HP 70340A, User Manual

Page: 310 / 445

[SOURce[1]:]PULSe:TRANsition:ST A T e
2
SOURce
2
1
3
:
3
PULSe:TRANsition:STATe
ON
OFF
The \[SOURce[1]:]PULSe:TRANsition:ST A T e" command turns man ual pulse risetime
selection on or o.
The parameters are as follows:
ON T urns man ual pulse risetime selection on (y ou can select one of three pulse
risetimes using the \[SOURce[1]:]PULSe:TRANsition[:LEADing]" command).
OFF T urns man ual pulse risetime selection o (the instrumen t automatically selects
optimum pulse risetime for the selected carrier frequency range).
Once man ual pulse risetime selection has b een turned on using the
\[SOURce[1]:]PULSe:TRANsition:ST A T e" command, one of three pulse risetimes
can b e selected using the \[SOURce[1]:]PULSe:TRANsition[:LEADing]" command.
When the Signal Generator is set to the preset state, pulse risetime selection is turned o.
Application for Manual Pulse Risetime Selection
A series of low pass lters are used to reduce output harmonics when the Signal Generator
output frequency is less than 1 GHz. The lter passbands can b e narrow enough to induce
pulse ringing if the pulse risetime is to o fast.
The Signal Generator automatically selects a slow er pulse risetime as the carrier frequency is
decreased to minimize ringing and video feedthrough caused b y the low pass ltering. The
appropriate pulse risetime is automatically selected as follo ws:
Output F requency Pulse Risetime
10 MHz to 64 MHz 300 ns
64 MHz to 500 MHz 30 ns
Greater than 500 MHz 10 ns
In applications where a faster pulse risetime than that sho wn in the table is needed at a
particular output frequency , y ou can man ually c ho ose a pulse risetime. The disadv an tage of
c ho osing a faster pulse risetime is degraded pulse p erformance.
7-86 Programming Commands
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