BARTINGTON INSTRUMENTS
Page 14 of 19 OM2441/1
Gain is a simple multiplication of the signal, so a gain of 300 will, for example, convert a
1mV signal into a 300mV signal at the output. Gain can be set to 1, 50, 100, 300, 500 or 1000,
independently for the three channels.
Note:
Excessive gain will result in the SCU1 output becoming over-range. When applying
gain, start with gain = 1 and increment the control until you find the maximum setting that
does not cause the over-range condition.
Note:
Both AC and DC components of the adjusted magnetometer signals are amplified by
the gain. If a signal contains a large DC component, gain may cause the output to go over-
range. To prevent this, the DC component can be removed using the offset controls.
In general, gain is used to improve measurement resolution of small signals, usually when
studying AC fields or very slow changes to a background DC field. In these situations, any DC
signal present would normally be removed by using offset. This allows the level of gain to be set
as high as possible, without the output becoming over-range.
7.4.3. Low Pass Filter (LPF)
The LPF attenuates high frequencies above the -3dB setting, reducing their amplitude in the
SCU1 conditioned outputs. The LPF is intended to be used for removal of unwanted frequencies
present in the magnetic field being measured.
The LPF -3dB frequencies settings are 1, 10, 100, 1000 and 10000Hz.
The LPF cannot be completed disabled. If LPF is not required, use the 10000Hz setting to ensure
the maximum signal bandwidth is available.
7.4.4. High Pass Filter (HPF)
The HPF implements AC coupling of the magnetometer input signals, attenuating low frequency
signals below the HPF -3dB setting. The HPF is intended for the removal of DC and very slowly
changing signals.
The HPF -3dB frequencies settings are 0.01Hz, 1Hz, and OFF.
Use OFF when HPF (AC coupling) is not required.
