Tektronix 11A34 User Reference Supplement page 17

I
1 IA.?4 User's Reference Supplement
aberration following the tzansition. By setting the llA34 offset to 4.8 V and
the sensitivity to 1 mV/division, aberrations of just 0.1% of the ori@nal
divisions at 1 mV/division).
the came3 value). The IlAWsability to settlequickly to within9
fraction of its equilibrium value is exceptional. The time it takes
settle to within a stated fraction of the equilibrium value is its overdrive
Measuring the overdrive recovery time of an llA34 takes ~rne care and can
lead to some surprising results. An interesting experiment is to use a very flat
generator's fast-r&output to the llA3l input througha short (one foot or less)
coaxial cable and sel& 5m input impedance. Adjust the pulse amplitude to 1
volt Set the 1lAZ-l sensitivity to 1 mV/division. Each division now represents
0.1% of the input signal. Trigger the osdlloscope
the llA34 using 50 ns/division sweep rate. Now iraeaee the cable length by
about three feet (for example, use a 424nch length of RG58 cable, Tektronix
part 012435701) and observe the new waveform. See Figure Z-2.
Figure 2-Z Ovesdrive recovery using long (top) and short (bottom) cables
terminated in 5on Traces are offset two divisions and the photograph is a
double exuosrue.
and observe the recovery of