Schmidt DT Series User manual

Stroboscope
DT Series
Model DT-311N
DT-315N
Edition DT 03.2.E
Operating Instructions
Valid as of: 01.07.2011 • Please keep the manual for future reference!
DT-315N
DT-311N
S C H M I D T
c o n t r o l i n s t r u m e n t s

2
Content
1 Warranty and Liability .............................................................................................. 3
1.1 Notices within the Operating Instructions............................................................... 3
1.2 Responsibilities of the Operating Company ........................................................... 3
1.3 Responsibilities of the Personnel ........................................................................... 3
1.4 Informal Safety Measures ...................................................................................... 4
1.5 Training of the Personnel ....................................................................................... 4
1.6 Intended Use.......................................................................................................... 4
1.7 Dangers in Handling the Device............................................................................. 4
1.8 Copyright................................................................................................................ 4
1.9 EU Declaration of Conformity and WEEE Registration.......................................... 4
2 Available Models....................................................................................................... 5
2.1 Specifications ......................................................................................................... 5
2.2 Delivery Includes.................................................................................................... 6
2.3 Unpacking .............................................................................................................. 6
3 Initial Setup and Operating Procedure ................................................................... 6
3.1 Notes Before Starting Measurement...................................................................... 6
3.2 Connecting the Power Cord (DT-311N only) ......................................................... 7
3.2.1 Connecting the AC Adapter/Charger (DT-315N only) ...................................... 7
3.2.2 Battery Charge (DT-315N only)........................................................................ 7
3.2.3 Battery Change (DT-315N only) ....................................................................... 7
3.3 Operating Elements ............................................................................................... 8
3.3.1 True RPM Measurement .................................................................................. 9
3.4 Measuring with the Stroboscope.......................................................................... 10
3.4.1 Internal Signal Mode Normal operation.......................................................... 10
3.4.2 External Signal Mode ..................................................................................... 10
3.4.2.1 Delay Mode ......................................................................................... 11
3.4.2.2 RPM Display Mode ............................................................................. 11
3.4.2.3 Deg/msec Display Mode ..................................................................... 11
3.4.2.4 Synchronous Output Signal ............................................................... 12
3.5 Memory ................................................................................................................ 12
3.6 Troubleshooting ................................................................................................... 13
4 Service and Maintenance....................................................................................... 14
4.1 Flash Tube Replacement ..................................................................................... 14
5 Cleaning................................................................................................................... 15
6 Correspondence ..................................................................................................... 15
7 Repairs..................................................................................................................... 15

3
1 Warranty and Liability
In principle, the supply of the device is subject to our “General Conditions of Sale and
Delivery.” These have been provided to the operating company on conclusion of the
contract, at the latest.
Warranty:
- Stroboscopes are warranted for 12 months.
Parts subject to wear, electronic components and measuring springs are not covered by
the warranty. No warranty or liability will be accepted for bodily injury or property damage
resulting from one or several of the following causes:
- Misuse or abuse of the device.
- Improper mounting, commissioning, operation and maintenance of the device
(e.g. verification interval).
- Operation of the device if any safeguards are defective or if any safety and protection
precautions are not properly installed or not operative.
- Failure to comply with the notices in the Operating Instructions regarding transport,
storage, mounting, commissioning, operation, maintenance and setup of the device.
- Any unauthorized structural alteration of the device.
- Insufficient inspection of device components that are subject to wear.
- Opening the device or improper repair work.
- Disasters caused by the effects of foreign objects or by force majeure.
1.1 Notices within the Operating Instructions
The fundamental prerequisite for the safe handling of this device and its troublefree opera-
tion is the knowledge of the basic safety notices and safety instructions.
These Operating Instructions contain the most important notices for the safe operation of
the device.
These Operating Instructions, in particular the safety notices, must be observed by any
person who works with the device. In addition, the local valid rules and regulations for the
prevention of accidents must be complied with.
The representations within the Operating Instructions are not true to scale.
The dimensions given are not binding.
General indications of direction, such as FRONT, REAR, RIGHT, LEFT apply when view-
ing the front of the device.
1.2 Responsibilities of the Operating Company
In compliance with the EC Directive 89/655/EEC, the operating company agrees to only
permit persons to work with the device who:
- are familiar with the basic regulations on industrial safety and accident prevention and
who have been trained in handling the device.
- have read and understood the chapter on safety and the warning notices in these
Operating Instructions and have confirmed this with their signatures.
- are examined regularly on their safe and conscientious working method.
1.3 Responsibilities of the Personnel
All persons who work with the device agree to perform the following duties before starting
work:
- to observe the basic regulations on industrial safety and accident prevention.
- to read the chapter on safety and the warning notices in these Operating Instructions and
to confirm with their signatures that they have understood them.

