HP 3326A Operating And Reference Manual page 13

Turn on and Warm up
more than 24 hours, up to 72 hours of operation may be required to meet frequency
specifications. The HP 3326A with Option 001 requires 30 minutes of operation to meet
other specifications.
NOTE
When power is removed from the HP 3326A with
the POWER key, the
HP 3326A is in a standby con-
dition. In the standby condition, power is applied
to the high stability frequency reference circuits
(Option 00 1 ) to maintain frequency accuracy.
The Preset State and the lnstr Preset Key
INSTR
PRESET
The preset state of the HP 3326A is listed in Figure 1-1. The HP 3326A is restored to
the preset state by pressing the green INSTR PRESET (INSTRument PRESET) key. INSTR
PRESET provides a convenient starting state for establishing an instrument setup. INSTR
PRESET does not destroy instrument states or discrete frequency sweep elements stored
in the internal nonvolatile memory.
HP-IB Example:
"RST"