Output Filters Menu - Ametek 7124 Instruction Manual

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 two 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 low frequencies
than would otherwise be the case. Note that, depending on the reference
frequency, output time constants shorter than 100 ms cannot be used.
TIME CONSTANT MODE
This control has two settings, as follows:-
NORMAL
In this setting, the analog outputs are derived from the output processor. The
update rate is always 1 kHz, the output filter time constant can be set to values
between 5 ms and 100 ks in a 1-2-5 sequence, and all four output filter slope
Chapter 5, FRONT PANEL OPERATION
Figure 5-9, Output Filters Menu
keys.
5-13