Tabor Electronics 5251, User Manual

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TE5251
User Manual
4-18
FREQuency:RASTer{<sclk>|MINimum|MAXimum}(?)
Description
This command modifies the sample clock frequency of the arbitrary waveform in units of samples per
second (S/s). It has no affect on standard waveforms.
Parameters
Name Range Type Default Description
<sclk> 1.5 to
250e6 Numeric 1e7 Will set the sample clock frequency of the arbitrary
and sequenced waveform in units of S/s. Although
the display resolution for the frequency setting is 9
digits only, the frequency command can be used with
resolutions up to 14 digits. The accuracy of the
instrument however, can only be tested to this
accuracy using an external reference that provides
the necessary accuracy and stability
<MINimum> Discrete Will set the sample clock frequency to the lowest
possible frequency (1.5).
<MAXimum
> Discrete Will set the frequency of the standard waveform to
the highest possible frequency (300e6).
Response
The 5251 will return the present sample clock frequency value. The returned value will be in standard
scientific format (for example: 100MHz would be returned as 100e6 – positive numbers are unsigned).
FREQuency:RASTer:SOURce{EXTernal|INTernal}(?)
Description
This command selects the source of the sample clock generator. This command affects both the standard
and the arbitrary waveforms.
Parameters
Name Type Default Description
INTernal Discrete INT Selects an internal source.
EXTernal Discrete Activates the external sample clock reference input.
An external reference must be connected to the
5251, in the range of the internal source, for it to
continue normal operation. Observe the input level
and limitations before connecting an external signal.
Response
The 5251 will return EXT if an external source is selected, or INT if the internal source is selected.