values in "V" while in resistance measurement), independently of the measurement function setting.

F) R-H (= Range Hold)

In this function the automatic range selection (Auto Range) can be switched off and the measurement range set by hand (manually). The "AUTO" symbol disappears from the display as soon as the button is ﬁrst pressed. With each further press of the button

" R-H" the decimal point is shifted one position to the left or right and the units of measurement change correspondingly.

To leave this function press the " R-H" button until "AUTO" is displayed in the upper display strip again.

G)Auto Hold - MIN - MAX function

The "Auto-Hold" function enables a measurement value to be "frozen" / held for later use, e.g. in measurement processes. With the MIN function, the lowest measurement value appearing is automatically stored. With the MAX function, the highest measurement value appearing is automatically stored. The special function(s) is(are) not useable under temperature, capacity or frequency measurements. While using the special function, the "Auto Range mode" (automatic range selection) is in addition not active.

It is therefore necessary to set a speciﬁc measurement range for this special function beforehand. While using a special function, this becomes abandoned if the measurement range is changed manually. To set / activate the special function, proceed as follows:

G1) Connect the red test lead to the respective measurement

socket (but not "COM") of the measurement function with which the "Auto Hold MIN-MAX" function is to be used. Connect the black test lead to the "COM" socket.

E) MEM (= Memory) and RCLL (= Recall)

With this special function, except under temperature t measurement, up to 8 reference values can be stored and called up / reproduced. Measurement values of different measurement functions can also be stored, such as DC voltage in Memory 1, resistance in memory 2 and so on. To do this, proceed as follows:

E1) Performing measurements. Each time a certain value is to be

stored, no matter in what measurement function (except temperature measurement), press the "MEM" button. As a result, two numerals separated by a space appear in the small display. The left one shows the memory location at present being reproduced ("0" when "RCLL" button not yet pressed), the right one shows the veriﬁable / speciﬁable memory locations.

E2) When the ﬁrst measurement value has been stored by pres-

sing the "MEM" button, this is veriﬁed by the number "1". Up to eight (8) measurement values can thus be stored. When all memory locations are ﬁlled, the number 8 is displayed on the right in the small display.

E3) When one of the eight stored values is now to be used, the

"RCLL" button must be pressed. Every time the "RCLL" button is pressed, the next-higher memory location opens. The stored measurement value is thereby read out. The memory location currently being read is given in the left row of numbers from 1 to 8.

E4) To be able to leave the Store/Recall function without losing

the stored values, turn the rotary switch, but not to "OFF". To erase the stored values, either press the "MEM" button or turn the rotary switch to "OFF".

Note

So that under resistance measurement, diode test and continuity check a "MIN" measurement is possible at all, either the test probes must be held together ("short-circuited") or a resistance measured. Only then can the "REC" button be pressed, and only then does the symbol "A-H" disappear from the display, or only then does the symbol "MIN" appear in the display. When "MIN" is visible, normal measurements (under resistance measurement, continuity check and diode test) can be proceeded with. This procedure is not required with other measurements.

Now connect the test probes to the circuit (points) to be measured. The present measured value appears both in the large and small displays. Now remove the test probes from the test points. The most recently measured value remains frozen (held) in the large display. In the small display, "OL" appears under resistance measurement, continuity check and diode test. "0000" appears in the small display under the other measurement functions. The measurement value now remains frozen/held in the large display until a smaller value is established during a further measurement. The large display always displays the smallest occurring measured value.

G6) When the MAX function is to be used and the instrument is in

the "MIN" function mode, press the "REC" button once again. The "MIN" symbol disappears and in its place the "MAX" symbol appears to its left. When, however, the instrument is at present in "Auto Hold" mode, press the "REC" button twice. When the "Auto Hold" mode is also deactivated, the REC" button must be pressed three times.

G2) Set the rotary switch to the desired measurement function

(but not to one of those mentioned as not available).

G3) Switch off the "Auto Range" function while setting the desi-

red measurement range by hand (= manually) with the button.

G4) When the Auto Hold function is now to be used, press the

"REC" button. The symbol "A-H" appears in the so-called headline of the display. "0000" appears in the small display and in the main display, independently of the range setting. With the measurement functions diode test, resistance measurement and continuity check, "OL" for overload or overrun appears in the small and large displays instead of "0000".

Connect the test probes to the circuit to be measured. The present measurement value appears both in the small and large displays. Now remove the test probes from the points of measurement. In the large display the most recently measured value remains frozen / held. In the small display, "OL" appears under resistance measurement, continuity check and diode test. Under the remaining measurement functions "0000" appears in the small display.

When a new measurement is now made, the value displayed in the large display remains held for another approx. 4 seconds, before it disappears or a new measurement value is displayed.

G5) When the MIN function is to be used while the "Auto Hold"

function is presently in use, press the "REC" button once again. The symbol "A-H" for Auto Hold disappears from the headline as a result and in its place the symbol "MIN" appears beneath. When however the "MAX" mode is presently in use, or the "Auto Hold" mode is not in use, the "REC" button must be pressed twice.

The setting / changing of the respective alternate value is done with the " REL" or " R-H" button. Having successfully

made the setting, press the yellow button again.

H2) To activate (switch on) the printer port, before switching on

the measuring instrument (by means of the rotary switch) the "REC" button and the yellow button must be pressed. After approx. 2 to 3 seconds release the yellow button, but continue to press the "REC" button. Now switch on the measuring instrument and the computer. The printer port is activated. Every 10 seconds, the measurement data with measured value, measurement range and measurement unit will now be printed out via the connected serial printer. To switch the printer port off again, position the rotary switch to "OFF".

