BM257s - Multimeter Brymen - Free user manual and instructions
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| Product Type | Digital Multimeter |
| Brand | Brymen |
| Model | BM257s |
| Dimensions (H x W x D) | 180 x 87 x 55 mm |
| Weight (including battery) | 400 g |
| Power Supply | 9V battery (6F22 or NEDA 1604) |
| Display | 6000 counts, backlit LCD |
| True RMS | Yes |
| Auto-Ranging | Yes |
| DC Voltage Range | 600 mV to 600 V |
| AC Voltage Range | 600 mV to 600 V |
| DC Current Range | 600 µA to 10 A |
| AC Current Range | 600 µA to 10 A |
| Resistance Range | 600 Ω to 60 MΩ |
| Capacitance Range | 60 nF to 60 mF |
| Frequency Range | 60 Hz to 600 kHz |
| Temperature Measurement | Yes (thermocouple, type K) |
| Diode Test | Yes |
| Continuity Test | Yes |
| Safety Rating | CAT III 600V, CAT IV 300V |
| Overvoltage Protection | Yes (fuse and PTC) |
| Maintenance & Cleaning | Replace battery when low; clean with dry cloth; do not use solvents. |
| Spare Parts & Repairability | Battery (9V), test leads, fuse (500 mA/600V, 10 A/600V) available from Brymen. |
| General Information | Professional multimeter with data hold, relative mode, auto power off, and low battery indicator. |
Frequently Asked Questions - BM257s Brymen
How to measure AC voltage with Brymen BM257s?
Set the rotary switch to the V~ position. Insert black test lead into COM and red into V/Ω. Connect probes across the source. Read the display. Use auto-ranging for optimal range.
How to replace the battery on BM257s?
Turn off the multimeter. Remove the screws on the back cover. Lift the cover. Replace the 9V battery (6F22). Close the cover and secure screws.
What is the maximum voltage the BM257s can measure?
The BM257s can measure DC and AC voltage up to 600 V. Higher voltages may damage the meter. Safety ratings: CAT III 600V, CAT IV 300V.
How to test continuity with BM257s?
Rotate the selector to the continuity/buzzer symbol (Ω with sound waves). Insert black lead to COM, red to V/Ω. Touch probes to circuit. A beep indicates continuity (< 30 Ω).
Does the BM257s have auto-ranging?
Yes, the BM257s features auto-ranging for voltage, current, resistance, capacitance, and frequency. You can also manually select ranges using the RANGE button.
How to measure capacitance on BM257s?
Set the dial to the capacitance symbol (丨(丨). Insert red lead into V/Ω and black into COM. Discharge the capacitor completely. Connect leads and wait for reading. Use REL mode to zero for small values.
What is the accuracy of Brymen BM257s?
The BM257s has a basic DC accuracy of ±(0.5% + 2 digits). AC accuracy varies by frequency. Refer to the manual for detailed specifications.
How to use the data hold function?
Press the HOLD button to freeze the current reading on the display. Press again to release. Useful for capturing readings in hard-to-reach places.
What type of fuse does the BM257s use?
The BM257s uses two fuses: a 500 mA/600V fast blow (for low current) and a 10 A/600V fast blow (for high current). Use only Brymen specified fuses.
Can the BM257s measure temperature?
Yes, with an optional K-type thermocouple. Set the dial to °C/°F. Insert the thermocouple into the COM and V/Ω jacks (observe polarity). Read temperature on display.
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USER MANUAL BM257s Brymen
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Product information
Brand : Brymen
Model : BM257s
Category : Multimeter