Manual Scan; First-Time Operation - Tektronix 1S1 Instruction Manual

Operating Instructions – Type 1S1
SAMPLES/CM Adjust number of samples (dots) displayed
Control per cm of horizontal displacement, and
thus adjusts display repetition rate, when
DISPLAY MODE switch is set to NORMAL
or SINGLE SWEEP. Normally is adjusted
for maximum resolution with minimum dis-
play flicker. Dot density is continuously
variable from approximately 5 samples/
cm to many thousands of samples/cm
In counterclockwise detent position (SWEEP
OFF), dot is displayed on crt screen and
may move extremely slowly across screen.
SAMPLES/CM control does not function
when DISPLAY MODE switch is at EXT
HORIZ or MAN positions.
DISPLAY MODE Selects one of 4 modes of display pre-
Switch sentation: NORMAL-Presents normal re-
petitive-sweep display; SINGLE SWEEP-
Presents single sweep of display each time
START button is pressed; EXT HORIZ-
Permits application of external sweep sig
nal through EXT HORIZ INPUT jack;
MAN-Permits manual scan of equivalent-
time display with MANUAL SCAN control.
START Starts single sweep of display when button
(Pushbutton) is pressed if DISPLAY MODE switch is
Switch set to SINGLE SWEEP position. Sweep is
then held off until START button is pressed
again or until DISPLAY MODE switch is set
to another position.

MANUAL SCAN

Manually moves crt spot horizontally to
or EXT HORIZ trace out equivalent-time display when
ATTEN Control DISPLAY MODE switch is set to MAN.
Also serves as input attenuator for external
scan voltage applied to EXT HORIZ IN-
PUT jack when DISPLAY MODE switch is
set to EXT HORIZ position. In either case,
equivalent-time sweep rate of display is
same as when DISPLAY MODE switch is
set to NORMAL, and depends on setting
of TIME/CM switch.
EXT HORIZ Permits application of external signal for
INPUT Jack scanning
DISPLAY MODE switch is set to EXT HORIZ
position. Attenuation of input signal is
adjusted by EXT HORIZ ATTEN control,
and equivalent-time sweep rate of dis-
play is set by TIME/CM control. Deflection
factor is adjustable from 1 volt/cm to
more than 16 volts/cm.
HORIZ OUTPUT Provides output waveform for driving hori-
Jack zontal deflection of display oscilloscope.
Connection is made through oscilloscope
External
amplitude (through 10k ohms) is 1 volt
/cm, therefore the oscilloscope horizontal de-
flection factor must be set to 1 volt/cm for
correct equivalent-time sweep rates. Out-
put signal may be used for driving pen
recorder, since signal corresponds to real-
time vertical signal available through VERT
OUTPUT jack. When using normal stair
2-4
equivalent-time display
Horizontal Input jack.
The first 18 steps of the following procedure describe
setting up the crt display when using a Type 1S1 and a dis-
play oscilloscope. These steps may be used in installing a
Type 1S1.
The remaining steps of the procedure demonstrate the
basic operation of the Type 1S1 front-panel controls. These
demonstration steps are not required for setting up the
sampling system.
1. With the display oscilloscope power turned off, insert
the Type 1S1 in the plug-in compartment.
2. Set the oscilloscope Intensity control counterclockwise.
3. Turn on the oscilloscope power switch.
4. Connect a banana/banana patch cord from the Type
1S1 HORIZ OUTPUT jack to the oscilloscope External
Horizontal Input jack.
5. Set the controls as follows:
mVOLTS/CM
mVolts/Cm VARIABLE
VERT POSITION
DC OFFSET
TIME POSITION
FINE
SMOOTHING
SAMPLES/CM
DISPLAY MODE
when
MANUAL SCAN
EXT HORIZ ATTEN
TIME/CM
Time/Cm VARIABLE
TRIGGER SOURCE
TRIGGER SENSITIVITY
RECOVERY TIME
Output
Triggering controls
Horizontal Display
Amplitude Calibrator
Crt Cathode Selector
case sweep, duration of output staircase
steps depends on setting of SAMPLES/CM
control, repetition rate of trigger circuit,
and time position range used.

FIRST-TIME OPERATION

Type 1S1
200
CAL
Centered
At center of 10-turn range
Clockwise
Centered
NORM (Clockwise)
Centered
NORMAL
Clockwise
2 nSEC
CAL
INT +
Clockwise
Centered
Oscilloscope
Set to hold off sweep
Ext X 1
5 v
Chopped Blanking