AMETEK BPS Series Programming Manual - Manual (Page 162)

AMETEK Programmable Power BPS / MX / RS Series SCPI Programming Manual
162 Manual P/N 7003-961 Rev AA
6.7 Controlling the Instantaneous Voltage and Current Data Buffers
Measurements taken by the AC/DC 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
μsec 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 [3Pi Controller Only]
The output voltage and current sampling rate is:
MX Series I: 39 kHz (period = 25.6
μsec) for single-phase configuration (MX45-1 or
MX30-3Pi/MX45-3Pi in single phase mode). This means that it takes about 104 milliseconds
to fill up 4096 data points in the voltage and current data buffers with the information
required to make a measurement calculation.
MX Series II and RS Series: 96 kHz (period = 10.4
μsec) for single-phase configuration
(MX15, MX45-1 or MX30-3Pi/MX45-3Pi in single phase mode). 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 76.8 (Series I) or 31.2 (Series II and RS Series) microseconds for
three-phase models or the MX30-3Pi/MX45-3Pi in three-phase configuration. 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 4.16 for command syntax.