5520A
Operators Manual
6-10
6-14. Commands
The following is an alphabetical list of all Calibrator commands and queries, including
common commands and device-dependent commands. Each command title includes a
graphic that indicates remote interface applicability, IEEE-488 and RS-232, and
command group: Sequential, Overlapped, and Coupled.
IEEE-488 (GPIB) and RS-232 Applicability
IEEE-488 RS-232
xx
Each
command and query has a check box indicating applicability to IEEE-488 (general
purpose interface bus, or GPIB) and RS-232 remote operations. For sorting purposes,
this list ignores the * character that precedes the common commands.
Sequential Commands
Sequential
x
Commands executed immediately as they
are encountered in the data stream are called sequential commands. For more
information, see “Sequential Commands” in Chapter 5.
Overlapped Commands
Overlapped
x
Commands that require additional time
to execute are called overlapped commands because they can overlap the next command
before completing execution. To be sure an overlapped command is not interrupted
during execution, use the *OPC, *OPC?, and *WAI commands to detect command
completion. For more information, see “Overlapped Commands” in Chapter 5.
Coupled Commands
Coupled
x
These are called coupled commands
(examples: CUR_POST and OUT) because they “couple” in a compound command
sequence. Care must be taken to be sure the action of one command does not disable the
action of a second command and thereby cause a fault. For more information, see
“Coupled Commands” in Chapter 5.
CFREQ?
Overlapped CoupledIEEE-488 RS-232 Sequential
xx xx x
(Capacitance Frequency query) Returns the optimal frequency for stimulus when
measuring or calibrating capacitance output.
Response: <value> of the optimal frequency
Example: CFREQ? returns 1.0E+2
Returns 100 Hz as the optimal frequency for the selected capacitance output (1.0 µF for
this example). The return is 0 if not sourcing capacitance.
CLOCK
Overlapped CoupledIEEE-488 RS-232 Sequential
xx xx x
(Real-Time Clock command) Sets the real time clock, time only, or date and time. To
set the date, the CALIBRATION switch must be in the ENABLE position.
Parameters: 1. (optional) year in the format YYYY
2. (optional) month in the format MM
3. (optional) day in the format DD
4. hour in the format HH
5. minute in the format MM
6. second in the format SS
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