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User Manual 301/302

Selecting the

Filter Type

Five filters are available for each channel. These filters have fixed

cutoff frequencies of which their properties are specified in Appendix

A. The built-in filters are switched in after the DAC circuit and are used

for reducing the noise, harmonics and spurious signals above the

cutoff frequency. More than 1 filter can be applied at any time, the

effects being additive.

The built-in filters are available for the user in standard, arbitrary and

sequenced modes. The only function where the Model 301/302 does

not allow external control is when standard waveforms sinusoidal

wave is selected.

Use the following command to activate the filter:

OUTPut:FILTer { OFF | ON}

ON enables the filter. The default filter state setting is OFF.

Use the following command to select the filter type:

OUTPut:FILTer:FREQuency {150M | 10M | 5M | 2.5M | 800K}

Note

The default output function of the generator is the sine waveform.

The instrument is using filters to generate this waveform therefore,

the state of the OUTP:FILT can not be changed until another output

function is selected. A setting conflict error will occur if one

attempts to change the filter state before changing to anothe

output function.

The default filter setting is 150M, meaning that following the

OUTP:FILT ON command, the 150 MHz filter is the active filter. 10M

selects filter having 10 MHz cutoff (3 dB) frequency. Similarly, the 5M,

2.5M and 800K have cutoff frequencies of 5 MHz, 2.5 MHz and

800KHz, respectively.

The query:

OUTPut:FILTer:FREQuency?

Queries the currently selected filter setting and returns either 150M,

10M, 5M, 2.5M or 800K.

The WaveWiz Filter tab from the Instrument Control Panel is shown in

Configuring The Instrument

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