User Manual

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4.6 Auto Range Function
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：Execute the Auto Range function.
：Cancel the Auto Range function.
Screen: DISPLAY
Method
Method
Press the DISP key to call up the DISPLAY screen.
Press the AUTO key.
Use the function keys to make the selection.
Conditions related to the input units（All Channel）:
Measurement range, Zero position: value Set automatically
Magnification/compression ratio along the voltage axis:
Magnification/compression ratio along the time axis:
Single screen: ×1
Other screen: ×1/2
Low-pass filter, Input coupling OFF, DC
Trigger conditions（For one channel only）:
AND/OR for internal trigger and external trigger OR
Trigger mode / Pre-trigger AUTO / 20%
Internal trigger. Only ON for the lowest numbered one of the channels for which
waveform display is on. OFF for the other channels. (However, only in
the case that the difference between the maximum and minimum
values is significant.)
Trigger type：Level Slope: （ ）(rising), Trigger level: value set automatically, Filter: OFF
Status conditions:
Time axis range (time/div): value set automatically, Memory segmentation: OFF
NOTE
4
.6 Auto Range Function
This function automatically selects the time axis range, measurement range
and zero position.
Taking the lowest numbered channel among the channels for which waveform
display is on, 1 to 2.5 cycles are automatically set to be recorded as 25 DIV.
■ If measurement has started using the auto-range function:
・Because the auto-range function performs automatic setting for the input
signal present at the time the function is executed, input a signal before
executing the function.
・If for the input signal for this channel there is only a small difference
between the maximum value and the minimum value in the range of
highest sensitivity (5 mV/DIV), the setting is made by taking the next
higher channel.
・If the range cannot be determined, for all channels for which the waveform
display is on. A warning message appears, and measurement is abandoned.
・When the auto range function is activated by pressing the AUTO key, a
trigger output signal is generated. This should be taken into consideration
when using both the trigger output and the auto range function.
・The auto-range function does not operate on channels for which the
CHARGE or PREAMP measurement mode is selected on the 8947 CHARGE
UNIT.