Micronta 22-025 - How It Works; Battery Installation;Replacement

3) Connect Test Leads (Cat. No. 278-705) to the OUTPUT
Terminals and place the leads across any part under test. If
the part under test is conductive, the LED goes out. Using
this technique you can check if the lead or part has
continuity.
HOW IT WORKS
This Transistor Checker uses a specially designed pulse generat-
or which steps up an AC signal (generated by the transistor
under test) to a value sufficient to light the LED.
The brightness of the LED varies according to the magnitude of
the output signal — the more output signal, the brighter the
LED.
The BASE CURRENT CONTROL knob can be rotated to de-
crease base current from 0 (MAX.) to 100 (MIN.) so you can set
collector current. The reading where oscillation stops (LED stops
blinking) indicates the transistor gain. The greater the number,
the higher the gain.
MATCHING TRANSISTOR
CHARACTERISTICS
If the characteristics of one transistor correspond to another, the
BASE CURRENT CONTROL setting where the oscillation stops
should be equal for both transistors. These results are for
comparison only and the CONTROL settings do not actually
respresent Beta values (or any other unit).
BATTERY INSTALLATION/REPLACEMENT
1. Remove screws from the bottom of the Tester.
2. Slip the battery ribbon over an “АА” penlight cell (Cat. Мо.
23-582 or 23-552).