User manual

IEEE-488 Reference
2001-900-01 Rev. K / August 2010 4-75
tern is placed on the other three lines of the output port, the >10µsec strobe pulse will be asserted on line
#4. The strobe is used to “inform” your external binning circuit that the output port (lines 1, 2 and 3) is
ready to be read.
The polarity of the strobe pulse is determined by the programmed polarity of output line #4 (see Output
subsystem). If line #4 is programmed for active-high polarity, the binning strobe will be a positive-going
pulse. Conversely, if programmed for active-low polarity, the strobe will be a negative-going pulse.
Programming example 10 OUTPUT 716; “:calc3:bstr on; bstr?”
20 ENTER 716; A$
30 PRINT A$
40 END
Line 10 Two commands in this program message; the first enables the binner strobe, and the second
queries the state of the strobe.
Line 20 Addresses the Model 2001 to talk.
Line 30 Displays the state of the binner strobe (1; on).
:IMMediate
:CALCulate3:IMMediate Perform CALC 3
Format :calc3:imm
Description When you change the configuration of the limit test, the next reading will be evaluated according to that
new test configuration. If the instrument is not in a continuous measurement mode (e.g., waiting for a
manual trigger), the test will not be performed until the next reading conversion occurs.
This action command allows you to re-process the current input data to test new limits. For example, as-
sume the instrument is in a non-continuous measurement mode and requires a manual trigger to cause
the next reading conversion. Changing the test limits will not affect the last test result. However, sending
the :IMMediate command will re-process the data and evaluate the reading according to the new test lim-
its. Note that sending the :IMMediate command does not initiate a reading conversion.
Programming example This example assumes that the instrument is configured to perform a limit test.
OUTPUT 716 “:trig:sour bus”
OUTPUT 716 “:calc3:imm”
The first message places the instrument in a “one-shot” measurement mode. While waiting for a bus trig-
ger, the test limit configuration can be changed. The second message re-performs the limit test on the
same reading.
4.14 :CALibration subsystem
The commands in this subsystem are summarized in Table 4-7. Details on using these commands to cal-
ibrate the Model 2001 are contained in the Model 2001 Calibration Manual.