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HOW TO USE THE INSTRUMENT 4 - 65
DELAYED TIMEBASE TRACE SEP
The traces displayed by the Main Timebase and Delayed Timebase can be
separated with TRACE SEP.
If the DELAYED TIMEBASE menu is activated, you will see the symbol next
to the TRACE SEP text. The indicates that the TRACK control can be used to
adjust the trace separation.
- Turn the TRACK control and observe that the DTB trace shifts.
DELAYED TIMEBASE TRIGGER
Using the Delayed Timebase (Del’d) to select, capture, and display a small portion
of the Main Timebase display results in a magnification of the intensified part.
Depending on the ratio between the MainTB and Del’dTB settings, this
magnification can be very significant.
If the input signal contains jitter or any other form of timing instability, this jitter will
be magnified in the same ratio. This can be so much, that the display becomes
unusable. To address such a problem, the Delayed Timebase (Del’dTB) can be
made to trigger on the input signal after the delay time has passed
.
Start with the STANDARD SETUP.
- Connect the Probe Adjust signal to the
Channel 1 input.
- Simultaneously press the STATUS and
TEXT OFF keys.
- Switch channel 1 to AC coupling ( ).
- Shift the trace to the upper half of the screen.
- Press the Delayed Timebase (DTB) key to
enter the DELAYED TIMEBASE menu.
-
Turn on the Delayed Timebase.
T
T
ST6728
dtb
TRACK
DELAYED
TIME BASE
CH1
500mV
ch1
ST6717
DEL’D TB
onoff
MAINTB
onoff
starts
trig’d
TRACE
SEP
T
MTB 1ms
DTB 0.1ms >4.300ms
LEVEL
+0V
acdc
lf-rej
hf-rej
∆
ch1
1-