Current Calibration Initialization Commands - Keithley SourceMeter 3A 2420 Service Manual

2-20 Calibration
4.
5.
Table 2-10

Current calibration initialization commands

Command
:SOUR:FUNC CURR
:SENS:VOLT:PROT 20
:SENS:VOLT:RANG 20
:OUTP:STAT ON
• Program the source to output the negative full-range value using the
:SOUR:CURR command. For example:
:SOUR:CURR -1E-3
• Note and record the multimeter reading.
• 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 command.
• 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 command.
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 param-
eter. 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 com-
mand parameter. For example:
:CAL:PROT:SOUR 1E-6
Connect the 1Ω resistor and DMM to the Model 2420 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.
Descripton
Select source current mode.
Voltage limit when current source is active.
Make sure 60V range is not active.
Turn source on.