Fluke 281 User Manual page 257

Pressing next on any screen calls the next set-up screen, finally returning the display
to the STANDARD WAVEFORMS screen from which pulse-train can be turned on and
off. Pressing done returns the display directly to the STANDARD WAVEFORMS
screen from any set up screen. The pulse-train is built only after next is pressed after
the last parameter set-up or whenever done is pressed, assuming a change has been
made. The first screen, shown above, sets the number of pulses (1 to 10) in the pattern;
enter the number of pulses directly from the keyboard or by using the rotary control.
Pressing next calls the pulse train period screen:
The third line of the screen indicates how the waveform will be constructed; in this case it
will be 10000 points played back at a clock period of 10.000000ns to give a period of
10000x10 -9 = 100µs. These values will change as the period is varied. The clock period
will determine the resolution available for setting the delay and width as discussed below.
The period can be set, with 8 digit resolution, from 10·000000 ns to 100 s by direct
keyboard entries or by using the rotary control.
Pressing next calls the baseline voltage screen, the last of the general set-up screens:
The baseline is the signal level between the end of one pulse and the start of the next, i.e.
it is the level at which all pulses start and finish. The baseline can be set between -5·0V
and +5·0V by direct keyboard entries or by using the rotary control. Note that the actual
baseline level at the output will only be as set in this field if the output amplitude is set to
maximum (10 V p-p into 50 Ω) on the AMPLITUDE screen and terminated in 50 Ω. If
the amplitude were set, for example, to 5 V p-p into 50 Ω then the actual baseline range
would be -2·5 to +2·5 V for set values of -5·0 to +5·0 V, i.e. the amplitude control scales
the baseline setting. The actual output levels are doubled when the output is not
terminated.
Pressing next on this screen calls the first of the three screens which define the first
pulse in the train:
pulse train period:
100.00000us
10000pt*10.000000ns
done next
Enter the baseline
voltage:
+0·000 V
done next
Pulse 1 level
+5·000 V
done next
Pulse and Pulse-trains
Pulse-Train Set-Up
10
10-5