Brymen BM2257 User Manual
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Brymen BM2257 User Manual

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USER'S
MANUAL
BM2257
BM2251
Digital
Multimeter

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Summary of Contents for Brymen BM2257

  • Page 1 USER'S MANUAL BM2257 BM2251 Digital Multimeter...
  • Page 2 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: International Symbols

    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)

  • Page 4: Product Description

    3) PRODUCT DESCRIPTION This user's manual uses only representative model(s) for illustrations. Please refer to detailed specifications for function availability to a particular model. 1) 3-5/6 digits 6000 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 mA/µA functions...

  • Page 5: Operation Note

    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. ● Long-press (a button): press for one second or more ● Short-press (a button): press momentarily and release LoZ AutoV (Model 2257 only) Inputs are made via the test lead terminals V-COM.
  • Page 6 invaluable feature for precise indication of hard signals, such as distinguishing between hot and open wires (to neutral) in electrical installation applications. ● AutoV Mode input impedance increases abruptly from an initial 2.1kΩ to a few hundred kΩ on high-voltage hard signals. “LoZ” displays on the LCD to remind the users of being in such a low impedance mode.
  • Page 7 conductors. It is ideal for tracing live wiring connections, locating wiring breakages, and distinguishing between live and earth connections.  Probe-Contact EF-Detection (Single-Pole): For more precise indications of live wires, such as distinguishing between live and ground connections, use one single test probe to test via the terminal COM by direct metal contact probing to achieve the most distinctive indications.
  • Page 8 ~Hz Line Frequency This function is only available to the ACV, VFD-ACV, DCV, A, mA, & A functions. Long- press the ~Hz button to toggle to the Line Frequency function. The input sensitivity varies according to the available function range selected on which the ~Hz function is activated. Trigger Level 0 is the highest sensitivity while Level 3 is the lowest.
  • Page 9 DCmV; ACmV; Logic F (Model 2257 only) Inputs are made via the test lead terminals V-COM. Short-press the SELECT button to select the subject functions in sequence. The last selection will be saved as power-up F selection can be left out as factory default for repeat measurement convenience.
  • Page 10  Resistance; BeepLit Continuity; BeepLit Diode; Capacitance (Model 2257 only) Inputs are made via the test lead terminals V-COM. Short-press the SELECT button to select the subject functions in sequence. The last selection will be saved as power up default for repeat measurement convenience.
  • Page 11 BeepLit Continuity ◎ This function is having an improved convenience for checking wiring connections and operation of switches. The resistance threshold is being used. A continuous beep...
  • Page 12 sound together with the display backlight flashing indicates a complete wire. Such audible and visible indications improve continuity readabilities in noisy working environments. BeepLit Diode ◎  Reading indication: Forward voltage drop (forward-biased) for a good silicon diode is between 0.400V to 0.900V. A higher reading indicates a leaky diode (defective).
  • Page 13 LCD Backlight Long-press the button to toggle the LCD backlight on and off. The LCD backlight goes off automatically after idling for approximately 16 minutes to extend battery life. Auto-ranging with Manual-ranging Override LCD “ ” turns on in auto-ranging mode by default. Short-press the RANGE button to select manual-ranging override.
  • Page 14 feature on. LCD “ ” turns on. Availability: Resistance, Continuity, LoZ AutoV, VFD Volts, Voltage, and Current functions. ◎ Significant-measurements (readings) are >5% of range in the Voltage and Current functions, or non-OL in the Resistance function. ◎ Stable-reading is a significant-measurement reading having ≤ 30 counts in difference from its two immediate preceding measurement readings.
  • Page 15 CREST mode (Model 2257 only) Short-press the CREST button to activate CREST mode (Instantaneous PEAK-HOLD) to capture Current or Voltage peak values in durations as short as 5ms. LCD & MAX turn on. The meter beeps when a new MAX (maximum) or MIN (minimum) reading is updated.

  • Page 16: Maintenance

    ◎ Shortening iAPO idling time Press-and-hold the REL button while powering on the meter can shorten the iAPO idling time to approximately 5 seconds temporarily during the power-on session. This mode is designed mainly for production verification use. ◎ Enabling PC-COMM computer interface capabilities The instrument equips with an optical isolated interface port at the meter back for data communication.
  • Page 17 Fuse use: F1 Fuse (Dimension: 6x32 mm) for µA/mA input: ASTM HV620.0.63: 0.63A/1000Vac & Vdc, IR 30kA, F fuse F2 Fuse (Dimension: 10x38 mm) for A input: Bussmann KLM-12: 12A/600V, IR 50kA for Vdc & 100kA for Vac, F fuse ASTM HV110.11A: 11A/1000V, IR 30kA, F fuse GENERAL SPECIFICATION Display: 3-5/6 digits 6,000 counts...
  • Page 18 C ~ 50 C), or otherwise specified Sensing: True RMS sensing Ingress Protection: IP40 Pollution Degree: 2 Safety: Certified per IEC/UL/EN/BSEN 61010-1 Ed. 3.1, IEC/UL/EN/BSEN 61010-2-033 Ed. 2.0, IEC/UL/EN/BSEN 61010-031 Ed. 2.0 and the corresponding CAN/CSA-C22.2 regulations to Measurement Categories: CAT III 600V and CAT IV 300V AC &...
  • Page 19 Electrical Specification Accuracy is given as (% of reading digits + number of digits) or otherwise specified @ C  5 ACV & ACA accuracies are specified from 1 % to 100 % of range or otherwise specified; Maximum Crest Factor <2:1 at full scale & <4:1 at half scale, and with frequency spectrum limited to the specified bandwidth of the AC functions for non-sinusoidal waveforms RANGE Accuracy...
  • Page 20 AutoV_ACV (Model 2257 only) RANGE Accuracy 50Hz ~ 60Hz 6.000V, 60.00V, 600.0V 1.0% + 5d Overload protection: 1100Vrms for AC; 660V for DC Not specified at <1.5VAC Threshold: ≥ 1.5VAC nominal Input Impedance: Initially approx. 2.1k, 164pF nominal; Impedance increases abruptly within a fraction of a second as display voltage is above 50V (typical).
  • Page 21 voltages typically are: 12k @100V 100k @300V 240k @600V CREST mode (Instantaneous Peak Hold) Resolution: 6000 counts Add ± 250 digits to specified accuracy for changes in duration > 1ms for VFD-ACV function; > 350μs for other Voltage and Current functions AutoHold Real-Read Accuracy: Specified accuracy ...
  • Page 22 BeepLit Diode Tester RANGE Accuracy Test Current (Typical) Open Circuit Voltage 3.000V 1.0% + 3d 0.3mA < 3.2 VDC BeepPass Indication (Short-beep): Drop Across 0.850V BeepLit Indication (Continuity) Threshold: < 0.100V Audible Indication: Beep Sound Visible Indication: LCD Backlight DC Current RANGE Accuracy Burden Voltage...
  • Page 23 Logic Level Hz (DCmV Function) Range Sensitivity (Square wave) 10.00 Hz ~ 200.0 kHz 3Vpeak Accuracy: 0.03% + 4d Line Frequency Sensitivity Available Function Trigger Level Range (Sine RMS) 10Hz - 50kHz ACV/DCV 10Hz - 1kHz 400V VFD-ACV 10Hz - 1kHz 400V 40A A...

  • Page 24: Limited Warranty

    BRYMEN's warranty does not apply to accessories, fuses, fusible resistors, spark gaps, varistors, batteries or any product which, in BRYMEN's opinion, has been misused, altered, neglected, or damaged by accident or abnormal conditions of operation or handling.

This manual is also suitable for:

Bm2251

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