[Source:]Frequency; [Source:] - HP E1340A User Manual

[SOURce:]FREQuency

Coupling Rules
Chapter 7
The [SOURce:]FREQuency
generator.
The generator uses a direct digital synthesis (NCO) technique to generate
the specified frequencies. It has an upper frequency limit of the reference
oscillator frequency multiplied by .468749999767 and has a resolution of
.01 Hz when used with the built-in 42.94 MHz reference oscillator.
The swept commands
STARt
commands. When sending these commands, the following rules apply:
If either STARt or
preserved, but the
to the following equations:
CENTer= (STARt + STOP)/2
SPAN = STOP - STARt
If either
CENTer
preserved, but the
the following equations:
STARt = CENTer - (SPAN/2)
STOP = CENTer + (SPAN/2)
If any two commands are sent as part of a frequency-coupled group
within a single program message, then these two will be set as
specified, and the other two will change. If more than two are sent in
the group, the sweep will be determined by the last two received.
When MINimum and MAXimum
that will be set are the minimum and maximum values that will not cause
any of the ,
STARt STOP
minimum and maximum possible frequencies, given the coupling equations
above. For example, if
SPAN
FREQuency:CENTer MINimum
rule exists, however: since the minimum
(assuming the internal reference oscillator), a command string such as
FREQuency:CENTer 0;SPAN MINimum
will attempt to set the
STARt
FREQuency:STARt 15e6;STOP MINimum
value greater than 15 MHz.
[SOURce:]FREQuency:DOWNload :COMPlete
subsystem controls the HP E1340A's frequency
, , , and
STOP CENTer
STOP is sent singly, the value of the other is
and values will change according
CENTer SPAN
or is sent singly, the value of the other is
SPAN
STARt and STOP values will change according to
are used with these commands, the values
, , and values to go beyond the
CENTer SPAN
is currently set to 1 MHz,
would set 500 kHz. An exception to this
SPAN is .01 Hz per sweep point
has no valid value for
frequency to a negative value. Similarly,
will attempt to set
HP E1340A Command Reference
are coupled
SPAN
, and
SPAN
STOP to
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