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4 - 22 HOW TO USE THE INSTRUMENT
4.5 HORIZONTAL DEFLECTION AND TRIGGERING
Before starting with the horizontal deflection functions, you must set the
instrument to a predefined state to create a correct start situation.
STANDARD SETTING
- Simultaneously press the STATUS and TEXT OFF keys.
- Connect the Probe Adjust signal to channel 1.
The Probe Adjust signal, now supplied to the input, is a square wave with a lower
level of 0V and a top level of 600 mV.
-Press AUTOSET.
TIMEBASE TIME/DIV
4 periods/cycles of the square wave are displayed on the screen.
- Press the ’s’ (left) key of the MainTB TIME/DIV key pair a few times.
The more you press the left (’s’) key, the slower the timebase will run. This results
in the number of displayed periods/cycles of the input signal to increase.
- Press the ’ns’ (right) key of the MainTB TIME/DIV key pair a few times.
The number of displayed periods/cycles decreases as the timebase speed
increases.
Observe that the timebase speeds are adjustable in steps following a 1-2-5
sequence.
-
Set the timebase to 200
µ
s
.
The signal is displayed with four periods on the screen.
ST6839
TIME/DIV
ST6709
MTB 100µsMTB 500µs
TIME/DIV