User's Manual

PL-550 30
OPERATION
LOSS OF ECHO
A loss of echo occurs when the IQ Radar 160 deems that the calculated
measurement is unreliable, i.e. the confidence (P805) is less than the threshold
(P804). This can be due to such circumstances as high level of electrical noise or
poor grounding. Refer to Troubleshooting. If the condition persists for a time
beyond the limit as set by the fail-safe timer (P070), the confidence icon changes
from full to partial and the reading and mA output are immediately forced to the
fail-safe default (P071).
Upon receiving a reliable echo, the loss of echo condition is aborted (icon returns
to full) and the reading and mA output return to the present level immediately.