Setting Transition Modes - HP 8112A Operating, Programming And Servicing Manual

Setting Transition
Modes
Fixed m
Linear I/l
Gaussian
4-10 Operating
Figure 4-7. Transition Controls
The transition mode keys enable the operator to select the type of
pulse transition and to vary transition time.
a
This key provides
LEE or TRE parameters when this key is operated (lit).
Permits both the leading and trailing edges of the HP 8112A output
pulse to be programmed independently of each other, in the range
6.5 ns to 95 ms, by setting values for LEE and TRE. Maximum
permissible ratio is 1:20.
This key is the same as the linear mode key except that edges are
co-sinusoidal in shape. It is important to note that the actual rise
and fall times of the transitions will be up to 25% faster than the
selected and displayed value for slopes of greater than 50 ns duration.
For slopes less than 50 ns, transition times tend increasingly towards
the displayed value.
The reason for this variation is that selected values are based only
upon times between 10% and 90% of total trigonometric transition.
Values between 0 to 10% and 90% to 100% are not taken into
account by the HP 8112A instrument.
fixed transition of 4.5 ns. You cannot adjust the