Dataman 520 Series - Manual (Page 18)

DATAMAN 520 series oscilloscope with rollmode
User’s Guide
Fig. 4.9.1. – Trigger controls
The first row of the control elements represent Channel A, the second one channel B
trigger condition settings. The left button (“A” and/or “B”) activates the trigger
condition for Channel A, or Channel B. The buttons located in the middle column set
the relations to value written in edit boxes located at the right side of the group. The
value written to these boxes represents voltage in volts or milivolts (m).
The button located in the bottom row of the group becomes active if both trigger
conditions for Channel A and Channel B are activated. It defines the influence of each
of the channels on the trigger event. It can be set to one of the following states:
- “AND” the data acquisition starts if both conditions are met
- “OR” the data acquisition starts if any condition is met.
The “TGD” indicator changes its color under the following conditions:
- it is red if the trigger condition did not occurred yet
- it is green if the trigger condition has already occurred.
WARNING: ARM-ing circuitry (see chapter 4.10.) have higher priority than the
triggering circuits. If the triggering circuits are set to the conditions under which
the data acquisition is blocked (by ARM-ing circuitry), the acquisition will never
start.
4.10. ARM-ing the data acquisition
Located in the bottom right side of the main window, these control elements allow to
set conditions under which the data acquisition is interrupted. The reason of
interruption can be the voltage measured by each channel and/or logic level on the
“E” input of the instrument.
Fig. 4.10.1. – ARM control elements
The first and second row of the control elements represents the Channel A and
Channel B ARM condition settings. The left button (“A” and/or “B”) activates the
ARM conditions for Channel A or Channel B. The buttons located in the middle set
the relations to value written in edit boxes located at the right side of the group. The
value written to these boxes represents voltage in volts, or milivolts (m). If the
condition set is FALSE the data acquisition is interrupted. It starts again when all
active conditions are met.
There are two buttons in the bottom row. When the “E” button is active the data
acquisition is controlled also by the “E” input of the device. This input is LVCMOS
3.3V compatible with threshold of about 1.5V. The button located on the right side
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