Brymen BM789 Bedienungsanleitung

USER'S

MANUAL

BM789

BM786

BM785

Digital

Multimeter

1) SAFETY

This manual contains information and warnings that must be followed for operating the

meter safely and maintaining the meter in a safe operating condition. If the meter is

used in a manner not specified by the manufacturer, the protection provided by the

meter may be impaired.

Observe proper safety precautions when working with voltages above 30 Vrms, 42.4

Vpeak or 60 VDC. These voltage levels pose a potential shock hazard to the user. Do

not expose this product to rain or moisture. The meter is intended only for indoor use.

Keep your hands/fingers behind the hand/finger barriers (of the meter and the test

probe assembly, where applicable) that indicate the limits of safe access of the hand-

held parts during measurements. Inspect lead wires, connectors, and probes for

damaged insulation or exposed metal periodically. If any defects are found, replace

them immediately. Only use the test probe assembly provided with the meter or a UL

Listed test probe assembly to the same meter ratings or better.

Optional offer premium test probe assembly using silicone lead wire insulation, at

agent’s discretion, is equipped with white inner insulation layers as wear indicators.

Replace them immediately if any of the white layers has become visible.

Disconnect the test leads from the test points before changing functions.

The meter meets IEC/EN/CSA_C22.2_No./UL standards of 61010-1 Ed. 3.0, 61010-2-

030 Ed. 1.0, 61010-2-033 Ed. 1.0 to Measurement Categories CAT III 1000V and CAT

IV 600V ac & dc.

The accompanied test probe assembly meets IEC/EN/CSA_C22.2_No./UL standards

of 61010-031 Ed. 2.0 to the same meter ratings or better. The 61010-031 requires

exposed conductive test probe tips to be ≤4mm for CAT III & CAT IV ratings. Refer to

the category markings on your probe assemblies as well as on the add-on accessories

(like detachable Caps or Alligator Clips), if any, for applicable rating changes.

INTERNATIONAL SYMBOLS

Marking of Electrical and Electronic Equipment (EEE). Do not dispose of this

product as unsorted municipal waste. Contact a qualified recycler

Refer to the explanation in this Manual

Possibility of electric shock

Earth (Ground)

Meter protected throughout by Double Insulation or Reinforced insulation

Fuse

Direct Current (DC)

Alternating Current (AC)

3Three-phase Alternating Current

Application around and removal from hazardous live conductors is permitted

BRIEF INFORMATION ON MEASUREMENT CATEGORIES

Measurement Category IV is applicable to test and measuring circuits connected at

the source of the building’s low-voltage MAINS installation. Examples are

measurements on devices installed before the main fuse or circuit breaker in the

building installation.

Measurement Category III is applicable to test and measuring circuits connected to

the distribution part of the building’s low-voltage MAINS installation. Examples are

measurements on distribution boards (including secondary meters), circuit-breakers,

cables, bus-bars, junction boxes, switches, socket-outlets, stationary motors in the

fixed installation, and equipment for industrial use.

Measurement Category II is applicable to test and measuring circuits connected

directly to utilization points (socket outlets and similar points) of the low-voltage MAINS

installation. Examples are measurements on MAINS CIRCUITS of household

appliances, portable tools and similar equipment.

2) EUROPEAN DIRECTIVES

The instruments conform to EUROPEAN Low-Voltage Directive 2014/35/EU,

Electromagnetic Compatibility Directive 2014/30/EU and RoHS 2 Directive 2011/65/EU

plus amendment Directive (EU) 2015/863.

3) PRODUCT DESCRIPTION

This user's manual uses only representative model(s) for illustrations. Please refer

detailed specifications for function availability to each model.

1) 4-5/6 digits 60000 counts

display

2) Push-buttons for special

functions & features

3) Selector to turn the Power On

or Off and Select a function

4) Positive Input Jack for T2 and

mA/µA functions

5) Positive Input Jack for all

functions EXCEPT T2, A and

µA/mA

6) Common/ Negative (Ground

reference) Input Jack for all

functions EXCEPT T2

7) Positive Input Jack for A

function while Negative for T2

Analog bar-graph

The analog bar graph provides a visual indication of measurement like a traditional

analog meter needle. It is excellent in detecting faulty contacts, identifying

potentiometer clicks, and indicating signal spikes during adjustments.

4) OPERATION

Note: Before and after hazardous voltage measurements, test the voltage function on

a known source such as line voltage to determine proper meter functioning.

AutoV (LoZ) (Model 789 only)

Inputs are made via the test lead terminals V-COM. AutoV automatically selects

measurement function of DCV or ACV based on their input levels via the test leads.

The input also provides a low ramp-up impedance (LoZ) to drain ghost voltages.

◎With no input, the meter displays “Auto” when it is ready.

