159
greater than the pulse duty cycle and is under the following constraints:
Duty Cycle Deviation
≤
Duty Cycle – 100
Χ
Minimum Width/Period
And
Duty Cycle Deviation
≤
100 – Duty Cycle – 100
Χ
Minimum Width/Period
Where
Wmin = 20 ns for period
≤
10 s.
Wmin =
20 ns for period
> 10 s, but
≤
100 s.
Wmin =
2
μ
s for period
> 100 s, but
≤
1000 s.
Wmin =
20
μ
s for period
> 1000 s.
The duty cycle deviation also needs to conform to the following rules:
Duty Cycle Deviation
≤
Duty Cycle-(160
Χ
Edge Time)/Period
And
Duty Cycle Deviation
≤
100-Duty Cycle-(160
Χ
Edge Time)/Period
When you choose an external source (PWM:SOUR EXT), the duty cycle deviation
is controlled by the ±5V signal level shown on the
Modulation In
connector on
the rear panel. It means that when the modulating signal is at +5V, the output
will be at its maximum width deviation, and when the modulating signal is at -5V,
the output will be at its minimum duty cycle. Lower external signal levels
produce less deviation, and negative signal levels produce negative deviation.
Note: The operation of this command is affected by FUNC:PULS:HOLD
command. FUNC:PULS:HOLD command decides if the pulse width or the duty
cycles are to be held constant as the period varies. If the pulse width is held
constant, so is the pulse width deviation; If the duty cycle is held constant, so is
the duty cycle deviation. If one is held constant, the other specified in the
command will be automatically converted to the equivalent value.
PWM:DEViation:DCYCles? [MINimum|MAXimum]
Query the duty cycle deviation in PWM. The duty cycle deviation in percent will
be returned.
PWM:SOURce {INTernal|EXTernal}
Specify the modulating signal source. The waveform generator takes either an
internal or an external source. The default is internal. When choosing an
Summary of Contents for G5100A
Page 5: ...5 D APPLICATION PROGRAMS 173 ...
Page 71: ...71 Schematic of Receiver ...