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Instruction Manual
Portable Stroboscope Type 491 2
033-0587
•.
.
...
An ultra-compact unit combining a strobo-
scope with a tachometer
.
A 4-digit liquid
crystal display indicates tacho frequency
(from a choice of separately available trans-
ducers) or strobe lamp repetition rate in
hertz or r
/min.
The flash rate may be syn-
chronized externally or driven from an
·
inter-
nal generator whose frequency range is 5
to 125 Hz (300 to 7500 r/min). Recharge-
able batteries contained in the handle give
a minimum of 2,5 hours' operation from
one charge
.
The xenon lamp provides a con-
centrated beam of white light whose bright-
ness is independent of frequency above
25 Hz (1500
r/
min)
.
+
Briiel & Kj~r
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