4
1.4 Informal Safety Measures
The Operating Instructions must always be kept on hand where the device is operated.
Apart from the Operating Instructions, the generally and locally valid regulations on acci-
dent prevention and environmental protection must be provided and complied with.
1.5 Training of the Personnel
Only trained and instructed personnel is permitted to work with the device. The responsi-
bilities of the personnel must be clearly defined for mounting, commissioning, operation,
setup, maintenance, and repair. Trainees may only work with the device under the super-
vision of experienced personnel.
1.6 Intended Use
The device is intended exclusively to be used as a Stroboscope. Any other use or any use
exceeding this intention will be regarded as misuse. Under no circumstances shall HANS
SCHMIDT & Co GmbH be held liable for damage resulting from misuse.
The intended use also includes:
- Complying with all notices included in the Operating Instructions and observing all
inspection and maintenance works.
1.7 Dangers in Handling the Device
The device was designed according to the state of the art and the approved safety stan-
dards. Nevertheless, its use may cause serious or fatal injury to the user or third persons,
and/or an impairment of the device or of other material assets.
The device may only be applied:
- For its intended use in a faultless condition with regard to the safety requirements.
- Malfunctions that could impair safety must be remedied immediately.
- Personal protective equipment must be used according to the EC Directive 89/686/EEC.
The device must not be operated in potentially explosive areas and must not
come into contact with aggressive substances.
1.8 Copyright
The copyright on these Operating Instructions remains with the company
HANS SCHMIDT & Co GmbH.
These Operating Instructions are intended for the operating company and its personnel
only. They contain instructions and notices that may only be reproduced on the prior writ-
ten permission of
HANS SCHMIDT & Co GmbH
and under indication of the complete reference data.
Violations will be prosecuted.
1.9 EU Declaration of Conformity and WEEE Registration
In compliance with the EU Directive 2004/108/EG
HANS SCHMIDT & CO GmbH is registered in compliance with
the German Electrical and Electronic Equipment Act (ElektroG).

5
2 Available Models
These Operating Instructions refer to the DT-311N and DT-315N Models.
2.1 Specifications
Model DT-311N and DT-315N
INTERNAL Signal Mode (normal operation)
Flash Range: 0.7 - 585 Hz = 40.0 - 35000 rpm or FPM (flashes/min)
with automatic range control
Accuracy: ± 0.1% of reading, ± 1 digit
Resolution: With automatic range control
40.0 - 4999 rpm: ± 0.1 rpm
5000 - 7999 rpm: ± 0.2 rpm
8000 - 9999 rpm: ± 0.5 rpm
10000 - 35000 rpm: ± 1 rpm
Phase Shift: Use + / - push buttons (360° in 6 sec.)
Display: 5 digit LED, 10 mm high
Output Signal: Synchronous, 400 µs pulse width amplitude, 0 to +12 V DC
4.7 kΩoutput impedance
Rate Multiplier/Divider: Multiply by 2 / divide by 2 the current flash rate
EXTERNAL (Trigger) Signal Mode
Flash Range: 40.0 - 35000 rpm
Accuracy: ± 0.01%, ± 1 digit
Phase Shift: 0 - 359° (with 1° resolution)
Delay Time: 0 - 2000 µs from 40 - 10000 rpm
Input Trigger Signal: Hi level: 2.5 - 12 V DC,
Lo level: 0 - 0.8 V DC
Pulse width: 50 µs min.
Input impedance:Hi level: 4.7 kΩat 12 V,
Lo level: 6.8 kΩat 0 V
Triggering selectable from Lo to Hi edge or Hi to Lo edge
General
Light Intensity: Approx. 300 lux (frequency-dependent)
Display: 5 digit LED, 10 mm high,
Display Update: 0.2 sec.
Flash Tube Power/Life: Xenon, 10 W max. (100 million flashes)
Flash Duration: 10 - 40 µs
Output Signal Sensor: 12 V ± 0.6 V DC, 40 mA
Auto Power Off: Continuous or 1 - 120 min (user selectable)
Power Requirement: 230 V AC, 30 VA (DT-311N only)
Temperature Range: 5 - 45°C
Housing Material: Aluminium/ABS
Weight net (gross): 1200 g (1800 g)
Dimensions: 185 mm x 120 mm x 120 mm (L x W x H)

