Sequoia Series 175
6.7 Controlling the Instantaneous Voltage and Current Data Buffers
Measurements taken by the power source are based on a digital representation of the voltage and
current waveforms. Both waveforms are digitized with 18 bits of amplitude resolution and 25.6 sec of
time resolution. (49Ks/sec real-time sampling rate) for single phase configuration. The available
memory depth to hold this information is 4K (4096 samples) for each waveform. This section covers
the SCPI commands that can be used to control the position of the trigger point in the 4K deep data
buffer.
6.7.1 Query the Voltage and Current Sampling Rate
The output voltage and current sampling rate is:
96 kHz (period = 10.4 sec) for single-phase configuration. This means that it takes about 42.6
milliseconds to fill up 4096 data points in the voltage and current data buffers with the information
required to make a measurement calculation.
You can query this data sampling rate with:
SENSe:SWEep:TINTerval?
The sample period is 31.2 microseconds for the three-phase mode. The sample interval can be
increased from its minimum value in increments of this minimum value up to 10 times. This increases
the data acquisition window at the expense of sampling resolution. Be aware of possible aliasing if
higher fundamental frequencies are programmed or if higher frequency harmonics are present in the
voltage or current when decreasing the sample rate. See paragraph 4.20 for command syntax.
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