BNC 645 - Manual (Page 37)

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VOLTage:OFFSet {<offset>︱MINimum︱MAXimum }
Notes
• In the APPL:NOIS command, the frequency parameter has no
effect, but you still need to specify a value or “DEFault” for it.
4.5 Pulse Waveform
A pulse waveform consists of a period, a pulse width, an ascending edge
and a descending edge. The parameters are described further below.
Pulse Period / Frequency
The default pulse period is 1 ms (or 1kHz in frequency), and the
allowable value is ranged from 100 ns to 2000s (or 10 MHz down to
0.5mHz in frequency). Pulse period constrains the other parameters with
the following equation:
PulsePeriod ≥ PulseWidth + 1.6 x EdgeTime
The waveform generator adjusts the other parameters when needed to
accommodate the given pulse period.
Pulse Width
The pulse width represents the time from the 50% point of the ascending
edge to the 50% point of the following descending edge.
The default
pulse width is 100 μs, and the possible value is ranged from 20 ns to
2000s. The actual allowable range is determined as follows:
1.6 x EdgeTime ≤ PulseWidth ≤ PulsePeriod − 1.6 x EdgeTime
Wmin ≤ PulseWidth ≤ PulsePeriod − Wmin
where Wmin is the minimum allowable value determined by the following
conditions on PulsePeriod: