Suffixes And Multipliers; Response Data Types; Scpi Command Completion - Keysight Technologies N3301A Programming Manual

Suffixes and Multipliers

Class
Amplitude
Current
Power
Resistance
Slew Rate

Response Data Types

Character strings returned by query statements may take either of the following forms, depending on the
length of the returned string:
Character Response Data. Permits the return of character strings.
<CRD>
Arbitrary ASCII Response Data. Permits the return of undelimited 7-bit ASCII. This data type
<AARD>
has an implied message terminator.
String Response Data. Returns string parameters enclosed in double quotes.
<SRD>

SCPI Command Completion

SCPI commands sent to the electronic load are processed either sequentially or in parallel. Sequential
commands finish execution before a subsequent command begins. Parallel commands allow other
commands to begin executing while the parallel command is still executing. Commands that affect trigger
actions are among the parallel commands.
The *WAI, *OPC, and *OPC? common commands provide different ways of indicating when all
transmitted commands, including any parallel ones, have completed their operations. The syntax and
parameters for these commands are described in chapter 4. Some practical considerations for using
these commands are as follows:
This prevents the electronic load from processing subsequent commands until all
*WAI
pending operations are completed.
This places a 1 in the Output Queue when all pending operations have completed.
*OPC?
Because it requires your program to read the returned value before executing the next
program statement, *OPC? can be used to cause the controller to wait for commands
to complete before proceeding with its program.
This sets the OPC status bit when all pending operations have completed. Since your
*OPC
program can read this status bit on an interrupt basis, *OPC allows subsequent
commands to be executed.
The trigger system must be in the Idle state in order for the status OPC bit to be true.
NOTE:
Therefore, as far as triggers are concerned, OPC is false whenever the trigger system is
in the Initiated state.
Suffix
V
A
W
OHM
A/s
R/s
V/s
Time s
Common Multipliers
1E3
1E-3
1E-6
Introduction to Programming - 2
Unit Unit with Multiplier
volt
ampere MA (milliampere)
watt MW (milliwatt)
ohm MOHM (megohm)
amps/second
ohms/second
volts/second
second MS (millisecond)
K
M
U
MV (millivolt)
kilo
milli
micro
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