IBM Car Amplifier 7220 Manuel d'utilisateur télécharger pdf (Page 48)

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Chapter 5, FRONT PANEL OPERATION

5.2.04 Control Options Menu

Figure 5-5, Control Options Setup Menu

This menu, shown in figure 5-5, has three controls affecting the line frequency

rejection filter, AC Gain control and output time constants, as follows:-

Linefilt

This control sets the mode of operation of the internal line frequency rejection filter.

Early instruments have two possible settings for this control, ON or OFF. Note that in

these units the filter introduces significant gain and phase errors when measuring

signals in the frequency range from 5 Hz to 500 Hz.

Instruments manufactured after June 1996 which are fitted with the updated filter

hardware offer four possible settings for the control, as defined by the following

table:-

Legend Function

OFF Line filter inactive

F Enable 50 or 60 Hz notch filter

2F Enable 100 or 120 Hz notch filter

F&2F Enable both filters

AC Gain

As discussed in section 3.2.04, the correct adjustment of the AC Gain in a DSP lock-

in amplifier is necessary to achieve the best results. This control allows the user to

select whether this adjustment is carried out automatically or remains under manual

control.

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IBM Car Amplifier 7220 Manuel d'utilisateur Page 48