The BK Precision Model 1688A manual provides detailed instructions for setting up, operating, and troubleshooting a 3 to 14 Volt DC power supply, including safety precautions and equipment protection measures. It covers aspects such as power supply hook-up, current limiting, and connecting supplies in series or parallel, while also offering guidance on maintenance tasks like fuse replacement and voltage adjustments.
Manual Overview
The B+K Precision Model 1688A is a DC power supply designed for bench powering automotive and marine electronic equipment. It provides an adjustable output voltage from 3 to 14 volts and a maximum current of 20 amps at higher voltages, reducing to 4.5 amps at 3 volts. The power supply is equipped with foldback current limiting to protect against short circuits and overloads. It features thermostatically controlled fan cooling to maintain reliability and prevent overheating. The unit’s output is isolated from the chassis and earth ground, allowing flexible connections, including the option to strap positive or negative outputs to ground. For troubleshooting, the manual includes guidance on voltage and current meter adjustments, as well as board-level maintenance such as fuse replacement and line voltage conversion. Safety precautions emphasize the use of a polarized 3-wire AC outlet to ensure proper grounding and reduce shock hazards. The manual advises against blocking ventilation openings to prevent internal heat buildup.
Quick Issues Covered
- Diagnose power-up failures with voltage and current meter readings.
- Calibrate voltage and current meters for accurate output monitoring.
- Use schematics for circuit tracing and troubleshooting connections.
Overview
The B+K Precision Model 1688A is a high-quality DC power supply designed for bench powering of automotive and marine electronic equipment. It provides an adjustable output voltage from 3 to 14 volts and a maximum current output of 20 amps at 13.8 to 14 volts, reducing to 4.5 amps at 3 volts. The power supply features thermostatically controlled fan cooling for improved heat dissipation and reliability. It includes foldback current limiting to protect against accidental short circuits and overload conditions. The output is isolated from the chassis and earth ground, allowing flexible connections. The manual covers safety precautions, operating instructions, maintenance, and specifications for the power supply.
Specifications
- OUTPUT VOLTAGE
- OUTPUT CURRENT
- POWER REQUIREMENTS
- POWER CONSUMPTION
- TEMPERATURE RANGE & HUMIDITY
- LOAD REGULATION
- LINE REGULATION
- RIPPLE & NOISE
- PROTECTION
- METERING
- DIMENSIONS
- WEIGHT
- ACCESSORIES SUPPLIED
Controls & Indicators
The front-panel controls and indicators for the BK Precision Model 1688A DC Power Supply include:
1. POWER Switch: Turns the power supply on and off, with a pilot lamp above the switch indicating power on.
2. Power ON light: Illuminates when the power is turned on.
3. OVERLOAD Indicator: Lights up when an overload condition exists.
4. VOLTAGE Control: Adjusts the output voltage, with the value read on the V Meter.
5. A Meter: Indicates output current on a 0 to 30 amp scale.
6. V Meter: Indicates output voltage on a 0 to 20 volt scale.
7. OUTPUT “+” Terminal (Red): Positive polarity output terminal.
8. OUTPUT “—” Terminal (Black): Negative polarity output terminal.
9. TIE POINTS (2A MAX): Red terminals are positive, and black terminals are negative, with a load limit of 2 amperes.
Installation / Setup
The source does not provide specific information about the installation or setup process, including wiring, clearances, calibration, or prerequisites for the BK Precision Model 1688A DC power supply.
Operation
The BK Precision Model 1688A DC Power Supply is designed for bench powering of automotive and marine electronic equipment. It provides an adjustable output voltage ranging from 3 to 14 volts DC, with a maximum current output of 20 amps at 13.8 to 14 volts, reducing to 4.5 amps at 3 volts. The power supply features thermostatically controlled fan cooling for heat dissipation, foldback current limiting for protection against short circuits and overloads, and isolated outputs for flexible connections. It includes two panel-mounted meters for monitoring output voltage and current. The power supply is suitable for powering car radios, sound systems, tape systems, PA systems, and low-to-medium power 2-way radios.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Normal use of test equipment, such as the BK Precision Model 1688A DC Power Supply, involves certain risks of electrical shock due to the presence of high voltage. A shock causing 10 milliamps of current through the heart can be fatal, and voltages as low as 35 volts can be dangerous. To mitigate these risks, the following precautions should be observed:
1. Use a polarized 3-wire AC outlet to ensure the power supply chassis and case are connected to a good earth ground, reducing shock danger.
2. Be aware of potential shock hazards when testing equipment with a “hot chassis” or when equipment is powered up and uses high voltage.
3. Discharge high-voltage capacitors before making connections or tests, as some circuits retain high voltage even when turned off.
4. Avoid exposing high voltage unnecessarily. Remove housings and covers only when necessary, and turn off equipment while making test connections in high-voltage circuits.
5. Ensure proper air flow around the power supply to prevent internal heat build-up, and do not block the fan opening or place objects on top of the power supply.
Download MANUAL Manual (PDF – 685.7 KB)
Bk Precision 1688A Manual: Provides instructions for troubleshooting and calibrating the 1688A power supply. File size: 685.7 KB.
- Brand: Bk-precision-1688a-instruction
- Model: MANUAL
- Type: Manual
- File size: 685.7 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-1688a-instruction MANUAL Overview
The Bk-precision-1688a is a versatile digital multimeter designed for accurate measurement of electrical parameters in various applications. Ideal for both professionals and hobbyists, this device provides reliable readings for voltage, current, resistance, and continuity testing. Its compact design and user-friendly interface make it an essential tool for troubleshooting, maintenance, and electrical diagnostics.
Main Features and Specifications
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD for clear readings in low-light conditions
- Auto and Manual Ranging modes for flexible measurement options
- Data Hold function to freeze readings for easy recording
- Overload protection on all ranges to prevent damage
- Battery powered with low battery indicator
- Compact and ergonomic design for comfortable handling
Basic Usage and Operation Tips
Before using the Bk-precision-1688a, ensure the device is powered on and the test leads are properly connected. Select the appropriate measurement mode and range based on the parameter you intend to measure. When measuring voltage or current, always connect the test leads in parallel or series with the circuit respectively. Use the Data Hold button to freeze the current reading if needed. After completing measurements, turn off the device to conserve battery life.
Troubleshooting and Maintenance
If the device displays erratic readings or fails to power on, check the battery level and replace it if necessary. Inspect test leads for damage or wear and replace them if faulty. Clean the device regularly with a soft, dry cloth; avoid using solvents or abrasive materials. If the multimeter experiences persistent issues, consult the manual or contact authorized service centers for repair.
Safety Reminder
Always observe safety precautions when working with electrical equipment. Do not exceed the maximum input limits specified in the manual to avoid electric shock or damage to the device. Use insulated test leads and avoid contact with live circuits. Ensure the multimeter is set to the correct measurement mode before testing to prevent inaccurate readings or harm.