ZES ZIMMER LMG450, Руководство пользователя

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System design LMG450
266
14.1.1.4 Function of the signals
Frequency in
Maximum 500kHz frequency synchronous to the frequency of the measured signal. If the LMG
is set to Ext. Sync. this frequency is used for synchronisation. The rising edge of this signal
replaces the positive zero crossing of the usual sync detector.
Frequency out
Measured frequency of group A, depending on the synchronisation source of the group.
Control in
Control of the energy measurement. With the next high low transition the integration is reset
(if summing mode is inactive) and started. The integration stops only at transitions from low to
high. The functionality of the transitions:
high
→
low start key
low
→
high stop key
Control out
Status of the energy measurement high level if the integration is stopped, low level if the
integration is running.
Cycle in
Control of the measurement cycle. The period must be longer than 50ms and shorter than 60
seconds and longer than the period of the measured signal. The pulse duty factor can be 50%.
Example: To measure a 5Hz signal the measurement cycle must be bigger than 200ms.
Attention: Use only with valid control periods otherwise there can be a system fault of the
meters. This input is normally not used.
The rising edge of this signal finishes one cycle and starts a new one.
Cycle out
Pulse for about 10
µ
s per measurement cycle.
Trigger in/out
not used.