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BK Precision Transistor Tester Model 520 B in Working Condition

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$50.00
$50.00
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BK Precision Transistor Tester Model 520 B in Working Condition - selling some of my test gear. I have several similar models or overlapping test functions and we are downsizing in preparation for retirement.


Condition: One of the best unit I have come across for over all working and physical condition, which is why I kept it for so long. This is fully operational as far as I know, it has not let us down. I have a copy of the manual we would be happy to pace on a USB stick if you bring one.


Operation:

  • Determines good or bad transistors/diodes in or out-of-circuit and reverse leakage current of diodes. 
  • Identifies E-B-C leads of transistors. 
  • Indicates polarity of good devices (NPN or PNP). 
  • Indicates whether silicon or germanium/bipolar/FET/SCR 
  • Measures ICES/IBES of transistors. 
  • Measures IDSS of FET’s as well as gate leakage  


Highlights:

  • Limited-energy pulse circuit permits highly successful use of in-circuit testing in the presence of low shunt impedances with complete safety for the device under test.
  • Front panel is fairly easy to use, only two main switches and no adjustment. The six-position TEST switch sequentially connects the device being tested in all possible configurations making it unnecessary to know the device terminal identification. Can be left in GOOD position so that additional tests can be made without memorizing test position. Automatic polarity indication to identify NPN or PNP type devices.
  • Choice of test leads for in circuit or front panel socket for out-of-circuit tests.
  • Base or gate lead indicated by color as test switch is operated.
  • Audible tone tells when device under test is good - no need to take eyes off circuit board while testing hard-to-get-at devices.
  • A logarithmic leakage meter which displays a wide leakage current range on a single meter scale.
  • Identification of SILICON and GERMANIUM device types for proper evaluation of leakage current with color-keyed LED indicators for positive test interpretation.
  • 9. Locking test leads that make positive connections to devices in difficult locations. Frees operator’s hands to make further tests.


Operation:


IN-CIRCUIT: 

  • GOOD/BAD Test for PNP, NPN transistors, FET, SCR. 
  • Identifies NPN or PNP transistors. 
  • Identifies SILICON or GERMANIUM transistors. 


OUT-OF-CIRCUIT: 

  • GOOD/BAD Test for PNP, NPN transistors, FET, SCR. 
  • Identifies NPN or PNP transistors. 
  • Identifies SILICON or GERMANIUM transistors. 
  • Measures Reverse LEAKAGE from 0.1 mA to 5mA. 
  • Measures loss and gate leakage of FET’s. 


APPLIED TEST CURRENTS: 

  • Collector Current: 250mA at 5% duty cycle. 
  • Base Current: 125mA at 5% duty cycle. 
  • Test Repetition Rate: 10 per second. 
  • Reverse Voltage for Leakage Test: 3.5V. 


LIMITING IN-CIRCUIT SHUNT VALUES FOR GOOD-BAD TEST: 

  • Resistance: Greater than 10 ohms. 
  • Capacitance: Up to 5mfd with low beta devices, up to 15mfd with higher betas


ACCESSORIES: 

  • Three test leads with mini-lock clips supplied


SIZE: 8" x 7" x 3W  - WEIGHT: 3.5 lbs. 










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