Table 2-10 Current Calibration Initialization Commands - Keithley 2425 Service Manual

2-24 Calibration
4.
5.
Table 2-10
Current calibration initialization commands
:SOUR:FUNC CURR
:SENS:VOLT:PROT 20
:SENS:VOLT:RANG 20
:OUTP:STAT ON
• Use the multimeter reading as the parameter for the :CAL:PROT:SOUR and
:CAL:PROT:SENS commands. For example, a typical value for the 1mA
range would be:
:CAL:PROT:SOUR -1.025E-3
:CAL:PROT:SENS -1.025E-3
• Program the current source for 0A output using the :SOUR:CURR 0.0 com-
mand.
• Note the multimeter reading.
• Send the source and sense calibration commands using the multimeter reading
for the parameter. For example:
:CAL:PROT:SOUR 1E-6
:CAL:PROT:SENS 1E-6
• Set the source to the positive full-range value using the :SOUR:CURR com-
mand. For example, for the 1mA range:
:SOUR:CURR 1E-3
• Note and record the multimeter reading.
• Send the source and sense commands using the multimeter reading as the
parameter. For example:
:CAL:PROT:SOUR 1.03E-3
:CAL:PROT:SENS 1.03E-3
• Send the :SOUR:CURR 0.0 command to set the source current to 0A.
• Note and record the multimeter reading.
• Send the :CAL:PROT:SOUR command using the multimeter reading as the
command parameter. For example:
:CAL:PROT:SOUR 1E-6
Connect the 1Ω resistor and DMM to the Model 2425 INPUT/OUPUT jacks, as
shown in Figure 2-3. Select the DMM DC volts function.
Repeat step 3 for the 3A range using the calculated current as follows: I = V/R,
where V is the DMM voltage reading, and R is the characterized value of the 1Ω
resistor.
Command Description
Select source current mode.
Voltage limit when current source is active.
Make sure 100V range is not active.
Turn source on.
Model 2425 Service Manual