Keithley 6220 Reference Manual page 148

5-28 Delta, Pulse Delta, and Differential Conductance
8.
9.
Operation – PC control
The system configuration for PC control of the Model 622x is shown in
1.
2.
3.
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If a finite Delta count is being used, the Delta measurements will stop after
the last Delta measurement is performed. However, Delta remains armed
and can be run again by pressing the TRIG key. The new Delta readings
will overwrite the old readings in the buffer.
If the infinite Delta count is being used, Delta will run continuously. If the
buffer fills, Delta readings will stop being stored, even though Delta
continues to run.
When finished, press EXIT to disarm Delta.
On the Model 622x, press RECALL to access the Delta readings stored in
the buffer.
Connections are shown in the following figures. All power must be removed
from all components in the system before making connections:
• Figure 5-4, page 5-8
• Figure 5-5, page 5-10
Configure communications for the Models 2182/2182A and 622x as
explained in "Configuring communications," on page
On the Model 2182/2182A, select the desired measurement range and
integration rate. These Model 2182/2182A settings can be made from the
front panel or remote programming can be used. Rate must be set to an
integer value (1, 2, 3, ... up to 50 or 60). If some other rate is selected, it will
automatically be changed to 1PLC by Model 622x during the arming pro-
cess.
For front panel operation, use the RANGE keys to select the measurement
range. To set the integration rate, use the RATE key.
Commands from the PC to control the Model 2182/2182A are addressed to
the Model 622x. Each command is then routed through the Model 622x out
the serial port (RS-232) to the Model 2182/2182A. The following command
word is used for this communication process:
SYSTem:COMMunicate:SERial:SEND <data>
Where: <data> is a valid Model 2182/2182A command.
The following query command is used to return the response to a query
command sent over the serial port:
SYSTem:COMMunicate:SERial:ENTer?
When communicating over the serial port, there are no errors reported if a
Model 2182/2182A is not properly connected to the Model 622x.
Return to
Model 6220/6221 Reference Manual
– System connections.
– Test connections.
Section 5 topics
Figure 5-2B.
5-10.