The B&K Precision Model 520B Transistor Tester manual covers the setup and operation of the device, detailing how to perform in-circuit and out-of-circuit testing of transistors, FETs, and SCRs, while providing guidance on identifying device types and measuring leakage currents. It also includes troubleshooting tips, emphasizing safety precautions to prevent electrical shock and damage to both the tester and the equipment under test.
Manual Overview
The B&K Precision Model 520B Transistor Tester manual provides detailed instructions for technicians on using the device for in-circuit and out-of-circuit testing of transistors, FETs, and SCRs. The manual emphasizes safety precautions, highlighting the risks of electrical shock and advising technicians to ensure power is removed from circuits before testing. The tester features a limited-energy pulse circuit for safe in-circuit testing and a user-friendly panel design with minimal controls for efficient operation. The six-position TEST switch allows for comprehensive testing without needing to identify device terminals manually. The device can identify NPN or PNP transistors, silicon or germanium materials, and provides a GOOD/BAD indication. Calibration and service instructions are included, detailing operational tests and adjustments necessary for maintaining accuracy. The manual also covers troubleshooting flow, error codes, and diagnostics, guiding technicians in identifying and resolving issues at the board level. The tester’s design supports rapid testing with audible and visual indicators, ensuring effective diagnostics and maintenance.
Quick Issues Covered
- Diagnose transistor tester power-up failures and operational issues.
- Calibrate and adjust the Model 520B for accurate readings.
- Trace circuits using detailed schematics for troubleshooting.
Overview
The B&K-Precision Model 520B Transistor Tester is designed for both in-circuit and out-of-circuit testing of transistors, with additional features for out-of-circuit tests. It uses a high-current, low duty-cycle pulse technique for testing transistors in the presence of shunting circuitry and a low-current drive system for terminal identification. The instrument is user-friendly with minimal control manipulation, allowing rapid testing. Special features include a patented limited-energy pulse circuit, a human-engineered panel design, a six-position TEST switch, and automatic polarity indication. The tester can identify device types, leads, and measure leakage currents. It is equipped with clip-on test leads for ease of use.
Specifications
- IN-CIRCUIT:
- GOOD/BAD test for transistors, FET’s, or SCR’s.
- Identifies transistor as NPN or PNP and FET as N or P channel.
- Identifies SILICON or GERMANIUM transistors.
- Identifies gate lead of FET or base lead of transistor (HI drive).
- Identifies all leads of transistor when using LO drive.
- Identifies all leads of SCR’s.
- OUT-OF-CIRCUIT:
- GOOD/BAD test for transistors, FET’s or SCR’s.
- Identifies transistor as NPN or PNP and FET as N or P channel.
- Identifies SILICON or GERMANIUM transistors.
- Identifies gate lead of FET by test lead color.
- Identifies all leads of transistor or SCR by test lead color.
- Measures reverse LEAKAGE from 0.1 uA to 5 mA.
- Measures Ipgg and gate leakage of FET’s.
- APPLIED TEST CURRENTS:
- Base Drive: 250 mA (HI drive) or 1 mA (LO drive) at 4% duty cycle.
- Collector Drive: 125 mA at 4% duty cycle.
- Test Repetition Rate: 10 per second.
- Reverse Voltage for leakage test: 2.0V.
- LIMITING IN-CIRCUIT SHUNT VALUES FOR VALID GOOD/BAD TEST:
- Resistance: Down to 10 ohms with HI drive.
- Down to 1.5K ohms with LO drive.
- Capacitance: Up to 15 mfd with HI drive.
- Up to 0.3 mfd with LO drive.
- ACCESSORIES:
- Three test leads with mini-lock clips supplied.
- FP-5 Dynaflex Probe (optional).
- SIZE: 8" x 7" x 32"
- WEIGHT: 5 lbs.
- POWER REQUIREMENTS: 105-125 VAC, 60 Hz, 5 watts.
- 105-125/210-250 VAC, 50/60 Hz version available.
- CSA approved version available.
Controls & Indicators
POWER ON Switch: Applies power to 520B
POWER ON Lamp: Indicates power is ON.
TEST Switch: Selects proper device connection for testing and lead identification.
Lead Identification Window: Identifies leads by color.
DRIVE Switch: Selects LO or HI base drive.
FUNCTION Switch: Spring-return switch selects either of two additional tests:
a. Icgs or Ipgg for transistors; Ipps and gate leakage for FET’s.
b. Identifies device material (silicon or germanium).
LEAKAGE Meter: Indicates device leakage current.
a. Indicates safe leakage limits for typical silicon and germanium transistors.
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
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 voltages 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. Be alert to the following hazards when using the Model 520B Transistor Tester:
1. When performing in-circuit testing of semiconductors, make sure power is removed from the circuit under test. For “hot chassis” equipment, disconnect the power plug in addition to turning off the on-off switch. Most recent television sets, audio equipment, and other equipment with a 2-wire power cord are transformerless “hot chassis’ powered, where one side of the ac power line connects directly to the chassis. If such equipment does not have a polarized power plug to prevent insertion the “wrong” way, a serious shock hazard exists if the chassis is touched. Additionally, damage to the semiconductor tester or the equipment under test could result. Unplug any such equipment from its ac outlet; just turning off the on-off switch does not eliminate the hazard. To be on the safe side, treat all equipment as “hot chassis” unless you are sure it has an isolated chassis or an earth ground chassis.
2. Servicing of the transistor tester should be performed only by qualified electronics technicians who are trained to work safely in the presence of high voltage. Line voltage (120 or 240 VAC) may be present at points in the primary power circuit any time it is connected to an ac outlet, even if the unit is turned off. Always observe caution when the covers are removed from the tester.
Download MANUAL Manual (PDF – 795.6 KB)
Bk-precision-520b-instruction manual: assists technicians in troubleshooting and calibrating the 520b model. File size: 795.6 KB.
- Brand: Bk-precision-520b-instruction
- Model: MANUAL
- Type: Manual
- File size: 795.6 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-520b-instruction MANUAL Overview
The Bk-precision-520b is a versatile digital multimeter designed for accurate electrical measurements in both professional and hobbyist environments. This device provides reliable readings for voltage, current, resistance, and continuity, making it an essential tool for troubleshooting and testing electrical circuits and components.
Main Features and Specifications
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD for easy reading in low light conditions
- Auto and Manual Range Selection for flexible measurement options
- Data Hold Function to freeze readings on the display
- Overload Protection to safeguard the device and user
- Compact and ergonomic design for comfortable handling
- Battery Operated with low battery indicator
Basic Usage and Operation Tips
Before using the Bk-precision-520b, ensure the device is powered on and the correct measurement mode is selected. Connect the test leads to the appropriate input jacks and probe the circuit or component carefully. Use the data hold function to capture readings when needed. Always start with the highest range if unsure of the measurement value to prevent damage. Turn off the device after use to conserve battery life.
Troubleshooting and Maintenance
If the multimeter displays erratic readings or does not power on, check the battery and replace it if necessary. Inspect test leads for damage or wear and replace if faulty. Clean the device regularly with a soft, dry cloth and avoid using harsh chemicals. Store the multimeter in a dry, dust-free environment to maintain optimal performance.
Safety Reminder
Always observe proper safety precautions when working with electrical equipment. Do not exceed the specified input limits of the Bk-precision-520b to avoid electric shock or damage. Use insulated test leads and avoid contact with live circuits. If unsure about any measurement or procedure, consult a qualified technician.