41
3.14.4 Setting the Arbitrary Frequency
The arbitrary waveform frequency is a function of the number of data points used to run the waveform (the length
parameter in the ARB menu) and the waveform execution point rate. The waveform execution point rate is the
execution time between each point in the waveform. The total time taken to run one period of the waveform is
given by:
Because the output frequency is a function of the rate and the number of points being executed, the output frequency
is calculated as:
For example, to set the output frequency to 1000 Hz, given the number of data points used for the waveform output is
1000, the rate is calculated as:
EXAMPLE: Setting the Output Frequency
To set the output frequency of a 1000 point waveform in execution memory to 1000 Hz, set the rate to 1 µs:
ACTION
KEYSTROKES
Step 1. Set the output rate to 1 µs (equivalent to
PARAMETER
1000 Hz output frequency)
F1 :RATE
1
KHz/us
3.14.5 Setting the Amplitude
The following equation represents the relative output amplitude voltage relationship between the front-panel
amplitude peak-to-peak setting and the data point values in waveform memory:
Where 16382 is the total data point value range in waveform memory.
Table
3-4:
Relative
Amplitude
for
Waveform
Output
(Examples)
Front Panel
Amplitude Setting
Data Point Value
Relative Output
Amplitude Voltage
5 V peak-to-peak
8191
2.5 V positive peak
5 V peak-to-peak
0
0 V (offset voltage)
10 V peak-to-peak
-8191
5 V positive peak
