If a warning lamp or “o.r” is displayed
ERROR SYNC
See: "3.2.5 Setting the Frequency Measure-
ment Range (Zero-cross filter)" (p.50)
ERROR HRM
See: "3.4.4 About the HRM ERROR lamp"
(p.77)
PEAK OVER, o.r
See: "3.10 When warning lamp, o.r, or the
Unit Indicator Flashes" (p.112)