Entering a Frequency Scale
This factor scales the frequency axis (the X-axis) by:
where:
f is frequency in Hertz
freq scale is the scale frequency
The frequency can be entered in Hz; the range is 10
-6
to 10
+6
. The default
value is 1 Hz/Hz (that is, unitless, even though the units key is used to
complete numeric entry). If you have polynomial coefficients in radians, you
can scale the frequency by 1/2Ï€ to avoid dividing by (2Ï€)
n
to obtain proper
X-axis scaling.
If you want the frequency axis to be in radians, enter a scale frequency of
1/(2Ï€). The enter parameters for H(s) in terms of radians (even though the unit
keys still say mHz, kHz, and Hz). The frequency axis is always labeled Hz
(Hertz); however, the X-axis cursor would not be interpreted as radians. Units
are not displayed by frequency scale in the synthesis table because this is a
frequency scaling operation, and hence has units such as Hz/Hz, Hz/kHz, or
Hz/mHz.
f
freq scale
Using the Scale Frequency
The scale frequency feature can be used to scale pole-zero data from radian per
second to Hz by setting the scaling value to 1/(2Ï€). The following are identical:
Hz Scale Frequency
Pole at -1 1
Radians Scale Frequency
Pole at -6.28318 0.159155
The pole is entered as -6.28 Hz but with frequency scaling set to 1/(2Ï€), the pole
will appear to be at - 1 Hz, which is - 6.28 radians.
Agilent 35670A
Operator's Guide Synthesis Option 1D3
15-21
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