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USER'S
MANUAL

BM235

Revision: 5

th

March 2016

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Summary of Contents for BM231

Page 1: ...USER S MANUAL BM235 Revision 5th March 2016 ...

Page 2: ... meter ensures that the meter design has been independently tested to the latest IEC UL EN61010 1 3 0 safety standard With the CAT IV rating exceptional for this size of meter you can feel confident and safe that you can use this meter on any high energy mains rated equipment in almost any scenario The highest quality and fully rated silicone test probes have also been provided with the meter They...

Page 3: ... of safe access of the hand held parts during measurements Inspect lead wires connectors and probes for damaged insulation or exposed metal before using the meter If any defects are found replace them immediately Only use the probe assembly provided with the meter or a UL Listed Probe Assembly to the same meter ratings or better IEC 61010 031 requires exposed conductive test probe tips to be 4mm f...

Page 4: ...urement 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 wiring including cables bus bars junction boxes switches socket outlets in the fixed installation and equipment for industrial use and some other equipment s...

Page 5: ...atures 3 Selector to turn the Power On or Off and Select a function 4 Input Jack for 10A 20A for 30sec current function 5 Input Jack for all functions EXCEPT A mA A current functions 6 Common Ground reference Input Jack for all functions 7 Input Jack for A and mA current function ...

Page 6: ...mal 2 Circuit breakers to trip prematurely 3 Fuses to blow 4 Neutrals to overheat due to the triplen harmonics present on the neutral 5 Bus bars and electrical panels to vibrate Crest Factor Crest Factor is the ratio of the Crest instantaneous peak value to the True RMS value and is commonly used to define the dynamic range of a True RMS DMM A pure sinusoidal waveform has a Crest Factor of 1 414 A...

Page 7: ...iate DC or AC whichever larger in peak magnitude Note 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...

Page 8: ...rcuits that could be damaged by such low input impedance Instead use rotary selector or high input impedance voltage modes to minimize loading for such circuits ACV DCV VFD ACV 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 VFD ACV and the associated Hz are equipped with digita...

Page 9: ...ivated under DCV ACV or VFD ACV voltage function the trigger voltage range will be displayed right before starting the Hz readings Press momentarily the RANGE button can manually select another trigger voltage range not available to current ranges It is recommended to first measure the signal voltage or current level and activate Hz function in that range to get the most appropriate trigger level ...

Page 10: ... connections and operation of switches A continuous beep tone together with flashing display backlight indicate a complete wire Such audible and visible indications improve continuity readabilities in noisy working environments CAUTION Using resistance and continuity function in a live circuit will produce false results and may damage the instrument In many cases the suspected component must be di...

Page 11: ...g indicates a shorted diode defective An OL indicates an open diode defective Reverse the test leads connections reverse biased across the diode The digital display shows OL if the diode is good Any other readings indicate the diode is resistive or shorted defective CAUTION Discharge capacitors before making any measurement Large value capacitors should be discharged through an appropriate resista...

Page 12: ...t selection will be saved as power up default for repeat measurement convenience Note Be sure to insert the banana plug type K temperature bead probe Bkp60 with correct polarities You can also use a plug adapter Bkb32 Optional purchase with banana pins to type K socket to adapt other standard type K mini plug temperature probes ...

Page 13: ...ations Flame signal current check should indicate steady flame signal of at least 2 A for a rectification type or 1 5 A for an ultraviolet type 8 A for self checking systems If a flame signal current with inadequate strength or fluctuation beyond 10 check the following to avoid the risk of unwanted flame relay dropout For gas or oil flames Minipeeper Low supply voltage Detector location Defective ...

Page 14: ...ith the ignition both on and off greater than 0 5 A indicates the presence of ignition interference Insufficient ground must be at least 4 times the detector area Flame lifting off burner head ground or not continuously in contact with the flame rod Temperature in excess of 600 o F 316 o C at the flame electrode insulator causing short to ground ...

Page 15: ...le beep tones Non Contact EF Detection An antenna is located along the top left end of the meter which detects electric field surrounding energized live conductors It is ideal for tracing live wiring connections locating wiring breakages and to distinguish between live and earth connections Probe Contact EF Detection For more precise indication of live wires such as distinguishing between Live and...

