1250 Frequency Response Analyzer Making Measurements: The Generator
AMK / 1250 / 4 4-5
4.4 STARTING THE GENERATOR
4.4.1 GENERATOR START KEY
As a general rule, when setting up a new measurement after initialisation, the Generator
should be the last item in the sequence to be started. The GENERATOR START key
thus becomes the Measurement Start control. By this means, all output devices such as
plotter, printer and computer can be enabled in advance; any scaling etc. can be set up
and sweep details entered. All these facilities are then held waiting, so that when the
Generator is finally started, everything begins at the same time, and no readings are
lost.
Bearing this in mind, the Generator can, in fact, be started at any time, by simply
pressing GENERATOR START. For simple measurements, it does not usually matter
which is `started` first, the Generator or the Analyzer, but both must be running for
readings to be taken.
4.4.2 GENERATOR WAVEFORM STARTING POINT
For most applications of single sinewave measuring techniques, the Generator
waveform starting point is not critical. The power-up reset that occurs when the 1250 is
switched on, and the initialising routine both ensure that the Generator waveform
commences at 0° the next time that START is pressed.
However, if the Generator has been left halted as the result of a 'stop' command of any
kind, the waveform may not start again from 0°. See Section 5 'Stopping the Generator'
for details.
4.5 STOPPING THE GENERATOR
4.5.1 INTRODUCTION
Apart from using a remote controller, the Generator can be stopped by:
1. Pressing GENERATOR STOP.
2. Connecting the HI and LO GENERATOR STOP INPUT sockets on the rear panel
to each other; or connecting the HI socket to 0V.
3. Using the STOP @ key, as explained in Section 5.3.
If methods 1 or 2 are used, the Generator waveform will remain at the level reached
when the command was actioned. If not initialised, or switched off then on again in the
interim, the next START command will cause the waveform to continue from wherever it
had stopped.
4.5.2 GENERATOR STOP KEY
Because of its immediate action, the GENERATOR STOP key can be used as a 'Panic
Switch' to stop the measurement if things seem to be getting out of control!
If it is essential to know the exact start point, and re-setting in any form is inconvenient,
use the STOP @ key, as explained in Section 5.3.
There is no need to stop the Generator before changing the settings of frequency,
amplitude etc.
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