1250 Frequency Response Analyzer Options
AMK/1250/2 15-9
15.1.8 SYNCHRONISER STATUS
The Synchroniser Status Display messages are shown in Chapter 11, Section 1.4. The
first page of these messages is also available as the Mini Status Display, Chapter 7,
Section 4. Status information is available externally by using the Commands given in
Chapter 13, Section 7.4.
Status Display Page 1, and Mini Status
The state of the Synchroniser at any given moment is defined by one of the six
messages listed below:
Message Meaning
NONE No Synchroniser fitted. This message can appear even when SYNC is
switched off.
IDLE The Synchroniser is fitted but has not yet received at least the first two input
trigger pulses. Hence the input trigger frequency cannot be measured.
WAIT At least two input trigger pulses have been received, thus enabling the input
frequency to be measured.
If an attempt is made to establish a LOCKED condition before the WAIT
state has been achieved, for example on very low trigger frequencies,
ERROR 94 will be flagged.
STABLE At least two frequency readings have been taken and compared, and the
times between consecutive pairs of trigger pulses have been found to be
identical; i.e. the input frequency is stable.
LOCKED Lock has been achieved, and the 1250's Analyzers will now measure at the
correct frequency.
FAULT The Synchroniser cannot achieve, or retain, the LOCKED stated. When
Page 1 of the Status Display shows FAULT, this will be followed by one of
the numbers defined below:
1. Frequency Overflow, i.e. the input trigger frequency exceeds 65535Hz.
2. Time Overflow, i.e. the time interval between consecutive trigger pulses
exceeds 2
40
µs (≅ 12.5 days!).
3. Event Overflow. This fault number indicates that an irrational occurrence
has been detected. The user should try again, but if the fault persists,
there is probably a hardware fault.
4. Lock Lost. This fault indicates that the input trigger frequency has
become unstable.
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