Keithley 2790, Reference Manual

Page: 177 / 568

5-10 Model 2790 SourceMeter
®
Switch System Reference Manual
For remote programming, the value +9.9e+37 is returned for an “OVRFLW” reading. The
value -9.9e+37 is returned for an “UDRFLW” reading.
m/X + b configuration
1. Press SHIFT and then MATH to display the math menu.
2. Press the RANGE or key to display “mX + B” and press ENTER to display
the present scale factor:
M: +1.000000
^
(factory default)
3. Key in the scale factor value. The and keys control cursor position and
the and keys increment/decrement the digit value. To change range, place the
cursor on the multiplier and use the and keys (m =
×
0.001,
^
=
×
1,
K =
×
1000, and M =
×
1,000,000). With the cursor on the polarity sign,
the and keys toggle polarity.
4. Press ENTER to enter the m value and display the offset (b) value:
b: +00.00000 m (factory default)
5. Key in the offset value.
6. Press ENTER to enter the b value and display the one-character units designator:
UNITS: X (factory default)
7. Use the cursor keys and the or key if you wish to change the units designator.
The character can be any letter in the alphabet (A through Z), the degree symbol (°),
or the ohms symbol (
Ω
).
8. Press ENTER. The MATH annunciator will turn on and the result of the calculation
will be displayed. Note that the calculation will be applied to all measurement
functions.
9. To disable m/X + b, again press SHIFT and then MATH. The MATH annunciator
will turn off.
klqb
The result of the m/X+b calculation may be displayed in exponential notation.
For example, a displayed reading of +2.500E+03 R is equivalent to 2500 R
(2.5K R).