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Summary of Contents for Brymen BM780 Series
- Page 1 USER'S MANUAL BM789 BM785 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 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 3) PRODUCT DESCRIPTION This user's manual uses only representative model(s) for illustrations. Please refer detailed specifications for function availability to each model. 1) 4-5/6 digits 60000 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 T2 and mA/µA functions...
- Page 5 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.
- Page 6 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. AutoV (LoZ) (Model 789 only) Inputs are made via the test lead terminals V-COM. AutoV automatically selects measurement function of DCV or ACV based on their input levels via the test leads.
- Page 7 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 indication of hard signals, such as distinguishing between hot and open wires (to ground) in electrical installation applications.
- Page 8 135, 150, 200, 250, 300, 500, 600, 800, 900, 1000, up to 1200 . Last selection will be saved as power up default for repeat measurement convenience. ~Hz Line Frequency Press the ~Hz button momentarily to switch to Line Frequency function. It is only available to the functions as in the table below.
- Page 9 sensitivity to measure.
- Page 10 DCV; DC+ACV Inputs are made via the test lead terminals V-COM. 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. DCmV; ACmV; DC+ACmV; Logic-level Hz; Logic-level Duty %; dBm (Model 789 only) Inputs are made via the test lead terminals V-COM.
- Page 11 Note: In dBm function, power up default reference impedance will be displayed for 1 second before displaying the dBm readings. Press dBm- (RANGE) button momentary to select different reference impedance of 4, 8, 16, 32, 50, 75, 93, 110, 125, 135, 150, 200, 250, 300, 500, 600, 800, 900, 1000, up to 1200 ...
- Page 12 Resistance; BeepLit Continuity; nS Conductance (Model 789 only) Inputs are made via the test lead terminals V-COM. 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. ◎...
- Page 13 Capacitance; BeepLit Diode Inputs are made via the test lead terminals V-COM. 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. ◎ BeepLit Diode ●Reading indication: Forward voltage drop (forward biased) for a good silicon diode is between 0.400V to 0.900V.
- Page 14 1) Discharge capacitor(s) before making capacitance measurements. Large value capacitors should be discharged through an appropriate resistance load. 2) Using BeepLit Diode or Capacitance function in a live circuit will produce false results and may damage the meter. In many cases, the suspected component(s) must be disconnected from the circuit to obtain an accurate measurement reading.
- Page 15 becomes part of the measurement isothermal block when in use, and should be included in the overall isothermal considerations to minimize erratic readings.
- Page 16 A Current -COM. Press the SELECT button Inputs are made via the input terminals momentarily to select DC, AC, DC+AC in sequence. Last selection will be saved as power up default for repeat measurement convenience of all current functions. µA Current -COM.
- Page 17 mA Current -COM. Press the SELECT button Inputs are made via the input terminals momentarily to select DC, AC, DC+AC and %4-20mA (Model 789 only) in sequence. Last selection will be saved as power up default for repeat measurement convenience of all current functions.
- Page 18 sensitivity EF-H. The meter displays “EF-H” when it is ready. If it is too sensitive for your applications, press EF button momentarily to select lower sensitivity “EF-L”. The detected Electric Field strength is indicated as a series of bar-graph segments on the display plus variable beep tones.
- Page 19 LCD Backlight Press the SELECT button for one-second-or-more to toggle the LCD backlight. The LCD backlight goes off automatically after idling for approximately 16 minutes to extend battery life.
- Page 20 Manual or Auto-ranging ” turns on by default), press the RANGE For most auto-ranging functions (LCD “ button momentarily to override and select manual-ranging. The meter will remain in the range it was in, the LCD “ ” turns off. Press the button momentarily again to select the next range.
- Page 21 misleading readings. Note: Make sure both test probes are making good contacts simultaneously when using the AutoHold feature. Single probe contact may lead to latching floating-signal readings. Removing both probes from the test points simultaneously largely avoids the mis-latching of an unwanted floating-signal. MAX/MIN/AVG Record mode Press REC button momentarily to activate MAX/MIN/AVG recording mode.
- Page 22 up the meter from APO, press the SELECT button momentarily and release, or turn the rotary switch OFF and then back on. Always turn the rotary switch to the OFF position when the meter is not in use Power-on Options ◎...
- Page 23 5) MAINTENANCE Note: 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. Do not operate with open case. Trouble Shooting If the instrument fails to operate, check batteries and test leads etc., and replace as necessary.
