Subject to change without notice
13
Five curves (I
C
= f(U
CE
), ID = f(U
G
)) normally are displayed on the screen to
represent the characteristic behavior of a transistor under test. After
selecting the
MIN
or
MAX
setting with the push button called
FUNCTION
(9)
the rotary knob can be used to modify the minimum/maximum base
current/gate voltage in a sense that the five curves fit for the operating
range to be evaluated. Please consider not exceeding the current and
voltage settings beyond the DUTs power dissipation limits.
3. 3. Displaying curves
The Imax and Vmax settings determine the operating range for the test
and define how the curves are going to be displaying on the CRT screen.
As shown in Figure 1, the upper edge of the grid represents the maximum
value of the test current (I
C
, I
D
) according to the selected range (Imax =
200mA/ 20mA/ 2mA).
The right edge of the 8 x 10
screen grid represents the
maximum value of the selec-
ted voltage range
(Vmax = 40V/ 10V/ 2V).
The display is linear along both
axes.
For example, if Vmax is set to
40V and Imax is set to 20mA
the horizontal resolution will be
4V/DIV and a vertical resolution
will be 2.5mA / DIV.
Figure 2
Using the
MIN
or
MAX
function
(9)
and then turning the rotary knob
(8)
allows you to position five characteristic curves on the screen and get the
desired diagnostic results. Care has to be taken not to supersede the safe
operating area of the device. Use the Vmax setup
(22)
to automatically
limit the power applied to the device.
Please ensure that the DUT
function has been activated for
enabling the measurement.
Figure 3