MAGNIFIER
To expand a particular part of the display
horizontally, first use the Horizontal POSITION
control to position that part of the display so
that it falls at the center of the graticule. Then
turn the HORIZONTAL DISPLAY switch to the
p|ay ‘t f o t o f it ?
DISPLAY
NORMAL
(xi) [L
f
•
t
r
* t
HORIZONTAL
DISPLAY
Fig. 3-5. Magnified sweep.
The portion of the waveform at the vertical centerline
remains stationary as the sweep is magnified. The dis
played waveform is expanded left and right from the
centerline. The lower waveform is a two times magni
fication of the upper waveform.
expanded 2, 5, 10, or 20 times depending on the
setting of the HORIZONTAL DISPLAY switch. At
the same time, the SWEEP MAGNIFIER ON in
dicator lamp will light, indicating that the dis
play has been expanded. Any portion of the
original unmagnified display can then be shown
by rotating the Horizontal POSITION control.
In magnified sweep operation, the sweep
speed is multiplied by the magnification. This
means that the time per centimeter indicated by
the TIME/CM switch must actually be divided by
the magnification to obtain the correct time re
quired for the sweep to move one centimeter.
For example, if the TIME/CM switch is set at 5
MILLISEC, and the magnifier is set at 5X, the
true time per centimeter is 5 milliseconds divided
by 5, or 1 millisecond per centimeter.
Magnified sweep rates are all calibrated with
in 3% accuracy so long as their true time per"
centimeter is 1 microsecond or more. Sweep
speeds faster than this are uncalibrated and may
be unlinear. The SWEEP MAGNIFIER UNCALI
BRATED indicator lamp lights whenever the
maximum calibrated sweep speed is exceeded
to indicate that the sweep is uncalibrated.
EXTERNAL HORIZONTAL INPUT
On the Type 502, it is possible to horizontally
deflect one or both of the spots across the screen
by means of some externally derived waveform,
rather than by means of the internal sweep cir
cuits. This permits the oscilloscope to be usee}
for either single or dual-beam X-Y curve tracing.
For single-beam applications where equal hori
zontal and vertical-deflection factors are desir
able, the upper-beam amplifier can be switched
to the crt horizontal-deflection plates by placing
the HORIZ. DEF. PLATE SELECTOR switch at the
UPPER BEAM AMP. position. This type of opera
tion provides 200 /xv/cm to 20 v/cm sensitivity
and differential input for both horizontal and
vertical deflection. The lower beam is used for
this function while the upper beam is auto
matically positioned off of the screen. A panel
light indicates when the upper-beam amplifier
is connected to the horizontal-deflection plates.
For dual-beam applications, an external wave
form can be applied to the horizontal amplifier
by connecting the waveform to the EXTERNAL
jack. The horizontal deflection sensitivity is con
trolled by the setting of the HORIZONTAL DIS
PLAY switch.
®
3-6
OPERATING INSTRUCTIONS — TYPE 502
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