The service manual for the B&K Precision Models 1403A and 1405 oscilloscopes provides detailed information on setup, operation, and troubleshooting, including specifications, control descriptions, circuit adjustments, and maintenance procedures. It emphasizes safety precautions due to the presence of high voltage and includes a history of production changes that may affect servicing and repair.
Manual Overview
The service manual for the B&K Precision Models 1403A and 1405 oscilloscopes provides detailed guidance for technicians on troubleshooting, diagnostics, and maintenance. It emphasizes safety precautions due to the presence of high voltage, which can reach up to 1,400 volts DC. The manual includes a comprehensive troubleshooting section that outlines a methodical approach to diagnosing issues, supported by error codes and diagnostic procedures. Calibration and adjustments are covered, detailing the necessary steps to ensure accurate waveform observation, with specific focus on the vertical and horizontal channels. The vertical channel offers a bandwidth of DC to 5 MHz and a sensitivity of 10 mV/division, while the horizontal channel supports a sweep range from 10 Hz to 100 kHz. Board-level guidance is provided through circuit descriptions, a circuit board map, and schematic diagrams, aiding in the repair and servicing of the instruments. Differences between the models, primarily cosmetic, are noted, with the Model 1405 serving as a replacement for the Model 1403A since 1979.
Quick Issues Covered
- Diagnose power-up failures in Model 1405 oscilloscopes.
- Troubleshoot error codes specific to Model 1403A.
- Use schematics for circuit tracing in Model 1405.
Overview
The B & K Precision Models 1403A and 1405 are compact, single trace, general-purpose oscilloscopes designed for observing waveforms. They feature a 3-inch round CRT with a 12 x 12 division graticule, allowing waveforms to be viewed on about 8 x 10 divisions. The vertical channel has a bandwidth of DC to 5 MHz and a sensitivity of 10 mV/division. The horizontal channel uses a recurrent type sweep with four ranges and a variable control to span the 10 Hz to 100 kHz band. The manual covers these models from the start of production, detailing equipment differences, production changes, and safety precautions for handling high voltage.
Specifications
- 5 MHz oscilloscope
- Model 1405
- Sweep range: 10 Hz to 100 kHz
- Trigger sensitivity: 1 division (internal sync), 2 volts peak-to-peak (external sync)
- Vertical channel bandwidth: DC to 5 MHz
- Vertical channel sensitivity: 10 mV/division
- Input impedance: 1 Megohm
- Three-step attenuator: 1:1, 10:1, 100:1
- Horizontal channel: Variable gain X-axis amplifier, maximum sensitivity of 300 mV per division
- X-Y operation bandwidth: Up to 250 kHz
- Z-axis input for intensity modulation
Controls & Indicators
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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 and servicing can expose individuals to electrical shock, especially when high voltage is present. An electrical shock with 10 milliamps of current can stop most human heartbeats, and voltage as low as 35 volts can be dangerous. High voltage up to 1,400 volts is present when servicing the oscilloscope, and precautions should be taken when the unit is operating with the case removed. High voltage charges can be retained indefinitely, especially at the CRT socket and anode cap, so high voltage capacitors should be discharged with a grounded test lead after removing power. High voltage should not be exposed needlessly, and equipment should be turned off while making test connections in high-voltage circuits. It is important to familiarize oneself with the equipment and the location of high voltage points, but high voltage may appear at unexpected points in defective equipment. Insulated floor material or a large, insulated floor mat should be used to stand on, and an insulated work surface should be used to place equipment, ensuring surfaces are not damp or wet. The “one hand in the pocket” technique should be used while handling an instrument probe to avoid contacting a nearby metal object that could provide a ground return path. The ground wire of the 3-wire ac power plug places the chassis and housing of the oscilloscope at earth ground, and it should not be defeated or floated. When using a probe, only the insulated portion should be touched, and the exposed tip portion should never be touched. When testing ac powered equipment, ac line voltage is usually present on some power input circuits even if the equipment is turned off. The service manual is intended for use by qualified electronics technicians only, and servicing should not be performed unless qualified to do so.
Download MANUAL Service manual (PDF – 2.7 MB)
Bk-precision-1405-service manual PDF aids technicians in troubleshooting and calibrating the BK Precision 1405 model. File size: 2.7 MB.
- Brand: Bk-precision-1405-service
- Model: MANUAL
- Type: Service manual
- File size: 2.7 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
Download MANUAL service manual (PDF)
Bk-precision-1405-service Overview
The Bk-precision-1405 is a versatile digital multimeter designed for accurate measurement of electrical parameters in various applications. Ideal for both professional technicians and hobbyists, this device offers reliable performance for testing voltage, current, resistance, and continuity in circuits, ensuring precise diagnostics and troubleshooting.
Main Features and Specifications
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD with clear digit readout
- Auto and Manual Ranging for flexible operation
- Data Hold and Relative Measurement modes
- Overload Protection on all ranges
- Battery Powered with low battery indicator
- Compact and ergonomic design for easy handling
Basic Usage and Operation Tips
Before using the Bk-precision-1405, ensure the device is powered on and the test leads are properly connected. Select the appropriate measurement mode and range for your application. Always start with the highest range if uncertain about the expected values to prevent damage. Use the data hold function to freeze readings for easier observation. When measuring current, connect the meter in series with the circuit. For voltage and resistance, connect the leads in parallel or across the component under test.
Troubleshooting and Maintenance
If the device displays erratic readings or fails to power on, check the battery and replace it if necessary. Inspect the test leads for any visible damage or wear and replace them if faulty. Clean the device regularly with a soft, dry cloth and avoid exposure to moisture or extreme temperatures. If the meter does not respond or shows persistent errors, consult the service manual for detailed diagnostic procedures or contact authorized service centers.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1405. Do not exceed the maximum input limits specified in the manual. Avoid contact with live circuits and use insulated test leads to prevent electric shock. Disconnect power to the circuit before measuring resistance or continuity. Wear appropriate personal protective equipment and work in a safe environment to minimize risks.