Output Filters Menu - Ametek 7280 Instruction Manual

Chapter 5, FRONT PANEL OPERATION

5.3.06 Output Filters Menu

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EXT-F
In this setting the reference channel is configured to accept a suitable external
reference source applied to the front panel REF IN input connector
REF HARMONIC
This control allows selection of the harmonic of the reference frequency at which the
lock-in amplifier will detect. It can be set to any value between 1st and 32nd, but
most commonly is set to 1st. Note that the "2F" setting commonly found on other
lock-in amplifiers corresponds to setting this control to 2nd. Adjustment is faster
using the Keypad or Active Cursor controls - see section 4.1.04.
REF PHASE
This control allows the reference phase to be adjusted over the range -180° to +180°
in 1 m° steps. Adjustment is faster using the Keypad or Active Cursor controls - see
section 4.1.04.
REF PHASE ±90°
This control allows the reference phase to be adjusted in steps of ±90°.
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.
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 5-8.
The Output Filters menu has three controls affecting the instrument's main X and Y
Figure 5-8, Output Filters Menu