6
2.1 Specifications (Forts.)
Model DT-315N
Low Battery Indicator: Display shows all L’s
Power Requirement: Internal NiCd battery pack,
Capacity: ¾ hour continuous use
Charging voltage: 230 V AC, 30 VA
External Power Supply: 10.5 to 15 V, 2.3 A, stabilized 0.3 Vp·p
Weight, net (gross): 2000 g (3200 g)
Dimensions: 250 mm x 120 mm x 120 mm (L x W x H)
2.2 Delivery Includes
Model DT-311N:
1Instrument
1Connector plug for trigger signal
1Operating Instructions
Model DT-315N:
1Instrument
1AC adapter/charger
1Connector plug for trigger signal
1Operating Instructions
2.3 Unpacking
Unpack the tension meter and inspect it for any shipping damage.
Notices of defect must be filed immediately, at the latest within 10 days on receipt of the
goods.
3 Initial Setup and Operating Procedure
3.1 Notes Before Starting Measurement
Have you read and understood the Operating Instructions, in particular
Chapter 1 “Basic Safety Notices” ?
You are not permitted to operate the tension meter before doing so.
Before working with the instrument you must put on your personal protective
clothing, if necessary. For example, eye protectors, gloves, etc.
To avoid damage, do not move the center roller by hand.
Do not operate or store instrument in the following places:
Explosive areas; Near water, oil, dust, or chemicals; Areas where tempera-
ture is above 40°C.
Do not look at the emitted light for long periods of time; it can be harmful to
the eyes.
Use 1/4-20 UNC tripod knuckle screws of up to 8 mm length for the thread at
the bottom of the housing.
Charge the battery pack before first use (DT-315N only).
Do not disassemble or repair unit while in operation.

7
3.2 Connecting the Power Cord (DT-311N only)
Before connecting the power cord 16, ensure proper supply voltage (230 V).
Connection:
- Connect the power cord 16 to the power line.
3.2.1 Connecting the AC Adapter/Charger (DT-315N only)
The instrument is provided with a battery pack, allowing either battery-or line-operation.
For line-operation, use the AC adapter/charger as a power supply to power the strobe
continuously.
.1.1
Before connecting the AC adapter/charger, ensure proper supply
voltage (230 V).
No warranty or liability will be accepted for AC adapters/chargers
from other manufacturers.
Connection:
- Connect the AC adapter cord to the AC adapter connector 16.
3.2.2 Battery Charge (DT-315N only)
Before first use or if the display 1shows the battery needs to be recharged.
To charge the battery:
1. Turn the power switch 17 OFF.
2. Connect the AC charger to the instrument and to the power line.
Charge the unit only with the provided AC adapter/charger.
3. The B-CH LED 4will be lit during battery charge; within 2 hours the battery should
be charged completely and the LED 4should go out.
The built-in battery will only be charged when the stroboscope is off.
Charging the empty built-in battery will take about 2 hours.
The battery charge control of the AC adapter/charger will stop the charging
process as soon as the battery has been recharged completely.
3.2.3 Battery Change (DT-315N only)
The life of the built-in battery should last for
approximately 300 charges. If the time period
between recharges becomes increasingly
shorter, then replace battery with a new one.
Connector
Fixing screw
Battery
Connector
polarity fig. 3.2.1a

8
1 LED display Displays function and value
2LED EXT External mode indicator
3LED INT Internal mode indicator
4LED B-CH Battery charge indicator (DT-315N only)
5LED RPM Flashes per minute indicator
6LED deg Phase shift indicator
7LED mSec Millisecond indicator
8Signal switch Switches the unit from the external mode to the internal mode
(and vice-versa).
9Display mode switch When unit is set to the external mode, the strobe will switch to
one of the three options each time “MODE” is pressed:
rpm (FPM) Displays flashes per minute External
input 0 - 30000 rpm
deg Displays flash delay in degrees
msec Displays flash delay in msec
10 Setter Changes the flashing rate, delayed angle and delayed time.
11 x2 Switch In the internal mode, pressing “x2” doubles the flashing rate.
12 + Switch In the internal mode, when object appears to be standing still,
pressing “+” will give the illusion that the object is moving
owards the rotating direction at a speed of 1 rotation in
6 seconds.
13 ÷2 Switch In the internal mode, pressing “÷2” divides the flashing rate
by two
14 - Switch In the internal mode, when object appears to be standing still,
ressing “-” will give the illusion that the object is moving in
reverse at a speed of 1 rotation in 6 seconds.
15 Input and Output Connector PIN #1: +12 V (for powering sensor)
PIN #2: Sync output signal
PIN #3: External input signal
PIN #4: 0V (common)
16 Power cord (DT-311N)
AC Adapter (DT-315N)
17 Power switch
3.3 Operating Elements

