Fault description Cause Remedy
The LED in the base of the
device does not light up/
flash (ChronoMaster Air
only)
The rechargeable bat-
teries are not charged.
• Ensure that the rechargeable batteries
have been charged.
• Connect the device to a power supply
using the USB cable.
• Move the slide switch from “ON” to “OFF”
and back to “ON”.
The device is not listed in
the selection list for
channel assignment.
The device is not con-
nected to the PC or
tablet computer cor-
rectly.
• Move the slide switch from “ON” to “OFF”
and back to “ON”.
• Close the selection window for channel
assignment, and open it again.
• Ensure that the device is connected to the
right PC or tablet computer.
The Bluetooth connection
is interrupted (Chrono-
Master Air only)
Unstable Bluetooth
connection.
• Place the ChronoMaster Air closer to the
PC or tablet computer.
• Use the external Bluetooth dongle “Laird”
(item no. JB15-BT851) for a more stable
connection.
The capacity of the
rechargeable batteries is
not displayed correctly
(ChronoMaster Air only)
The charge status dis-
play was not calibrated
after replacing the
rechargeable batteries.
Recalibrating the charge status display
(
Ä
“Recalibrating the charge status display”
on page 38).
24.03.2021 Precision measuring device ChronoMaster / ChronoMaster Air 41
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