Performance Characteristics
3-4 Force FX-8C Service Manual
Alarm Tone
REM Contact Quality Monitor
REM current is measured according to IEC 601-1, Ed. 1988, Figure 15.
Acceptable Resistance Range
REM resistance measurements are ± 10% during RF activation and ± 5%
when RF output is not activated.
REM patient return electrode: 5 to 135 ohms or up to a 40% increase in the
initial measured contact resistance (whichever is less).
Patient return electrode without the REM safety feature (single section
electrode): 0 to 20 ohms.
If the measured resistance is outside the acceptable range(s) noted above,
a REM fault condition occurs.
REM Alarm Activation
REM patient return electrode: When the measured resistance exceeds the
standard range of safe resistance (below 5 ohms or above 135 ohms) or
when the initial measured contact resistance increases by 40% (whichever
is less), the REM Alarm indicator flashes red, a tone sounds twice, and RF
output is disabled. The indicator remains illuminated red until you correct
the condition causing the alarm. Then, the indicator illuminates green and
RF output is enabled.
Patient return electrode without the REM safety feature: When the measured
resistance between the patient return electrode pins exceeds 20 ohms, the
REM Alarm indicator flashes red, a tone sounds twice, and RF output is
disabled. The indicator remains illuminated red until you correct the
condition causing the alarm. Then, the red indicator is extinguished and
RF output is enabled.
Volume (not adjustable) ≥ 65 dB
Frequency 660 Hz
Duration 250 to 500 ms
Measurement frequency 80 kHz ± 10 kHz
Measurement current < 10 µA
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