The BK Precision manual for models 1653A and 1655A covers the setup and operation of isolated, variable AC power supplies, including detailed instructions on using the devices as isolation transformers, variable AC voltage sources, and for measuring electrical loads. It also provides troubleshooting guidance, emphasizing safety precautions to prevent electrical shock and ensuring proper maintenance and calibration of the equipment.
Manual Overview
The BK Precision Models 1653A and 1655A manuals provide detailed guidance for technicians working with these isolated, variable AC power supplies. The troubleshooting section emphasizes using the power supply as an isolation transformer, a variable AC voltage source, and for measuring electrical loads. Error codes and diagnostics are not explicitly detailed, but the manual advises on handling high voltage safely and the importance of grounding to prevent electrical shock. Calibration and adjustments are covered, including performance tests and calibration adjustments to ensure accurate readings. The manual provides board-level guidance for maintenance, such as fuse and auto-transformer brush replacement. Both models feature built-in meters for voltage and current measurement, with the 1655A offering additional capabilities like power line leakage testing and expanded leakage scales. Safety precautions are highlighted, stressing the importance of using insulated surfaces and the “one hand in the pocket” technique to minimize shock risk.
Quick Issues Covered
- Diagnose power-up failures with isolation transformer troubleshooting.
- Calibrate voltage output using built-in meter adjustments.
- Trace circuits with detailed schematics for models 1653A and 1655A.
Overview
The BK Precision Models 1653A and 1655A are isolated, variable AC power supplies designed for use by qualified electronics technicians. The manual covers safety precautions, features, specifications, and operating instructions for these models. It includes sections on test instrument safety, circuit description, maintenance and calibration, controls and indicators, operating instructions, precautions, troubleshooting, and customer support. The power supplies offer features such as wide voltage and current ranges, built-in meters, isolated output voltage, and soldering iron temperature control. The Model 1655A includes additional features like power line leakage test capability and expanded leakage scale.
Specifications
- VOLTAGE ADJUSTMENT RANGE: 0-150VAC, with input at 120VAC
- VOLTAGE/CURRENT SENSING: Sine wave average, calibrated in RMS
- MAXIMUM CURRENT (Isolated): 3A continuous, 4A intermittent (0-130V). Intermittent not to exceed 4 minutes at 4A followed by 5 minutes at 1A max.
- METER SCALES: Voltage: 0-150V, Current: 0-2A, 0-4A, Volt-Amps (Voltage Set to 120): 0-240VA, 0-480VA, Leakage: 0 to 5mA (5,000uA), expanded scale
- METER ACCURACY (25°C): Volts: +5% (typical) of full scale (calibrated @ 120VAC), Currents: +5% (typical)
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
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Troubleshooting & Error Codes
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Safety & Warnings
An electrical shock causing 10 milliamps of current to pass through the heart can stop most human heartbeats. Voltage as low as 35 volts dc or ac rms should be considered dangerous and hazardous since it can produce a lethal current under certain conditions. Higher voltages are even more dangerous. Your normal work habits should include all accepted practices to prevent contact with exposed high voltage, and that will steer current away from your heart in case of accidental contact with a high voltage. You will significantly reduce the risk factor if you know and observe the following safety precautions:
1. The B+K Precision Models 1655A and 1653A AC Power Supplies are sources of high voltage ac. The person using the instrument should be a qualified electronics technician or otherwise trained and qualified to work with high voltage.
2. Use only a polarized 3-wire ac outlet. This assures that the power supply chassis, case, and ground terminal are connected to a good earth ground and reduces danger from electrical shock.
3. When servicing any equipment equipped with a two-wire ac plug, treat it as “hot chassis” type and connect it to the ISOLATED OUTPUT outlet of the ac power supply. Even some equipment with a polarized plug is the “hot chassis” type.
4. Never connect two pieces of “hot chassis” equipment to ISOLATED OUTPUT outlets simultaneously. There may be a serious shock hazard between two chassis.
5. Don’t expose high voltage needlessly. Remove housings and covers only when necessary. Turn off equipment while making test connections in high-voltage circuits. Discharge high-voltage capacitors after removing power.
6. 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.
7. Use an insulated floor material or a large, insulated floor mat to stand on, and an insulated work surface on which to place equipment; and make certain such surfaces are not damp or wet.
8. Use the time proven “one hand in the pocket” technique while handling an instrument probe. Be particularly careful to avoid contacting a nearby metal object that could provide a good ground return path.
9. When testing ac powered equipment, remember that ac line voltage is usually present on some power input circuits such as the on-off switch, fuses, power transformer, etc. any time the equipment is connected to an ac outlet, even if the equipment is turned off.
10. Never work alone. Someone should be nearby to render aid if necessary. Training in CPR (cardio-pulmonary resuscitation) first aid is highly recommended.
Download MANUAL Manual (PDF – 4.0 MB)
Bk-precision-1655a-instruction manual: 4.0 MB PDF for technicians to troubleshoot and calibrate the 1655a model efficiently.
- Brand: Bk-precision-1655a-instruction
- Model: MANUAL
- Type: Manual
- File size: 4.0 MB
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-1655a-instruction MANUAL Overview
The Bk-precision-1655a is a versatile digital multimeter designed for accurate electrical measurements in both professional and hobbyist applications. It provides reliable readings of voltage, current, resistance, and continuity, making it an essential tool for troubleshooting, testing, and maintenance of electronic circuits and electrical systems.
Main Features and Specifications
- Measurement Types: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD for clear readings
- Auto and Manual Ranging for flexible measurement options
- Data Hold function to freeze displayed readings
- Max/Min recording capability for capturing signal variations
- Overload protection on all ranges to prevent damage
- Low battery indicator for timely battery replacement
- Compact, ergonomic design with a durable casing
Basic Usage and Operation Tips
Before using the Bk-precision-1655a, ensure the device is powered on and the correct measurement mode is selected. Connect the test leads securely to the appropriate input jacks and the circuit under test. For voltage measurements, use parallel connections; for current, connect in series. Always start with the highest range to avoid overloading the meter. Use the data hold button to freeze readings when needed, and refer to the manual for detailed instructions on each function.
Troubleshooting and Maintenance
If the meter displays erratic or no readings, check the test leads for damage or improper connections. Replace the battery if the low battery indicator appears or if the display dims. Clean the device regularly with a dry cloth and avoid exposure to moisture or extreme temperatures. If the meter does not function correctly after these checks, consult the manual’s troubleshooting section or contact authorized service centers.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1655a. Do not exceed the specified input limits to prevent electric shock or damage. Avoid measuring live circuits with damaged test leads or if the device casing is cracked. Use insulated gloves and eye protection when working with high voltages. Disconnect power sources before making resistance or continuity measurements to ensure user safety.