1250 Frequency Response Analyzer Options
AMK/1250/2 15-7
SYNC SOFT KEY:
SELECT AND
ENTER:
RATIO NUMBER
ENTERED:
HARMONIC
SELECTED:
RESULTING
SYNCHRONISER
MODE:
[off] X X off
[loose] 0 1 loose
lock
[tight] 0 1 tight
lock
[loose] or **
[tight]
>0* 2 to 16* ratio
Fig. 15.4 - Interaction of RATIO, SYNC and HARMONIC Controls
Notes re Fig. 15.4
X = "don't care"
** In the Ratio and Harmonic modes, the terms "loose" and "tight" have no meaning
other than that of indicating the "on" condition.
* Ratio ≠ 0 and/or Harmonic ≠1. When using the Synchroniser, if a Harmonic number
other than "1" is entered in the Analyzer Menu, the 1250 will automatically select the
Ratio mode. The Harmonic number is then treated as the ratio by which the input
frequency is multiplied before being used to synchronise the Analyzers.
If numbers are entered for both Ratio and Harmonic, the 1250 will use the product of the
numbers: e.g. enter 3 in Ratio and 3 in Harmonic, and the 1250 will measure the
response at the 9th Harmonic. Entries under Harmonic do not affect the Synchroniser
Status Display.
Note that BREAK, CHECK, TEST, RESET and Power-Up reset all turn the Synchroniser
off.
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