The manual for the B&K Precision Models 1653 and 1655 Isolated-Variable AC Power Supplies provides detailed instructions for setup, operation, and troubleshooting, including safety precautions for handling high voltage and using the equipment as an isolation transformer or variable AC voltage source. It also includes specific guidance on using the Model 1655 as a leakage tester and offers maintenance tips such as fuse replacement and calibration adjustments.
Manual Overview
The manual for the B&K Precision Models 1653 and 1655 Isolated-Variable AC Power Supplies provides detailed guidance on troubleshooting, error diagnostics, calibration, and board-level adjustments. For troubleshooting, the manual outlines using the power supply as an isolation transformer, a variable AC voltage source, and for electrical load measurement. It emphasizes the importance of safety, advising technicians to avoid connecting two “hot chassis” devices to isolated output outlets simultaneously to prevent shock hazards. The manual includes specific error codes and diagnostics, particularly for the Model 1655, which features a new leakage probe with a momentary contact switch for testing. Calibration and adjustments are covered, with instructions on preventive maintenance, fuse replacement, and auto-transformer brush replacement. The manual also details the use of the power supply’s built-in meter for voltage and current measurements, and provides specifications for voltage adjustment range and meter accuracy. Safety precautions are emphasized throughout, including the use of insulated materials and the “one hand in the pocket” technique to minimize electrical shock risks.
Quick Issues Covered
- Diagnose power-up failures with Model 1655 AC power supply.
- Calibration adjustments for voltage and current sensing accuracy.
- Circuit tracing using detailed schematics for fault isolation.
Overview
The product described is an isolated-variable AC power supply, specifically the B & K-Precision Models 1653 and 1655. These models are used for servicing electrical equipment by providing a variable output voltage from 0 to 150 VAC and handling output currents up to 3 amps continuous for Model 1655 and 2 amps for Model 1653. The manual covers safety precautions, features, specifications, operating instructions, maintenance, and troubleshooting. It emphasizes the importance of using the power supply safely, particularly when working with high voltage, and includes specific revisions for Model 1655 related to a new leakage probe design.
Specifications
- OUTPUT ISOLATION
- Leakage less than 0.1 mA (25°C, 50% relative humidity).
- VOLTAGE ADJUSTMENT RANGE
- 0-150 VAC, with input at 120 VAC.
- VOLTAGE/CURRENT SENSING
- Sine wave average, calibrated in RMS.
- MAXIMUM CURRENT (Isolated)
- Model 1655: 3 A continuous, 4 A intermittent (0-130 V).
- Model 1653: 2 A continuous.
- METER SCALES
- Model 1655: Voltage: 0-150 V. Current: 0-4 A. Volt-Amps (Voltage Set to 120): 0-240 VA. Leakage: 0-5 mA.
- Model 1653: Voltage: 0-150 V. Current: 0-2 A.
- METER ACCURACY (25°C)
- Model 1655: Volts: ±2% of full scale (calibrated @ 120 VAC). Current: ±3% of full scale. Leakage: ±5% @ 500 µA.
- Model 1653: Volts: ±5% of full scale (calibrated @ 120 VAC). Current: ±5% of full scale.
- INPUT POWER
- Model 1655: 120 VAC ±10%, 60 Hz, 600 VA.
- Model 1653: 120 VAC ±10%, 60 Hz, 300 VA.
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
Never connect two pieces of “hot chassis” equipment to ISOLATED OUTPUT outlets simultaneously due to a serious shock hazard. An electrical shock causing 10 milliamps of current through the heart can stop most human heartbeats and cause death. Voltage as low as 35 volts dc or ac rms should be considered dangerous and hazardous. Remove housings and covers only when necessary and turn off equipment while making test connections in high-voltage circuits. Discharge high-voltage capacitors after removing power. Familiarize yourself with the equipment being tested and the location of its high voltage points. Use an insulated floor material or a large, insulated floor mat to stand on, and an insulated work surface. Use the “one hand in the pocket” technique while handling an instrument probe. Be careful to avoid contacting a nearby metal object that could provide a ground return path. When testing ac powered equipment, remember that line voltage is usually present on some power input circuits even if the equipment is turned off. 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 – 1.5 MB)
Bk-precision-1653-1655-instruction manual: assists technicians in troubleshooting and calibrating models 1653 and 1655. File size: 1.5 MB.
- Brand: Bk-precision-1653-1655-instruction
- Model: MANUAL
- Type: Manual
- File size: 1.5 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-1653-1655-instruction Manual Overview
The Bk-precision-1653-1655 series are versatile digital multimeters designed for precise electrical measurements in both professional and educational environments. These models provide accurate readings of 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
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD for clear readings
- Auto and Manual Ranging modes for flexible measurement
- Data Hold function to freeze displayed values
- Overload protection on all ranges to ensure device safety
- Low battery indicator to alert timely battery replacement
- Compact and ergonomic design for comfortable handheld use
Basic Usage and Operation Tips
Before using the multimeter, ensure the test leads are properly connected to the correct terminals. Select the appropriate measurement mode and range based on the parameter you intend to measure. For unknown values, start with the highest range and adjust downward for accuracy. Always observe polarity when measuring DC voltage or current. Use the Data Hold button to capture readings when needed, and turn off the device after use to conserve battery life.
Troubleshooting and Maintenance
If the multimeter displays erratic readings or no display, check the battery and replace it if necessary. Inspect the test leads for damage or wear and replace if faulty. Clean the device regularly with a dry cloth, avoiding solvents or abrasive materials. If the device fails to power on or shows persistent errors, refer to the detailed troubleshooting section in the manual or contact authorized service centers.
Safety Reminder
Always follow proper safety precautions when using the multimeter. Do not exceed the maximum input limits specified in the manual to avoid damage or personal injury. Avoid measuring live circuits with exposed wiring and wear appropriate protective equipment. Disconnect power before replacing batteries or test leads. Use the multimeter only as intended and keep it out of reach of children.