User manual

8-6 Relative and Math 2400 Series SourceMeter
®
User’s Manual
If sourcing voltage, you will be prompted to enter the two V-source values. If
sourcing current, you will be prompted to enter the two I-source values. (See
“Front panel math operations,” page 8-6.)
Percent deviation
This calculation provides the percent deviation between the normal display read-
ing and the user set reference value:
where:X is the normal display measurement reading (V, I, or Ω).
Y is the reference value.
When prompted to enter the reference value (Y), you can enter the value or have
the SourceMeter acquire the reference value. To acquire the reference value, turn
on the output and press AUTO. The SourceMeter will perform a measurement
and display that reading as the reference.
Front panel math operations
Perform the steps below to select and enable a math expression.
1. Select the appropriate source (V or I) for the math expression.
2. Press CONFIG and then FCTN to display the math expression selections.
Place the cursor on the desired math expression and press ENTER:
• For 2-point math expressions, you will be prompted to enter the two
source values. Press ENTER after entering each source value.
• For Percent Deviation, you will be prompted to set the reference value.
The following methods are available:
• User-specified reference value — Enter the desired reference
value and press ENTER.
• Acquire reference value — With the output on, press the AUTO
range key. The SourceMeter will perform a measurement and dis
-
play that reading as the reference. Press ENTER to select that ref-
erence value.
3. Turn on the output by pressing the ON/OFF key.
4. Press the FCTN key to enable the selected math function. The MATH
annunciator will turn on, and the result of the math expression will be dis
-
played.
Note that with FCTN enabled, the sweep for a 2-point math expression runs con-
tinuously. Each sweep updates the reading. The source value cannot be changed
while the 2-point sweep is running. However, the range keys remain active.
%Deviation
XY–()
Y
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100×=