SFRA45 User Manual
8-10
8.7
OUTPUT KEY
The Output key controls the
Signal Generator
. The signal
generator is a Direct Digital Synthesis (DDS) single or
sweep frequency generator. It generates Sine, Square and
Triangular waveforms over a frequency range from 5Hz to
45MHz, together with a noise option. The low-level output
is 10Vpk into high impedance load, (5Hz to 45MHz). It
may be used independently of the other instruments that
are connected to the instrument or in conjunction with
them. The output negative is connected to the case. The
maximum output available from the generator is a function
of frequency:
Frequency
output level into 50Ω
MHz
peak V
rms V
5
5
3.5
10
3
2
15
2
1.4
20
1.5
1
25
1.2
0.8
30
1
0.7
45
0.75
0.5
Amplitude Control
–
Has two options:
“V or dBm”
and
controls how ‘amplitude’ and ‘amplitude step’ is displayed
on the screen. Amplitude is displayed either in Volts or
dBm and is adjusted using the
“output amplitude”
or
“amplitude step”
menu function. Amplitude step is set in
either volts or db times the step value. The amplitude step
can be set as small as one millivolt or 0.001 dBm. (Once
the step has been set, using the up/down arrow keys with
the main display will increase/decrease the amplitude by
the step factor).