H3) To switch off the Auto Power Off function, before switching

the measuring instrument on (by means of the rotary switch), press the blue button. After approx. 2 to 3 seconds release the blue button and immediately afterwards, switch the measuring instrument on by means of the rotary switch. The measuring instrument will now not switch off after approx. 13 Min., but rather remain operating until either the battery is empty (used up) or the rotary switch is set to "OFF" (instrument off). If the measuring instrument is switched off by means of the rotary switch and afterwards switched on again, the Auto Power Off function is reactivated, i.e. the instrument switches off automatically after 13 minutes.

5.4.4 Display information or symbols about the operating modes

a) Battery change indicator

An alkaline 9V battery in this measuring instrument lasts on average approx. 400 hours. Approx. 8 hours before the battery "expires", the battery change symbol appears in the display.

Note

The "MAX" measurement procedure is similar to the "MIN" measurement. Proceed as described in "Note" under "MIN" measurement.

Now connect the test probes to the circuit (points) to be measured. The present measured value appears both in the large and small displays. Now remove the test probes from the test points. In the large display the most recently measured value remains "frozen" (held). In the small display, "OL" appears under resistance measurement, continuity check and diode test. "0000" appears in the small display for the other measurement functions. The measurement value now remains frozen/held in the large display until during a further measurement a higher value is established. The large display always displays the highest-occurring measured value.

H) "Device on" special functions

When the instrument is switched on, various special functions can be activated. For example the "measurement frequency" for alternating current - or AC voltage measurements can be changed from 50 Hz to 60 Hz and vice versa. It is also possible to connect a serial printer and to activate the printer port by means of the "Device on" function. With the last of the three "Device on" special functions, the "Auto Power Off" function (automatic switchoff after approx. 13 minutes) can be turned off. When one of these special functions is to be activated, proceed as follows:

H1) To be able to change the measurement frequency, the yellow

button must be pressed and held when switching on the measuring instrument (by means of the rotary switch) and released after approx. 2 to 3 seconds. As a result "50 Hz" or "60 Hz" appears in the display according to the previous setting.

Cause Remedy

Measuring instrument Read through the operating not operating instructions thoroughly.

Is the battery unused?

The battery is in order, but Are the fuses in order? no current measurement Check the fuse(s) per 5.1.2. Are the possible fuses clipped in the holder(s)?

6. Performing measurements

General:

The multimeter is not protected against the test leads being connected to the wrong measuring socket as a function of the respective measurement function. It can be damaged or destroyed. To safeguard against this, a so-called acoustic socket alarm is built into this multimeter, which together with the selected measurement function (voltage, frequency, resistance or capacity measurement, etc.) reproduces various signal sequences. If for example the red test lead is in one of the current measurement sockets (uA/mA or A) and the black test lead in the COM socket but the rotary switch is not set for current measurement, then the following acoustic signals are hear:

V AC/DC : ——————— (continuous tone) mV DC/FREQ : - - - - - - - - ("slowly"-interrupted tone) Ohm / /->l- : - - - - - - - - - - - ("quickly"-interrupted tone) CAP : (no acoustic signal)

Note

Should other test leads be used instead of those supplied with the measuring instrument, the socket alarm does not function.

Between each individual measurement cycle, a battery check is carried out.

b) All other symbols, which stand for the various units of measu-

rement:

AC = Alternating Current DC = Direct Current mV = Millivolt (exp.-3) V = Volt uA = Micro-Ampere (exp.-6) mA = Milliampere (exp.-3) A = Ampere kHz = Kilohertz (exp.3) MHz = Megahertz (exp.6) °C = Degrees Celsius °F = Degrees Fahrenheit uF = Microfarad (exp.-6) nF = Nanofarad (exp.-9) kΩ = Kiloohm (exp.3) MΩ = Megaohm (exp.6)

5.5 Fault ﬁnding

If the multimeter is not functioning correctly, the following causes may be responsible:

Each of the voltage ranges, whether AC or DC, possess an input impedance of 10 MOhm in parallel with < 100 pF). The AC voltage input is AC-coupled. As soon as a "-" appears in front of the measured value in a direct voltage measurement, the measured voltage is negative (or the instrument leads are switched).

Notes

- Due to the fact that the measurement input is very sensitive, it may be that certain measured values are displayed even with test leads unconnected (not connected to a circuit). This occurrence is normal and will disappear as soon as measurements are performed.

- In the "mV DC" measurement range, no "Auto Range" (automatic range selection) is available.

6.2 Current measurement

To measure direct or alternating currents, procedure is as follows:

1. Connect the red test lead to the A or uA/mA socket and the

black test lead to the COM socket.

2. Position the rotary switch to current measurement (uA, 4000 uA max.; or mA, 400 mA max.; or A, 20 A max). In the current measuring range both automatic ("Auto Range") and manual range selection ("R-H") is possible.

3. Press the blue button according to whether DC or AC current is now to be measured. As soon as "AC" appears in the display, alternating current mode is selected.

4. Open the unpowered circuit to be measured (switch off circuit to be measured) and connect the test lead(s) in series with the unpowered circuit to be measured (see following diagram).

6.1 Voltage measurement

Attention!

The maximum permitted input value must not be exceeded under any circumstances. MAX. 1000 VDC or max. 750 VAC rms. Do not touch any circuits or circuitry components when measuring voltages higher than 25 VACrms or 35 VDC. The measuring instrument may only be used in installations of Overvoltage category II.

To measure direct or alternating voltages, the procedure is as follows:

1. Connect the red instrument lead with the V/Ω socket and the

black instrument lead with the COM socket.

2. Set the rotary switch to the desired position (V) or, only for DC voltage measurements, also to "mVDC".

3. Press the blue button according to whether DC voltage or AC voltage is to be measured (except for mV DC). As soon as "AC" appears in the display, the instrument is in AC measurement mode.

