Tektronix DTG5078, User Manual

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Timing Parameters
1-56
DTG5078 & DTG5274 & DTG5334 Data Timing Generator User Manual 2
Slew Rate
Slew Rate indicates the pulse responsiveness (rise and fall times) by showing the
variation in output voltage per nanosecond (V/ns). Larger the value, shorter the
pulse rise or fall times.
Figure 1-32: Slew Rate
For the Slew Rate setting, there are no differences that depend on the mainframe or
slot position. However, you can find slight differences in the settings or other
conditions, depending on the output module currently installed in the slot.
Table 1-16, “Slew Rate control” summarizes the differences.
„
You can change Slew Rate before output only for the DTGM10 and DTGM20
output module channels.
„
The slopes vary simultaneously by the same amount relative to both the rising
and falling edges.
„
The amplitude of the output signal may not reach the setting, depending on the
Slew Rate, pulse width, and/or amplitude settings.
„
Varying Slew Rate shifts the 50% amplitude position. When Slew Rate is at
the maximum level, Delay and Width are calculated at the 50% amplitude
position before being output. This produces a difference between the setting
and the value obtained from the actual output signal.
Table 1-16: Slew Rate control
DTGM10 DTGM20 DTGM30, DTGM31,
DTGM32
Range 0.65 V/ns to 1.30 V/ns
into 50
Ω
to GND
0.63 V/ns to 2.25 V/ns
into 50
Ω
to GND
fixed
Resolution 0.01 V/ns 0.01 V/ns
Slew Rate
Large Small
× ×
Δ
Δ