Conrad M 3860-M Operation Manual

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Digital-Multimeter M 3860-M

Order No.: 12 39 00

The proper operation of the measuring unit includes:

• measurement of DC voltage up to 1000 VDC max.

• measurement of AC voltage up to 750 VAC.

• measurement of DC and AC current to 20 A (fused)

• measurement of resistance to 40 MΩ max.

• measurement of capacitance of 400 µF

• continuity check, diode and transistor test, logic test

• measurement of frequency to 40 MHz max.

• measurement of temperatures from -40 °C to +1200°C max.

• CMOS-signal output to 10.24 KHz in 10 steps

• it is not allowed to operate the unit in wet or damp environment!

• any other usage as described above is forbidden

Attention!

Read before Operation!

Read this manual carefully and completely. In the case of damage cau-

sed by non-observance of the instruction, the claims under guarantee

lapse. No legal liability can be accepted for any damage from the multi-

meter being used for the wrong purpose or operated improperly. We

cannot take any liability for consequential damage.

Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Safety Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3. Description of the Control Elements . . . . . . . . . . . . . . . . . . . . . . . . 6

4. Usage of the Multimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5. Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6. Maintenance and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7. Technical Data and Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

1. Introduction

This Mulitmeter is equipped with several special features and useful fun-

ctions which are indispensable for electrical and electronic measure-

ment: back-light, illuminates display in poor lighting conditions during

measurement, or the quadro-display, a multiple display with four simul-

taneous reading outputs e.g. during "POWER" measurement display of

real power input, current input of the consumer, AC voltage and power

factor (Cos Phi).

AUTO RANGE always selects the correct measuring range, to archieve

best accuracy. The function REL allows the operator to measure value

with respect to a preset reference value, in the secondary displays the

Offset is shown, the deviation in ± % and the preset reference value and

the main display shows the present measuring value. With the function

CMP, comparative measurement can be made, the upper and the lower

limit can be deﬁned. With the function MEM (for Memory = store) and

RCL (for Recall), 10 measurements can be stored in memory and recalled.

AUTO-POWER-CUT-OFF extends the life of the battery by turning off the

meter (Stand-by) if neither the rotary function switch nor a button is

operated for 12 minutes.

The DMM can be used for hobby, industry (with restrictions) and school.

etc.

2. Safety Rules

• The multimeter M-3860M is EMC-tested and corresponds to the fol-

lowing EG-standard: 89/336/EWG

• This unit is constructed and checked according to DIN 57 411

Page

Part 1/VDE 0411 Part 1, Safety Requirement for Electronic Measuring

Units. This 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 exceed 4000 VA. It is not allo-

wed to use the unit for installations in the overload range III according

Table of Contents

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Summary of Contents for Conrad M 3860-M

