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Conrad M 3860-M, Руководство по эксплуатации

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21

Each of the five voltage ranges presents an input impedance of 10 MOhm
(in parallel with < 100 pF). AC-voltage input is AC-coupled.

As soon as “ - “ is set before the display value during DC voltage measu-
rement, the voltage is negative (or the test leads are confused).

Hint!

During AC voltage measurement the right sub-display will show the dB-
value of the AC voltage, the middle sub-display the frequency and the
main display the present measuring value.

Due to the sensitive nature of the input terminal your meter might dis-
play any small values (not connected with the object). This residual value
will not affect the actual measurements. But Auto-Power-Off is not
active when the “phantom-measurements“ are displayed (for AC volta-
ge „mV“ and „V“).

During DC voltage measurement the three sub-displays below the main
display are active.

In the left sub-display the measuring value appears 1 second later, in the
middle sub-display the measuring value appears 2 seconds later and in
the right sub-display the measuring value appears 3 seconds later. This
means the left sub-display shows the measurement value which was 1 second
earlier on the main display, the middle sub-display shows the reading
which was 2 seconds earlier in the main display and the right sub-display
shows the value which was 3 seconds earlier on the main-display.

~

V

Voltage Source

Object

20

C

=  Centigrade Degree

F

=  Fahrenheit Degree

µF

=  Microfarad (exp.-6)

nF

=  Nanofarad (exp.-9)

KOhm =  Kiloohm (exp.3)
MOhm =  Megaohm (exp.6)
dB

=  Decibels

5. Measurement

5.1 Voltage Measurement

Attention!

Never exceed the maximum input limits. of max. 1000 VDC or 750 VACrms.

Do not touch circuits or parts of circuits, if you measure voltage more
than 25 VACrms or 35 VDC.

To measure DC or AC voltage proceed as follows

1. Set the rotary function switch to the desired position (mV or V)

2. Press DC Ohm/AC ( 

) key, depending if you want to measure DC or

AC voltage. As soon as “AC“ appears in the display, you are in the AC
voltage range.

3. Connect the test-lead tips with the object to be measured (load, cir-

cuit etc).

Содержание M 3860-M

Страница 1: ...is unit left the factory in safe and perfect condition To main tain the unit in this condition and to guarantee a safe operation the user must observe the safety rules and warnings which are contained in this manual by all means This multimeter may only be used in fuse lines which are protected with 16 A The voltage existing appearing must not exceed 250 VDC VAC and the maximum load must not excee...

Страница 2: ... protected against arcing IEC 1010 2 031 section 13 101 Keep children away from measuring units Pay attention to the rules for prevention of accidents in industrial enterprises prescibed by the Industrial Trade Associations for Electrical Installations and Production Facilities When using the unit in schools and hobby workshops the usage and the measurement has to be controlled by the responsible ...

Страница 3: ...xceeded overflow no acoustic signal during resistance measure ment diode test or temperature measurement 6 If there are doubts whether a safe usage is still possible the unit has to be put out of operation and be secured against unintentional use It must be assumed that a safe usage is not possible if the unit shows visible damage the unit does not work and longterm storage under unfavourable cond...

Страница 4: ...ompartment Now lift the cover carefully use a small screw driver Separate the old battery from the battery snap and fasten a new one of the same type Do not forget to use the provided battery insulation capsule After the battery has been changed reinsert the battery into the bat tery case and close it carefully secure it with the screw 8 Attention Observe the max input limits 19 Data Hold D H Data...

Страница 5: ...L CMP c SET R Press this button once to activate or to enter the selected function mode Press in the function mode the button D H again to exit wait for beeper sound 10 Attention Never use the measuring unit before the cover has been closed comple tely to avoid an electrical shock Never leave empty batteries in the measuring unit as even corrosion free batteries might leak and chemicals could be r...

Страница 6: ...yed After the first push of the SET R key the A H symbol is set and will stop blin king The R H symbol continues flashing to be able to set the manual measuring range with buttons UP and DOWN If the SET R key is pressed again the R H symbol is fixed You can commence measurement Another third push of the SET R key discards the function and the previous normal mode is restored In the function modes ...

Страница 7: ...ode you can freeze a reading in the second small display by pressing the SET R button d Range Hold R H In this function you can switch off the automatic range selection Auto Range and set the measuring range manually Each time the UP or DOWN button is pressed the decimal point is moved one posi tion to the left or to the right the units of measure are changed res pectively e g from kHz to MHz duri...

Страница 8: ...y 2nd 16 return from this function mode press Set Reset key twice RESET and you will return to Auto Range e Auto Hold A H In this function the meter will automatically record the minimum and the maximum display reading MIN and MAX values These values are currently updated refreshed The MIN value is shown on the left sub display the MAX value on the right sub display On the middle sub display the a...

Страница 9: ...eference value and the stored low reference value On the sub display Lo appears for reading less than the low refe rence value Hi is displayed for reading more than the highest refe rence value and Pass for a middle value between the low and the high reference value To activate this function mode push Func until the symbol CMP appears on the top of the display and LOW flashes over the left sub dis...

