Specifications

5-11

System Command Reference Section

Control of User Pattern A to B Changeover in the Generator

APCHange is a contraction of the phrase alternate pattern change andisusedtocontrol

how user-defined patterns are output when set to be used as alternate patterns.

[SOURce[1]:]PATTern:APCHange:SOURce EXTernal|INTernal

This command control the source of control for the alternate pattern output. When

EXTernal is selected the pattern is controlled by the rear-panel Auxiliary Input socket.

When INTernal is selected the pattern is controlled by the user, either from the front-panel

or from GP-IB using other commands from within this group.

The *RST selection is “EXTernal”.

[SOURce[1]:]PATTern:APCHange:MODE ALTernate|ONEShot

This command controls the mode of operation of the alternate pattern output. If

ALTernate is selected and the source is set to EXTernal, then the polarity of the signal at

the Auxiliary Input socket governs which half of the pattern is output. If the source is set

to INTernal, then the :APCHange:SELect command control which half of the pattern is

output.

If the MODE is set to ONEShot and the source is set to EXTernal, then a single insertion

of a number of instances of half B of the pattern is output for each rising edge of the

Auxiliary Input. If the source is set to INTernal, then the :APCHange:IBHalf command is

used to insert one instance of half B of the pattern. The number of half B instances is equal

to the smallest integral multiple of the pattern length that divides exactly by 256.

The *RST selection is “ALTernate”.

[SOURce[1]:]PATTern:APCHange:SELect AHALf|BHALf

This command controls whether half A or half B of the alternate pattern is output. It is

valid only when :APCHange:SOURce is set to INTernal and :APCHange:MODE is set to

ALTernate.

The *RST selection is “AHALf”.

[SOURce[1]:]PATTern:APCHange:BHaIf ONCE:

This command is short for Insert B Half. It causes the single insertion of a number of

instances of half B of the alternate pattern to be inserted. It is valid only when

:APCHange:SOURce is set to INTernal and :APCHange:MODE is set to ONSHot. It is an

event command, and as such has no query form. The number of half ‘B’ insertions is equal

to the smallest integral multiple of the pattern length that divides exactly by 256.