BRUEL & KJAER 4915 User manual

Instruction Manual
Digital Stroboscope Type 4913
Fibre-Optic Source Type 4915
1-033 0689-1A
BE-0689
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Type 4913 Is a combined Stroboscope/-
Tachometer for visual Investigation and
accurate measurement
of rapid, repetitive
motion, mechanical resonances, vibration
etc. It Includes a hand-held Lamp Unit
US 0008 and may be triggered from an Int.
generator,
power llne or ext. tachometer sig-
nal
to provide a stationary or slow moving
Image
of objects with motion frequency from
5 Hz
to 1OkHz (0,3 to 600 k r/min). · separate
modes with adjustable time and phase delay
permit observation at any required point in
the
motion cycle. In addition a built-In 4-dlglt
display facllltates direct reading of motion
frequency or speed, time or phase delay.
As extra Type 4913 can be coupled with the
Fibre-Optic Source Type 4915. This has a
reslllent 1,8 m long
fibre-optic cable AE 6000
and outputs a convenient point source
of
lllumlnatlon that Is Ideal for stroboscopic
examination
of small components, Intricate
mechanisms and microscope specimens.
For Internal Inspection
of engines and other
machinery, an Endoscope Probe can be
connected.
+ Bri.iel & Kjcer

DIGITAL STROBOSCOPE TYPE 4913
AND
FIBRE-OPTIC STROBOSCOPE SOURCE TYPE 4915
From serial no . 968661 and 1021484 respectively
June 1982

SAFETY CONSIDERATIONS
Types 4913 and 4915 have been designed and tested according to Class II of IEC Publication
348, Safety Requirements for Electronic Measuring Apparatus, and have been supplied in safe
condition. The present Instruction Manual contains information and warnings which should be
followed by the user
to ensure safe operation and to retain the instruments in safe condition.
Special note should be made
of the following:
APPLICATION OF POWER
Before each use
of Stroboscope Type 4913, check that it is set to match the available mains
voltage and that the correct fuse is installed.
SAFETY SYMBOLS
fil The apparatus will be marked with this symbol when it is important that the user refer
to the associated warning statements given in the Instruction Manual.
.l Chassis terminal
rJ-, Earth or ground terminal ,"//' Hazardous voltage
WARNINGS
Keep Types 4913 and 4915 well away from volatile liquids and gasses and operate only in well
ventilated environments.
Whenever
it is likely that the correct function or operating safety of one or other of the
instruments has been impaired, they must be made inoperative and be secured against
unintended operation.
Any internal adjustment, maintenance
or repair of the instruments must be avoided as far as
possible and, if unavoidable, must be carried out only by trained service personnel.

CONTENTS
1. INTRODUCTION AND SPECIFICATIONS (Product Data) ............................................................................. 1
2.
CONTROLS ................................................................ .. .............................................................................................. 3
2.1. DIGITAL STROBOSCOPE TYPE 4913................................................................................ 3
Front Panel ......................................................................................
.. ..................................... 3
Rear Panel ..............................................................................................................................6
2.2. FIBRE-OPTIC STROBOSCOPE SOURCE TYPE 4915
.. ........................... .. ...................... 8
3.
OPERATION WITH HAND-HELD LAMP UNIT US 0008.................................................................................. 9
3.1 . PRELIMINARY ........................................................................................................................9
Environment and Handling................................................................................................... 9
Mounting ................................................................................................................................. 9
Connection
of Mains Supply ............................................................................................. 10
3.2. OPERATION AS A "FREE-RUNNING" STROBOSCOPE ..............................................
11
Determination of Motion Frequency or Speed ............................................................... 11
Determination of Phase Delay or Lag.............................................................................. 13
Timing
of Motion Sequences and Events........................................................................ 14
Slow-Motion Observation................................................................................................... 14
3.3. OPERATION FROM EXTERNAL TRIGGER SOURCE .................................................... 15
External Instruments ...........................................................................................................
15
Photoelectric Tachometer Probe MM 0012 ..................................................................... 16
Magnetic Transducer
MM 0002 ......................................................................................... 17
3.4. USE WITH LINE TRIGGER SOURCE ...............................................................................
17
3.5. USE WITH DOUBLE FLASH IGNITION ............................................................................ 18
3.6. USE WITH SINGLE FLASH IGNITION .............................................................................. 18
Local and Remote Activation ............................................................................................ 18
Flash
Photography ............................................................................................................... 18
3.7. USE WITH AUXILIARY LIGHT SOURCE.......................................................................... 19
3.8. REMOTE CONTROL ...........................................................................................................
21
4. OPERATION WITH FIBRE-OPTIC SOURCE TYPE 4915..............................................................................22
4.1. PRELIMINARY ......................................................................................................................
22
Environment and Handling................................................................................................. 22
Connections and Mounting................................................................................................ 22
Use and Care of Fibre-Optic Cable AE 6000 ................................................................. 23
4.2. NORMAL SINGLE AND REPETITIVE FLASH OPERATION........................................... 24
4.3. SINGLE "PHOTO" FLASH OPERATION.......................................................................... 24
Triggering ............................................................................................................................. 24
Flash Photography ............................................................................................................... 25