Страница 10: ...lay the measuring value appears 2 seconds later and in the right sub display the measuring value appears 3 seconds later This means the left sub display shows the measurement value which was 1 second earlier on the main display the middle sub display shows the reading which was 2 seconds earlier in the main display and the right sub display shows the value which was 3 seconds earlier on the main d...

Страница 11: ... the value which was 3 seconds earlier in the main display 5 3 Continuity Test With this function you can test dead leads fuses circuits Proceed as follows Set the rotary function switch to Ohm and press DC Ohm AC button until the symbol is displayed Afterwards connect the test lead tips A Current Source Object Multimeter 22 AC Voltage Measurement DC Voltage Measurement 5 2 Current Measurement Fol...

Страница 12: ...ds to stabilize If the measured resistance value exceeds the range OL appears in the display or the line is interrupted high ohmic 40 MOhm Hint During resistance measurement the three sub displays below the main display are active In the left sub display the present reading is taken 1 second later the middle display the reading is taken 2 seconds later and in the right display the reading appears ...

Страница 13: ...dle sub display shows the reading which was 2 seconds earlier in the main display and the right sub display shows the value which was 3 seconds earlier on the main display 5 5 Diode Test Set the measuring function switch 10 to The annunciator for diodes is displayed Manual range selection is not possible Now connect the test lead tips with the object under measurement an off circuit semiconductor ...

Страница 14: ...n the main display the middle sub display shows the reading which was 2 seconds earlier in the main display and the right sub display shows the value which was 3 seconds earlier in the main display 5 8 Transistor Test Attention The transistor jack is not protected against overload You will void war ranty and you can damage the meter if you build and use your own external transistor socket and conn...

Страница 15: ...to hFE position 2 Insert the transistor you want to measure into the appropriate transi stor socket Pay attention to the following points observe the sequence of connection of the transistor you will find it in the transistor comparative table Some Darlingtons or special power transistors contain internal base to emitter resistance that could cause undependable measu ring results The hFE measuring...

Страница 16: ...troyed Attention Life Danger 32 5 10 Usage of the Analogous Bargraph The bargraph is easy to use and to understand Is is comparable with the needle of an analogous measuring instrument but without its mechani cal disadvantages Is is especially for quick changing measuring signals for which the digital display is too slow So you can quickly recognize see tendencies in the measuring values If the ra...

Страница 17: ...s displayed power factor Cos phi is the power factor between Ampere and Voltage it is always 1 if ohmic loads consumers are concerned For inductive consumers cos Phi is between 0 3 and 0 98 The main display will show the true watts of your consumer 4 In the second function mode push UP button once the reference no 1 appears in mode digit on the left The left sub display will show costs per 1 hour ...

Страница 18: ... displayed in the left sub display the main display will show the respective frequency 0 010 KHz 10 Hz In the middle sub display the external DC input voltage is displayed in V max 40 V 5 To select other output frequencies push either UP or DOWN button For frequency and connected reference number see below 0 010 KHZ 10 Hz reference no 0 0 050 KHz 50 Hz reference no 1 0 060 KHz 60 Hz reference no 2...

Страница 19: ...eading rdg number of digit s dgt s Accuracy is specified at 23 C 5 K with a relative humidity of below 75 not wetting for a period of 1 year after production Warm up time is 1 minute 38 BYTE 1 2 3 4 5 6 7 8 9 A B C D E Example 1 DC 3 9 9 9 V CR Example 2 3 9 9 9 MOh m CR The sequence of data transmission from the meter Main display k left sub display k middle sub display k right sub display k main...

Страница 20: ...0 µF 10 nF 400 µF 100 nF Diode Test range 0 to 2000 mV 1 mV test current 1 5 mA max at 1 KOhm forward voltage max 2 0 V 40 Mode Measuring Range Accuracy Resolution DC 400 mV 0 3 1dgt 100 µV Voltage 4 V 1 mV 40 V 10 mV 400 V 100 mV 1000 V 0 5 1dgt 1 V AC 400 mV 0 8 3dgts 100 µV Voltage 4 V 1 mV 40 V 10 mV 400 V 100 mV 750 V 0 8 3dgts 1 V valid at a frequency of 40 Hz to 10 KHz DC 400 µA 1 0 1dgt 0 ...

Страница 21: ... 42 7 3 Max Input Limits Voltage Measurement 1000 VDC or 750 VACrms Current Measurement 20 A DC AC A range 400 mA AC DC in the mA range Mode MeasuringRange Accuracy Resolution Frequency 4 KHz 1 0 1dgt 1 Hz 40 KHz 10 Hz 400 KHz 100 Hz 4 MHz 1 KHz 40 MHz 10 KHz Sensitivity 1 Vrms Temperatur 40 C to 200 C 3 5dgts 1 C 200 C to 1200 C 3 2dgts 1 C Power Measurement AC Current max 16 A 2 5dgts AC Voltage...

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