2.3.3.3.149. NXlockin¶
Status:
base class, extends NXobject
Description:
A base class definition for a lock-in amplifier. ...
A base class definition for a lock-in amplifier.
The lock-in amplifier information: the device is being used to extract a (potentially) very weak input signal buried in the noisy background, where the input signal has the same frequency (or its harmonic) as a known reference signal, using heterodyne detection. This method extracts the amplitude and phase shift of the current signal to the reference. The reference signal might be created by a generator built-in into the lock-in amplifier.
Symbols:
No symbol table
- Groups cited:
Structure:
bias_divider: (optional) NX_CHAR
Bias divider for lock-in channel if if has. ...
Bias divider for lock-in channel if if has. Bias divider = V(ref)/[V(ref)+V(input)]
modulation_status: (optional) NX_BOOLEAN
Switch the lock-in modulation on or off.
modulation_signal: (optional) NX_CHAR
A periodic voltage signal generated by the lock-in, ...
A periodic voltage signal generated by the lock-in, usually applied to a sample and used to create a reference signal for the detection of the input signal
lockin_current_flip_sign: (optional) NX_NUMBER
The sign (1 or -1) that defines the sign of the lock-in current. ...
The sign (1 or -1) that defines the sign of the lock-in current. The calibration procedure with retracted tip is normally performed to compensate for the signal phase delay in SPM. The procedure yields two possible solutions, this number should be equal to 1 or -1 depending on which solution is chosen (this concept mainly used in STS experiments, e.g. in Nanonis machine).
reference_amplitude: (optional) NX_NUMBER {units=NX_ANY}
Amplitude of the reference signal for the lock-in amplifier.
reference_frequency: (optional) NX_NUMBER {units=NX_FREQUENCY}
Frequency of the reference signal for the lock-in amplifier.
reference_phase: (optional) NX_NUMBER {units=NX_ANGLE}
Phase of the reference signal set in the lock-in amplifier.
demodulated_signal: (optional) NX_CHAR
Type of the demodulated signal, current | voltage.
demodulated_frequency: (optional) NX_NUMBER {units=NX_FREQUENCY}
The frequency of the demodulated signal.
frequency_demodulation_bandwidth: (optional) NX_NUMBER {units=NX_FREQUENCY}
The bandwidth of the modulated signal that can be applied in frequency ...
The bandwidth of the modulated signal that can be applied in frequency demodulation mechanism.
demodulated_amplitude: (optional) NX_NUMBER {units=NX_ANY}
The amplitude of the demodulated signal.
demodulated_phase: (optional) NX_NUMBER {units=NX_ANGLE}
The phase of the demodulated signal.
demodulator_channels: (optional) NX_CHAR
List of the demodulator channels.
low_pass_N: (optional) NX_NUMBER {units=NX_FREQUENCY}
Frequency of the low-pass filter applied on the demodulated ...
Frequency of the low-pass filter applied on the demodulated signals (X,Y), cut-off frq (low pass filter) (for each DemodulatorChannels).
hi_pass_N: (optional) NX_NUMBER {units=NX_FREQUENCY}
Frequency of the high-pass filter applied on the demodulation ...
Frequency of the high-pass filter applied on the demodulation signal cut-off frq (hi pass filter) (for each DemodulatorChannels).
lp_filter_order_N: (optional) NX_NUMBER
Order of the low-pass filter applied on the demodulated signals (X, Y). ...
Order of the low-pass filter applied on the demodulated signals (X, Y). Reducing the bandwidth or increasing the order reduces noise on the demodulated signals, but increases settling and measurement times.
hp_filter_order_N: (optional) NX_NUMBER
Order of the high-pass filter applied on the demodulation ...
Order of the high-pass filter applied on the demodulation signal. This is used mainly to suppress a DC component of the input signal noise.
ref_phase_N: (optional) NX_NUMBER {units=NX_ANGLE}
An extra reference phase offset of reference signal with respect to the demodu ...
An extra reference phase offset of reference signal with respect to the demodulated signal (foreach Channels).
integration_time: (optional) NX_NUMBER {units=NX_TIME}
Integration time for the product of the input and the reference signals
harmonic_order_N: (optional) NX_NUMBER
The reference signal can be a higher harmonic of the modulation signal. ...
The reference signal can be a higher harmonic of the modulation signal. Here the order of the harmonic is stored.
sensitivity_factor: (optional) NX_NUMBER
Ratio of output signal amplitude to input signal amplitue (V/V).
hardware: (optional) NXfabrication
Hardware manufacturers and type (product number) of lock-in amplifier.
AMPLIFIER: (optional) NXamplifier
Description of the amplifier (after detection of the signal from the noise)
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