HP 33120A, User Manual

Page: 83 / 118

FSK “Hop” Frequency
•
Hop frequency: 10 mHz to 15 MHz (100 kHz for triangle and ramp).
The default is 100 Hz. You can use sine, square, ramp, triangle, or
arbitrary waveforms for the hop frequency waveshape.
•
For arbitrary waveforms , the maximum hop frequency depends on
the number of points specified in the waveform. The five built-in
arbitrary waveforms can be output at a maximum of 5 MHz.
•
For an externally-controlled
FSK
waveform, the carrier frequency is
output when a “low”
TTL
level is applied to the FSK terminal. The hop
frequency is output when a “high”
TTL
level is applied.
•
For
FSK
, the sync signal is referenced to the
FSK
“hop” signal (not the
carrier). A momentary
TTL
“high” pulse (> 200 ns) is output on the
transition to the “hop” frequency. The signal is output from the front-
panel
SYNC terminal.
•
Front-Panel Operation : After enabling
FSK
, press Recall Menu to go
directly to the
FSK FREQ
command in the menu.
8: FSK FREQ (MOD MENU)
•
Remote Interface Operation :
FSKey:FREQuency {<
frequency
>|MINimum|MAXimum}
Number of Arb Points
8 to 8,192 (8k)
8,193 to 12,287 (12k)
12,288 to 16,000
Minimum Frequency
10 mHz
10 mHz
10 mHz
Maximum Frequency
5 MHz
2.5 MHz
200 kHz
Chapter 3 Features and Functions
Frequency-Shift Keying (FSK) Modulation
92