SPECIFICATIONS
SKY SCREEN CHARACTERISTICS:
Shooting
Area
Active Area
Beam Width
Beam Thickness
SCREEN SPACING:
103 sq in
84 sq in
30 degrees
0.1 inch
(6 inches above unit)
Minimum spacing
of
1 foot is allowed;
minimum
spacing
of
2 feet is
recommended.
Spacing
of
4 feet is suggested for high velocity rifle
s.
Spacing
of
primary screens can be set from 1 to
15
feet and from
10
to 150
feet
in
increments
of
10 feet; proof screen is always set midway between
pnmary screens.
PRINTER:
The optional built-in printer prints with real ink
on
standatd 2.25 inch plain
paper. It prints primary velocity, round number,
and
proof velocity as each
round
is
flred. It prints statistical summary
of
primary velocity.
TEMPERA
TORE
OPERATING RANGE:
0
0
to 50
0
Centigrade
32
0
to
122
0
Fahrenheit.
Systems typically operate at temperatures down to OaF
or
_18
0
C if the
battery can supply reliable power.
BATTERY:
A single nine-volt NEDA 1604 alkaline battery
is
supplied. A fresh battery
will operate the system for up
to
25 hours including 1000 print lines. Internal
battery compartment includes space for
spate
battery.
Page 26
EDIT MODE:
An edit mode allows for instant replay
of
up to twenty shots. During replay
you can omit questioned shots from the summary.
CRYSTAL
OSCILLATOR FREQUENCY:
4.0
MHz
oscillator for 0.25 microsecond time resolution.
ACCURACY:
The
expected error on
anyone
shot depends
on
both velocity and screen
spacing. Typical errors
ate
shown in the table. The table assumes good light
conditions,
datk
bullets, exact screen spacing, and shooting through the
center
of
the Skyscreen III window. Actual errors under your shooting
conditions will be reliably indicated by the
PROOF CHANNEL.
IFf
2Ff
4Ff
8FT
1000 FPS 5 fps 3 fps
I fps I fps
2000FPS
10
fps 5
fp
s
3fps
2
fps
3000 FPS
16
fps 8 fps
4 fps 2
fps
4000 FPS
21
fps
10
fps 5 fps
3fps
You will typically see the above errors as differences between the primary
and proof channels
of
a Model 35P as you shoot under ' normal' conditions.
PROOF
CHANNEL:
The
system alerts you with a flashing display and printed asterisk
if
there is a
significant difference between the two velocity readings. Differences which
trigger the alert are shown for typical velocities
and
screen spacings.
1
Ff
2Ff
4Ff
8FT
1000 FPS 42 fps
21
fps
10
fps
S fps
2000 FPS
83
fps 42
fp
s
21
fps
10
fps
3000 FPS
125
fp
s
63
fps
31
fps
16
fps
4000 FPS 166
fp
s
83fps
42
fps
21
fps
Page 27
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