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Brymen BM789 User Manual
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Brymen BM789 User Manual

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USER'S
MANUAL
BM789
BM786
BM785
Digital
Multimeter

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Summary of Contents for Brymen BM789

  • Page 1 USER'S MANUAL BM789 BM786 BM785 Digital Multimeter...

  • Page 2: International Symbols

    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.

  • Page 3: European Directives

    Earth (Ground) Meter protected throughout by Double Insulation or Reinforced insulation Fuse Direct Current (DC) Alternating Current (AC) Three-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.

  • Page 4: Operation

    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...
  • Page 5 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.
  • Page 6 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.
  • Page 7 ~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.
  • Page 8 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.
  • Page 9 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, ...
  • Page 10  Resistance; BeepLit 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. BeepLit Continuity ◎...
  • Page 11 Capacitance; BeepLit Diode 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. BeepLit Diode ◎ ●Reading indication: Forward voltage drop (forward biased) for a good silicon diode is between 0.400V to 0.900V.
  • Page 12 1) Discharge capacitor(s) before making capacitance measurements. Large value capacitors should be discharged through an appropriate resistance load. 2) Using BeepLit Diode or Capacitance 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.
  • Page 13 Note: 1) Temperature accuracies assume meter interior has the same temperature (isothermal stage) of the ambient for a correct junction voltage compensation. Allow the meter and the type-K probe set to reach isothermal stage for a significant change of ambient temperature. It can take up to an hour for changes > 5°C.
  • Page 14 2) Beware +/- polarities of the banana-plug when using the type-K temperature bead- probe Bkp60. 3) Banana-pins to type-K socket adapter Bkb32 (Optional purchase) can be used to adapt other type-K probes with standard miniature plugs. However, the adapter becomes part of the measurement isothermal block when in use, and should be included in the overall isothermal considerations to minimize erratic readings.
  • Page 15 A Current Inputs are made via the input terminals -COM. Press the SELECT button momentarily to select DC, AC, DC+AC in sequence. Last selection will be saved as power up default for repeat measurement convenience of all current functions. µA Current Inputs are made via the input terminals -COM.
  • Page 16 mA Current Inputs are made via the input terminals -COM. Press the SELECT button momentarily to select DC, AC, DC+AC and %4-20mA (Model 789 only) in sequence. Last selection will be saved as power up default for repeat measurement convenience of all current functions.
  • Page 17 distinctive indications. LCD Backlight Press the SELECT button for one-second-or-more to toggle the LCD backlight. The LCD backlight goes off automatically after idling for approximately 16 minutes to extend battery life. Manual or Auto-ranging...
  • Page 18 For most auto-ranging functions (LCD “ ” turns on by default), press the RANGE button momentarily to override and select manual-ranging. The meter will remain in the range it was in, the LCD “ ” turns off. Press the button momentarily again to select the next range.
  • Page 19 Note: Make sure both test probes are making good contacts simultaneously when using the AutoHold feature. Single probe contact may lead to latching floating-signal readings. Removing both probes from the test points simultaneously largely avoids the mis-latching of an unwanted floating-signal. MAX/MIN/AVG Record mode Press REC button momentarily to activate MAX/MIN/AVG recording mode.

  • Page 20: Maintenance

    Power-on Options ◎ Disabling APO Press-and-hold the SELECT button while powering on the meter can disable APO feature temporarily during the power-on session. The LCD will display “dSAPO” to confirm selection before the SELECT button is released. ◎ Disabling beep tone Press-and-hold the RANGE button while powering on the meter can toggle the beep tone OFF or ON in sequence.
  • Page 21 Cleaning and Storage Periodically wipe the meter and the test probe assembly with a damp cloth and mild detergent. Do not use abrasives or solvents. Allow to dry completely before operating. If the meter is not to be used for periods of longer than 60 days, remove the batteries and store them separately.
  • Page 23 General Specification Display: 4-5/6 digits 60,000 counts. Polarity: Automatic Update Rate: 4-5/6 digits: Max 5 per second nominal 31 Segment Bar-graph: 50 per second max Operating Temperature: -20C to 55C continuous operating (except on A function, see Electrical Specifications below for more details) Relative Humidity: Maximum relative humidity 80% for temperature up to 31C decreasing linearly to 50% relative humidity at 55C Pollution degree: 2...

