User manual

Part 6: IEEE 488.2 Command Reference
Operators Available with DFP Option
These operators are available with the installation of the Digital Filter Package option.
Operators Additional Parameters Description
FILTER(<source>) FIRORIIR,{FIR, IIR}
FILTERKIND,{LOWPASS, HIPASS,
PASSBAND}
FILTERTYPE,{BESSEL, BUTTERWORTH,
CHEBYSHEV, INVCHEBYSHEV}
KAISERBETA,<value> PCT
GAUSSIANBT,<value> PCT
COSINEBETA,<value> PCT
TRANSITIONWIDTH,<value> HZ
F3DBWIDTH,<value> HZ
STOPBANDATTENUATION,<value> DB
PASSBANDRIPPLE,<value> DB,
PASSBANDATTENUATION,<value> DB
LOWFREQSTOP,<value> HZ
LOWFREQPASS,<value> HZ
HIGHFREQSTOP,<value> HZ
HIGHFREQPASS,<value> HZ
F3DBFREQ,<value> HZ
CORNERFREQ,<value> HZ
CENTERFREQ,<value> HZ
ROLLOFF,<value>
NUMBEROFTAPS,<value>
NUMBEROFSTAGES,<value>
ADVANCED,{ON, OFF}
AUTOLENGTH,{ON, OFF}
Digital filter, available with DFP option.
FIR(<source>) FTYPE,{LOWPASS, HIPASS, BANDPASS,
BANDSTOP, RAISEDCOS, RSDROOTCOS,
GAUSSIAN, CUSTOM}
FREQ,<lower or only corner freq. in HZ>
UFREQ,<upper corner freq.≥lfreq in HZ>
FWIDTH,<transition region in HZ>
FBETA,<0 to 100% >
MCOEFF,<M1 to M
n
>
Finite Impulse Response filter, available
with DFP option.
FWIDTH must be >0.3% of sample rate.
<lfreq> - <fwidth> must be 0.1% of sample
rate.
For raised cos and raised root cos, FBETA
is % of <lfreq> + and - over which trans-
ition region extends. For Guassian, % of
<lfreq> at which response is 3dB down
from DC.
Examples
The following instruction defines F1 to compute the summed average of C1 over 200 sweeps:
F1:DEF EQN,'AVG(C1)',AVRAGETYPE,SUMMED,SWEEPS,200
The following instruction defines F1 to compute the product of C1 and C2:
F1:DEF EQN,'C1*C2'
The following instruction defines F1 to compute the Power Spectrum of the FFT of C1. The window
function is Rectangular.
F1:DEF EQN,'PS(FFT(C1))',WINDOW,RECT
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