Page 16: ...ted LCD display Press the SELECT button for 1 second or more to toggle the LCD backlight The backlight will also be turned off automatically after 10 minutes to extend battery life Hold The hold feature freezes the display for later view Press the HOLD button momentarily to toggle the hold feature Relative Zero mode Relative Zero allows the user to offset the meter consecutive measurements with th...

Page 17: ...ons 2 Significant measuring readings of above 8 5 of ranges 3 Non OL readings for Resistance Continuity or Diode function 4 Non zero readings for Hz function 5 Electric field signal present for EF function 6 Significant movement indication as in Phase Rotation functions In other words the meter will intelligently avoid entering the APO mode when it is under normal measurements To wake up the meter...

Page 18: ...se bottom Lift the access cover Replace the batteries or fuse s Re fasten the screw Both fuses can be tested by inserting a probe into the A or mA uA jack If the IrEr warning message and beep is not displayed then the fuse on that input is blown Dave s Note Proper ceramic HRC High Rupture Capacity fuses are expensive but they are designed to fail safe and not explode That makes you safer Don t be ...

Page 19: ...1 and the corresponding CAN CSA C22 2 regulations to Measurement Categories CAT II 1000V CAT III 600V and CAT IV 300V AC DC Transient Protection 6 0kV 1 2 50 s surge E M C Meets EN61326 1 2013 In an RF field of 3V m Temperature function is not specified Ohm function Total Accuracy Specified Accuracy 15 digits Other functions Total Accuracy Specified Accuracy Performance above 3V m is not specified...

Page 20: ...00 of range or otherwise specified Maximum Crest Factor 2 1 at full scale 4 1 at half scale and with frequency components fall within the meter specified frequency bandwidth for non sinusoidal waveforms AC Voltage RANGE Accuracy 50Hz 60Hz 6 000V1 60 00V 600 0V 1000V 0 7 3d 45Hz 440Hz 6 000V1 60 00V 600 0V 1000V 2 0 3d Input Impedance 10M 54pF nominal 1 5d non zero residue may appear when backlight...

Page 21: ...NGE Accuracy1 45Hz 440Hz 600 0V 1000V 2 0 3d 1 Not specified at 1VAC Threshold 1VAC 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 Ended up impedances vs display voltages typically are 12k 100V 100k 300V 240k 600V 580k 1000V DC Voltage RANGE Accuracy 60 00mV 600 0mV 6 000V 0 3 2d 60 00V ...

Page 22: ... 580k 1000V Ohm RANGE1 Accuracy 600 0 6 000k 0 3 3d 60 00k 600 0k 0 5 3d 6 000M 2 60 00M 3 0 9 2d4 1 Open Circuit Voltage 1 6VDC typical 2 Constant Test Current 0 2 A Typical 3 Constant Test Current 0 02 A Typical 4 5 20d 30M BeepLit Continuity Tester Continuity Threshold Between 30 and 480 Continuity ON Response Time 15ms Audible Indication Beep sound Visible Indication LCD Backlight Capacitance ...

Page 23: ...r will be in series with your circuit under test and hence will drop voltage to your circuit based on the current drawn For example On the 600mA range if your circuit takes 500mA then the voltage to your circuit drops by 1 9mA 500 0 95V So if you have a 3 3V supply your circuit is only getting 3 3V 0 95V 2 35V and can fail to work properly or at all Obviously that s pretty much worst case at low d...

Page 24: ...30 seconds max with 5 minutes cool down interval Temperature Model 235 only RANGE Accuracy 1 2 40 0 o C 99 9o C 1 1o C 100 o C 400o C 40 0 o F 99 9 o F 1 2o F 100 o F 752 o F 1 Accuracies assume meter interior and the ambient have reached the same temperature isothermal stage for a correct junction voltage compensation Allow enough settling time for a significant change of ambient temperature It c...

Page 25: ...L Lo Sensitivity Typical Voltage Tolerance 10V 3V 19V 40V 16V 71V 20V 10V 38V 80V 32V 142V 40V 21V 79V 160V 63V 285V 80V 40V 156V 300V 105V 608V 160V 80V 500V 300V Indication Bar graph segments audible beep tones proportional to the field strength Detection Frequency 50 60Hz Detection Antenna Top left end of the meter Probe Contact EF Detection For more precise indication of live wires such as dis...

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Page 30: ...e product with proof of purchase and description of the difficulty postage and insurance prepaid 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...

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