  • Page 24: Electrical Specifications

    readings; Crest (Instantaneous Peak hold) MAX & MIN readings; Relative Zero mode; Data Hold; Backlighted LCD display; BeepJack™ audible & visible input warning; %4-20mA loop current readings (Model 789 only); T1-T2 differential temperature readings (Model 789 only); dBm readings (Model 789 only) ELECTRICAL SPECIFICATIONS Accuracy is (% reading digits + number of digits) or otherwise specified, at 23C ...
  • Page 25 600.00V, 1000.0V Unspec'd Accuracy specified from 10% to 100% of range Bandwidth specified to 10kHz only for 600V range Accuracy specified from 30% to 100% of range Input Impedance: 10M, 75pF nominal (140pF nominal for 600mV range) Residual reading less than 50 digits with test leads shorted AC+DC Voltage Model 789 Models 786, 785...
  • Page 26 LoZ Auto-DCV (Model 789 only) RANGE Accuracy 6.0000V, 60.000V, 600.00V, 1000.0V 0.5%+30d LoZ Auto-DCV Threshold: > +1.0VDC or < -1.0VDC nominal LoZ Auto-DCV Input Impedance: Initially approx. 2.1k, 140pF nominal; Impedance increases abruptly within a fraction of a second as display voltage is above 50V (typical). Ended up impedances vs display voltages typically are: 12k...
  • Page 27 Ohms RANGE Accuracy 0.085%+10d 600.00 6.0000k, 60.000k 0.085%+4d 0.15%+4d 600.00k 1.5%+5d 6.0000M 60.000M 2.0%+5d 3) 4) 99.99nS 1.0%+10d Open Circuit Voltage: < 1.3VDC (< 1.5VDC for 600 range) Temperature Coefficient: 0.20 x (specified accuracy)/ C @ (-20C ~ 18C or 28C ~ 55C) Constant Test Current: 0.1 µ...
  • Page 28 55C) DC Current RANGE Accuracy Burden Voltage 0.075%+20d 600.00A 0.2mV/A 1) 2) 6000.0A 0.075%+20d 0.2mV/A 60.000mA 0.075%+20d 2.0mV/mA 600.00mA 0.15%+20d 2.0mV/mA 6.0000A 0.3%+20d 30mV/A 10.000A 0.3%+30d 30mV/A Specified with Open-circuit-voltage (OCV) of Current-loop-under-test at >100V. The meter shows a few negative residue counts when the input is short-circuited, with OCV at zero volt.
  • Page 29 AC Current Model 789 Models 786, 785 Burden RANGE Accuracy Voltage 40Hz ~3kHz 600.00A, 6000.0A 0.2mV/A 0.9%+20d 0.9%+20d 60.000mA, 600.00mA 2.0mV/mA 6.0000A, 10.000A 1.0%+30d 1.0%+30d 30mV/A Accuracy unspecified @ <10% of range 10A continuous up to ambient 40 C only, and is <3 mins on per >15 mins off @ 40 C;...
  • Page 30 Function RANGE Sensitivity (Sine RMS) Range 0.4V 10Hz ~ 50kHz 10Hz ~ 50kHz 600V 10Hz ~ 30kHz 1000V 400V 10Hz ~ 5kHz VFD 600V 10Hz ~ 400Hz VFD 1000V 400V 10Hz ~ 400Hz 10Hz ~ 5kHz 600A 40A 10Hz ~ 5kHz 6000A 400A 60mA...
  • Page 31 Detection Antenna: Top-left end of the meter Probe-Contact EF-Detection (Single-pole): For more precise indication of live wires, such as distinguishing between live and ground connections, use one single test probe to test via terminal COM for direct metal contact probing to achieve the most distinctive indications. RECORD mode (MAX MIN AVG) Function Mode Added Uncertainty...

  • Page 32: Limited Warranty

    BRYMEN TECHNOLOGY CORPORATION. BRYMEN assumes no risk for damage in transit. BRYMEN will, at its option, repair or replace the defective product free of charge. However, if BRYMEN determines that the failure was caused by misused, altered, neglected, or damaged by accident or abnormal conditions of operation or handling, you will be billed for the repair.

This manual is also suitable for:

Bm786Bm785