# SR570 Lock-in Amplifier

class pymeasure.instruments.srs.SR570(adapter, name='Stanford Research Systems SR570 Lock-in amplifier', **kwargs)

  Bases: `SCPIUnknownMixin`, `Instrument`

  property bias_enabled

    Boolean that turns the bias on or off. Allowed values are: True (bias on) and False (bias off)

  property bias_level

    A floating point value in V that sets the bias voltage level of the amplifier, in the [-5V,+5V] limits. The values are up to 1 mV precision level.

  blank_front()

    “Blanks the frontend output of the device

  clear_overload()

    “Reset the filter capacitors to clear an overload condition

  disable_bias()

    Turns the bias voltage off

  disable_offset_current()

    “Disables the offset current

  enable_bias()

    Turns the bias voltage on

  enable_offset_current()

    “Enables the offset current

  property filter_type

    A string that sets the filter type. Allowed values are: [‘6dB Highpass’, ‘12dB Highpass’, ‘6dB Bandpass’, ‘6dB Lowpass’, ‘12dB Lowpass’, ‘none’]

  property front_blanked

    Boolean that blanks(True) or un-blanks (False) the front panel

  property gain_mode

    A string that sets the gain mode. Allowed values are: [‘Low Noise’, ‘High Bandwidth’, ‘Low Drift’]

  property high_freq

    A floating point value that sets the highpass frequency of the amplifier, which takes a discrete value in a 1-3 sequence. Values are truncated to the closest allowed value if not exact. Allowed values range from 0.03 Hz to 1 MHz.

  property invert_signal_sign

    An boolean sets the signal invert sense. Allowed values are: True (inverted) and False (not inverted).

  property low_freq

    A floating point value that sets the lowpass frequency of the amplifier, which takes a discrete value in a 1-3 sequence. Values are truncated to the closest allowed value if not exact. Allowed values range from 0.03 Hz to 1 MHz.

  property offset_current

    A floating point value in A that sets the absolute value of the offset current of the amplifier, in the [1pA,5mA] limits. The offset current takes discrete values in a 1-2-5 sequence. Values are truncated to the closest allowed value if not exact.

  property offset_current_enabled

    Boolean that turns the offset current on or off. Allowed values are: True (current on) and False (current off).

  property offset_current_sign

    An string that sets the offset current sign. Allowed values are: ‘positive’ and ‘negative’.

  property sensitivity

    A floating point value that sets the sensitivity of the amplifier, which takes discrete values in a 1-2-5 sequence. Values are truncated to the closest allowed value if not exact. Allowed values range from 1 pA/V to 1 mA/V.

  property signal_inverted

    Boolean that inverts the signal if True

  unblank_front()

    Un-blanks the frontend output of the device