Output Filters Menu - Ametek 7270 Instruction Manual

AUTO PHASE
In an Auto-Phase operation the value of the signal phase with respect to the reference
is computed and an appropriate phase-shift is then introduced into the reference
channel so as to bring the difference between them to zero. The intended result is to
null the output of the Y channel while maximizing the output of the X channel.
Pressing the Previous Menu key returns control to Main Menu 1.

5.3.06 Output Filters Menu

When Main Menu 1 is displayed, pressing a key adjacent to the Output Filters item
accesses the Output Filters menu, which is shown in figure 5-9.
The Output Filters menu has four controls affecting the instrument's main X and Y
channel output filters. Changes to the setting of these controls can be made by using
the adjacent
TIME CONSTANT
This control, which duplicates the Main Display TIME CONSTANT control, is used to
set the time constant of the output filters.
SLOPE
The roll-off of the output filters is set, using this control, to any value from 6 dB to
24 dB/octave, in 6 dB steps. Note that there are some restrictions in that it is not
possible to select 18 or 24 dB/octave settings at Time Constants of 500 ms or shorter
when using the fast time constant mode..
SYNC TIME CONSTANT
This control has three settings, as follows:-
OFF
In this setting, which is the normal mode, time constants are not related to the
reference frequency period.
ON
In this setting, the actual time constant used is chosen to be some multiple of the
reference frequency period, giving a much more stable output at reference
frequencies below 10 Hz for the Normal time constant mode (below 1 kHz for
Chapter 5, FRONT PANEL OPERATION
Figure 5-9, Output Filters Menu
keys.
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