General Information 1250 Frequency Response Analyzer
1-6 CWB / 1250_Op / Issue 9
Keyboard. The keyboard on the front panel uses membrane switches and consists of a
number of function keys, used in conjunction with a numeric keypad. (See Fig. 1.7).
The function keys are known as `hard` keys in order to distinguish them from the five
keys immediately below the display which are called `soft` keys. Each hard key is
dedicated to one specific task, whereas the soft keys have many different roles assigned
to them, according to which hard key has just been operated. These roles are identified
by titles which appear in the display immediately above the relevant soft key.
For example, the major programmable sections of the 1250 are each controlled by a
menu. If the GENERATOR MENU key is pressed, the lower half of the display will
assign titles to the five soft keys as shown in Fig. 1.6:
Figure 1.6 - Softkey titles
Display. The display is a vacuum fluorescent alpha numeric type, each character being
formed on a 7 x 5 dot matrix. There are two rows of forty characters each.
Keyswitch. The keyswitch on the rear panel of the 1250 enables/disables writing to the
permanent memory, when switched to Supervisor/Normal respectively. The keyswitch
is a three position switch, with the Operator position reserved for future use.
GPIB Interface. Permits any device conforming to IEEE 488 (1978) to be connected,
e.g., a digital plotter to display results or a computer to process them.
Serial Interface. Enables most EIA RS232C and RS423 compatible peripherals to be
connected.
Control and Computation. This section controls the functioning of the whole
instrument and computes the results of the measurements. All the functions are under
microprocessor control and the entire instrument is run synchronously to preserve the
highest possible accuracy and repeatability of results. There are stores to hold previous
readings, parameter settings, and a number of learnt programs.
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