Arm-Ing The Data Acquisition; Fig. 4.10.1. - Arm Control Elements - ETC M570 series User Manual

M570 series oscilloscope with rollmode
- "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.
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 defines the ARM condition for the "E" input. If it is set to "0" the data
acquisition will be interrupted if the "E" input is connected to log. 1. If it is set to 1,
log.0 interrupts the data acquisition.
If there are several ARM inputs set to active state, every active condition must
be met to allow data acquisition.
TIP: Internal 10 kOhm pull-up resistor is connected between "E" input and 3.3V
power supply of the oscilloscope. This sets log.1 to unconnected input. This
condition can be used for simple data acquisition control. If only the E arming
condition is active and set to 1, grounding the "E" input interrupts the data
acquisition. If the condition is set to 0, grounding the "E" input starts the data
acquisition.
The "ARM" indicator changes its color under following conditions:
Fig. 4.10.1. – ARM control elements
User's Guide
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