3M 2220M 用户手册
512 Hz – Sonde.frequency.indicated.by.
sonde.icon.
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.
sonde.icon.
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.
640 Hz - Sonde.frequency.indicated.by.
sonde.icon.
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.
sonde.icon.
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.
33 kHz - Sonde.frequency.indicated.by.
sonde.icon.
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.
sonde.icon.
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.
Radio or LF - Low.Frequency.Band:.
15.Khz–30.kHz
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.
15.Khz–30.kHz
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.
CATV – 31.5.kHz
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.
Press.the.down.key.to.enable/disable.
the.frequency..A.check.mark.will.
appear.in.the.box.when.the.frequency.is.
enabled.