Table of Contents
Advertisement
5-12
SxIohms
Calculates and displays low resistance reading for 7751/7752/7753 module in slot x
(where x =1 or 2). This math function is a shortcut for the mX+b calculation. When
selected, the following "m" and "b" factors are used:
m = 1 / I
b = 0
Calculation:
where: I
When the SxIohms calculation is selected, the Model 2790 measures voltage (X) and cal-
culates mX+b using the above factors. The displayed reading will be in ohms (Ω).
klqb
When using the low ohms calculation, the highest DCV measurement range that can be
selected is 1V. Attempting to select a higher range will cause error -222 (Parameter out of
range). Attempting to turn autoranging on generates error -221 "Settings conflict" over the
GPIB or a "NO AUTORANGE" message on the display if done from the front panel
AUTO key.
SOUR
R = mX + b
= (1/ I
SOUR
= V
/ I
MEAS
is the programmed current level of the I-source of the 7751/7752/7753.
SOUR
1 / I
is the "m" factor for the calculation (mX+b).
SOUR
V
is the measured voltage by the DMM of the Model 2790. It is the "X"
MEAS
variable for the calculation (mX+b).
SxIohms cannot be selected if the I-source is set to 0mA. Since "m" = 1 / I
dividing 1 by 0 would result in an erroneous reading (positive infinity).
Model 2790 SourceMeter
) × V
+ 0
MEAS
SOUR
®
Switch System Reference Manual
,
SOUR
Advertisement
Table of Contents
