The service manual for the B&K-PRECISION Model 1466 and 1476 oscilloscopes provides detailed instructions for setup, operation, and troubleshooting, including specifications for vertical and horizontal amplifiers, sweep circuits, and triggering. It emphasizes safety precautions due to the presence of high voltages and is intended for use by qualified electronics technicians to avoid electric shock.
Manual Overview
The service manual for the B&K Precision Models 1466 and 1476 oscilloscopes provides detailed guidance for troubleshooting, diagnostics, calibration, and board-level repairs. The manual emphasizes safety precautions due to the presence of high voltages up to 2000 V, advising technicians to avoid unnecessary exposure to high voltage and to use isolation transformers when working with “hot chassis” equipment. Troubleshooting is facilitated by a comprehensive flowchart that guides technicians through common issues, supported by a list of error codes for diagnostics. Calibration procedures are detailed, ensuring accuracy within specified ranges, with a focus on maintaining a 5% calibration accuracy across all settings. The manual provides specific instructions for adjustments, including deflection factors and frequency responses for both vertical and horizontal amplifiers. Board-level guidance includes specifications for input resistance and capacity, as well as maximum input voltage limits, ensuring technicians can accurately diagnose and repair faults at the component level.
Quick Issues Covered
- Diagnose power-up failures in Model 1466 & 1476 oscilloscopes.
- Identify error codes related to sweep circuit malfunctions.
- Use schematics for circuit tracing and troubleshooting.
Overview
The service manual is for the B & K-PRECISION Model 1466 and 1476 oscilloscopes, which are 10 MHz triggered sweep oscilloscopes. The manual is intended for use by qualified electronics technicians and includes high voltage safety precautions due to the presence of voltages up to 2000 V when the instrument is operating. The manual covers specifications for vertical and horizontal amplifiers, sweep circuits, calibration voltage, intensity modulation, power requirements, and probes for both models.
Specifications
- Deflection Factor 0.01 V/cm to 20 V/cm in 11 calibrated ranges in 1-2-5 sequence. Vernier provided for fine adjustment.
- Calibration Accuracy +5% on all ranges.
- Frequency Response DC: DC to 10 MHz (-3 dB). AC: 2 Hz to 10 MHz (-3 dB).
- Rise time 35 nanoseconds.
- Overshoot 3% or less at 100 kHz square wave display.
- Ringing 3% or less at 100 kHz square wave display.
- Input Resistance 1 megohm, ±5%.
- Input Capacity 22 pF (+3 pF).
- Max. Input Voltage 300 V (DC + AC peak) or 600 V PP.
- Deflection Factor 150mV/cm or less.
- Frequency Response DC to 1 MHz (-3 dB).
- Input Resistance 100 kΩ (nominal).
- Input Capacity 35 pF or less.
- Maximum Input Voltage 300 V (DC + AC peak) or 600 V PP.
- Sweep System Triggered and automatic. In automatic mode, sweep is obtained without input signal.
- Sweep Time 1 µSEC/cm to 0.5 SEC/cm in 18 calibrated ranges, in 1-2-5 sequence. Vernier provided for fine adjustment.
- Sweep Time Accuracy 5%.
- Sweep Magnification Obtained by enlarging the above sweep 5 times from center. Maximum sweep speed becomes 0.2 µSEC/cm.
- Horizontal Linearity 3% or less distortion. (5 nSEC/cm ~ 0.5 SEC/cm) 5% or less distortion – (1 µSEC/cm ~ 2 µSEC/cm)
- Source INT and EXT (1 V p-p sensitivity).
- Slope Positive and negative, continuously variable level control; pull for AUTO.
- Triggering Range INT: 20 Hz to 10 MHz (min. 1 cm deflection as measured on cathode ray tube). EXT: DC ~ 10 MHz
- Video Sync Vertical and horizontal sync separator circuit provided so that any portion of composite video waveform can be synchronized and expanded for viewing. Polarity for VIDEO sync selected by SYNC switch. LINE (horiz.) and FRAME (vert.) sync switched automatically by SWEEP TIME/CM switch. FRAME = 0.5 SEC/cm to 0.1 mSEC/cm (vertical sync pulses). LINE = 50 µSEC/cm to 1 µSEC/cm (horizontal sync pulses).
- Y (vertical) signal supplied to scope INPUT jack; X (horizontal) signal supplied to H INPUT jack.