5. SERVICE AND REPAIR.........................................................................................................................................26
5.1. GENERAL..............................................................................................................................26
5.2. REPLACEMENT OF FLASH TUBE.................................................................................... 26
Hand-Held
Lamp Unit US 0008.......................................................................................... 26
Fibre-Optic Source Type 4915 .......................................................................................... 27

types 4913 and 4915
Digital Stroboscope and Fibre-Optic Source
USES: FEATURES:
• Investigation of repetitive, high-speed motion
with engines and machines etc. • Combined
motion analyzer/tachometer
• Mechanical design, development and trouble
shooting
aid
• Slow motion frequency plus phase and time delay
adjustments
• Synchronization with internal generator, line or
external trigger source• Resonance search
and vibration mode study tests
• Stroboscopic
photography with time or phase
delay •
Automatic tracking of motion frequency plus
remote control
•
Internal inspection of machinery plus examina-
tion of microscope specimens • 4-digit
display of motion frequency/speed, phase-
/time delay, slow motion frequency/speed
The Brtiel & Kjrer Type 4913 is a
versatile
instrument with the com-
bined function of stroboscopic motion
analyzer and tachometer. Using its
high intensity flash source a station-
ary or slow moving stroboscopic image
of all kinds of rapid, repetitive motion
can be obtained, making it extremely
easy to observe the precise action and
motion eccentricities of vibration test
components, engines, machines etc.
The flash rate may be synchronized
with
motion frequencies from 5 Hz to
10 kHz (0,3 to 600 k r/min) and can be
triggered from
an internal generator,
1-0440013-1A
BP 0013
4913
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power line or external tachometer sig-
nal such as from a Photoelectric Probe
MM 0012 or Magnetic Probe MM
0002. Separate modes with adjustable
time and phase delay facilitate
measurement and observation at any
required point in the motion cycle and
a "Slow Motion" mode permits sub-
jects to be viewed with an apparent
motion frequency of 0,05 to 5 Hz.
Using
the built-in 4-digit display an
accurate indication of motion frequen-
cy
or speed, time or phase delay can be
obtained which is useful for both
measurements and setting-up of the
4915
instrument. Additional features are
choice
of local or remote control, plus
single flash
operation for photograhic
purposes.
As
an optional light source Type
4913 can be coupled with the Fibre-
Optic Stroboscope Source
Type 4915.
Light transmission is via a resilient
1,8 m long fibre-optic cable AE 6000
which
outputs a convenient point
source of illumination that is ideal for
stroboscopic
examination of small
mechanical components,
intricate
mechanisms and microscope speci-
mens etc.

