Board Cleaning - Keithley 2000-Scan Instruction Manual

Board cleaning

NOTE Failure to observe the following precautions may result in degraded card
performance.
When soldering resistors, be sure not to touch areas not associated with resistor installation
or spread flux around to other areas of the circuit board. Use solder with an OA (organic
activated) flux. The circuit board should be thoroughly cleaned with pure water after soldering
to remove all contaminants. After cleaning with water, swab the area with pure methanol, then
allow the board to dry for several hours in a 50°C environment before use.
Current measurements
Even with the current shunts installed, you cannot make direct current measurements with the
scanner card. Instead, you must close the channel to be measured, and measure the voltage
across the shunt. The current can then be calculated as follows:
Where: I = current being determined
V= voltage measured by multimeter
R= shunt resistance value
Instead of manually calculating current, set up a Model 2000/2001/2002 mX + b math
calculation function. (Here, m = 1/R and b = 0.). The multimeter will then display the actual
current value. Refer to the multimeter manuals for details on using math functions.
Card Connections and Installation 2-13