Table of Contents
Advertisement
The
Rhino-Larynx
Stroboscope
Type 4914 is a combination of strobo-
scope, fixed light source and funda-
mental frequency counter in a single
unit. These are optimized for exami-
nation of voice functions.
The instrument includes an auto-
matic level control and a tracking fil-
ter which detects and locks onto the
first harmonic frequency of the voice.
The voice signal is picked up by a
larynx microphone (stethoscope cou-
pler) and transmitted acoustically to
the instrument where it is transduced
into an electrical
signal.
By means
of
an automatic level control, a tracking
filter and a phase locked loop, a pulse
train is
generated
which closely repre-
sents
the first harmonic frequency
(the fundamental frequency)
of
the
voice.
From this pulse
train the
voice fre-
quency is
counted
and displayed. The
LIGHT SOURCE:
Combined Xenon and Halogen light source
LAMPS:
Halogen Lamp: 150 W. Expected life 50
h.
Stroboscopic Lamp: Half peak intensity du-
ration
:
-5 µs;
Energy: approx.
0,7 J per pulse
Expected
life:
38 million single flashes equal
to 90 h at a max. frequency of approx.
118
Hz,
or 1 thousand single photo flashes
with 50% reduction
in
light output
FREQUENCY RANGE:
Microphone Trigger:
60
-
1500 Hz
External Generator: 60
-
2000 Hz
OPERATING MODES:
(Controlled
by pedal)
Fixed Light: Using Halogen Lamp
Phase Delay (Stroboscopic Light): Variable
0°
to
360°
Photo: Remote activation of single flash via
camera flash-contact. Reset time 30 s
Slow Motion (Stroboscopic Light): 1,4 Hz
(fixed frequency)
Type of Light
electronic circuits are intended for fre-
quency measurement of sustained
vowels.
The phase of the input
signal
is con-
tinuously compared with a reference
phase. This reference phase is either
continuously changing (slow motion
operating mode) or it can be held at a
fixed value selected using the pedal
(phase delay). Each time the input
signal
phase is equal to the reference
phase, a synchronizing signal is gener-
ated for the
stroboscope
lamp and the
trigger output. The stroboscope lamp
flashes for approx. 5
µs
and is then
dark until the next trigger signal.
If
the
trigger
flash input is activated be-
fore the synchronizing signal, a large
condenser passes an additional charge
through the lamp. This extends the
short
flash to
give a total
flash time
of
approx. 80
µs,
which is
sufficient to
expose photographic film.
Specifications 4914
TRIGGERING:
Normal triggering by means of robust stetho-
scope-type larynx microphone and acoustic
coupler to instrument. Alternatively, via Trig-
ger Input
INPUT /OUTPUT:
All trigger inputs and outputs are floating
Trigger Input: BNC coaxial socket
Input Voltage:
1
-
10 V RMS
Trigger Output: BNC coaxial socket
Output Voltage
:
10 V Peak. Approx. 14
µS
positive pulses
Flash-Trigger Input: BNC 3-pole socket for
connection of photo cable
Microphone Input: Acoustical from Stetho-
scope Coupler to built-in microphone
Light Output: Via selected output coupler for
the desired light receiving device
Pedal Connector: 6 pole DIN connector
ELECTROMAGNETIC COMPATIBILITY:
Complies with Class B computing device of
American
FCC
(Federal
Communication
Commission) Rules
llluminance [k lux]
(at distance from end of optical cable)
25mm
50mm
100mm
Halogen light
240
80
20
Stroboscope light
1
60
20
5
Light Exposure [k lux s]
Photo flash
2
24
8
2
1
Mean value
at
100 Hz
T00273GBO
2
Each
shot
B0µs
(hall
peak intensity duration)
These values are
reduced
if optical
cables
other than the B&K
standard cable are used.
For
exposure calculations consider
reductions from
additional optical systems
A 150 W halogen lamp is built into
the same lamp assembly as the strobo-
scope
lamp. When it is activated a
solenoid
moves a small mirror into its
light path to direct the light to the
light
output.
The selected light output from the
instrument is transferred to the light-
probe mirror-holder or other optical
devices via a flexible light cable with
superior light carrying capabilities.
The light output available from the
optic cable is given in the specifica-
tions below.
Both halogen lamp and
stroboscope
lamp generate considerable heat and
it is recommended
that they
be used
intermittently to extend the life of the
lamps. However, if used for long peri-
ods
a thermostat activated fan keeps
the
internal temperature within ac-
ceptable
limits.
SAFETY:
Complies with IEC 601-1 Class II Type BF
ENVIRONMENT:
Temperature Range:
+
5 to 40
°
C (
+
41 to
104
°
F)
Humidity: 0 to 90% RH non-condensing (at
30
°
c)
POWER REQUIREMENTS:
100; 115; 127; 200; 220 or 240 V (50 to 60 Hz)
±
10% AC; 200 VA. Complies with Safety
Class II of IEC 601-1 (Type BF)
CABINET:
Supplied as model A (light-weight metal cabi-
net) or model C as A but for rack mounting
DIMENSIONS:
Metal
cabinet,
excluding knobs and
feet
Height: 177 mm (7 ,0 in)
Width: 430 mm (16,9 in)
Depth: 320 mm (12,6 in)
WEIGHT: 18 kg (39,7 lbs)
ACCESSORIES
INCLUDED:
1 Flexible Light Cable
..........................
AE 6100
1 Light-Probe Mirror-Holder
...............
AE 6200
1 Larynx Mirror No .5
.............................
QA 0113
1 Larynx Mirror No .7
.............................
QA 0114
1 Larynx Mirror No.9
.............................
QA 0115
1 Output Coupler (Storz)
......................
UA 0845
1 Output Coupler (Olympus)
...............
DB 2632
1 Blank Output Coupler .....
..............
.. ... DP 0594
1 Stethoscope Coupler
...........
..
...........
UA 0776
1 Pedal.
............................................
.. ...... UA 0727
1 Cable Lifter
....................... ........
........... UA 0807
1 Accessory Tray
...................................
GV 1895
1 Power Cable
........................................
AN 0020
1 Photo Trigger Cable
........
..
......
....
......
AO 0375
2 BNC Plugs ......
..
... ...................
...............
JP 0035
1 6-pin DIN Plug
......................................
JP 0600
1 Set of Fuses
ACCESSORIES AVAILABLE:
Spare Xenon Light Tube
....................
.. VS 1006
Advertisement
Table of Contents