Furthermore by coupling the light
output of AE 6000 with a matching
Endoscope Probe as shown overleaf,
inspection
of internal surfaces, bear-
LIGHT SOURCE:
Hand-held Lamp Unit
US 0008 with 40 Watt
Xenon-filled flash tube included. Provides
tightly collimated,
cold-light flash beam and
has integral 3 m long cable plus 3/8/f UNC
tripod fastening thread
Flaah Duration: -3 µs at half peak intensity
Average llluminance:
-17 k lux at 250 mm
(10 in)
from lamp, 7 k lux at 500 mm (20 in)
and 2 k tux
at 1 m (40 in)
Min. Lamp Life: 75 million single flashes, or
200 hours at maximum flash rate of 100 Hz
for 50%
reduction in light output
FREQUENCY RANGES:
Int. Generator: 5
to 105 Hz (300 to
6300 r/min)
Ext. Trigger: 0 to 10 kHz (0 to 600 k r/min)
OPERATING MODES:
Light Off: Flash
ignition disconnected, but
display operates
for use as tachometer
Phaae Delay: 0° to 360° adjustment, phase
locked
to Int., Ext. or Line source
Time Delay: 0 to 3,6 s adjustment, synchro-
nized with Int., Ext.
or Line source
Slow Motion: Apparent motion frequency ad-
justable from 0,05 to 5 Hz (3 to 300 r/min),
synchronized
with Int., Ext. or Line source
Double Flaah: Similar
to phase Delay, but
providing double image at complementary
points in
motion cycle. At trigger frequencies
above
50 Hz, . repetitive single flash is
obtained
DISPLAY AND INDICATING MODES:
4-digit LED display, 7-segment numerals
18 mm (0,7 in) high
Trigger Freq: 5
to 9999 Hz or 300 r/min to
600 k r/min to within ±0,3 % +1 digit
LIGHT SOURCE:
Modular
unit containing 40 Watt Xenon-filled
flash tube. Includes 1,8 m flexible
Fibre-Optic
Cable AE 6000 and transmits a 4,5 mm diam-
eter cold-light flash beam with radiation angle
of
approximately 60°
Flaah Duration:
Normal:
-3 µs
Photo: -150 µs
(half peak intensity):
Average llluminance:
Normal:
-12 k lux at 25 mm (1 in) and
1,4 k lux
at 100 mm (4 in) from cable output
Photo: -so times peak intensity of normal
mode
Lamp Life:
Normal: -
75 million single flashes, or
200 hours at maximum flash rate of 100 Hz
Photo:
-1 thousand single flashes
for 50% reduction in light output
ings and working mechanisms actually
hidden inside engines and machines is
possible. A wide range
of suitable
probes are available from
the West
Specifications 4913
Delay: 0 to 360° phase delay to nearest de-
gree, Oto 3,6 s time delay to nearest 0,2 ms
or better
Slow Motion Freq: 0,05 to 5 Hz or 3 to
300 r/min to within ± 1 digit
EXT. TRIGGER INPUT:
BNT coaxial
socket for triggering via
tachometer
probe or external source provid-
ing periodic electrical signal
Input Voltage: 100
mv to 30 V Pk-Pk
Input Impedance:
-50 kO
DC Output: +8 V (50 mA max) DC for power-
ing an external tachometer probe
SINGLE FLASH INPUT:
BNT coaxial
socket for remote activation of
single flash via camera or electrical pulse.
Single flash synchronized
with Ext. or Line
source and including phase
or time delay set
on instrument is also possible
Input Pulae: +15 V Pk. Minimum
width 2 µs
·
Minimum Delay: 5 µs
Input Impedance: -100 kO
SIGNAL OUTPUT:
6-pin DIN socket providing flash trigger and
ignition reference pulses for use of Fibre-
Optic Stroboscope Source Type 4915 or Por-
table Stroboscope Type 4912 as an auxiliary
light source
Output Pulses: +15
V, - 2 ms.
Max. Load:
100 O
REMOTE CONTROL:
Remote selection
of Light Off, Slow Motion or
Phase Delay mode, plus adjustment of Phase
Delay via
6-pin DIN socket ·
Specifications 4915
OPERATING MODES:
Normal: as with Type 4913
Photo: manual
or remote activation high in-
tensity single flash via camera flash
contacts
· or electrical pulse. Reset time -30 s
ELECTROMAGNETIC COMPATIBILITY:
Complies with Class B computing device of
American FCC (Federal Communication
Commission) Rules
ENVIRONMENT:
Temperature Range: -10
to 55°C (+14 to
131°F)
Humidity: o
to 90% RH non-condensing
POWER REQUIREMENTS:
via Stroboscope
Type 4913
DIMENSIONS:
Metal cabinet, excluding
knobs and feet
German Companies Richard Wolf
GmbH and Karl Storz GmbH. For fit-
ting the 4915 with other fibre-optic
systems, a blank coupler is included.
ELECTROMAGNETIC COMPATIBILITY:
Complies with Class B computing device of
American FCC (Federal Communication
Commission) Rules
ENVIRONMENT:
Temperature Range: -10 to 55°C (+14 to
131°F)
Humidity: 0
to 90% RH non-condensing
POWER REQUIREME.NTS:
100;115;127;200;220;240 V (50 to 60 Hz)
± 10% AC;
45 VA . Complies with Safety Class
II of IEC 348
DIMENSIONS:
Control Unit, excluding knobs and feet
Height: 132,6 mm (5,2 in)
Width: 209,5 mm (8,3 in)
Depth: 200
mm (7,9 in)
(B & K modular cabinet KK 0025,
6/12 of 19n
rack module)
WEIGHT:
Control Unit: 5,2
kg (11,5 lbs)
Lamp Unit: 0,8 kg (1,8 lbs)
ACCESSORIES INCLUDED:
1 x Lamp Unit .........................
.. .. ....... . .. US 0008
1 x 3/8 n -1 /4n UNC Tripod Bush .. ,..... DB 2164
1 x BNC Plug
... ....................... .. ..............JP 0035
2 X BNT Plug .
.. ....... ...... .. .. ................ ~ ... ..JP 0315
2 x
6-pin Plug .. ................................ .. . .... JP 0601
1 x Camera Flash Contact Cable ...... AQ 0375
1 x Power Cable...................
... '. ....... .. ... .AN 0020
ACCESSORIES AVAILABLE:
Photoelectric Probe .........
.. ..................MM 0012
Magnetic.Probe.
.. ........... .. . .... . ... .. ..........MM 0002
Height: 132,6
mm (5,2 in)
Width: 139,5 mm (5,5 in)
Depth: 200 mm (7,9 in)
(B & K
modular cabinet KK 0024, 4/12 of 19"
rack module)
WEIGHT: 2,5
kg (5,5 lbs)
ACCESSORIES INCLUDED:
1 x
Fibre-Optic Cable ... .. .............. ...... AE 6000
1 x Output
Coupler (4,5 mm Dia.) ...... UA 0726
1
~ Blank Output Coupler .................... DB 2484
ACCESSORIES AVAILABLE:
Endoscope Probes
are available from
Richard Wolf GmbH and Karl Storz GmbH of
West Germany. For details on your nearest
Wolf
or Storz agent, consult your local B & K
representative