4. Connect the test probes with the test object (load, circuit, etc.).

Attention!

Because the metal inserts of the socket contacts sit relatively deeply (on grounds of safety), it is imperative that the measuring lead plugs are inserted into the respective sockets up to their stops. Make sure that the test lead plugs are securely connected to the measuring instrument before a supposedly "0V" measurement has been performed and circuit components then touched. Attention!! Life can be endangered if volt ages of more than 25 VAC rms or 35 VDC are touched.

symbols appear in the display: "OL", " " and "Ω". Should the symbols not appear, press the blue button once.

3. Then connect the test probes with the absolutely voltage-free test points. Depending on the circuit resistance present, the following acoustic signals are heard:

————————— (continuous tone) with 30 Ohm or less — — — — — — — ("quickly"-interrupted tone) with more than

30 Ohm and less than 106 Ohm

————- ———- ("slowly"-interrupted tone) with more than

106 Ohm and less than 1700 Ohm

Attention!

Do not measure charged capacitors, as a possible discharge may damage your measuring device. The indicated measured value is not the "true" resistance value. To establish this, a resistance measurement must be carried out (as follows).

6.4 Resistance measurement

Attention!

Ensure that all circuitry components, circuits and structural elements to be measured, as well as other test objects, are completely voltage-free.

For measurement of voltage-free resistance up to max. 40 MOhm proceed as follows:

5. Power up the circuit to be measured (circuit, power, etc.) and read the measured current. Whenever a "-"appears in front of the measured value, this indicates a direct current or the measured value is negative or the test leads reversed.

Attention!

Do not measure any currents in circuits in which voltages greater than 250 VDC or VAC rms can occur, so that the measuring device is not damaged and your life is not endangered as a result. Under no circumstances should currents over 20 A be measured. Measurements should only be made in 16 A-fused current circuits or those in which powers greater than 4000 VA cannot occur. Measurements of currents equal to 20 A must only be measured for a maximum of 10 s duration and must only be performed in intervals of 15 minutes (cooling down phase for the shunt).

6.3 Continuity checking and diode test

With this function voltage-free leads, fuses, circuits etc. can be acoustically checked for continuity. This measurement is per-formed as follows:

1. Connect the red instrument lead with the V/Ω socket and the black instrument lead with the COM socket.

2. Position the rotary switch to / . As a result the following

DMM

Consuming device, load, circuit

Current source

3. Now connect the test probes to the test points, an unpowered semiconductor circuit, with the red probe to the anode and the black probe to the cathode (these usually being indicated by a coloured ring, spot or similar). To check a diode path in the conducting direction, a voltage of approx. 0.25 V (germanium) or 0.7 V (silicon) will be measured, provided that the diode path is not defective. When the test probes are reversed, i.e. red to the cathode and black to the anode, then the high resistance direction of the diode path will be checked.

If "OL" is displayed, the diode is serviceable. If on the contrary a value between 0 V and "OL" is displayed, either the test points have been incorrectly chosen or the diode is faulty.

The test voltage under diode test is sufficient to cause most (low current) LEDs to emit light. With LED operating voltages of more than 2.0 V, however, the DMM can incorrectly indicate that the LED is faulty.

Attention!

During the diode test, ensure that the diode and circuit in which it is installed are completely voltage-free. Any capacitors must be discharged.

6.6 Frequency measurement

Attention!

It is essential to observe the max. input levels!! Do not connect any voltages greater than 250 VDC or VAC rms max. With voltages greater than 25 VAC or 35 VDC, there is danger to the user in the event of contact.

1. Connect the red instrument lead with the V/Ω socket and the black instrument lead with the COM socket.

2. Position the measurement function switch to resistance measurement (Ohm).

3. Then connect the test probes with the absolutely voltage-free test points. Auto Range sets the appropriate measurement range, to produce the smallest possible measurement error.

The resistance of the test leads can normally be ignored (approx.

0.1 to 0.2 Ohm). However, even this low value can lead to inaccu-

racies in the 400 Ohm measurement area. To compensate for these "measurement errors", the REL function (described under 4.4.3.C) can be used. When resistance measurements are performed, take care that the test points which are to be touched with the test probes are free from dirt, oil, solder ﬂux or similar. Such conditions can falsify the measured value. With resistances greater than approx. 4 MOhm the display can take some time to become stabilised. As soon as "OL" appears in the display and the bar graph ﬂashes, the measurement range has been exceeded, or the circuit being measured is open circuit/high resistance (> 40 MOhm).

6.5 Diode test

For measurement of unpowered semiconductor circuits (diodes, transistors, rectiﬁers, etc.), proceed as follows:

1. Connect the red test lead to the V/Ω socket and the black test lead to the COM socket.

2. Set the rotary switch to " / " and press the blue button once. The following symbols are shown in the display: The diode symbol "->l-", "mV" and "OL " (for overload or here: "inﬁnitely-high resistance"). Manual range selection is not possible.

To measure the capacity of capacitors, proceed as follows:

1. Discharge every capacitor, before connecting it to the measuring instrument. Do not measure charged capacitors, otherwise the measuring instrument can be damaged.

2. Set the rotary switch to "CAP".

3. Measurements can now (only) be performed with the connec-

tors on the measuring instrument. With polarised capacitors, observe the correct ("+" and "-") polarity. Take care that connecting "legs" are sufficiently long and not too thin (weak). Should the "legs" be too short and thus not be in contact or if the capacitor is faulty, a capacity of approx. 00.11 nF is displayed.

