Tektronix 1780-R User Manual
Operating Instructions
3–26
1780R-Series Operator’s Manual
Overlay Operation
NOTE. Switch function is further described in Section 2.
Select the Overlay mode of operation by pushing the PARADE/
OVERLAY button, shown in Figure 3–11, until the Overlay LED
lights. Two pushes may be required, depending on the previous
condition.
OVERLAY button, shown in Figure 3–11, until the Overlay LED
lights. Two pushes may be required, depending on the previous
condition.
The instrument is forced to One Line operation. Two and Three Line
modes are locked out; a beep sounds if the switch is pushed. The
LINE/FIELD switch is still operational.
modes are locked out; a beep sounds if the switch is pushed. The
LINE/FIELD switch is still operational.
Overlaid Displays
The CH A/PROBE switch will select from the following input
channel combinations for overlaid display:
channel combinations for overlaid display:
CH A and CH B1
CH A and PROBE
CH B1 and PROBE
CH A and PROBE
CH B1 and PROBE
Subtract modes (A–B1 / B1–B2 / B1–B3 switch) are unavailable in
Overlay mode.
Overlay mode.
The CH B1 / CH B2 / CH B3 switch provides an overlaid display of
any two, or all three of these inputs.
any two, or all three of these inputs.
Offset Menu
When only B input channels are displayed, an offset readout appears
in the upper right corner of the waveform CRT.
in the upper right corner of the waveform CRT.
To obtain the Offset menu, touch <OFFSET MENU> until <ON> is
outlined.
outlined.
Touch <OFFSET> until <VAR> is outlined, and touch <CH B2> or
<CH B3> to assign large knob function to desired offset. (If only two
input channels are selected, the menu will only provide one offset.)
<CH B3> to assign large knob function to desired offset. (If only two
input channels are selected, the menu will only provide one offset.)
Using the large knob, adjust offset of the selected display with
respect to the other two displays.
respect to the other two displays.
Operating Instructions
3–26
1780R-Series Operator’s Manual
Overlay Operation
NOTE. Switch function is further described in Section 2.
Select the Overlay mode of operation by pushing the PARADE/
OVERLAY button, shown in Figure 3–11, until the Overlay LED
lights. Two pushes may be required, depending on the previous
condition.
OVERLAY button, shown in Figure 3–11, until the Overlay LED
lights. Two pushes may be required, depending on the previous
condition.
The instrument is forced to One Line operation. Two and Three Line
modes are locked out; a beep sounds if the switch is pushed. The
LINE/FIELD switch is still operational.
modes are locked out; a beep sounds if the switch is pushed. The
LINE/FIELD switch is still operational.
Overlaid Displays
The CH A/PROBE switch will select from the following input
channel combinations for overlaid display:
channel combinations for overlaid display:
CH A and CH B1
CH A and PROBE
CH B1 and PROBE
CH A and PROBE
CH B1 and PROBE
Subtract modes (A–B1 / B1–B2 / B1–B3 switch) are unavailable in
Overlay mode.
Overlay mode.
The CH B1 / CH B2 / CH B3 switch provides an overlaid display of
any two, or all three of these inputs.
any two, or all three of these inputs.
Offset Menu
When only B input channels are displayed, an offset readout appears
in the upper right corner of the waveform CRT.
in the upper right corner of the waveform CRT.
To obtain the Offset menu, touch <OFFSET MENU> until <ON> is
outlined.
outlined.
Touch <OFFSET> until <VAR> is outlined, and touch <CH B2> or
<CH B3> to assign large knob function to desired offset. (If only two
input channels are selected, the menu will only provide one offset.)
<CH B3> to assign large knob function to desired offset. (If only two
input channels are selected, the menu will only provide one offset.)
Using the large knob, adjust offset of the selected display with
respect to the other two displays.
respect to the other two displays.