B+K Precision, represented in Australia by Unispan Instruments , has released the 520C transistor tester. The low-cost, battery-powered tester can be used for in-circuit and out-of-circuit transistor testing, with special features for making additional tests on devices out of circuit.
It is designed for a minimum amount of control manipulation, making for rapid testing of most devices. It is suitable for use in determining good or bad transistors, FETs, SCRs or diodes.
A 9V dc alkaline battery (supplied) provides power. When the power switch is first turned on, the front-panel-mounted LEDs will cycle on then off, allowing a visual check of LED functions. The 520C uses a limited-energy pulse circuit that permits in-circuit testing in the presence of a high current, low duty-cycle pulse technique to test transistors in the presence of shunting circuitry. It also has a low-current drive system which enables the user to identify the terminals of the device in most in-circuit tests and all out-of-circuit checks.
The easy-to-use front panel eliminates the need to refer to the operating manual. There are only three switches and no panel adjustments. The six-position test switch sequentially connects the device under test in all possible configurations, making it unnecessary to know the device's terminal identification. The switch can be left in the correct position so that additional tests can be conducted without memorising test position.
The base or gate lead can be identified by colour as the test switch is operated when testing with HI drive. All the leads of the transistor are identified when testing with LO drive. The 520C will determine whether the device is a transistor, FET or SCR and identifies the lead configuration. The unit will measure the ICES or IBES of transistors, IDSS and gate leakage of FETs, and the reverse leakage current of diodes.
The system has a meter that identifies leakage in both silicon and germanium devices, an audible momentary tone that tells when the device under test is good, and an automatic polarity indication identifies NPN or PNP, N or P channel-type devices. Supplied clip-on test leads that make positive connections with devices in difficult locations can also be used to free up an operator's hands to make further tests.
The tester measures 50.8mm x101.6mm x 190.5mm and weighs 454g. It is supplied with an operator manual, a 9V dc battery and three test leads with mini-lock clips.