6.9 Temperature measurement

The temperature display ranges from -40°C to +1000°C, that is from -40°F to 2000°F, with the optionally-available measuring probe. Temperature measurement is carried out exclusively with a K type (NiCrNi) thermocouple. When no temperature probe is connected to the measurement socket on the measuring instrument, the present room temperature (ambient temperature. To perform a temperature measurement, proceed as follows:

1. Position the measurement function switch either to "mA/ TEMP°C" or "A/TEMP°F" and press the yellow button once.

2. Connect the thermocouple plug, correctly polarised (narrow and wide contact blades) to the CAP/TEMP measurement socket.

While measuring system voltages greater than 25 VAC or 35 VDC, do not move the rotary switch to another measurement function). The sensitive electronics within the measuring instrument can otherwise be destroyed, as a result of which the user can be endangered.

To measure a frequency, proceed as follows:

1. Connect the red test lead to the V/Ω socket and the black test

lead to the COM socket.

2. Position the rotary switch to "FREQ".

3. Connect the test probes to the points to be measured (genera-

tor output, etc.).

Note

To perform a measurement with maximum accuracy, use a BNC screened cable where possible (adapter available) for the measurement, to avoid error measurements caused by radiated ﬁelds.

For frequency measurement, it is not possible to use manual range selection!

6.7 Capacity measurement

Attention!

When short-circuiting capacitors, high-energy discharges can occur. Attention - danger to life! Do not touch the connectors of capacitors with voltages over 35 VDC or 25 VAC. Take care in spaces in which dust, inﬂammable gas, steam or liquid is present or can occur. ==> Danger of explosion!

3. Click on the "START" (bottom left, on the taskbar) with the

left mouse button: and then click on "RUN".

4. As a result, a dialog box appears into which "A:\Setup.exe"

should be entered. Click on OK". Follow the on-screen setup program instructions.

5. Once the program has successfully loaded, click on "OK".

Step 2

The software for Windows 95 is now loaded. To "communicate" with the multimeter, the following inputs/actions are now required:

a) Connect the interface lead 4-pin plug (supplied) to the RS-232

interface on the (switched off) measuring instrument. Connect the other end of the interface lead to a free serial port on the (switched off) computer.

b) Power up the PC. Open the START window under Windows ‘

95. Click the mouse pointer on the Programs menu item using the left mouse button. Among others in the sub-directories listed is "DMM97". Click on OK „97". Thereupon "About Scope View" is displayed. Click on OK.

c) The menu "Scope View Main Menu" is displayed. To install or

change the hardware conﬁguration, click on "Setup". "Scope View Setup" appears on-screen. Enter the following information:

Meter Model 350E Com Port COM1, COM2, etc. (communications interface

on the PC)

Baud rate 1200 (transfer speed 1200 bits per second) d) Having inputted the data, store the data "permanently" by

clicking on "SAVE" and then on "CLOSE" to close the window .

Attention!

Do not connect any voltages. The instrument can be destroyed by this.

6.10 Using the analogue bar graph

The bar graph is easy to operate and understand. It is comparable with the pointer of an analogue measuring instrument without its mechanical disadvantages. It is particularly suitable for measuring signals that change rapidly, for which the digital display is too "slow". So the trends of a measured value change can be quickly recognised and evaluated.

6.11 Using the multimeter in connection with a computer

The multimeter is supplied together with a diskette, on which is software for DOS and Windows 95 operation. So that the measuring instrument can communicate with an IBM compatible PC, the software must ﬁrst be installed.

Note

The following installation(s) presuppose basic knowledge of the various MS DOS commands and an available hard disk. Read the MS DOS manual with regard to software installation, if you have no or insufficient basic knowledge of MS DOS commands. In addition, a VGA monitor (+ VGA card in the computer) is required to operate the software.

Step 1

1. Start your computer and activate Windows. Windows 95 (nor-

mally) loads automatically.

2. Under Windows, insert the ﬂoppy disk into the 3.5" drive (A or B according to the installation).

Notes

Should there be no hard disk available, it is possible to start the program from the ﬂoppy disk: Change to the drive in which the ﬂoppy will be run. Change to the "DOS" subdirectory on the ﬂoppy, type "DMM" and press Enter. To stop the program, or if an "ERROR" occurs, perform a warm boot (Control, Alt, Del keys).

Step 4

The following deﬁnes the communication parameters.

Transfer rate : 1200 baud Character code : 8-bit ASCII Parity : none Stop bits : 1

Step 5

The conﬁguration of the measuring instrument interface is as follows:

Data transfer between the measuring instrument and the computer is bi-directional.

RXD

RS-232C

GND TXD

DSR RTS

e) To run the PC program, click on "OFF" in the bottom right of

the menu box.

Step 3

Use of MS DOS software is described below: a) Switch on the computer and measuring instrument. The MS

DOS program is named METER.

Note

The following installation(s) presuppose basic knowledge of the various MS DOS commands and an available hard disk. If in-adequate or no basic knowledge of MS DOS commands is available, refer to the MS DOS manual concerning software installation. In addition, a VGA monitor (+ VGA card in the computer) is required to operate the software.

1. Insert the ﬂoppy disk into the appropriate disk drive (A or B or

similar).

2. Make a directory on the hard disk (usually "C") with the name

"METER".

cd\ [Enter] md METER [ENTER] [ENTER] = Press the "Enter" key.

3. Change to drive A (or B, etc., according to the installation). Call

the ﬁle METER and press ENTER key, e.g.: cd METER

4. Copy the ﬁles from the ﬂoppy to the hard disk:

copy a:\DOS c:

5. In order to start the program, enter "DMM" and press "Enter".

After that, follow the on-screen instructions.

