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CHECKING OUT YOUR TRANSISTOR/DIODE TESTER
The following is a simple procedure for testing your DT-100. If the tests fail, refer to the trouble
shooting guide for help.
Diode Operation: 1.) Place the switch in the diode position. Short the black and red leads together
2.) Connect the red and black leads to any good diode. Only one LED should
Transistor Operation:
(using leads) 1.) Place the switch in transistor position. Short the yellow (B) and black (E) leads
(using socket) 2.) Place a known good transistor in the test socket with the Emitter in E, Base in
OPERATING INSTRUCTIONS
The DT-100 is a dynamic transistor and diode tester. It features an in-circuit testing and polarity
indicators for both transistors and diodes.
Diode Testing
1. Place switch in diode position.
2. Connect diode to red and black leads.
3. Push in test switch. One diode LED should blink and identify whether the cathode or anode is
connected to the diode (red) lead.
4. If both LED lamps blink, then the diode is shorted.
5. If neither lights, then the diode is open.
and push in the test button. The diode test LEDs should alternately go on at
about a 1Hz rate.
flash identifying the red lead connection (anode or cathode). Reversing the
leads should cause the other LED to flash.
together. Press the test button. Vary the base current control. The NP lamp
should light with the switch in NPN and the PN when in PNP position.
B and Collector in C pins. Be sure none of the leads are shorting. Vary the
base current control. The OK LED should light. Note that on NPN transistor,
the NP lamp also will glow very slightly. This indicates the base current. The
higher the beta of the transistor, the lower the base current, and thus, lower
intensity. The base current control should be adjusted for the lowest setting with
the OK lamp glowing.
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