USER'S MANUAL BM251 BM252 BM255 BM257 J A C K J A C K...
1) SAFETY Terms in this manual WARNING identifies conditions and actions that could result in serious injury or even death to the user. identifies conditions and actions that could cause damage or malfunction in the CAUTION instrument. This manual contains information and warnings that must be followed for operating the instrument safely and maintaining the instrument in a safe operating condition.
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. Do not touch test lead tips or the circuit being tested while power is applied to the circuit being measured.
3) 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 & features 3) Selector to turn the Power On or Off and Select a function 4) Input Jack for milli-amp and micro-amp current functions...
Average sensing RMS calibrated RMS (Root-Mean-Square) is the term used to describe the effective or equivalent DC value of an AC signal. Most digital multimeters use average sensing RMS calibrated technique to measure RMS values of AC signals. This technique is to obtain the average value by rectifying and filtering the AC signal.
AutoCheck mode (model 257 & 255 only) This innovative AutoCheck feature automatically selects measurement function of DCV, ACV or Resistance () based on the input via the test leads. ●With no input, the meter displays “Auto” when it is ready. ●With no voltage signal but a resistance below 10M...
WARNING: AutoCheck mode input impedance increases abruptly from initial 2.5kΩ to a few hundred kΩ’s on high voltage hard signals. “LoZ” displays on the LCD to remind the users of being in such low impedance mode. Peak initial load current, while probing 1000VAC for example, can be up to 566mA (1000V x 1.414 / 2.5kΩ), decreasing abruptly to approx.
Resistance, Continuity, Capacitance (model 257, 255 & 252 only), & Diode test functions 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. CAUTION Discharge capacitors before making any measurement.
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. A, mA, and A Current functions Press SELECT button momentarily to toggle between DC and AC.
*Note: When measuring a 3-phase system, special attention should be taken to the phase-to- phase voltage which is significantly higher than the phase-to-earth voltage. To avoid exceeding the voltage rating of the protection fuse(s) accidentally, always consider the phase-to-phase voltage as the working voltage for the protection fuse(s).
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. Press the button momentarily to read the MAX and MIN readings in sequence. Press the button for 1 second or more to exit CREST capture mode.
only the same type of fuse or equivalent Calibration Periodic calibration at intervals of one year is recommended to maintain meter accuracy. Accuracy is specified for a period of one year after calibration. If self-diagnostic message “C_Er” is being displayed while powering on, some meter ranges might be largely out of specifications. To avoid mis-leading measurements, stop using the meter and send it for re-calibration.
GENERAL SPECIFICATION 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 C to 40 Relative Humidity: Maximum relative humidity 80% for temperature up to 31 C decreasing linearly to 50% relative humidity at 40 Altitude: Operating below 2000m Storage Temperature: -20...
Accessories: Test lead pair; batteries installed; user’s manual; BKP60 banana plug type-K thermocouple (model 252, 255 & 257 only) Optional purchase accessories: USB interface kit BRUA-20X; Magnetic hanger BMH-01; BKB32 banana plug to type-K socket plug adaptor Electrical Specification Accuracy is given as +/- (% of reading digits + number of digits) or otherwise specified @ 23 C +/- C and less than 75% R.H.
CREST Mode (model 255 & 257 only) Temperature (model 252, 255 & 257 only) Accuracy: Specified accuracy plus 150 digits for RANGE Accuracy changes > 5ms in duration C ~ 1000 0.3% + 3d RECORD Mode (model 255 & 257 only) F ~ 1832 0.3% + 6d...
LIMITED WARRANTY BRYMEN 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.