Input impedance ..................: 10 MΩ in parallel with 100pF (VDC

and VAC)

Overload indicator ...............: "OL" is displayed for overload

Operating temperature........: 0°C to +40°C, with relative humidi-

ty <75%, non-condensing

Storage temperature............: -10°C to +50°C, with relative humi-

dity <75%, non-condensing, battery not installed

Temperature for guaranteed

accuracy.................................: +23°C ±5K

Battery change indicator.....: " " is displayed

Battery type ..........................: NEDA 1604 9V or 6F22 9V, alkaline

type

Weight...................................: approx. 364 g (with 9-V battery)

Dimensions (L X W X H).......: 189 x 90 x 38 mm

8.2 Measurement tolerances

Statement of accuracy in ± (% of the reading + number of digits). Accuracy 1 year at a temperature of +23°C ± 5°C, with a relative humidity of less than 75 %, non-condensing. The warm-up time is 1 minute.

7. Maintenance and calibration

To guarantee the accuracy of the multimeter over an extended period of time, it should be calibrated every twelve months (calibration service available at Service 2000). Changing a fuse is described under 3. 3. (Safety requirements). Battery changing can be found under 5.1.1. To clean the instrument or the display window, use a clean, lintfree, anti-static, dry cleaning cloth.

Attention!

Use no carbonaceous cleaners, petrols, alcohols or similar for cleaning. Otherwise the surfaces of the clip adapters / test leads can be attacked. In addition, the vapours are explosive and damaging to health. Do not use any sharp-edged tools, screw drivers, metal brushes or similar for cleaning.

8. Technical data and measuring tolerances

8.1 Technical data

Display .................................: 33/4-position LCD display up to

4000 (3999), with automatic polarity indication

41/2-position for frequency measurements

41/2-position "small" display with analogue bar graph display

(bar segment display)

Maximum measuring rate...: 2.5 measurements per second

Max. input current AC/DC...: 20 A

8.3 Maximum inputs

Voltage measurement : 1000 VDC or 750 VAC Current measurement : 20 A AC/DC in A range,

400mA AC/DC in mA range

Resistance : 40 MOhm, overload-protected: measurement 250 VDC/VAC rms

Frequency : 2 MHz, with max. 250 VDC/ VAC rms measurement input voltage

Attention!

The functions capacity and temperature measurement, continuity check and diode test are not protected against overload or excessive input voltage(s). Exceeding the maximum permitted input will result in damage to the measuring instrument or can endanger the user’s life.

Operation

Measuring range

Accuracy

Resolution

DC voltage 400 m V ±(0.3%+2dgts) 100 u V

4V ±(0.3%+1dgt) 1 m V

40 V ±(0.3%+1dgt) 10 m V

400 V ±(0.3%+1dgt) 100 m V

1000 V ±(0.5%+2dgts) 1 V

AC voltage 4 V ±(0.8%+3dgts) 1 m V

40 V ±(0.8%+3dgts) 10 m V 400 V ±(0.8%+3dgts) 100 m V 750 V ±(1.2%+5dgts) 1 V

Direct 400 u A ±(0.5%+2dgts) 0.1 u A current 4000 u A ±(0.5%+2dgts) 1 u A

40 m A ±(0.5%+2dgts) 10 u A 400 m A ±(0.5%+2dgts) 100 m A

4 A ±(1.0%+5dgts) 1 m A

20 A ±(1.0%+5dgts) 10 m A

Alternating 400 u A ±(0.8%+5dgts) 0.1 u A current 4000 u A ±(0.8%+5dgts) 1 u A

40 m A ±(0.8%+5dgts) 10 u A 400 m A ±(0.8%+5dgts) 100 u A

4 A ±(1.5%+10dgts) 1 m A

20 A ±(1.5%+10dgts) 10 m A

Impedance 400 Ω ±(0.8%+2dgts) 0.1 Ω

4k Ω±(0.5%+2dgts) 1 Ω

40 k Ω ±(0.5%+2dgts) 10 Ω 400 k Ω ±(0.5%+2dgts) 100 Ω

4MΩ ±(0.5%+2dgts) 1 kΩ

40 M Ω ±(1.0%+10dgts) 10 kΩ

Frequency 40Hz - 1kHz ±(1.0%+5dgts) 1 Hz

1kHz - 2MHz ±(0.3%+1dgt) 10 Hz - 1kHz

Temperature -40°C- +1000°C ± (3%+5dgts) 1°C

-40°F- +1999°F ± (3%+5dgts) 1°F

Capacity 100 nF - 100 uF ± (3%+10dgts) 10 pF - 1 uF

Frequency of AC voltage from 40 Hz to 100 Hz

Frequency of alternating current from: 50 Hz to 1 kHz

Diode test: test current max. 1 mA

Sensibility greater or equal approx. 2Vrms from 40 Hz to 300 Hz Sensibility greater or equal approx. 500Vrms from 300 Hz to 2 MHz

• Mesure des résistances jusqu'à une valeur maximale de 40 MOhm

• Mesure des capacités jusqu'à une valeur maximale de 400 uF

• Contrôle de la circulation du courant électrique et test des diodes

• Mesure des fréquences jusqu'à une valeur maximale de 2 MHz

• Mesure des températures comprises entre -40°C et +1000°C maximum, ou bien entre -40°F jusqu'à +1999°F (= Fahrenheit) maximum

• Il est interdit de pratiquer des mesures dans une pièce humide ou à l'extérieur , en particulier dans un environnement aux conditions défavorables. Des conditions défavorables se déﬁnissent comme suit:

- toute forme d'humidité (air trop humide, par exemple),

- la poussière, les gaz inﬂammables, les vapeurs et solvants,

- vibrations trop fortes,

- champs magnétiques trop puissants, créés à proximité de

machines ou de haut-parleurs,

- electricité statique (champs et décharges).

Une utilisation autre que celle prévue ci-dessus endommagera l'appareil et pourra provoquer, en outre, un risque électrique comme un court-circuit, un incendie, une électrocution etc.. Il est interdit de modiﬁer ou de reconstruire cet appareil dans son intégralité! Respecter absolument les consignes de sécurité!

