The Gould 400 series instruments are Digital Storage
Oscilloscopes (DSOs). They include all the features
expected of advanced modern oscilloscopes designed for
the professional engineer, whilst retaining the
user-friendliness essential for those learning to
use such instruments for the first time.
The 400 range consists of three basic models; the 400
the 420 and the 450. All versions can be fitted with a
battery unit which provides the instrument with a fully
automatic built in Nickel Cadmium battery and charger
which allows uninterrupted operation of the DSO in the
event of an AC supply failure and complete operation
independent of an AC supply.
Obtaining a trace is especially simple - just connect the
signal and press the Auto Setup button - the 400 does the
rest. Having obtained a trace, readily accessible
datum lines and a cursor make it easy to take automatic
timing and voltage measurements directly from the display.
On the 420 and 450 models, the waveform processing function
increases the power of the cursor measurements in
terms of both capture and post storage analysis and
The innovative use of ergonomically designed pressure
sensitive push button controls provides a combination
of precision and flexibility for ease of operation.
More advanced features of the 400 series include a
comprehensive range of menu-controlled functions. For
example, the Display and Trigger menu operates features
such as the trigger delay and pretrigger display
functions. The pretrigger display function allows
the signal prior to the trigger point to be captured
Three complete traces can be stored for future use
and recalled to the display via the Save Trace and
Recall Trace menus respectively. With the built in
battery back up facility, these will be retained even
when the instrument is switched off.
In addition to the above features, the 420 and 450
instruments have a built in 4 colour plotter and a
battery backed Real Time Clock. This provides a simple
and convenient method of obtaining permanent hard
copy plots of the screen display. The plots will contain
the date and time of acquisition together with the date
and time of plotting.
The 450 has all the features of the 420 and has a
signal bandwidth of 50MHz and an extra timebase
range of 50ns/div
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