Keithley SourceMeter 2400, Service Manual, Page: 48 / 137

Model 2400 Service Manual 2-20
Calibration
2400-902-01 (G - Feb 2006)
• Send the source and sense commands using the multimeter reading as the
parameter. For example:
:CAL:PROT:SOUR 1.997
:CAL:PROT:SENS 1.997
• Send the :SOUR:VOLT 0.0 command to set the source voltage to 0V.
• 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 -1.02E-3
Step 3. Current Calibration
1. Connect the Model 2400 to the digital multimeter (see Figure 2-2), and select the multi-
meter DC current function.
2. Send the commands summarized in Table 2-10 in the order listed to initialize current
calibration.
Table 2-10
Current calibration initialization commands
Command Description
:SOUR:FUNC CURR
:SENS:VOLT:PROT 20
:SENS:VOLT:RANG 20
:OUTP:STAT ON Select source current mode.
Voltage limit when current source is active.
Make sure 200V range is not active.
Turn source on.
3. Calibrate each current range using the procedure summarized in Table 2-11. For each
range:
• Send the :SOUR:CURR:RANG command to select the source and sense range
being calibrated. For example, for the 1mA range, the command is:
:SOUR:CURR:RANG 1E-3
• 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.