Model 6485 Picoammeter Instruction Manual Relative, mX+b, m/X+b (reciprocal), and log 5-5
If the instrument is programmed to perform an infinite number of measurements (arm
count or trigger count set to infinite), you cannot use the :DATA? command to return
Rel’ed readings. However, you can use the :DATA:LATest? command to return the last
Rel’ed reading after aborting the measurement process. After sending the INITiate com-
mand to start the measurement process, use the ABORt command to abort the measure-
ment process, then use :DATA:LATest? to return to the last Rel’ed reading.
Programming example — relative
This program fragment establishes a 1µA baseline for measurements:
CALC2:NULL:OFFS 1e-6 ' Set Rel value of 1µA.
CALC2:NULL:STAT ON ' Enable Rel.
CALC2:FEED SENS ' Rel input signal.
INIT ' Trigger reading(s).
CALC2:DATA? ' Request Rel’ed reading.
mX+b, m/X+b (reciprocal), and Logarithmic
mX+b and m/X+b
The following math operations manipulate normal display readings (X) mathematically
according to the following calculations:
Y = mX+b
Y = m/X+b
where: X is the normal display reading
m and b are user-entered constants for scale factor and offset
Y is the displayed result
NOTE Changing the “m” or “b” for mX+b also changes it for m/X+b.
Pressing the mX + b key toggles the state of the mX+b math calculation on or off. When
pressed, the MATH annunciator will toggle in addition to the presently selected units des-
ignator (default is an “X”) indicating the state of the mX+b math function (note that the m/
X+b calculation uses the same designator as selected for the mX+b calculation).
Configuring and controlling mX+b and m/X+b
To configure and control either of these math calculations, perform the following steps:
NOTE Enabling or disabling by pressing the mX+b key disables Rel (if Rel is enabled).
1. Press CONFIG and then MX+B (or M/X+B) to display the present scale factor:
M: +1.0000000 ^ (factory default)
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