Page 1: Safety Rules
1. Introduction Digital-Multimeter M 3860-M This Mulitmeter is equipped with several special features and useful fun- Order No.: 12 39 00 ctions which are indispensable for electrical and electronic measure- ment: back-light, illuminates display in poor lighting conditions during The proper operation of the measuring unit includes: measurement, or the quadro-display, a multiple display with four simul- taneous reading outputs e.g.
Page 2 to IEC 664. The unit and the measuring cables are not protected Such voltage might cause a life-dangerous electrical shock when elec- against arcing (IEC 1010-2-031, section 13.101). trical conductors are touched. First switch off voltage source, connect the measuring unit with the terminals of the voltage source to be measured, set the measuring •...
Page 3 • If there are doubts whether a safe usage is still possible the unit has 6. DOWN Button to be put out of operation and be secured against unintentional use. This key is needed in the manual range mode to select the next lower range.
Page 4 Attention! 33. CAP = Capacitance CAP is for Capacitance => Measurement of capacitors Observe the max. input limits. 34. hFE This symbol indicates the transistor test. 19. Data Hold D-H Data Hold means the meter will “freeze“ a display reading. 35.
Page 5 Attention! 4.4 Operation 4.4.1 Basic Settings Never use the measuring unit before the cover has been closed comple- tely, to avoid an electrical shock! Hint! Never leave empty batteries in the measuring unit, as even corrosion- free batteries might leak and chemicals could be released, which are The numbers which are put in brackets in the following text refer to detrimental to your health and disturb the battery compartment.
Page 6 • In the function mode R-H simply press button again to exit. sistor socket as in the drawing according to transistor type, remove voltage before measurement. • In the function mode A-H (MIN-MAX and AVG) the R-H symbol (for b) Capacity- and Temperature Measuring Socket (poles “+“ and “-“) manual range setting) and the A-H symbol is displayed.
Page 7 LOGIC = Logic Test - no function mode possible f) COM = Common Input Terminal For all measurements, except capacity, temperature and transistor measurement, the Black test-lead must be connected. (common-ter- /Ohm = acoustic continuity test - no Auto-Range during continuity minal means minus or “-“...
Page 8 return from this function mode, press Set/Reset key twice (RESET) and display will show the difference in %, the middle sub-display will you will return to Auto Range. show the offset and the right sub-display the preset reference. e) Auto Hold A-H g) MEM (= Memory) In this function the meter will automatically record the minimum and Up to 10 measurements (reference number 0 to 9) can be stored and...
Page 9 recalled value (ref. no. 1) on the middle sub-display and 3rd recalled acoustic or visual test (display of measurement) is possible. An acou- value (ref. no. 2) on the right sub-display. stic signal is emitted at resistors below 40 Ohm. c) Negative Polarity i) CMP (= Comparison) Shows if test-leads are confused or indicates negative input with a “-“...
Page 10 = Centigrade Degree Each of the ﬁve voltage ranges presents an input impedance of 10 MOhm = Fahrenheit Degree (in parallel with < 100 pF). AC-voltage input is AC-coupled. µF = Microfarad (exp.-6) = Nanofarad (exp.-9) As soon as “ - “ is set before the display value during DC voltage measu- KOhm = Kiloohm (exp.3) rement, the voltage is negative (or the test leads are confused).
Page 11: Current Measurement
designed for 250 V max. Never measure currents exceeding 20 A. Only measure in circuits which are fused with 16 A or in which powers exceeding 4000 VA could not exist. Current measurements of 20 A may not last longer than 30 seconds and may only be executed in intervals of 15 minutes.
Page 12: Resistance Measurement
to the object to be measured. If the line resistance is less than 40 Ohm 5.4 Resistance Measurement a test buzzer sound is emitted. Attention! Attention! Make sure all objects, circuits and components under test are without voltage! Never measure capacitors which carry voltage, as a possible discharge could destroy your measuring unit.
Page 13: Diode Test
3. Connect the test-lead tips with the frequency source (generator, etc.). built in, must be without voltage. All existing capacities must be discharged. Hint! Hint! For most accurate measurements, we strongly recommend to use a BNC- During diode test the middle sub-display is active: cable (Conrad Electronic offers adapter).
Page 14: Capacitance Measurement
Follow these steps to measure capacitance: 1. Discharge each capacitor before testing. Never attempt to measure the capacitance of a charged capacitor, you might damage your multimeter. 2. Set the rotary function switch (10) to “CAP“ 3. Measurements are only possible with the connector in the unit. For polarized capacitors (unipolar) be sure to observe the correct polarity (“+“...
Page 15: Temperature Measurement
To measure the hFE-parameter (of ampliﬁcation) of a transistor follow play the present reading is taken 1 second later, the middle display the these steps: reading is taken 2 seconds later and in the right display the reading appears 3 seconds later. This means the left sub-display shows the mea- 1.
Page 16: Logic Test
5.10 Usage of the Analogous Bargraph In the mode “LOGIC“ it is not possible to select function modes with “FUNC“ button! The bargraph is easy to use and to understand. Is is comparable with the needle of an analogous measuring instrument, but without its mechani- Attention! cal disadvantages.
Page 17 To measure the real power of Cos Phi, to programme the price of KWh and to measure KWh follow these steps: 1. Connect the measuring adapter to the meter as described before. 2. Set the rotary function switch to position “POWER“ and turn on the unit.
Page 18 3. Turn on the multimeter 5.14 Usage of the Mulitmeter in connection with a Personal Computer 4. In the basic function mode the reference number is 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“...
Page 19: Technical Data
BYTE 1 2 3 4 5 6 7 8 9 A B C D E Attention! Example 1) DC - 3. 9 9 9 V CR Example 2) 3. 9 9 9 MOh m CR Do not use abrasive detergents, gasoline, alcohol or similar. These chemicals could damage the surface of the measuring unit.
Page 20 Mode Measuring Range Accuracy Resolution Mode Measuring Range Accuracy Resolution 100 µV 100 µA 400 mV +/-(0.3%+1dgt) 400 mA +/-(1.5%+3dgts) 0.1 µA Voltage ———”——— 1 mV Current 40 Hz - 1 kHz 40 V ———”——— 10 mV 400 V ———”——— 100 mV 400 mA +/-(2.5%+3dgts)
Page 21 Resistance Measurement . : 40 MOhm overload protection: 250 V DC/ACrms Mode Measuring Range Accuracy Resolution Frequency Measurement . : 40 MHz with max 750 V DC/ACrms input Frequency 4 KHz +/-(1.0%+1dgt) 1 Hz voltage 40 KHz ———”——— 10 Hz 400 KHz ———”———...

Conrad M 3860-M Operation Manual

Table of Contents

2. Safety Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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