The manual for the B+K Precision Models 2120B and 2125A 30 MHz Dual-Trace Oscilloscopes covers setup, operation, and troubleshooting, including detailed instructions on safety precautions, operating tips, and maintenance procedures. It provides information on the oscilloscope's features, such as dual trace capabilities, calibrated voltage and time measurements, and sweep functions, as well as guidance on fuse replacement, line voltage selection, and periodic adjustments.
Manual Overview
The BK Precision Models 2120B and 2125A oscilloscopes are 30 MHz dual-trace instruments designed for accurate signal observation and measurement. The manual emphasizes safety precautions due to the potential for electrical shock, especially when working with high voltage. It advises using isolation transformers for “hot chassis” equipment and practicing safe handling techniques, such as the “one hand in the pocket” method. Troubleshooting guidance includes understanding the oscilloscope’s controls and indicators, such as vertical and horizontal controls, triggering, and sweep operations. Calibration and adjustments are crucial for maintaining accuracy, with periodic checks recommended for voltage and time measurements. The manual provides detailed instructions for using the dual trace and dual time base features, including sum and difference capability for waveform analysis. Error diagnostics are supported by clear guidelines on fuse replacement and line voltage selection. Board-level guidance is not explicitly detailed, but the manual offers general maintenance advice and service information to ensure reliable operation.
Quick Issues Covered
- Diagnose power-up failures with initial starting procedure guidance.
- Calibrate vertical gain for accurate voltage measurements.
- Use schematics for circuit tracing and troubleshooting.
Overview
The product is a 30 MHz dual-trace oscilloscope, specifically the B+K Precision Models 2120B and 2125A. These oscilloscopes are designed for high performance at an economical price, offering a 30 MHz bandwidth compared to the typical 20 MHz of competitor models. The manual covers various aspects, including test instrument safety, features, specifications, controls and indicators, operating instructions, maintenance, and additional appendices. Key features include high sensitivity, calibrated voltage and time measurements, dual trace capabilities, and dual time base features for the Model 2125A.
Specifications
- 30 MHz dual-trace oscilloscopes
- Models 2120B and 2125A
- Rectangular CRT with large 8 x 10 centimeter viewing area
- Variable scale illumination on Model 2125A
- 3 mV/div sensitivity for full bandwidth
- High-sensitivity 1 mV/div and 2 mV/div using PULL XS gain control
- Accurate voltage measurements (±3%) on 10 calibrated ranges from 5 mV/div to 5 V/div
- Vertical gain fully adjustable between calibrated ranges
- Accurate (+3%) time measurements
- Main sweep with 23 calibrated ranges from 2 S/div to 0.1 μS/div
- Delayed sweep on Model 2125A with 23 calibrated ranges from 2 S/div to 0.1 μS/div
- Sweep time fully adjustable between calibrated ranges
- X10 Sweep Magnification
- Models 2120B and 2125A each have two vertical input channels
- Selectable single trace (either CH 1 or CH 2) or dual trace
- Alternate or chop sweep selectable at all sweep rates
- Permits algebraic addition or subtraction of channel 1 and channel 2 waveforms
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
Normal use of test equipment exposes users to electrical shock hazards, especially when testing in areas with exposed high voltage. A shock causing 10 milliamps of current through the heart can be fatal, and voltages as low as 35 volts can be dangerous. Safety precautions include:
– Avoid unnecessary exposure to high voltage in equipment under test. Remove housings and covers only when necessary.
– Turn off equipment when making test connections in high-voltage circuits and discharge high-voltage capacitors after removing power.
– Familiarize yourself with the equipment and its high voltage points, but be aware that high voltage may appear unexpectedly in defective equipment.
– Use insulated floor material or a large, insulated floor mat and an insulated work surface; ensure these surfaces are not damp or wet.
– Use the “one hand in the pocket” technique when handling an instrument probe to avoid creating a ground return path.
– Touch only the insulated portion of a probe, never the exposed tip.
– Remember that ac line voltage is present on some power input circuits whenever equipment is connected to an ac outlet, even if turned off.
– Be cautious with equipment having a two-wire ac power cord, as it may be “hot chassis” type, posing a shock hazard if the chassis is touched. Use an isolation transformer for measurements in such equipment.
– Never work alone; someone should be nearby to provide aid if necessary. CPR training is recommended.
Download MANUAL Manual (PDF – 1.7 MB)
Bk-precision-2120b-instruction manual aids technicians in troubleshooting and calibrating the 2120B model. File size: 1.7 MB.
- Brand: Bk-precision-2120b-instruction
- Model: MANUAL
- Type: Manual
- File size: 1.7 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
Bk-precision-2120b-instruction MANUAL Overview
The Bk-precision-2120b is a versatile DC power supply designed for laboratory, educational, and industrial applications. It provides a stable and adjustable output voltage and current, making it ideal for testing, prototyping, and powering electronic circuits with precision and reliability.
Main Features & Specifications
- Output Voltage Range: 0 – 20 V DC
- Output Current Range: 0 – 3 A
- Dual digital displays for voltage and current readings
- Constant voltage and constant current operation modes
- Overload and short circuit protection
- Fine and coarse adjustment knobs for precise control
- Compact and durable design suitable for bench use
Basic Usage & Operation Tips
Before powering on the device, ensure all connections are secure and the output terminals are not shorted. Use the coarse adjustment knob to set the approximate voltage or current, then fine-tune with the fine adjustment knob for accuracy. Always start with the output voltage and current set to zero, then gradually increase to the desired level. Monitor the digital displays closely during operation to prevent overloading the connected equipment.
Troubleshooting & Maintenance
If the output voltage or current readings are unstable, check all cable connections and ensure the load is within the specified limits. In case of unexpected shutdowns or protection mode activation, allow the unit to cool down before restarting. Regularly clean the exterior with a dry cloth and avoid exposure to moisture or dust. For internal maintenance or repair, consult the authorized service center to avoid voiding the warranty.
Safety Reminder
Always operate the Bk-precision-2120b in a well-ventilated area and avoid contact with live terminals during use. Disconnect the power supply before making any wiring changes. Follow all local electrical safety regulations to prevent electric shock or damage to the device and connected equipment.