Subject to change without notice
15
the rotary knob
(8)
while function is activated
(9, 7)
will change the
position of the second cursor.
After selecting function
TRK (9, 7)
and turning the rotary knob, now both
cursors will be moved along the curve in their tracking mode. The
HM6042
digitizes the values at the highlighted positions and displays the calculated
result for h22 or y22 on the LCD as requested.
The second cursor is only visible in the measuring mode for the dynamic
parameters and will be switched on and off by the instrument automatically.
3. 6. Memory function, component matching
To support the easy selection of transistors (component matching), the
HM6042
provides a very helpful memory function. When pressing the
MEMORY
push button
(5)
the instrument stores the measured parameter
internally and allows comparing the parameters of a second transistor with
the value stored in memory. The second device under test should be
mounted on the second test socket of the adapter. So, the selection of
devices related to a reference component can be simply achieved by
switching between the left and right socket of the adapter.
Thus the selection of components with respect to the displayed parameter
(i.e. I
C
/I
D
,
β
, h11, h22, y21, or y22) is a rather easy and time saving task.
To quit the memory function or to use another transistor as reference
component press the memory button
(5)
repeatedly.
4. Application examples
4. 1. Characteristic curves of a bipolar transistor
1. Connect the device to be tested to the appropriate input.
2. Ensure the BIP/FET switch
(15)
is set to the BIP position.
3. Select NPN or PNP as appropriate with the NPN/PNP switch
(16)
.
4. Select the appropriate range for the maximum current
(Imax) (19)
,
maximum voltage
(Vmax) (21)
, and maximum power
Pmax (23)
.
5. Press the DUT switch
(14)
. Five curves (see Figure 1 or 2) now will be
visible on the screen.
Components under test can have higher temperatures. Please be careful
when handling components having been connected to the test
instrument.
6. The vertical position of the curves I
C
= f(U
CE
) is determined by the base
current IB as parameter and can be adjusted stepwise by turning the
rotary knob
(8)
while
FUNCTION (9, 7)
is set to
MAX
or
MIN
. With
MAX
selected base current for the top curve will be set, with
MIN
selected that for the bottom curve. The three curves between these
two are going to be displayed in equal distances.
After the
HM6042
is powered on, the base current is set to its minimum
value.