MRV Communications TERESCOPE TS800/155 - Manual (Page 61)

M R V C o m m u n i c a t i o n s , I n c . – I n s t a l l a t i o n M a n u a l
51
Digital Readout vs. Distance
These tables are only intended to give you an idea of what digital readout you could
expect according to the distance to link.
D= Distance [m]
R= Reading (Digital readout)
D 50 100 150 200 250 300 350 400 450 500 550 600 650 700
R 560 520 420 360 300 240 180 140 120 100 80 60 40 30
D 50 100 200 400 500 600 800 900 1000 1100 1300 1500 1700 1900
R 960 760 520 410 380 330 210 170 130 100 70 40 35 25
Actual reading may be greater or up to 15% lower.
D 50 100 150 200 250 300 350 400 450 500 550 600 680 1000
R 1150 1150 1110 1020 940 880 800 730 640 580 520 470 400 250
Actual reading may be greater or up to 15% lower.
NOTE: with the Transmitter in “Attenuated” mode for distances under 150m
(DIP switch toggle 1 OFF), the DVM should show readings varying from 800
to 1150.
A note on the Digital Readout Charactersitics of the TS700/G
The digital readout of the TS700G works under a different principle from
previous TereScopes in the series. The readout level is derived from the actual
light level at the photodetector, much like a standard optical power meter.
For this reason, background light entering the lens will also contribute to the
reading. A typical reading with no signal on a sunny day would be 030 to 080.
This will sum with the signal strength, so outside the reading at the minimum
threshold would be higher than the reading for the corresponding signal in a
bench test. Due to the AGC function, for higher signals the offset in the
reading gradually becomes negligible. All this has no effect on the actual link
performance.
Please note, however, that the Air Rx LED is not affected by background
light, and is purely a function of the received data level. So even with high
background light reading, the Air Rx LED will not light in the absence of
signal.
TS700/155
TS700/100
TS800/155
TS700/G
APPENDIX B