The manual for the B+K Precision Model 1686A DC Power Supply provides detailed instructions on setting up and operating the device, which includes adjusting the output voltage and monitoring it with built-in meters, as well as ensuring safety through proper grounding and observing precautions against electrical shock. It also offers troubleshooting guidance, such as handling overload conditions and ensuring adequate ventilation to prevent overheating, while emphasizing the importance of reading the entire manual for effective use.
Manual Overview
The B+K Precision Model 1686A DC Power Supply is designed for bench powering automotive and marine electronic equipment, offering an adjustable output voltage from 3 to 14 volts with a maximum current of 12 amps at higher voltages. It features foldback current limiting to protect against short circuits and overloads. The output is isolated from the chassis and earth ground, allowing flexible connections, and can be strapped for positive or negative ground systems. The power supply includes a thermostatically controlled fan for heat dissipation. Troubleshooting involves checking the power switch, overload indicator, and ensuring proper ventilation to avoid overheating. Calibration is achieved through the voltage and current meters, which should be monitored continuously. The manual emphasizes safety precautions, such as using a polarized 3-wire AC outlet and avoiding floating the output to more than 100 volts peak with respect to earth ground. The power supply is protected against reverse polarity, overvoltage, and short circuits, but users should ensure correct polarity and avoid blocking ventilation to maintain stability and reliability.
Quick Issues Covered
- Diagnose power-up failures with overload indicator and protection features.
- Calibrate output voltage using front panel voltage control and V meter.
- Trace circuits with provided schematics for effective troubleshooting.
Overview
The B+K Precision Model 1686A is a DC power supply designed for bench powering of automotive and marine electronic equipment. It offers an adjustable output voltage range from 3 to 14 volts and a maximum current output of 12 amps at 13.8 to 14 volts, reducing to 2.5 amps at 3 volts. The power supply features thermostatically controlled fan cooling, foldback current limiting for protection against short circuits and overloads, and isolated output from chassis and earth ground for flexible connections. It includes two panel-mounted meters for monitoring output voltage and current. The manual provides safety precautions, operating instructions, and specifications to ensure effective and safe use of the power supply.
Specifications
- Ammeter Range: 0 to 20A
- Ammeter Accuracy: +7% FS
- Output Voltage: 3 to 14 VDC, Adjustable
- Output Current: Proportional to Output Voltage; 3V 2.5A, 5V 45A, 12V 10.0A, 13.8V 12.0A, 14V 12.0A
- Power Requirements: 115/230 VAC +10%, 50/60Hz
- Power Consumption: 400 W
- Temperature Range & Humidity Operation: 0° to +40°C < 85% R.H.
- Temperature Range & Humidity Storage: -15° to +70°C < 75% R.H.
- Load Regulation (0 to Rated Current): <0.8%
- Line Regulation (108-132 VAC): <0.8%
- Ripple & Noise: <10mV rms
- Dimensions (HxWxD): 4.9×8.5×11.5" (124 x 216 x 292mm)
- Weight: 12.1 lb. (5.45 kg)
- Protection: Current Limiting (Foldback), Reverse Polarity, Overvoltage, Short Circuit
- Voltmeter Range: 0 to 20V
- Voltmeter Accuracy: +7% FS
- Accessories Supplied: Instruction Manual, Spare Fuse
Controls & Indicators
The front-panel controls and indicators for the Model 1686A DC Power Supply include:
– POWER Switch: Turns the power supply on and off, with a pilot lamp above the switch indicating when the power is on.
– Power ON light: Illuminates when the power is turned on.
– OVERLOAD Indicator: Lights up when an overload condition exists.
– VOLTAGE Control: Adjusts the output voltage, with the value read on the V Meter.
– A Meter: Indicates output current on a 0 to 20 amp scale.
– V Meter: Indicates output voltage on a 0 to 20 volt scale.
– OUTPUT “+” Terminal (Red): Positive polarity output terminal.
– OUTPUT “—” Terminal (Black): Negative polarity output terminal.
– TIE POINTS: Red terminals are positive (+), black terminals are negative (—), with a maximum load not exceeding 2 amperes.
