SME Status-Reporting-System
1038.6002.02 3.144 E-13
Call-up and termination of operating mode
After a RESTORE, the database does no longer reflect the device setting which means
- the displayed values are no longer relevant,
- the desired result is not obtained by a query of setup values.
- normal setting commands may not be executed properly (see below ’Alternative ...)
It is therefore recommended either
- to use the *RST command or
- to store the device setting prior to using the first RESTORE command by means of the
:SYSTem:SSAVe n command and to restore it after the last RESTORE command using
:SYSTEM:SRESTore n. The database and the device setting will then match again.
No other commands are required to activate or deactivate this mode.
Note: - Since the module setting depends on the temperature of the unit, any temperature variation
of more than 5°C should be avoided between storage and call-up to ensure the accuracy of
the unit.
- If the mechanically switched attenuator is switched over due to a RESTORE command, the
setting time increases by 15 ms. This can be avoided by setting one of the two functions for
interruption-free level setting (:OUTPut:AMODe FIXed) prior to storing the setting.
Effects on device settings:
The Fast Restore commands have an effect on almost all device settings (see table).
Device settings stored and called up by Fast
Restore:
Device settings not stored or called up by Fast
Restore:
•
Frequency incl. reference oscillator
•
Level - incl. mech. switched attenuator,
- incl. user correction,
- incl. ALC modes
•
Analog modulation: AM, FM, PM
•
Switch-on/off of digital modulation
•
Standard LF generator (4 fixed frequencies)
•
Settings of digital modulation
•
Functions not regarding the RF output signal,
eg commands under :SYSTem:... (except for
SYSTem:PRESet) or
:UNIT:...
•
Sweep
•
List mode
•
Memory sequence
•
Options LF generator (SM-B2) and
multifunction generator (SM-B6) incl.
LF output stereo and VOR/ILS modulation
•
Pulse modulation and pulse generator
Alternative use with other IEC/IEEE-bus commands:
The alternative use of the RESTORE commands (’:SYSTem:SREStore’ or ’!..’) and normal IEC/IEEE-
bus commands is
•
useful in case of digital modulation:
First, the digital modulation is configured and switched on by means of normal commands. Then,
digital modulation can be switched on/off by means of the RESTORE .
• possible for all commands that do not regard the RF output signal (eg :SYSTem:..., :UNIT:...),
• normally not possible for all the functions listed in the left column of the above table.
In case of doubt, we recommend testing.
Synchronization signal
In the Fast Restore mode a synchronization signal is available at the rear-panel BLANK connector to
synchronize other devices.
The BLANK signal is high during settling of the RF output signal and low in the settled state.
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