2. Introduction, présentation

Le présent Multimètre se trouve équipé de plusieurs appareillages particuliers qui contribuent à renforcer de manière rationnelle et intelligente bon nombre d'opérations de mesure:

Multimètre numérique VC 350E

Attention! A lire absolument

Lisez avec une attention particulière l'ensemble de la présente notice d'emploi.. Pour tous dommages provoqués par un nonrespect des consignes du mode d'emploi, vous perdez vos droits de garantie; en outre, le non-respect des consignes peut vous mettre en danger de mort!! Nous n'assumons aucune responsabilité pour tous dommages en découlant. Conservez avec le plus grand soin la présente notice d'emploi.

Table de matières

Page

1. Utilisation conforme à la destination ...................................45

2. Introduction............................................................................46

3. Consignes de sécurité.............................................................47

4. Description des organes de commande................................52

5. Utilisation du multimètre.......................................................55

6. Réalisation de mesures ...........................................................74

7. Entretien et calibrage.............................................................88

8. Donnés techniques et tolérances de mesure........................89

1.Usage conforme à la destination du VC 350

• Mesure des tensions de courant continu jusqu'à une valeur maximale de 1000 VDC

• Mesure des tensions de courant électrique alternatif jusqu'à une valeur maximale de 750 VAC

• Mesure des courants continu et alternatif jusqu'à une valeur maximale de 20 A

3. Consignes de sécurité

• Désignation CE: Le multimètre numérique VC 350E répond aux normes CEM et correspond à la Directive 89/336/CEE ; il remplit les conditions de la directive sur les basses tensions 73/23/CEE.

• Cet appareil a été construit et contrôlé en tenant compte des normes DIN 57 411 Partie 1/VDE 0411 Partie 1, Mesures de prévention prises pour travailler avec des appareils de mesure électronique, ou encore de la norme IEC 1010-1. Il a quitté l'usine du constructeur dans un état parfait tant du point de vue de la sécurité que du point de vue technique. Si l'usager veut lui conserver cet état tout en s'assurant d'un fonctionne-ment exempt de risques, il doit absolument respecter les consignes de sécurité et les avertissements («Attention!» et «Avertissement») contenus dans la présente notice d'emploi. Le sens des symboles suivants doit être présent à l'esprit :

= Attention! Tensions qui présentent un risque au

contact! Danger de mort!

= Lisez la notice d'emploi

CAT II = Catégorie II de surtension

= Classe de protection II

• Les mesures de courant ne doivent être effectuées que dans des circuits électriques sous protection de 16 A ou sous tension inférieure à 250 VDC/VACrms ou avec une puissance inférieure à 4000 VA. Le multimètre ne doit pas être utilisé pour mesurer des installations de la Catégorie III de surtension d'après la norme IEC 664. Ni l'appareil ni ses câbles de mesure ne sont protégés contre les explosions de l'arc électrique (Norme IEC 031-13-101, Paragraphe 13.101). C'est exclusivement dans une

un second écran d'affichage, plus petit, comportant un affichage à 41/2 positions servant à un affichage simultané de la valeur enregistrée ainsi que de la valeur momentanément mesurée, un enregistrement des valeurs mesurées avec une mémorisation pouvant inclure jusqu'à 8 résultats de mesure, une fonction dénommée fonction de comparaison afin d'effectuer des comparaisons entre des résultats de mesure, etc..

Cet appareil de mesure est doté du procédé de réglage automatique dénommé AUTO RANGE, par l'entremise du quel, quelle que soit le nombre des mesures effectuées, l'appareil se règle à chaque fois automatiquement sur la catégorie souhaitée et adéquate pour la mesure. Quant à la fonction REL, elle permet des mesures comparatives en regard d'une mesure de référence. C'est sur le petit écran d'affichage qu'apparaît le différentiel de la mesure alors que le grand écran présente le résultat de la mesure courante. Avec la fonction COMP on peut opérer des mesures comparatives; leurs résultats peuvent indiquer ensemble la plus haute et la plus faible valeurs de la mesure. La fonction MEM (pour Memory = enregistrer) et la fonction RCL (pour Recall = rappeler) rendent possible l'enregistrement/la reproduction maximum de 8 résultats de mesure à la fois. Par sa fonction originale de coupure automatique de l'énergie électrique, le multimètre numérique coupe son alimentation de lui-même s'il reste pour un espace de temps d'environ 12 minutes sans fonctionner (étant en Stand by), aﬁn de ne pas gaspiller inutilement l’énergie de sa pile. Il est très facile de remettre le multimètre en service après cet arrêt automatique: il faut d'abord régler le commutateur rotatif sur la position «Off» avant de pouvoir se remettre sur la position souhaitée pour la prochaine mesure.

Le multimètre numérique est d'un usage universel: il peut être utilisé aussi bien pour la pratique d'un hobby que dans un domaine industriel (sous certaines conditions) ou dans le cadre scolaire.

• Pour remplacer les fusibles d'origine, assurez-vous que vous utilisez exclusivement des fusibles du type voulu et de l'intensité nominale secondaire souhaitée. Il est interdit d'employer des fusibles réparés ou d'occulter ou de faire bifurquer la protection par les fusibles. Pour changer les fusibles, séparez le multimètre du canal de mesure et fermez-le. Eloignez toutes les conduites, liaisons et broches. Munissez-vous plutôt d'un tournevis cruciforme adéquat avant d'ouvrir le boîtier avec précaution. Pour cela, il faut commencer par enlever le cache de la prise. Pour apprendre comment démonter le cache de la prise, consulter le texte et l'illustration contenus au paragraphe «5.1.1 Comment installer et remplacer la pile». Otez le(s) fusible(s) défectueux pour le(s) remplacer par le(s) fusible(s) de même type et intensité nominale secondaire.

