Vertical And Horizontal Mode - Tektronix 7704A Instruction Manual

OPERATING CHECKOUT
The following procedure checks the basic operation of
the instrument. It may also be used for familiarization with
the instrument or as an incoming inspection.
Preliminary
1. Set the front-panel controls as follows:
INTENSITY Counterclockwise
A INTEN Midrange
FOCUS Midrange
B INTEN Midrange
READOUT OFF
GRAT ILLUM Counterclockwise
VERTICAL MODE LEFT
A TRIGGER SOURCE VERT MODE
HORIZONTAL MODE A
VERT TRACE
SEPARATION (B) Midrange
B TRIGGER SOURCE VERT MODE
2. Connect the instrument to a power source that meets
the voltage and frequency requirements of this instrument.
If the available line voltage is outside the limits of the Line
Selector switch (on rear panel), see '"Operating Voltage'' in
this section.
3. Insert 7A-series amplifier units into both vertical
compartments. Insert 7B-series time-base units into both
horizontal compartments.
4. Pull the POWER switch to ON. Allow several minutes
warmup so the instrument can reach a normal operating
temperature before proceeding.
5. Set both vertical units for a vertical deflection factor
of two volts/division and center the vertical position
controls.
6. Set both time-base units for a sweep rate of 0.5
millisecond/division in the auto, internal trigger mode.
7. Advance the INTENSITY control until the trace is at
the desired viewing level (near midrange).
8. Connect the 4V CALIBRATOR signal to the input
connector of the LEFT VERT unit with the special patch
cord (supplied accessory).
®
Operating Instructions—7704A Operators
9. Adjust the FOCUS control for a well-defined display
over the entire trace length. (If focused display cannot be
obtained, see ''Display Focus'' in this section.)
10. Disconnect the input signal and position the trace
(with the LEFT VERT unit position control) on the center
horizontal line of the graticule. If the trace is not parallel
with the center horizontal line, re-adjust the TRACE
ROTATION control.
11. Rotate the GRAT ILLUM control throughout its
range and notice that the graticule lines are illuminated as
the control is turned clockwise (most obvious with tinted
filter installed). Set control so graticule lines are illuminated
as desired.
Vertical and Horizontal Gain Check
12. Connect the 4V CALIBRATOR pin-jack to the
input connector of either vertical unit using the BNC to
pin-jack cable (supplied accessory) and BNC T connector.
Connect the output of the BNC T connector to the input of
the other vertical unit with a BNC cable.
The display should be two divisions in amplitude with
five complete cycles shown horizontally. An incorrect
display indicates that the plug-ins need to be recalibrated.
See the instruction manual of the applicable plug-in unit for
adjustment information.
Vertical and Horizontal Modes
13. Notice that the POSITION controls of only the
LEFT VERT unit and the A HORIZ time-base unit have
any effect on the displayed trace. Position the start of the
trace to the left edge of the graticule with the A HORIZ
time-base unit POSITION control. Move the trace to the
upper half of the graticule with the LEFT VERT unit
POSITION control.
14. Press the RIGHT button of the VERTICAL MODE
switch. Also press the B button of the HORIZONTAL
MODE switch. Notice that the position controls of only the
RIGHT VERT unit and the B HORIZ time-base unit have
any effect on the displayed trace.
15. Position the start of the trace to the left edge of the
graticule with the B HORIZ time-base POSITION control
and move the display to the bottom half of the graticule
with the RIGHT VERT unit POSITION control.
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