Agilent Technologies Agilent 33500 Series, Руководство по эксплуатации и обслуживанию

Страница: 215 / 429

FUNCtion Subsystem
[SOURce[1|2]:]FUNCtion:ARBitrary:FREQuency {<
frequency
>|MINimum|MAXimum}
[SOURce[1|2]:]FUNCtion:ARBitrary:FREQuency? {MINimum|MAXimum}
[SOURce[1|2]:]FUNCtion:ARBitrary:PERiod {<
period
>|MINimum|MAXimum}
[SOURce[1|2]:]FUNCtion:ARBitrary:PERiod? {MINimum|MAXimum}
Sets the frequency or period for the arbitrary waveform.
Parameter Typical Return
< frequency > (Hz): Limited by the number of waveform points; default based on 40
kSa/s sample rate.
+1.00000000003
< period > (seconds): Limited by the number of waveform points; default based on
40 kSa/s sample rate.
+1.000000000000000E-03
Set arbitrary waveform frequency to 1000 Hz.
FUNC:ARB:FREQ 1000
l
With FUNCtion:ARBitrary:FILTer OFF , the arbitrary waveform sample rate is limited to 1/4 of the maximum sam-
ple rate.
l
The < frequency > ranges from 1 µHz to (Max Sample Rate(250 MSa/s) / ( 8 points), or 31.25 MHz. Frequency is
also limited by the Filter setting. With FUNCtion:ARBitrary:FILTer OFF , the arbitrary waveform sample rate is lim-
ited to 62.5 MSa/s, or 1/4 of the 250 MSa/s rate. Therefore, frequency is also reduced to 7.8125 MHz for an eight
point waveform.
l
The arbitrary waveform sample rate and frequency are not coupled to SOUR:FREQ , which applies to only non-arbi-
trary waveforms.
l
The arbitrary waveform plays at a speed specified by the sample rate. When setting the frequency or period of an
arbitrary waveform, the instrument changes the sample rate based on the number of points in the waveform and
the new frequency or period setting. The new frequency or period may be altered slightly to meet the restrictions
of Sample Rate resolution and the number of points. In other words, frequency will be recalculated from the new
sample rate and number of points to ensure compatibility between the coupled parameters. This is due to math res-
olution of 15 digits in combination with a sample rate that can also be 15 digits.
l
Changing the number of points in the waveform, or changing the sample rate with FUNCtion:ARBitrary:SRATe ,
changes the frequency and period settings.
[SOURce[1|2]:]FUNCtion:ARBitrary:POINts?
Returns the number of points in the currently selected arbitrary waveform.
Parameter Typical Return
(none) +100000
Return the number of points in the current arbitrary waveform on channel 1:
FUNC:ARB:POIN?
l
The maximum number of points depends on the instrument's memory, which is based on the model and options .
214 Agilent 33500 Series Operating and Service Guide