0,8 250,8 A rapide, 250 V ; désignation ordinaire: F 0,8 A / 250 V ou F800mA/250V ou bien pour la catégorie A 20 A très rapide, 250 V ; désignation ordinaire: F20 A/ 250 V.

Après avoir remplacé les fusibles, refermez et revissez le boîtier avec précaution en suivant l'ordre inverse au démontage pour cette manœuvre. Ne remettez le multimètre en service qu'après vous être assuré que vous avez bien refermé et revissé le boîtier.

• Agissez avec la plus grande prudence quand vous cherchez à mesurer des tensions supérieures à 25 V pour le courant alternatif (AC) ou supérieures à 35 V pour le courant continu (DC). Vous pouvez déjà par la simple mise sous tension risquer la mort par électrocution, si vous êtes en contact avec les conduites électriques. Coupez d'abord la source électrique, raccordez le multimètre aux bornes de la source électrique à mesurer, réglez l'appareil sur la bonne catégorie de mesure, remettez enﬁn la source électrique en marche.

Après avoir effectué vos mesures, coupez à nouveau la source électrique et éloignez les câbles de mesure des bornes de celle-ci.

installation équipée pour fonctionner en conformité avec la catégorie de surtension II d'après la norme IEC 664 que l'on peut travailler, sans relier par une prise de terre les prises V/Ohm et COM, sur des courants atteignant au maximum 750 VAC ou bien 1000 VDC.

• Le multimètre et ses accessoires ne constituent pas des jouets: aussi doivent-ils être écartés des enfants!

• Dans les entreprises à caractère industriel, les consignes pour la prévention des risques d'accidents émises par la corporation des installations et exploitations électriques devront être respectées.

• Dans les écoles, dans les centres de formation et dans les ateliers de bricolage et de hobby, seul un personnel bien averti doit être responsable de la surveillance et de l'utilisation des appareils de mesure.

• Si vous ouvrez l'appareil ou si vous en retirez des éléments, sauf si vous pouvez le faire uniquement à la main, vous risquez de dégager des parties qui sont conductrices de courant. Des zones à connecter peuvent aussi être conductrices. Avant toute remise à niveau, tout service d'entretien, toute remise en état ou tout échange de pièces ou de blocs, vous devez débrancher l'appareil de mesure de toute source électrique ou de tout canal de mesure avant de procéder à l'ouverture de l'appareil. Si la remise à niveau, l'entretien ou la réparation doivent être pratiqués avec l'appareil ouvert et mis sous tension, seul le personnel averti et bien au fait des risques électriques comme des consignes de sécurité s'y rapportant (VDE-0100, VDE-0701, VDE-0683) pourra être utilisé.

• Les condensateurs de l'appareil peuvent continuer à être chargés, bien qu'il ait pu déjà être débranché de toute source électrique et de tout canal de mesure.

• Avant, pendant et juste après un orage, n'utilisez jamais le multimètre (attention à la foudre et aux saturations en énergie!). Tenez toujours absolument au sec vos mains, chaussures et vêtements, le sol, l'appareil de mesure et ses câbles de mesure ainsi que les contacts.

• Si vous constatez que vous ne pouvez plus travailler sans risque, alors il est recommandé de mettre l'appareil hors service et de s'assurer qu'il ne sera pas remis en marche involontairement. Vous ne pouvez plus travailler sans risque quand

- le multimètre a été endommagé,

- le multimètre refuse de fonctionner

- le multimètre est resté trop longtemps exposé à un envi-ron-

nement défavorable ou

- le multimètre a subi des conditions de transports difficiles.

• Ne branchez jamais l'appareil aussitôt après avoir quitté un espace froid pour rejoindre un espace chaud. La condensation qui peut être provoquée peut détruire votre appareil sous certaines conditions. Laissez l'appareil débranché en attendant qu'il s'acclimate à la température ambiante de la pièce.

4. Description des organes de commande

Illustration cf. côté rabattable

1. Ecran d'affichage à cristaux liquides (LCD) à 3 positions et 3/4, autorisant une lecture maximale limitée à 3999 (à 4 positions et 1/2dans le cas de la mesure des fréquences, avec une résolu-

tion maximale limitée à 19999; avec un «petit» écran affichant 4 positions et1/2. Affichage graphique analogique, panoplie

complète de plusieurs unités de mesure et symboles.

• Assurez-vous avant d'effectuer toute mesure que le multimètre ne se trouve pas dans le champ électrique.

• Avant de changer la catégorie de mesure, n'oubliez pas de retirer et d'éloigner les broches de mesure de l'objet à mesurer.

• Vériﬁez le bon état de votre multimètre ainsi que de ses câbles de mesure avant de procéder à chaque mesure.).

• Utilisez exclusivement les câbles de mesure livrés avec votre multimètre. Ils sont les seuls à être agréés.

• Aﬁn d'éviter tout risque d'électrocution, assurez-vous que pendant l'opération de mesure vous n'entrez ni directement ni indirectement en contact avec les zones de mesure ou avec les points sur lesquels portent les mesures.

• La tension entre n'importe laquelle des prises de 4 mm de l'appareil de mesure et la terre ne doit jamais dépasser la valeur de 600 VDC/VACrms.