- Page 24 Turn the rotary knob to OFF position. Loosen 6 captive screws (2 are under the tilt stand) from the bottom housing. Lift the battery compartment cartridge. Further loosen 2 captive screws under the battery compartment cartridge. Lift the upper housing and replace with new fuse(s).
- Page 25 General Specification Display: 4-5/6 digits 60,000 counts. Polarity: Automatic Update Rate: 4-5/6 digits: Max 5 per second nominal 31 Segment Bar-graph: 50 per second max Operating Temperature: -20C to 55C continuous operating (except on A function, see Electrical Specifications below for more details) Relative Humidity: Maximum relative humidity 80% for temperature up to 31C decreasing linearly to 50% relative humidity at 55C Pollution degree: 2...
- Page 26 Special Features: AutoHold; VFD; BeepLit Continuity; Record MAX, MIN, & AVG readings; Crest (Instantaneous Peak hold) MAX & MIN readings; Relative Zero mode; Data Hold; Backlighted LCD display; BeepJack™ audible & visible input warning; %4-20mA loop current readings (Model 789 only); T1-T2 differential temperature readings (Model 789 only);...
- Page 27 AC Voltage Model 789 Model 785 RANGE Accuracy 50Hz ~ 60Hz 600.00mV , 6.0000V, 60.000V, 600.00V, 1000.0V 0.5% + 30d 0.5% + 30d 40Hz ~ 1kHz 600.00mV , 6.0000V, 60.000V, 600.00V, 1000.0V 0.9% + 30d 1.2%+30d 1kHz ~ 7kHz 600.00mV , 6.0000V, 60.000V, 600.00V 1.8% + 40d 2.0%+40d...
- Page 28 Signal peak absolute values, including DC bias, less than 1000mV peak Accuracy adds 1% @ >5kHz ~ 7kHz Bandwidth specified to 10kHz only for 600V range Input Impedance: 10M, 75pF nominal (140pF nominal for 600mV range) Residual reading less than 50 digits with test leads shorted. VFD AC Voltage RANGE Accuracy...
- Page 29 90k @ 300V 300k @ 600V 670k @ 1000V...
- Page 30 dBm (Model 789 only) Range and accuracy are subject to ACmV, ACV and reference impedance selected. Typical 600 reference impedance ranges: In ACmV: -42.22 dBm to -2.22 dBm In ACV: -17.78 dBm to 62.22 dBm Input Impedance: 10M,140pF nominal Selectable reference impedance of 4, 8, 16, 32, 50, 75, 93, 110, 125, 135, 150, 200, 250, 300, 500, 600, 800, 900, 1000 and 1200...
- Page 31 Capacitance RANGE Accuracy 1) 2) 10.00nF 1.0% + 10d 100.0nF~1000nF 1.0% + 2d 1.8% + 4d 10.00F~1.000mF 10.00mF 2.0% + 4d Accuracies with film capacitor or better Temperature Coefficient: 0.20 x (specified accuracy)/ C @ (-20C ~ 18C or 28C ~ 55C) DC Current RANGE...
- Page 32 AC+DC Current Model 789 Models 785 Burden Voltage RANGE Accuracy 0Hz, 40Hz ~ 3kHz 1.0%+30d 1.0%+30d 600.00A, 6000.0A 0.2mV/A 60.000mA, 600.00mA 2.0mV/mA 1.2%+40d 1.2%+40d 6.0000A, 10.000A 30mV/A Accuracy unspecified @ <10% of range 10A continuous up to ambient 40 C only, and is <3 mins on per >15 mins off @ 40 C;...
- Page 33 Sensitivity: >3.0Vp square wave...
- Page 34 ~ Hz Line Level Frequency Function RANGE Sensitivity (Sine RMS) Range 0.4V 10Hz ~ 50kHz 10Hz ~ 50kHz 600V 10Hz ~ 30kHz 1000V 400V 10Hz ~ 5kHz VFD 600V 10Hz ~ 400Hz VFD 1000V 400V 10Hz ~ 400Hz 10Hz ~ 5kHz 600A 40A 10Hz ~ 5kHz...
- Page 35 RECORD mode (MAX MIN AVG) REC Nominal Function Mode Added Uncertainty Min. Volts/Amps Update Rate per Where Available to Specified Accuracy Signal Duration Second 300ms 30d 5 (10 460ms 300d (80d 2) 3) 800ms 180d DC+AC 300d Subject to Cx Values Hz, T1-T2 Ω, T1, T2, Others Specified at Range Locked (Manual-ranging)
- Page 36 - NOTE -...
- Page 37 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.
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