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USER'S
MANUAL

BM251s
BM252s
BM255s
BM257s

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Summary of Contents for BM251s

Page 1: ...USER S MANUAL BM251s BM252s BM255s BM257s ...

Page 2: ...III 600V and CAT IV 300V AC DC Terminals to COM measurement category V mA A A Category II 1000V CAT III 600V and CAT IV 300V AC DC Per IEC61010 1 2nd Ed 2001 Measurement Category Measurement Category IV CAT IV is for measurements performed at the source of the low voltage installation Examples are electricity meters and measurements on primary overcurrent protection devices and ripple control unit...

Page 3: ...the open circuit voltage is above the protection fuse voltage rating Suspected open circuit voltage should be checked with voltage functions Never attempt a voltage measurement with the test lead inserted into the A mA or A input jack Only replace the blown fuse with the proper rating as specified in this manual Only use the test lead provided with the equipment or UL Listed Probe Assembly rated C...

Page 4: ...d Select a function 4 Input Jack for milli amp and micro amp current functions 5 Input Jack for all functions EXCEPT current A mA A functions 6 Common Ground reference Input Jack for all functions 7 Input Jack for 10A 20A for 30sec current function Analog bar graph The analog bar graph provides a visual indication of measurement like a traditional analog meter needle It is excellent in detecting f...

Page 5: ...s accurately to the effective RMS value regardless of the waveforms such as square sawtooth triangle pulse trains spikes as well as distorted waveforms with the presence of harmonics Harmonics may cause 1 Overheated transformers generators and motors to burn out faster than normal 2 Circuit breakers to trip prematurely 3 Fuses to blow 4 Neutrals to overheat due to the triplen harmonics present on ...

Page 6: ...urement reading is being displayed in AutoCheckTM mode press the RANGE or SELECT button momentarily 1 time can lock the range or function it was in Press the button momentarily repeatedly to step through the ranges or functions As Hazardous Alert When making resistance measurements in AutoCheckTM mode an unexpected display of voltage readings alerts you that the object under test is being energize...

Page 7: ...Hz Note Input sensitivity varies automatically with function range selected before activating the Hz function 6V function range has the highest and the 1000V range has the lowest It is recommended to first measure the signal voltage or current level then activate the Hz function in that voltage or current range to automatically set the most appropriate trigger level You can also press the RANGE bu...

Page 8: ...reading Continuity function is convenient for checking wiring connections and operation of switches A continuous beep tone indicates a complete wire Normal forward voltage drop forward biased for a good silicon diode is between 0 400V to 0 900V A reading higher than that indicates a leaky diode defective A zero reading indicates a shorted diode defective An OL indicates an open diode defective Rev...

Page 9: ...so use a plug adapter Bkb32 Optional purchase with banana pins to K type socket to adapt other standard K type mini plug temperature probes A mA and A Current functions Press SELECT button momentarily to toggle between DC and AC Last selection will be saved as power up default for repeat measurement convenience ...

Page 10: ... or earth connections Probe Contact EF Detection For more precise indication of live wires such as distinguishing between live and ground connections use the Red test probe for direct contact measurements PC computer interface capabilities The instrument equips with an optical isolated interface port at the meter back for data communication Press HOLD button while turning the meter on to enable me...

Page 11: ...l remain in the range it was in the LCD turns off Press the button momentarily again to step through the ranges Press and hold the button for 1 second or more to resume auto ranging Note Manual ranging feature is not available in Hz and functions Set Beeper Off Press the RANGE button while turning the meter on to temporarily disable the Beeper feature Turn the rotary switch OFF and then back on to...

Page 12: ...heck battery fuses leads etc and replace as necessary Double check operating procedure as described in this user s manual If the instrument voltage resistance input terminal has subjected to high voltage transient caused by lightning or switching surge to the system by accident or abnormal conditions of operation the series fusible resistors will be blown off become high impedance like fuses to pr...

Page 13: ...A A Category II 1000V CAT III 600V and CAT IV 300V AC DC E M C Meets EN61326 1 2006 EN55022 EN61000 3 2 EN61000 3 3 EN61000 4 2 EN61000 4 3 EN61000 4 4 EN61000 4 5 EN61000 4 6 EN61000 4 8 EN61000 4 11 In an RF field of 3V m Capacitance function is not specified Other function ranges Total Accuracy Specified Accuracy 100 digits Performance above 3V m is not specified Overload Protection A mA 0 4A 1...

Page 14: ...eshold 1V nominal AutoCheckTM Lo Z ACV Input Impedance Initially approx 2 5k 120pF 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 15k 100V 100k 300V 250k 600V 375k 1000V Ohm RANGE Accuracy 600 0 6 000K 60 00K 600 0K 0 5 4d 6 000M 0 7 4d 60 00M 1 2 4d Open Circuit Voltage 0 45VDC typica...

Page 15: ... 10A continuous 10A to 20A for 30 sec max with 5 minutes cool down interval Logic Level Hz mV Function RANGE Sensitivity square wave 5 00 Hz 500 0 kHz 3 Vpeak 5 00 Hz 1 000 MHz 5 Vpeak Accuracy 0 03 2d Hz Line ACV DCV Current AutoCheckTM Function Sensitivity Sine RMS Range 6V 0 4V 10Hz 10kHz 60V 4V 10Hz 50kHz 600V 40V 10Hz 50kHz 1000V 400V 45Hz 1kHz 600 A 40 A 10Hz 10kHz 6000 A 400 A 10Hz 10kHz 60...

Page 16: ...epaid to 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 WARRANTY IS EXCLUSIVE AND IS IN LIEU OF...

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