Option 23/90 for CNT-90 &
CNT-90XL only
Power up the instrument with the power
The power supply status indicator next to
the left of the charging level indicator in
the upper right corner of the display shall
now show a battery symbol. It indicates
that the internal battery is the active power
source.
Press USER OPT
Misc, and select Use
Battery in Standby Yes
to make sure the
instrument will continue to operate in case
line power fails.
—
If the charging level is above 60 %, let the
instrument be running until the level goes
below 60 %.
Connect the power cord to the mains.
The status indicator shall now change to a
charging battery symbol.
Let the battery charge for at least 8.5 h in
normal operational mode.
When the specified charging time has
elapsed, the level indicator shall show a
value close to 100 %.
Disconnect the power cord and wait 10 s,
then reconnect the power cord.
The status indicator shall now show a
power plug symbol on top of the battery
symbol. This means that the power line
takes priority but will be replaced by the
battery if the mains voltage drops out.
Note: Charging will not be resumed until the
level goes below about 70 % in order to
cycle the battery more efficiently.
Recall the default settings by pressing
USER OPT
Save/Recall
Recall Setup
Default.
Connect 10 MHz OUT on the rear panel to
Input A, and select Freq A.
Check that the instrument is working and
shows a value close to 10 MHz.
Disconnect the power cord, and check that
the instrument goes on working.
Note: The power plug symbol disappears, leav-
ing the battery symbol alone.
Check that the instrument operates >4.5 h
without connection to the mains.
Power down the instrument by pressing
the green power switch key.
Check that the red standby LED lights up.
Power up the instrument again, and check
that it powers down automatically when the
Connect the power cord, and power up the
instrument.
Check that the standby LED goes out.
Check that the status indicator shows a
Let the battery charge to its full capacity.
Power down, wait 10s, and power up
Press USER OPT Misc, and select
Use Battery in Standby No to make
sure the instrument will not continue to
operate in case line power fails.
Note: The battery symbol disappears, leaving
the power plug symbol alone.
Disconnect the power cord, and check that
the instrument stops working. The standby
LED shall not light up.
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020
7-21
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