Installation / Setup
The source does not contain specific information on installation or setup highlights such as wiring, clearances, calibration, or prerequisites.
Operation
The B+K Precision Model 1686A is a DC power supply designed for bench powering of automotive and marine electronic equipment. It provides an adjustable output voltage range from 3 to 14 volts with a maximum current of 12 amps at 13.8 to 14 volts, reducing to 2.5 amps at 3 volts. The power supply features thermostatically controlled fan cooling, foldback current limiting for protection against short circuits and overloads, and isolated output from chassis and earth ground. 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 radios. The front panel includes a power switch, overload indicator, voltage control, and meters for voltage and current. The rear panel includes a line cord, fuse, and fan. Safety precautions include using a polarized 3-wire AC outlet and avoiding high ambient temperatures. The power supply should not be floated to a potential greater than 100 volts peak with respect to earth ground.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Normal use of test equipment, such as the BK Precision Model 1686A DC Power Supply, involves certain risks of electrical shock, especially when testing in environments with exposed high voltage. To mitigate these risks, the following safety precautions are advised:
1. Use a polarized 3-wire AC outlet to ensure the power supply chassis and case are connected to a good earth ground, reducing the risk of electrical shock.
2. Although the power supply output itself poses little danger of electric shock, there is a significant risk if the output is connected to an external high voltage. High voltage may be present in the equipment being powered, creating a shock hazard. Caution is necessary, and the power supply should not be floated to more than 100 volts peak with respect to earth ground.
3. Follow all test instrument safety precautions to prevent contact with exposed high voltage and to steer current away from the heart in case of accidental contact.
4. Avoid exposing high voltage unnecessarily. Remove housings and covers only when necessary, turn off equipment while making test connections in high-voltage circuits, and discharge high-voltage capacitors after removing power.
5. If the equipment under test is a “hot chassis” type, ensure it is unplugged to prevent shock hazards.
6. If the equipment under test is powered up and uses high voltage, be aware that high voltage may appear unexpectedly in defective equipment.
7. If the equipment under test is off but uses high voltage in normal operation, discharge high-voltage capacitors before making connections or tests.
These precautions are essential to ensure safe operation and to minimize the risk of electrical shock during testing.
Download MANUAL Manual (PDF – 693.5 KB)
Bk-Precision 1686 Series Manual: Guides technicians in troubleshooting, calibrating, and assembling models 1686, 1686A, and 1686B.
- Brand: Bk-precision-1686-1686a-1686b-instruction
- Model: MANUAL
- Type: Manual
- File size: 693.5 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-1686 Series Instruction Manual Overview
The Bk-precision-1686 series, including models 1686, 1686a, and 1686b, are precision digital multimeters designed for accurate electrical measurements in both professional and educational environments. These devices provide reliable readings for voltage, current, resistance, and other electrical parameters, making them essential tools for troubleshooting, testing, and maintenance of electronic circuits and equipment.
Main Features and Specifications
- True RMS measurement for accurate AC readings
- Wide measurement range including DC/AC voltage, current, resistance, capacitance, and frequency
- Backlit LCD display for easy reading in low-light conditions
- Data hold and relative measurement functions
- Auto and manual ranging options
- Overload protection on all ranges
- Compact, ergonomic design with durable casing
- Battery-powered for portability
Basic Usage and Operation Tips
Before using the Bk-precision-1686 multimeter, ensure the device is powered on and the correct measurement mode is selected. Connect the test leads securely to the appropriate input jacks. When measuring voltage or current, always start with the highest range to prevent damage. Use the data hold function to freeze readings for easier recording. For resistance and continuity tests, ensure the circuit is de-energized before connecting the probes.
Troubleshooting and Maintenance
If the multimeter displays erratic readings or does not power on, check the battery 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 device experiences frequent overload warnings, verify the measurement range and input connections. For persistent issues, consult the full manual or contact authorized service centers.
Safety Reminder
Always follow safety precautions when using the Bk-precision-1686 multimeter. Do not exceed the maximum input limits specified for each measurement type. Avoid measuring live circuits when the device or test leads are damaged. Use appropriate personal protective equipment and work in a safe environment to prevent electrical shock or injury.