◎When a signal above the voltage threshold of 1V DC or AC up to the rated 1000V is

present, the meter displays the voltage value in appropriate DC or AC, whichever

larger in peak magnitude.

◎Push-button features of only HOLD, AutoHold, EF and Backlight are available in

AutoV mode.

Note:

1) Ghost-voltage Buster: Ghost-voltages are unwanted stray signals coupled from

adjacent hard signals, which confuse common multimeter voltage measurements. The

AutoV mode provides low (ramp-up) input impedance (approx. 2.1kΩ at low voltage) to

drain ghost voltages leaving mainly hard signal values on meter readings. It is an

invaluable feature for precise indication of hard signals, such as distinguishing between

hot and open wires (to ground) in electrical installation applications.

2) AutoV Mode input impedance increases abruptly from initial 2.1kΩ to a few

hundred kΩ’s on high voltage hard signals. “LoZ” displays on the LCD to remind the

users of being in such a low impedance mode. Peak initial load current, while probing

1000VAC for example, can be up to 673mA (1000V x 1.414 / 2.1kΩ), decreasing

abruptly to approx. 2.1mA (1000V x 1.414 / 670kΩ) within a fraction of a second. Do

not use AutoV mode on circuits that could be damaged by such low input impedance.

Instead, use rotary selector or high input impedance voltage modes to minimize

the test loadings for such circuits.

ACV; VFD-ACV; dBm (Model 789 only)

Inputs are made via the test lead terminals V-COM. Press the SELECT button

momentarily to select the subject functions in sequence. Last selection will be saved as

power up default for repeat measurement convenience.

Note: In dBm function, power up default reference impedance will be displayed for 1

second before displaying the dBm readings. Press dBm-



(RANGE) button

momentary to select different reference impedance of 4, 8, 16, 32, 50, 75, 93, 110,

125, 135, 150, 200, 250, 300, 500, 600, 800, 900, 1000, up to 1200



. Last selection

will be saved as power up default for repeat measurement convenience.

~Hz Line Frequency

Press the ~Hz button momentarily to switch to Line Frequency function. It is only

available to the functions as in the table below. Input sensitivity varies automatically

with the function range selected while the ~Hz function is being activated. Level 0 is the

highest sensitivity while LEVEL 3 is the lowest. Press momentarily the ~Hz (LEVEL)

button can manually select the available Trigger Levels (see table below) in sequence.

Press the ~Hz button for one-second-or-more to leave Line Frequency function.

TRIGGER

ACV/dBm/DCV/AC+DCV

VFD-ACV

A

LEVEL 0

600A

60mA

LEVEL 1

60V

6000A

600mA

10A

LEVEL 2

600V

LEVEL 3

1000V

Note: It is recommended to direct measure the signals (voltage or current) in auto-

ranging mode before activating the ~Hz function right in that range to get the most

appropriate trigger level automatically. If the ~Hz reading is unstable, select lower

sensitivity to avoid possible electrical noises. If the reading shows zero, select higher

sensitivity to measure.

DCV; DC+ACV

Inputs are made via the test lead terminals V-COM. Press the SELECT button

momentarily to select the subject functions in sequence. Last selection will be saved as

power up default for repeat measurement convenience.

DCmV; ACmV; DC+ACmV; Logic-level Hz; Logic-level Duty %; dBm (Model 789

only)

Inputs are made via the test lead terminals V-COM. Press the SELECT button

momentarily to select the subject functions in sequence. Last selection will be saved as

power up default for repeat measurement convenience.

Note: In dBm function, power up default reference impedance will be displayed for 1

second before displaying the dBm readings. Press dBm-



(RANGE) button

momentary to select different reference impedance of 4, 8, 16, 32, 50, 75, 93, 110,

125, 135, 150, 200, 250, 300, 500, 600, 800, 900, 1000, up to 1200



. Last selection

will be saved as power up default for repeat measurement convenience.

Resistance; BeepLitTM Continuity; nS Conductance (Models 789 & 786

only)

Inputs are made via the test lead terminals V-COM. Press the SELECT button

momentarily to select the subject functions in sequence. Last selection will be saved as

power up default for repeat measurement convenience.

◎

BeepLitTM Continuity

This function is having improved convenience for checking wiring connections and

operation of switches. Resistance threshold is being used. A continuous beep tone

together with display backlight flashing indicate a complete wire. Such audible and

visible indications improve continuity readabilities in noisy working environments.

◎nS Conductance (Models 789 & 786 only)

nS Conductance is the inverse of Resistance. That is, S=1/



or nS=1/G



. It virtually

extends the Resistance measurements to the order of Giga-Ohms for leakage

measurements.

Note: Using Resistance, BeepLitTM Continuity or nS Conductance function in a live

circuit will produce false results and may damage the meter. In many cases, the

suspected component(s) must be disconnected from the circuit to obtain an accurate

measurement reading.

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