User`s guide

53220A/53230A User’s Guide 19
Preparation for Use 1
Power-On LED Status
The led located under the on/standby button is an indication of the
on/off/standby condition of the instrument. The different conditions are
summarized in the table below. The ‘off’ status is determined by the presence
of OXCO Option 010.
Table 1-2. Power-On LED Status and Color.
Standby Power
The power modes of the 53220A/53230A counter are ‘on’ ‘off’, and ‘standby’.
In standby mode with the instrument connected to line voltage, standby power
is supplied to maintain the temperature within the ultra high-stability oven
controlled crystal oscillator (Option 010).
Battery Option 300 itself supplies standby power for the OCXO when the
53220A/53230A is not connected to line voltage.
Refer to “Standby Power to the Reference Oscillator” in Chapter 3 for
information on enabling/disabling standby power.
NOTE
If the 53220A/53230A does not turn on when the on/standby button is pressed,
verify AC power is available to the instrument and that the power cord is securely
connected. If the instrument still does not turn on, the cooling fan is not audible,
or if the front panel display is off when power is applied, return the unit to Agilent
for repair.
Instrument ’Off’
Power Source
Instrument
‘On’
OCXO w/
Standby
enabled
OCXO w/
Standby
disabled
No
OCXO
AC Line green amber off off
Opt. 300 Battery
(enabled)
green amber
(blinking)
off off
Opt. 300 Battery
(disabled)
off off off off