Sencore TF151 - Regular Transistor Troubleshooting Chart

RED LEAD
C
BLACK LEAD
E
YELLOW LEAD
B
Figure 4. Connecting To A Transistor Wired On Printed Circuit &>ard
2. Set the function switch to LO POWER X10 (HI POWER X10 for High power
transistors or SPECIAL RF Xl for low saturation transistors) and the TYPE
switch to the desired type, NPN or PNP.
3. Rotate the BETA CAL control until the meter reads on the BETA CAL line
on the meter. Push the GAIN button and read the actual AC beta of the
transistor OIa the meter scale marked BETA. The reading will be multiplied
by 10 for the actual beta figure, if the Function Switch is in the X10 position.
If the meter reads to the right of the BETA CAL line, or less than 10 when using the
LO POWER X10 or HIPOWER X10, switch the Function switch to the Xl range, re-
calibrate the BETA CAL control, and push the GAIN button to read the beta. For
the Xl ranges, the meter scale is read directly. The chart below gives the tran-
sistor problems that can occur and how they will look on the TF15l.
TROUBLE
Open
Base, Emitter or
Collector
REGULAR TRANSISTOR CHART
AS APPEARS ON TF15l
Cannot BETA CAL when transistor is tested out of
circuit. In circuit TF15l may BETA CAL through
circuit impedances but no beta reading can be ob-
tained when GAIN button is depressed.
10