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Elma Instruments 25 Series User Manual

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Elma 257s
Elma 25x
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Summary of Contents for Elma Instruments 25 Series

  • Page 1 Elma 257s Elma 25x User manual https://www.elso.sk/product.php?id_product=3221...
  • Page 2 Elma BM 251-252-255-257 side 34 English usermanual Elma 251-252-255-257 Safety Terms in this manual WARNING identifies conditions and actions that could result in serious injury or even death to the user. CAUTION identifies conditions and actions that could cause damage or malfunction in the instrument.

  • Page 3: Cenelec Directives

    Elma BM 251-252-255-257 side 35 WARNING To reduce the risk of fire or electric shock, do not expose this product to rain or moisture. To avoid electrical shock hazard, observe the proper safety precautions when working with voltages above 60 VDC or 30 VAC rms. These voltage levels pose a potential shock hazard to the user.

  • Page 4: Product Description

    Elma BM 251-252-255-257 side 36 Product description Note: Top of the line model is used as representative for illustration purposes. Please refer to your respective model for function availability. 1) 3-5/6 digits 6000 counts LCD display 2) Push-buttons for special functions &...
  • Page 5 Elma BM 251-252-255-257 side 37 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. Average sensing RMS calibrated RMS (Root-Mean-Square) is the term used to describe the effective or equivalent DC value of an AC signal.

  • Page 6: Operation

    Elma BM 251-252-255-257 side 38 50 and 60Hz in DCV function. If neither NMRR nor CMRR specification is specified, a DMM's performance will be uncertain. Operation CAUTION Before and after hazardous voltage measurements, test the voltage function on a known source such as line voltage to determine proper meter functioning.
  • Page 7 Elma BM 251-252-255-257 side 39 Note: Range-Lock and Function-Lock Feature: When a measurement reading is being displayed in AutoCheck 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.
  • Page 8 Elma BM 251-252-255-257 side 40 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.
  • Page 9 Elma BM 251-252-255-257 side 41 CAUTION Discharge capacitors before making any measurement. Large value capacitors should be discharged through an appropriate resistance load. 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 disconnected from the circuit to obtain an accurate reading Continuity function is convenient for checking wiring connections and operation of switches.
  • Page 10 Elma BM 251-252-255-257 side 42 Note: Be sure to insert the banana plug K-type temperature bead probe Bkp60 with correct polarities. You can also use a plug adapter Bkb32 (Optional purchase) with banana pins to K-type socket to adapt other standard K type mini plug temperature probes. µ...
  • Page 11 Elma BM 251-252-255-257 side 43 Non-Contact EF-Detection: ● An antenna is located along the top-right end of the meter, which detects electric field surrounds current-carrying conductors. It is ideal for tracing live wiring connections, locating wiring breakage and to distinguish between live or earth connections.
  • Page 12 Elma BM 251-252-255-257 side 44 5ms CREST capture mode Press CREST button momentarily to activate CREST (Instantaneous Peak-Hold) mode to capture voltage or current signal duration as short as 5ms. The LCD “C” & “MAX” turn on. The meter beeps when new MAX (maximum) or MIN (minimum) reading is updated. Press the button momentarily to read the MAX and MIN readings in sequence.

  • Page 13: Maintenance

    Elma BM 251-252-255-257 side 45 Disabling Auto-Power-Off Press the SELECT button while turning the meter on to temporarily disable the Auto- Power-Off (APO) feature. Turn the rotary switch OFF and then back on to resume. Maintenance WARNING To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input jacks and turn OFF the meter before opening the case.
  • Page 14 Elma BM 251-252-255-257 side 46 Battery and Fuse replacement: Loosen the screw from the access cover of the case bottom. Lift the access cover. Replace the batteries or fuse. Re-fasten the screw. https://www.elso.sk/product.php?id_product=3221 Generel specifications Display: 3-5/6 digits 6,000 counts Update Rate: 5 per second nominal 24 Segments Bar graph: 40 per second max Operating Temperature: 0...
  • Page 15 Elma BM 251-252-255-257 side 47 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: uA &...

  • Page 16: Electrical Specifications

    Elma BM 251-252-255-257 side 48 Electrical specifications Accuracy is given as +/- (% of reading digits + number of digits) or otherwise specified @ C +/- 5 C and less than 75% R.H. True RMS model elma257 ACV & ACA accuracies are specified from 5 % to 100 % of range or otherwise specified.
  • Page 17 Elma BM 251-252-255-257 side 49 DC Voltage RANGE Accuracy 60,00mV 0,4%+5d 600.0mV 0.2%+3d 6.000V, 60.00V, 600.0V, 1000V NMRR: > 60dB @ 50Hz/60Hz CMRR: > 100dB @ DC, 50Hz/60Hz; Rs=1kΩ Input Impedance: 10MΩ, 50 pF nominal AutoCheck _DCV (elma255 & elma257 only) RANGE Accuracy 1.000V ~ 1000V...
  • Page 18 Elma BM 251-252-255-257 side 50 Diode Tester RANGE Accuracy 1.000V 1.0% + 3d Test Current: 0.56mA typically Open Circuit Voltage: < 1.8VDC typically DC Current RANGE Accuracy Burden Voltage 600,0µA 0,5%+5d 0,10mV/µA 6000µA 0,5%+3d 60,00mA 0,5%+5d 1,7mV/mA 600,0mA 0,5%+3d 6,000A 1,2%+6d 0,03V/A 8,00A...
  • Page 19 Elma BM 251-252-255-257 side 51 Hz (Line) @ ACV, DCV, Current & AutoCheck Sensitivity Function Range (Sine RMS) 0.4V 10Hz - 10kHz 10Hz - 50kHz 600V 10Hz - 50kHz 1000V 400V 45Hz - 1kHz 10Hz - 10kHz 600µA 40µA 10Hz - 10kHz 6000µA 400µA 60mA...

  • Page 20: Limited Warranty

    Elma BM 251-252-255-257 side 52 Limited Warranty elma warrants to the original product purchaser that each product it manufactures will be free from defects in material and workmanship under normal use and service within a period of one year from the date of purchase. BRYMEN's warranty does not apply to accessories, fuses, fusible resistors, spark gaps, 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.

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