GENERAL INFORMATION
1-4
Memory sequencing
A software facility allows sequences of stored instrument settings to be defined. The incrementing
facilities can then be used to cycle through the settings in manually operated test systems or be
operated via an external trigger.
Memory protection
To prevent accidental change of the contents of the stored settings, individual memories or ranges
of memories can be write-protected.
Programming
A GPIB interface is fitted so that all functions are controllable via the interface bus which is
designed to IEEE Standard 488.2. The instrument can function both as talker and listener. The
instrument also has an RS-232 interface which uses the common GPIB command set. The
interfaces enable the instrument to be remotely controlled as well as being used to transfer settings
(cloning) from one instrument to another.
Calibration data
All alignment data is digitally derived. Realignment can be undertaken, without removing covers,
by protected front-panel functions or via the GPIB interface.
Internal pulse generator (Option 9)
This option provides the instrument with a configurable pulse generator that can be used to drive
the internal modulator, and to provide pulses to external equipment. Pulse period, width and delay
are all adjustable, and the pulse generator can free run or be externally triggered.
SINAD measurement (Option 12)
The instrument measures the SINAD ratio (the ratio of signal + noise + distortion to noise +
distortion) using an internal 1 kHz notch filter. A choice of unweighted, C-MESS or CCITT filters
is available and the amount of averaging is selectable. The measurement can be made with the
instrument in manual or auto level-seeking modes.
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