Agilent Technologies 33120A, Руководство пользователя

Страница: 171 / 312

FSKey:SOURce {INTernal|EXTernal}
Select an internal or external
FSK
source. The default is INT .
[ Stored in volatile memory ]
œ
When the internal source is selected, the rate at which the output
frequency “shifts” between the carrier frequency and hop frequency
is determined by the
FSK rate specified (
FSK:INT:RATE
).
œ
When the external source is selected, the output frequency is
determined by the signal level on the rear-panel FSK terminal.
When a “low”
TTL
level is present, the carrier frequency is output.
When a “high”
TTL
level is present, the hop frequency is output.
œ
The maximum external
FSK
rate is 1 MHz.
œ
The
Ext
annunciator turns on when the function generator is waiting
for an external trigger signal.
FSKey:SOURce?
Query the internal
FSK
source. Returns “
INT
” or “
EXT
”.
FSKey:STATe {OFF|ON}
Disable or enable
FSK
modulation. To ensure proper operation, you
should enable
FSK
after you have set up the other modulation parameters.
Only one modulation mode can be enabled at a time. When you enable
FSK
, the previous modulation mode is turned off.
FSKey:STATe?
Query the state of the
FSK
mode. Returns “0” (
OFF
) or “1” (
ON
).
4
Chapter 4 Remote Interface Reference
Frequency-Shift Keying (FSK) Commands
169