Capter 3
Function Setting and Basic Operation
3-56
Curve Tracer CS-3000 Series Instruction Manual
3.10.4.3
FREE cursor
Pressing F4 key on CURSOR menu allows the
straight-line FREE cursor to appear. The FREE
cursor can specify the arbitrary coordinates on
the screen. The vertical axis coordinates (VERT)
and the horizontal axis coordinates (HORIZ) are
displayed in the area under the menu (in the
frame of right example).
Each press of F4 key or FUNCTION knob toggles
cursor display in the order below:
- Only one straight-line cursor in the vertical axis direction
- Only one straight-line cursor in the horizontal axis direction
- One straight-line cursor in each of the vertical and horizontal
axis directions
Measurement value display on the curve for specified voltage and current
DOT cursor shown in Section 3.10.4.1 moves
on DOTs of the measurement value on the
characteristics curve. Since DOT cursor shows
the raw measurement result, the result which is
completely consistent with the specified
voltage (or current) cannot be obtained. In such
a case, if FREE cursor is used, the result can be
obtained using calculation. For FREE cursor, the
current (or voltage) at that time is calculated by
linear-interpolating between two points striding
over the specified voltage (or current) value on
the characteristics curve.
The diagram on the upper-right is the example
of DOT cursor measurement. In the diagram,
since HORIZ voltage value at DOT position in
the horizontal direction is
+
1.9781V, VERT
current value cannot be obtained at the exact
position of HORIZ voltage value: 2.00V.
Therefore, FREE cursor is used to display the
cursor in the vertical axis direction (diagram on
lower-right). When setting HORIZ voltage value
to 2.00V, 1.3894mA which is VERT current
value at that time is displayed in the area under
the menu.
This example shows that HORIZ voltage value
is set and inversely, VERT current value can be
set to a specified current. For FREE cursor,
HORIZ voltage value at that time can be read by setting VERT current value to a specified current
with use of the cursor in the horizontal direction.
Note that values to be calculated are only those on the specified STEP characteristics curve. The
value specified by DOT cursor is used for the STEP specified value. Therefore, when changing
STEP, it is necessary to change to DOT cursor once. In addition, there are multiple intersection
points between the characteristics curve and the specified voltage (current), calculation uses the
intersection point with lower index value.
Cursor in vertical axis direction
Cursor in horizontal axis direction
Summary of Contents for CS-3000 Series
Page 1: ...Instruction Manual Curve Tracer CS 3000 series CS 3100 CS 3200 CS 3300 ...
Page 2: ...Ⓒ 2010 IWATSU ELECTRIC CO LTD All rights reserved ...
Page 16: ......
Page 170: ......