Changing The Vertical Sensitivity (Volts/Div); Using The Variable Volts/Div Control - Tektronix 7D20 Operator's Manual

CHANGING THE VERTICAL SENSITIVITY (VOLTS/DIV)
Initialization sets the vertical sensitivity to 1 volt/div as indicated in the display
readout . The VOLTS/DIV control allows you to select the vertical sensitivity of the
7D20 in volts per division . Slowly rotate the VOLTS/DIV control and observe
the
effect this has on the displayed waveform . Notice too that each change is indicated
in the top line of the display readout . As the VOLTS/DIV control is rotated in the
counterclockwise direction the Vertical sensitivity can be decreased to a minimum
of 5 V/div . Rotation of the control in a clockwise direction increases the
vertical
sensitivity, in a 1, 2, 5 sequence to a maximum of 5 mV/div . Rotating the
VOLTS/DIV control beyond either the minimum or maximum setting will have no
further effect on the vertical sensitivity or the displayed sensitivity setting . Return
the vertical sensitivity to 1 volt/division .
USING THE VARIABLE VOLTS/DIV CONTROL
This control allows you to decrease the vertical sensitivity from its current setting .
Rotate the knob counterclockwise (out of its calibrated detent position) and notice
that a > sign appears in the display readout next to the VOLTS/DIV setting as
shown in Figure 2-14 . This indicates that the vertical attenuation is now
uncalibrated and is greater than the displayed VOLTS/DIV setting . Observe that the
vertical sensitivity continues to decrease as you rotate the VARIABLE VOLTS/DIV
control and notice the effect this has on the displayed waveform . Return the control
(by rotating clockwise) to its detent position and note that the > symbol disappears
from the display .
VARIABLE
VOLTS/DIV
INDICATION
m i~ .
osu ~
rPOS e
CSW~ 1 - ; .
~ . . , .
-1 .8 VZR k .2
i i
;V .~1 .9~V. _. .
T ._g0 ..0H8
Figure 2- 14. VARIABLE VOLTS/DIV readout.
Operating Instructions-7D20
3857-24