- 1 V p-p square wave (+5%) at line frequency.
- TTL logic compatible.
- High logic — increases brightness. Low logic — decreases brightness.
- Input Resistance 10 kΩ. (nominal).
- Input 120 or 240 VAC, ±10%, 50/60 Hz, 20 watts. (3-wire line cord, CSA approved for oscilloscopes.) Calibration accuracy applies over full input voltage range.
- Attenuation Combination 10:1 and direct.
- Input Impedances 10:1, 10 megohms, Direct, 1 megohm
- Connector BNC.
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
This service manual is intended for use by qualified electronics technicians only. To avoid electric shock, do not perform servicing unless you are qualified to do so. High voltages up to 2000 V are present when this instrument is operating. Line voltage (120 or 240 VAC) is present on the power input receptacle, line voltage selector, fuse, and power transformer whenever the AC power cord is connected to a live outlet, even if the scope is turned off. Remember, the battery charger circuit continues to operate when the POWER switch is off. Observe all high voltage safety precautions when the housing is removed from the oscilloscope. Contacting exposed high voltage could result in fatal electric shock.
Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must often be performed where exposed voltage is present. An electrical shock causing 10 milliamps of current to pass through the heart will stop most human heartbeats. Higher voltages pose an even greater threat because such voltage can more easily produce a lethal current. However, 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. Your normal work habits should include all accepted practices that will 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. 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.
2. 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. Where an insulated floor surface is not available, wear heavy gloves.
3. 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.
4. Always use an isolation transformer to power transformerless “hot chassis” equipment, where one side of the AC power line is connected directly to the chassis. This includes most recent television sets and audio equipment. Without an isolation transformer, the chassis of such equipment may be floating at line voltage (120 VAC, 60 Hz in USA), depending upon which way the 2-wire AC power plug is inserted. Not only does this present a dangerous shock hazard if the chassis is touched, but damage to test instruments or the equipment under test may result from connecting the ground lead of some test instruments to a “hot” chassis. The ground lead of most oscilloscopes and most other test instruments with 3-wire power plugs is at earth ground. The B & K-PRECISION Model TR-110 Isolation Transformer is suitable for most applications.
5. On test instruments or any equipment with a 3-wire AC power plug, use only a 3-wire outlet. This is a safety feature to keep the housing or other exposed elements at earth ground.
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. Also remember that AC line voltage is present on some power input current points such as on-off switches, fuses, power
Download MANUAL Service manual (PDF – 2.9 MB)
Bk-precision-1476-service manual: 2.9 MB PDF for technicians to troubleshoot and calibrate the Bk-precision-1476 model.
- Brand: Bk-precision-1476-service
- Model: MANUAL
- Type: Service manual
- File size: 2.9 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-1476-service Overview
The Bk-precision-1476 is a versatile digital multimeter designed for precise electrical measurements in both professional and hobbyist environments. This device offers accurate readings of voltage, current, resistance, and continuity, making it an essential tool for troubleshooting electrical circuits, testing components, and performing routine maintenance on electronic equipment.
Main Features and Specifications
- True RMS measurement for accurate AC voltage and current readings
- Wide measurement range: up to 600V AC/DC voltage, 10A current
- Resistance measurement up to 40MΩ
- Continuity buzzer and diode test functions
- Backlit LCD display for easy reading in low-light conditions
- Data hold and relative measurement modes
- Overload protection on all ranges
- Compact, rugged design with a protective rubber holster
Basic Usage and Operation Tips
Before using the Bk-precision-1476, ensure the device is set to the correct measurement mode for your task. Connect the test leads securely to the appropriate input jacks. When measuring voltage or current, always start with the highest range and work downward to avoid damaging the meter. Use the data hold function to freeze readings for easier recording. Remember to turn off the device after use to conserve battery life.
Troubleshooting and Maintenance
If the meter displays erratic readings or fails to power on, check the battery and replace it if necessary. Inspect the test leads for damage or wear, as faulty leads can cause inaccurate measurements. Clean the device regularly with a dry cloth and avoid exposure to moisture or extreme temperatures. For persistent issues, refer to the detailed service manual PDF for component-level troubleshooting and repair instructions.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1476. Do not exceed the specified input limits to prevent electric shock or damage to the meter. Avoid measuring live circuits when the device or test leads appear damaged. Use insulated gloves and tools when working with high voltages, and never operate the meter in explosive or wet environments.