The BK Precision Model 391A Test Bench® Handheld Digital Multimeter manual provides detailed instructions for setup, operation, and troubleshooting, including features such as true RMS reading, multiple voltage and current ranges, and safety precautions like using insulated surfaces and avoiding contact with exposed metal objects. It also covers maintenance tasks such as battery and fuse replacement, emphasizing the use of original parts and safety test leads to ensure proper functionality and user safety.
Manual Overview
The BK Precision 391A Test Bench® Handheld Digital Multimeter manual provides detailed instructions for troubleshooting, diagnostics, and maintenance. For troubleshooting, the manual emphasizes checking the fuses if current measurements are not possible. The multimeter uses two fuses: F1 for mA/µA input and F2 for the 20 A input. To check for a blown fuse, insert the test lead into the respective jack, set the function switch to a non-current position, and power on the device. If no warning tone is heard, the fuse is likely blown. Error diagnostics include a low battery indicator, shown by an “E” symbol, which appears when the battery is 90% depleted. Calibration and adjustments are not explicitly detailed, but the manual specifies manual ranging for voltage, current, and resistance measurements. Board-level guidance includes safe handling practices and the use of isolation transformers for “hot chassis” equipment. The manual also advises using only the supplied safety test leads and ensuring they are in good condition. Regular maintenance involves checking and replacing the battery and fuses as needed, with specific instructions for accessing and replacing these components.
Quick Issues Covered
- Diagnose power-up failures with fuse and battery checks.
- Identify error codes for low battery and blown fuses.
- Use schematics for circuit tracing and fault isolation.
Overview
The BK Precision Model 391A Test Bench® Handheld Digital Multimeter is a device designed for measuring various electrical parameters. It features true RMS reading, a 4-1/2 digit LCD display with large digits, and a basic accuracy of DCV +0.05%. The multimeter offers multiple ranges for voltage, current, and resistance measurements, along with functions such as logic probe, diode test, continuity tester, and data hold. It includes safety features like high energy fuses, a shock-resistant case, and safety type test leads. The manual provides instructions on safety precautions, battery replacement, and fuse replacement.
Specifications
- True RMS reading.
- 4-1/2 digit LCD display with large 0.7” digits.
- Basic accuracy; DCV +0.05%.
- Resolution of 10 pV, 10 nA, 0.01Q.
- Single function and range control.
- Auto power off prolongs battery life.
- Five de voltage ranges: 200 mV to 1000 V.
- Five ac voltage ranges: 200 mV to 750 V.
- Five de current ranges: 200 1A to 20 A.
- Five ac current ranges: 200 A to 20 A.
- Six resistance ranges: 200 Q to 20 MQ.
- Logic probe function: indicate logic high or low.
- Diode test function: measures forward voltage drop.
- Visual and audible continuity tester.
- Audible warning buzzer if probe inserted into wrong jack.
- Data hold function freezes value on display.
- Auto polarity. auto zero.
- Overrange indication on all ranges.
- High energy fuses.
- Fused 20 A range.
- Safety type test leads.
- Shock resistant case in holster withstands 10-foot drop.
- Tilt stand. Hanger strap.
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Use an insulated floor material or floor mat to stand on, and an insulated work bench surface; make certain such surfaces are not damp or wet. Keep “one hand in the pocket” while handling an instrument probe. Be particularly careful to avoid contacting a nearby metal object that could provide a good ground return path. When using a probe, touch only the insulated portion. Never touch the exposed tip portion.
Do not exceed the following input ratings. Personal injury or damage to the instrument may result:
– DC VOLTS — 1000 V (dc + ac peak)
– 500 V (dc + ac peak) on 200 mV range
– AC VOLTS 750 Vrms
– 500 V (dc + ac peak) on 200 mV range
– OHMS 500 V (dc + ac peak)
– mA 200 mA (fuse protected)
– A 20 A (fuse protected)
– Do not float more than 500 volts from earth ground.
Remove test leads before replacing batteries or fuses, and before performing any servicing on the instrument. Use only the safety type test leads supplied with the multimeter. Turn off equipment while making test connections in high voltage circuits. Discharge high-voltage capacitors after removing power.
For voltage or current measurements in high voltage equipment, do not touch equipment, meter or test leads while power is applied. If possible, familiarize yourself with the equipment being tested and the location of its high voltage points. However, remember that high voltage may appear at unexpected points in defective equipment.
Never work alone. Someone should be nearby to render aid if necessary. Training in CPR (cardiopulmonary resuscitation) first aid is highly recommended.
Download MANUAL Manual (PDF – 281.5 KB)
Bk-precision-391a-instruction manual: Guide for troubleshooting and calibrating the Bk-precision-391a model. File size: 281.5 KB.
- Brand: Bk-precision-391a-instruction
- Model: MANUAL
- Type: Manual
- File size: 281.5 KB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Bk-precision-391a-instruction MANUAL Overview
The Bk-precision-391a is a versatile digital multimeter designed for accurate measurement of electrical parameters such as voltage, current, and resistance. Ideal for both professional technicians and hobbyists, this device offers reliable performance for troubleshooting, testing, and maintenance of electronic circuits and equipment.
Main Features and Specifications
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD for clear readings in various lighting conditions
- Auto and Manual Range Selection for flexible measurement options
- Data Hold and Min/Max recording capabilities
- Overload protection on all ranges to ensure device safety
- Battery powered with low battery indicator
- Compact and ergonomic design for ease of use
Basic Usage and Operation Tips
Before using the Bk-precision-391a, ensure the device is powered with fresh batteries. Select the appropriate measurement mode and range for your application. Always connect the test leads securely and observe polarity when measuring DC voltage or current. Use the data hold function to freeze readings for easier analysis. For resistance and continuity tests, ensure the circuit is powered off to avoid damage to the meter.
Troubleshooting and Maintenance
If the meter displays erratic readings or fails to power on, check the battery condition and replace if necessary. Clean the test leads and connectors regularly to maintain good contact. Avoid exposing the device to extreme temperatures, moisture, or mechanical shock. If the display shows “OL” or overload, reduce the measurement range or disconnect the test leads immediately to prevent damage.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-391a. Do not exceed the maximum input limits specified in the manual. Avoid measuring live circuits when the device is set to resistance or continuity modes. Use insulated test leads and keep your hands away from exposed conductive parts during measurements to prevent electric shock.