Ametek 7270 Instruction Manual page 113

Figure 5-48, Dual Reference Channel Menu 1
The Dual Reference Channel Menu 1 has four controls affecting the instrument's
reference channel, and a key to access Dual Reference Channel Menu 2. Changes to
the setting of these controls can be made by using the adjacent
REF1 SOURCE and REF2 SOURCE
These two controls allow selection of the source of reference signal used to drive the
reference 1 and reference 2 channels respectively. The controls interact so that if, for
example, the REF 1 source is set to INT (internal mode) the REF2 selections will be
either EXT-fp or EXT-rp (external mode with front panel or rear panel reference
input respectively). The available settings are therefore:-
INT
In this setting the relevant reference channel operates at the internal oscillator
frequency.
EXT-rp
In this setting the relevant reference channel is configured to accept a suitable
external reference source applied to the instrument rear panel TTL REF IN
input connector. The maximum frequency for this input in dual reference mode
with two external references is 3 kHz
EXT-fp
In this setting the relevant reference channel is configured to accept a suitable
external reference source applied to the instrument front panel REF IN input
connector
REF1 PHASE and REF2 PHASE
These two controls allow the reference phase of reference
independently adjusted over the range -180° to +180° in 10m° steps. Adjustment is
faster using the Keypad or Active Cursor controls - see section 4.1.04.
Dual Ref Chan Menu 2
Pressing a key adjacent to this item access the Dual Reference Channel Menu 2, and
Pressing the Previous Menu key returns control to Main Menu 1.
Chapter 5, FRONT PANEL OPERATION
and reference
1
keys.
to be
2
5-65