Marconi Instruments 2040 - Display Blanking; Power up Options; RF Level Units

Press [Unlock Level
1]
and
the
message
Enter 4 Digit Password: will appear on
the
display. Level 1 is unlocked by entering the 4 digits on the key
pad and pressing [enter]. The
menu
will
change and
two soft keys, [
Lock
Level
1]
and [Lock Keyboard
J,
will appear on the
left-hand side. The default
password
is 1234. If this
password is not recognised by the
instrument, the password has been changed by your
calibration/repair department personnel who
should be consulted for
further information.
[Unlock
Level
2]
is only used
during servicing.
Refer
to the Service Manual for details.
Keyboard locking
Unlock to
Level
1,
see 'Selection Menu
2'
and
'Locking and Unlocking' above. Keyboard
operation is disabled by
pressing [Lock Keyboard]. The instrument
automatically returns
to
the
main menu which indicates the locked status by
displaying a key-shaped icon in the top left-hand
comer
of
the
display. The keyboard can be re-enabled by entering
the 4 digit password for Level
1 using the keypad and
pressing [enter]. The keyboard status is saved in the
non-volatile
memory.
Display blanking
To prevent
sensitive data from being displayed, the 2040 series Signal
Generators
include
a display blanking facility.
This
allows various parts of
the display to be replaced by a series of
dashes so that
values entered
by
the user or recalled from the memory
will
not be
visible. The
instrument must be unlocked to Level
2
to
enable or disable this facility. Consult the Service
Manual
for further
information.
Power up options
Unlock to
Level
1,
see
'Selection
Menu
2'
and 'Locking and unlocking’
above. Two
options
are available
by
pressing [Power Up Options
]
at
Utilities Selection Menu 2. These
options are [Factory] and
[Memory]. When [
Factory
]
is
pressed, the factory set
power
up state is
recalled. Pressing [Memory] causes [Memory Number] to
appear
at
the right-hand side of the
menu. To change the
power
up
state of the instrument
to
a particular setting,
enter
the
memory
number of the full store on the key pad and press [enter].
RF level units
RF output
level
units can be altered using the [Level
Units] key. The
level
units may be
entered as an
EMF or PD, and the logarithmic units can be referred to
volts (dBV), millivolts
(dBmV),
microvolts (dBpV)
or to 1
milliwatt
into 50
Q(dBm). Select the units by pressing
[Level Units]
which displays the RF Level Units Selection Menu shown in Fig.
3-1-31.
To change
the default RF level units shown at switch on, first
unlock the instrument
to
Level 1. This causes an additional
soft key
to be
displayed in the top left box (see Fig.
3-1-31).
Select
the required RF level units and press the additional [Save
RF Units] key
to
save these
as
the default units.
3-1-40
46882-074C