Pendulum CNT91 frequency counter

class pymeasure.instruments.pendulum.cnt91.CNT91(adapter, name='Pendulum CNT-91', **kwargs)

Bases: SCPIUnknownMixin, Instrument

Represents a Pendulum CNT-91 frequency counter.

property batch_size: int

Get maximum number of buffer entries that can be transmitted at once.

buffer_frequency_time_series(channel, n_samples, sample_rate=None, gate_time=None, trigger_source=None, back_to_back=True)

Record a time series to the buffer and read it out after completion.

Parameters:

  • channel (str) – Channel that should be used

  • n_samples (int) – The number of samples

  • gate_time (Optional[float]) – Gate time in s (default: None)

  • trigger_source (Optional[str]) – Optionally specify a trigger source to start the measurement (default: None)

  • back_to_back (bool) – If True, the buffer measurement is performed back-to-back. (default: True)

  • sample_rate (Optional[float]) –

    Sample rate in Hz

    Deprecated since version 0.14: Use parameter gate_time instead. (default: None)

Return type:

None

configure_frequency_array_measurement(n_samples, channel, back_to_back=True)

Configure the counter for an array of measurements.

Parameters:

  • n_samples (int) – The number of samples

  • channel (str) – Measurement channel (A, B, C, E, INTREF)

  • back_to_back (bool) – If True, the buffer measurement is performed back-to-back. (default: True)

Return type:

None

property continuous: Any

Control whether to perform continuous measurements.

property external_arming_start_slope: Any

Control slope for the start arming condition (str ‘POS’ or ‘NEG’).

property external_start_arming_source: Any

Control external arming source (‘A’, ‘B’, ‘E’ (rear) or ‘IMM’ for immediately arming).

property format: Any

Control response format (‘ASCII’ or ‘REAL’).

property gate_time: Any

Control gate time of one measurement in s (float strictly from 2e-8 to 1000).

property interpolator_autocalibrated: Any

Control if interpolators should be calibrated automatically (bool).

property measurement_time

Control gate time of one measurement in s (float strictly from 2e-8 to 1000).

Deprecated since version 0.14: Use gate_time instead.

read_buffer(n=10000)

Read out n samples from the buffer.

Parameters:

n (int) – Number of samples that should be read from the buffer. The maximum number of 10000 samples is read out by default. (default: 10000)

Returns:

list[float] – Frequency values from the buffer.