Keithley 2701 User Manual

12-8 Common Commands Model 2701 User’s Manual
I *WAI — Wait-to-Continue Prevent execution of commands until
previous commands are completed
Description
Two types of device commands exist:
• Sequential commands – A command whose operations are allowed to finish
before the next command is executed.
• Overlapped commands – A command that allows the execution of subsequent
commands while device operations of the Overlapped command are still in
progress.
Use the *WAI command to suspend the execution of subsequent commands until the
device operations of all previous Overlapped commands are finished. The *WAI command
is not needed for Sequential commands.
The Model 2701 has three overlapped commands:
• :INITiate
• :INITiate:CONTinuous ON
• *TRG
NOTE See *OPC, *OPC?, and *TRG for more information.
The INITiate commands remove the Model 2701 from the idle state. The device
operations of :INITiate are not considered complete until the Model 2701 returns to idle.
By sending the *WAI command after the INITiate command, all subsequent commands
will not execute until the Model 2701 goes back into idle.
The *TRG command issues a bus trigger that could be used to provide the arm, scan, and
measure events for the Trigger Model. By sending the *WAI command after the *TRG
command, subsequent commands will not executed until the pointer for the Trigger Model
has finished moving in response to *TRG and has settled at its next state.
Programming example – The following command sequence shows how to use the *WAI
command to allow the 2701 to wait for the programmed measurements to be completed
before requesting a reading.
SYST:PRES ' Returns 2701 to default setup.
INIT:CONT OFF ' Disables continuous initiation.
ABORt ' Aborts operation. Places 2701 in idle.
TRIG:COUN 1 ' These two commands configure the 2701
SAMP:COUN 30 ' to perform 30 measurements.
INIT ' Starts measurement process.
*WAI ' Sends the WAI command. Program waits for
' 2701 to go into idle before executing next command.
DATA? ' Requests one reading.

Keithley 2701 Specifications

General

Max Voltage	300 V
Max Current	3 A
Frequency Range	3 Hz to 500 kHz
Frequency Accuracy	0.01%
Weight	3.6 kg
Measurement Functions	Frequency, Temperature
Interface	IEEE-488 (GPIB), RS-232
DC Voltage Range	300 V
DC Current Range	3 A
AC Voltage Range	300V
AC Current Range	1 μA to 3 A
Resistance Accuracy	0.01%
Channels	10
Dimensions	213mm x 88mm x 370mm