• Ne travaillez jamais avec l'appareil de mesure dans des pièces ou dans des environnements aux conditions défavorables, où dominent ou peuvent dominer des gaz, vapeurs ou poussières inﬂammables. Pour votre sécurité personnelle, veuillez absolument éviter de mouiller ou de tremper l'appareil ou ses câbles de mesure. Interdisez-vous toute opération de mesure à proximité immédiate de

a) puissants champs magnétiques (haut-parleurs, aimants) b) champs électromagnétiques (transformateurs, moteurs,

bobines, relais, protection, électromagnétisme etc.)

c) champs électrostatiques (chargement et déchargement) d) antennes émettrices ou générateurs HF

2h RCLL Grâce à cette touche, les valeurs mesurées qui ont été

enregistrées sous «MEM» sont sélectionnées l'une après l'autre.

3. Commutateur rotatif pour le réglage des différents modes de fonctionnement (mesure de la tension, mesure du courant électrique etc.).

4. Entrée 20A Cette entrée de mesure est protégée par un fusible de 20 A et est garantie pour recevoir des courants continus et alternatifs de 20 A maximum.

5. Entrée uA / mA Par cette entrée, vous pouvez mesurer des ﬂux de courant continu ou alternatif jusqu'à 400 mA (entrée protégée par un fusible rapide de 800mA).

6. Prise d'entrée COM (-) (Contact COM ou «moins»)

7. Prise d'entrée V/Ohm (+) (= Plus)

8. Socle de mesure de capacité et de température. On peut mesu-

rer à l'aide de ce socle des capacités non chargées ou encore des températures (par le biais du capteur NiCrNi vendu en option).

9. Interface RS 232, connexion avec une interface pour le transfert de données informatiques avec un ordinateur personnel fonctionnant sous Windows 95 (compatible IBM).

2. Zone de touches manuelles pour les applications spéciales 2a Touche jaune destinée à la commutation de la fonction de

mesure de l'électricité (unité mA ou A) vers la fonction de mesure de la température (unité °C correspondant à mA et unité °F correspondant à A). Au moyen de cette touche, les fusibles («FUSE») sont contrôlés en position de commutation « / ».

2b REL Avec cette touche, d'une part la mesure de la valeur

de référence est enclenchée et d'autre part les valeurs de mise au point peuvent être modiﬁées à la hausse.

2c COMP Avec cette touche, s' enclenche la fonction de mesu-

re comparée («Comparison»).

2d Touche bleue pour la commutation entre les mesures de

valeurs de tension continue et alternative (pour les mesures faisant appel aux unités suivantes: V, uA, mA et A) ou, en position commutée « / », touche pour le test des diodes ou pour le contrôle (acoustique) du circuit électrique.

2e REC Cette touche enclenche la fonction de maintien auto-

matique «A-H» et l'enregistrement de la valeur minimale = MIN et de la valeur maximale = MAX.

2f R-H Au moyen de cette touche, vous pouvez a) quitter la

fonction en 2e ou b) sortir de la sélection automatique de la catégorie pour régler manuellement la catégorie de mesure ou bien c) modiﬁer les valeurs à la baisse.

2g MEM Indépendamment de la fonction de mesure (V, A,

etc.), on peut, à l'aide de cette touche, mémoriser jusqu'à 8 valeurs mesurées différentes. T outefois, dès que l'appareil est débranché, les valeurs mémorisées sont écrasées.

Attention!

Ne faites jamais fonctionner le multimètre alors qu'il est ouvert! Danger de mort! Ne laissez pas de piles usagées dans le multimètre car elles pourraient engendrer une corrosion qui pourrait avoir des conséquences néfastes pour votre santé, en raison des substances chimiques émises ou qui pourrait détruire le boîtier de la pile. Vous devez traiter les piles usagées comme des détritus à caractère spécial à éliminer conformément aux règles de la protection de l'environnement. V ous devez jeter vos batteries usagées selon les normes en vigueur auprès des services de collecte (commerçant ou institution de récupération).

5.1.2 Test des fusibles

Avertissement

L'appareil de mesure possède deux fusibles: un fusible de 800 mA pour les valeurs de courant à mesurer jusqu'à 400 mA maximum et un fusible de 20 A pour les valeurs de courant à mesurer de 20 A maximum. Ces deux fusibles sont des fusibles rapides. Le remplacement des fusibles est décrit au paragraphe «3. Mesures de sécurité.

Une fonction spéciale de l'appareil de mesure permet avant chaque mesure de vériﬁer l'état de fonctionnement et l'intégrité des fusibles (indication: «fondu» ou «en bon état»). Procédez comme suit et respectez les tableaux suivants:

- Réglez le commutateur « / » (= vériﬁcation de la connexion ou tests des diodes)

- Appuyez une fois sur la touche jaune. Le mot «FUSE» (= fusi ble) est affiché.

- Ne reliez «que» le câble rouge avec la prise V/Ohm/F du multimètre.

5. Utilisation du multimètre

5.1Installation de la batterie - Changement de la pile et test des fusibles

5.1.1 Comment installer et remplacer la pile

Pour un fonctionnement optimal de votre appareil, utilisez des piles de 9-V . Dès l'apparition du symbole de la pile à l'écran, vous devez remplacer votre pile. Voici comment procéder:

Débranchez l'appareil de mesure du circuit électrique, écartez les canaux de mesure de l'appareil de mesure, éteignez-le, retirez la pochette de caoutchouc (si vous en possédez une) et défaites les 2 vis de ﬁxation situées sur la partie inférieure du boîtier au moyen d'un tournevis adéquat. Dégagez la protection de la prise avec précaution (en utilisant éventuellement un petit tournevis ). Consultez le tableau suivant. Détachez la pile usagée de la patte de ﬁxation et procédez au remplacement de la pile en mettant une pile neuve du même type. N'oubliez pas non plus de remettre la batterie dans son enveloppe.

Après cela, déposez la pile neuve dans le boîtier en la reliant. Faites attention à ne pas coincer les conduits des griffes de raccordement.

9V Batterie

Fusible 20 A 250 V

+ 63 hidden pages

Conrad VC 350E Operating Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual