High performance
giving the highest possible accuracy
The PL1
first order precision level was developed after long and through research
into every aspect of use under all possible working conditions.
Tilting screw
mechanism for fine adjustment
The tilting
screw used to level the line of sight is engraved with graduations that
accurately indicate the inclination, and index lines that indicate the
number of turns of the tilting screw. The tilting screw is divided into
50 equal divisions, each equaling 2" of inclination
Coincidence type
optics give sharp bubble image
Innovative
optical design has been used in the coincidence bubble reading optics
to ensure a sharp image of the bubble which is magnified to twice normal
size.
Optical micrometer
allows precise reading
The PL1
is equipped with an optical micrometer which enables staff graduations
to be subdivided directly to 0.1mm, and to 0.01mm by estimation. The micrometer
knob is turned until the graduation line on the staff bisects the wedge-shaped
reticle lines of the PL1 telescope. the shift is numerically displayed
in the optical micrometer window, and this reading is added to the staff
reading to give direct reading accuracy to 0.01mm.
Wedge shaped
reticle for precise reading
The high
resolution telescope, which gives a sharp image of the target, is provided
with a wedge-type reticle to read staff graduations more accurately. In
the distance to the staff can be easily obtained by using the stadia lines.
Optical wedge
provides easy and fine adjustment
The
adjustment to the line of sight is simple. It is not necessary to adjust
screws on the tubular level. Simply turn the optical wedge until the line
of sight is horizontal to get exact results.
|
|
PL1
|
B1/B1C
|
B20
|
B21
|
| Image
|
Erect
|
Erect
|
Erect
|
Erect
|
| Magnification
|
42x
|
32x
|
32x
or 40x (opt.) |
30x
|
| Resolving
Power |
2”
of arc |
3"
|
n/a
|
n/a
|
| Field
of View |
1°
10' (2.0 ft. @ 100 ft.) |
1°
20’ (2.3 ft. @ 100 ft.) |
1°
20’ (2.3 ft. @ 100 ft.) |
1°
20’ (2.3 ft. @ 100 ft.) |
| Minimum
Focus |
6.6
ft. (2m) |
7.5
ft. (2.3m) |
1
ft. (0.3m) |
1
ft. (0.3m) |
| Stadia
Ratio |
1:100
|
0.3:100
or 1:100 |
1:100
|
1:100
|
| Compensator
— PL1 (split-image tubular vial); all others (wire-hung; magnetically
damped) |
| Setting
Accuracy |
n/a
|
0.3"
|
0.3"
|
0.5"
|
| Range
|
n/a
|
±10'
|
±
15' |
±
15' |
| Leveling
Accuracy (all models)—in 1.0 km (1 mile) of double-run leveling |
| Standard
Deviation |
±
0.2mm / 001 ft. |
±
0.8mm / .003 ft. |
±
1.0mm / .004 ft. |
±
1.5mm / .006 ft. |
| w/
micrometer |
.001
in (0.1m) |
±
0.5mm / .002 ft. |
±
0.8mm / .003 ft. |
±
1.2mm / .005 ft. |
| Level
Vial (all models) — circular |
| Sensitivity
|
3.5'
/ 2mm |
10'
/ 2mm |
10'
/ 2mm |
10'
/ 2mm |
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