2. CONTROLS
2.1. DIGITAL STROBOSCOPE TYPE 4913
2.1.1.
Front Panel
Trigger Sensitivity J
Ext. Trigger Input
Trigger Slope
Trigger
Error
\
Reset
Power
____ Display
Selector
Delay
._ ______ +-_ Function
Selector
-~-
------+--- Slow Motion
Int . Gen .
811457
Fig. 2. 1. Front panel of Stroboscope Type 4913 and Lamp Unit US 0008
LAMP UNIT US 0008:
Hand-held flash unit with integral 3 m (10 ft) long drive cable for con-
nection to the LAMP OUTPUT socket on the rear panel of the Strobo-
scope Type 4913. At the top of the hand grip is an "On" /"Off" button
for internal connection or disconnection of the lamp drive, whilst in the
base is a 3/8" UNG threaded hole for fastening the unit on a Portable
Tripod UA 0587 or other similar support. To help safeguard the Xenon
flash tube, the
lamp housing has a reinforced polycarbonate window.
3

POWER:
DISPLAY SELECTOR:
FUNCTION SELECTOR:
4
SHOCK HAZARD: Before each use of the 4913 make sure that the lamp
drive cable is properly secured so that it does not become entangled
with operating machinery which may sever the high voltage drive lines
of the cable. Also avoid dismantling the lamp unit without first referring
to Chapter 5 of this Manual, or the separate Service Manual provided.
"On" /"Off" switch for mains power. When it is set to "On", the 4-digit
LED (Light Emitting Diode) DISPLAY of the 4913 should light.
5-position switch for selecting the following indicating modes with the
4-digit LED DISPLAY.
"Trigger Freq.". Two positions for display of internal generator or
external trigger frequency in "Hz" or equivalent operating speed in
"r /min". With the internal generator selected as the trigger source, the
display range is from 5 to 105 Hz or 300 to 6300 r/min respectively,
whilst with an external trigger source it is from 5 to 10 kHz or 300 to
600 k r/min respectively.
"Delay". Single position for display of phase or time delay of the flash
ignition with respect to trigger signal. Display range O to 360° and O to
3,6 s.
"Slow Motion". Two positions indicating the apparent frequency "Hz"
or speed "r/min" of the perceived image obtained with the "Slow
Motion" FUNCTION SELECTOR mode. Display range is from 0,05 to
5 Hz and 3 to 300 r/min respectively.
8-position switch for selecting the following operating modes.
"Light Off". Stand by - lamp off mode with display of phase delay,
trigger or slow motion frequency readout chosen with the DISPLAY
SELECTOR.
"Phase Delay". Selects flash ignition with adjustable O to 360° phase
delay with respect to trigger signal. Permits stationary image of rotat-
ing and reciprocating machinery to be obtained, which using the DELAY
knob may be moved through one complete motion cycle. See section
3.2.2.
"Slow Motion". Selects flash ignition synchronized with the fundamen-
tal (or sub-multiple) of the trigger signal minus the frequency set with
the "Slow Motion" knob. Permits slow moving image of rotating and
reciprocating machinery to be obtained, whose apparent frequency (or
speed) may be adjusted from approximately 0,05 to 5 Hz (3 to
300 r/min) regardless of the motion frequency or operating speed of the
machinery. See section 3.2.4.
"Time Delay". Selects flash ignition with adjustable "0-36 ms", "0-
360 ms" or "0-3,6 s" time delay with respect to trigger signal. Permits
stationary image of rotating and reciprocating machinery to be ob-
tained, which may be moved through part or one or more motion cycles
using the DELAY knob. The "Time Delay" setting, may also be used in
photographing of single events. See sections 3.2.3 and 3.6 respectively.