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2074
User Manual
Applying Filters
3-24
There are four parameters you can adjust for the SYNC output:
Active Channel – When you select CH1, CH2, CH3 or CH4,
subsequent programming will apply to the selected channel
only. For example, if you want to program the sync position for
channel 3, press key number 3 on the keypad and observe that
the CH3 option is checked. You can then move forward to
program the sync position for channel 3. Note that when you
exit this menu, the display will still be associated with channel 3
programming so if you intend to program another channel,
select the required channel, as explained in the above.
Position – Lets you place the sync start at any point along the
length of the waveform. Placement resolution is 4 points. As
default, the sync signal is positioned at the beginning of the
waveform. Position is unique for each channel so if you change
from channel to channel, you can see that the field is updated
with the correct position, as was programmed for the specific
channel.
Four 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.
The built-in filters are available for the user in standard, arbitrary,
sequenced and modulated modes. The only function where the
Model 2074 does not allow external control is when standard
sinusoidal waveform is selected.
The default output function of the generator is the sine
waveform. The instrument is using filters to reconstruct
this waveform and therefore, the state of the filters 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 another output
function.
If you do not plan on using the filters, make sure that you leave the
selection OFF. This will eliminate confusing setting conflicts.
Modification of the filter state and range is done from the Outputs
menu. To access this menu select the Outputs screen as shown in
Figure 3-12.
Note
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