The manual for the B+K Precision Models 1744A and 1745A DC Power Supplies provides detailed instructions on setup, operation, and troubleshooting, including safety precautions, controls, and indicators, as well as guidance on constant voltage and current applications. It also covers maintenance procedures such as fuse replacement and line voltage conversion, and includes specifications for output voltage and current, metering, and protection features.
Manual Overview
The B+K Precision Models 1744A and 1745A DC Power Supplies are designed for precise voltage and current outputs, featuring dual displays for continuous monitoring. These units can operate in either constant voltage or constant current modes, with smooth automatic crossover between the two. Troubleshooting involves checking the LED indicators for mode confirmation and ensuring proper connection to prevent reverse polarity damage. Error diagnostics focus on maintaining correct voltage and current limits, with overload protection to safeguard both the power supply and connected equipment. Calibration and adjustments are facilitated by coarse and fine controls for both voltage and current, ensuring accurate settings. At the board level, the pre-regulator design minimizes internal power dissipation, enhancing reliability. The output is isolated from the chassis and earth ground, allowing flexible connection configurations, including series or parallel setups for increased voltage or current capacity. Safety precautions emphasize the importance of grounding and avoiding high voltage exposure during testing. Regular maintenance includes fuse replacement and line voltage conversion, with a clear emphasis on safety and operational integrity.
Quick Issues Covered
- Diagnose power-up failures with LED mode indicators.
- Adjust voltage/current settings using coarse and fine controls.
- Use schematics for circuit tracing and fault isolation.
Overview
The B+K Precision Models 1744A and 1745A are high-quality, general-purpose DC power supplies providing 0-35 volts DC output and 0-10 amps current, with adjustable coarse and fine controls for both voltage and current. These models feature excellent regulation, low ripple characteristics, and a pre-regulator to reduce internal power dissipation. They can operate in constant voltage or constant current modes with smooth and automatic crossover, indicated by LED displays. The power supplies are equipped with reverse polarity protection and current limiting to prevent damage. They are suitable for various applications, including electronics servicing, manufacturing, design labs, education, battery charging, and more. The manual covers safety precautions, specifications, controls and indicators, operating instructions, maintenance, and warranty service instructions.
Specifications
- OUTPUT VOLTAGE: 0 to 35 VDC, coarse and fine adjustment.
- OUTPUT CURRENT: 0 to 10 A, coarse and fine adjustment.
- CONSTANT VOLTAGE OPERATION
- Voltage Regulation
- Line (108-132 V): <0.2% +2 mV
- Load (no load to full load): <0.04% + <0.04% +2 mV
- Recovery Time: <100 us typical.
- Ripple Voltage
- RMS: <1 mV.
- Temperature Coefficient
- (0° to +40 °C): <300 PPM/°C
- CONSTANT CURRENT OPERATION
- Adjustable Current Limits: 5% to 100%
- Current Regulation
- Line (108-132 V): <0.4% +5 mA
- Load: <0.4% +5 mA
- Current Ripple: <3 mA typical.
- METERING
- Model 1745A
- Voltmeter 4 digit Green LED Display
- Range: 0 to 99.99 V.
- Accuracy: (0.5% + 9 digits)
- Ammeter 4 digit Red LED Display
- Hi Range: 0 to 9.999 A.
- Accuracy: (0.5% + 9 digits).
- Model 1744A
- Voltmeter Range: 0 to 40 V
- Accuracy: +2.5%
- Ammeter Hi Range: 0 to 10 A
- Lo Range: 0 to 2.2 A.
- Accuracy: +2.5%
- POWER REQUIREMENTS:
- Domestic: 120 VAC +10%, 60 Hz
- International: 120/220/230/240 VAC – 10%, 50/60 Hz
- POWER CONSUMPTION: Approximately 420 W or less at full load.
- PROTECTION: Reverse polarity protection, Current limiting.
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
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Safety & Warnings
Normal use of test equipment exposes you to a certain amount of danger from electrical shock, especially when testing where exposed high voltage is present. 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 to steer current away from your heart in case of accidental contact with a high voltage.
Observe the following safety precautions:
1. There is little danger of electrical shock from the dc output of this power supply. However, several other possible test conditions using this power supply can create a high voltage shock hazard:
a. If the equipment under test is the “hot chassis” type, a serious shock hazard exists unless the equipment is unplugged (just turning off the equipment does not remove the hazard), or an isolation transformer is used.
b. If the equipment under test is “powered up” (and that equipment uses high voltage in any of its circuits), the power supply outputs may be floated to the potential at the point of connection. High voltage may appear at unexpected points in defective equipment. Do not float the power supply output to more than 100 volts peak with respect to chassis or earth ground.
c. If the equipment under test is “off” (and that equipment uses high voltage in any of its circuits under normal operation), discharge high-voltage capacitors before making connections or tests. Some circuits retain high voltage long after the equipment is turned off.
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. 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.
Download MANUAL Manual (PDF – 1004.2 KB)
Bk-precision-1745a-instruction manual: assists technicians in troubleshooting and calibrating the 1745A power supply. File size: 1004.2 KB.
- Brand: Bk-precision-1745a-instruction
- Model: MANUAL
- Type: Manual
- File size: 1004.2 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-1745a-instruction MANUAL Overview
The Bk-precision-1745a is a versatile digital multimeter designed for accurate electrical measurements in both professional and hobbyist environments. This device provides reliable readings of voltage, current, resistance, and continuity, making it an essential tool for troubleshooting and testing electronic circuits and electrical systems.
Main Features and Specifications
- True RMS measurement for accurate AC readings
- Wide measurement range: up to 600V AC/DC voltage, 10A current
- Resistance measurement up to 40MΩ
- Continuity buzzer for quick circuit testing
- Data hold function for easy reading retention
- Backlit LCD display for visibility in low-light conditions
- Auto power-off to conserve battery life
- Robust casing with overload protection
Basic Usage and Operation Tips
Before using the Bk-precision-1745a, ensure the test leads are properly connected to the correct input terminals. Select the desired measurement function using the rotary switch. When measuring voltage or current, always start with the highest range to prevent damage to the meter. Use the data hold feature to freeze readings for easier documentation. For resistance and continuity tests, ensure the circuit power is off to avoid inaccurate measurements or damage.
Troubleshooting and Maintenance
If the device displays erratic readings or fails to power on, check the battery and replace it if necessary. Regularly inspect test leads for damage or wear and replace them to maintain accurate measurements. Clean the meter’s exterior with a soft, dry cloth and avoid exposure to moisture or extreme temperatures. If the device experiences overload, the protection circuitry will activate; disconnect the test leads and reset the meter before continuing.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1745a. Do not exceed the specified input limits to avoid electric shock or damage. Use the meter only on de-energized circuits when measuring resistance or continuity. Wear appropriate personal protective equipment and follow local electrical safety regulations to ensure safe operation.