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Figure 4
transistor is connected and mistakenly PNP
HM6042 cuts off the outputs after a short verification. The
display
shows „Output OFF".
Measuring device parameters
Generally, the behavior of transistors is determined by their
static and dynamic parameters. To display the different
parameter values on the display press one of the two push
buttons
which are located below the LCD.
The screen cursor (highlighted dot) indicates exactly the point
on the curve where the actual measurement is done.
The following parameters can be measured and displayed by
the instrument:
a) Static Parameters
V
/ V
Base / Gate Voltage
B
G
I
/ I
Base / Gate Current
B
G
I
/ I
Collector / Drain Current
C
D
V
/ V
Collector / Drain Voltage
C
D
β
Current Gain
b) Dynamic Parameters
h11
Short - circuit input impedance
h21
Short - circuit forward-current transfer ratio
h22
Open - circuit output conductance
y21
Short - circuit forward admittance
y22
Short - circuit output admittance
Using the cursor functions
The cursor (highlighted dot) indicates the point on a
characteristic curve where the actual value is going to be
digitized by the instrument. After the HM6042 has been
powered on, the cursor will appear on the third of the five
characteristic curves.
The cursor can be repositioned by using the CURSOR key
or the rotary knob
. With the CURSOR key
be moved from one curve to the next. To move the cursor
horizontally along a curve select
bar and turn the rotary knob
desired direction.
The numerical value for the selected static parameter will be
displayed on the LCD
in accordance to the actual cursor
position.
16
is selected,
the cursor can
on the LED function
to reposition the cursor in the
U s i n g o f t h e H M 6 0 4 2
When choosing the option to display one of the dynamic
parameters h11, h21 or y21, a second cursor appears on the
curve below. Turning the rotary knob
moved horizontally along their respective curves. The HM6042
digitizes the values as required at the highlighted positions
and displays the calculated result on the LCD
If you test one of the dynamic parameters h22 or y22, the
second cursor appears on the same curve beside the original
cursor. Turning the rotary knob
activated will change the position of the second cursor. After
selecting function TRK
and turning the rotary knob
both cursors will be moved along the curve. The HM6042
digitizes the values at the highlighted positions and displays
the calculated result for h22 or y22 on the LCD
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.
Memory function, component matching
To support the easy selection of transistors (component
matching), the HM6042 provides a very helpful memory
function. The selection of components with respect to the
displayed parameter (i.e. I
C
rather easy and time saving task.
The reference component should be mounted on the left so-
cket of the adapter and the desired parameter has to be
selected by the push buttons
MORY push button
the instrument stores the measured
parameter internally and allows comparing the parameters
of a second transistor with the value stored in memory. The
sign „Delta" will be shown in the display
now relative values are shown. The display is set to 0. The
second device under test should be mounted on the second
test socket of the adapter and the switch of the adapter has to
be shifted to the right. Now the display
value referring to the reference value. The specification is not
in % but the absolute difference. 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. To
quit the memory function or to use another transistor as
reference component press the memory button
Error messages
If one of the following error messages is displayed, the
instrument has to be sent in for calibration. Please consider
our repair and warranty terms (see page 19 within this manual).
– CALIBRATION FAULT
– VERIFICATION ERROR
– TIMING ERROR
now both cursors are
.
while function
, now
as requested.
, β, h11, h22, y21 or y22) is a
/I
D
. When pressing the ME-
to indicate that
shows the difference
repeatedly.
Subject to change without notice
is
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