9
3.3.1 True RPM Measurement
General:
Stroboscopes are highly stable industrial quality instruments for non-contact RPM mea-
surement as well as for inspection and observation of moving parts.
They give the operator the illusion of “stopped motion” where in actuality the equipment
under observation is in a moving state. By adjusting the flash rate, equipment in motion
appears to be standing still. With a slight adjustment, movement can be viewed in appar-
ent slow motion, which enables the operator or observer to study the process in action.
All stroboscopes can measure rotational (rpm) or reciprocating (strokes per minute)
speeds with the same high precision as with an electronic digital tachometer.
To measure true revolutions per minute (rpm):
1. “Mark” the object to be measured by either visually noting an inherent distinguishing
characteristic (such as a label, scratch, etc.) or physically marking the object with a
small piece of tape, pencil mark, etc.
2. Firmly plug in power cord.
3. Turn power switch on.
4. Turn setter from highest rpm downward.
5. The true rpm can be noted once the action appears frozen and the first single image
of the “mark” appears (see chart below and accompanying diagram for further
explanation).
6. To verify this, double the flash rate by pressing ; you then should see 2 images.
If the flash rate, however, is below the actual RPM value by 1/even num-bers, a
stopped motion with only one image will appear.
7. To verify rpm reading, press ; a single image should appear again.
Measuring higher RPM than the stroboscopes’ range using harmonics:
All instruments can be used also to measure higher RPM by using the images effect.
For example: - Range up to 20,000 rpm
- Rotating object 60,000 rpm
- Images 3 times seen
Shaft
Rotation
(rpm)
Flashes
(rpm)
Flashes/
rpm
Shaft
Stopped
Images
At
1500
rpm
6000 4 times 4
4500 3 times 3
300 2 times 2
1500 1 times 1
750 1/2 times 1
500 1/3 times 1

10
3.4 Measuring with the Stroboscope
3.4.1 Internal Signal Mode Normal operation
Operation without the trigger signal:
1. Firmly plug in the power cord.
2. Turn the power switch 17 ON.
3. If the INT indicator is not on, press ; the INT light will then turn on.
4. Aim light beam at object under observation. The optimal distance between strobe and
moving object is approximately 60 cm.
5. Measure rpm by turning the setter 10 to adjust the flashing rate to the rotational
speed of the object.
To achieve a particular rate quickly, use the or switches and then the
setter for fine tuning. When the object appears to be standing still, the measured
value is shown on the display 1.
Phase Shift:
When the object appears to be standing still, pressing or will give the illusion
that the object is moving towards or reverse the rotating direction at a speed of 1 rotation
in 6 seconds or in 1 degree steps.
If the Auto Power Off timer is used:
Once the internal timer has expired, the strobe will stop flashing and the display
will flash rapidly. To restart the strobe, turn power switch off, then on, and the
cycle will repeat. (see chapter 3.5).
Memory:
If the unit is powered off the last used frequency will be stored. When switched on
again, the stroboscope will start with the same frequency as powered off.
3.4.2 External Signal Mode
Operation with the trigger signal:
1. Solder the external trigger or sensor
wires to the supplied plug according
to the connector pin designation below
and insert the plug into the strobe
receptacle:
2. Firmly plug in the power cord.
3. Turn the power switch 17 ON.
4. If the EXT indicator is not on, press ; the EXT light will then turn on.
5. Press to select the proper mode.
Pin 1: +12 V
(for powering
sensor)
Pin 2:
Sync output signal Pin 4:
0 V (common)
Pin 3:
External
input signal

11
3.4.2.1 Delay Mode
rpm: Light will flash in correspondence with
input signal; the input signal will be
calculated into rpm and displayed.
deg: One cycle of input signal is 360°.
A delayed angle will be displayed from 0
up to 359°. (The delayed angle can be
changed by turning the setter as
previously described).
msec: The above delayed angle will
be displayed in msec.
If the input signal frequency exceeds upper or lower limits, the alarm dashes
()will be displayed and the strobe will stop flashing (see chapters
3.4.2.3 and 3.4.2.4).
If the Auto Power Off timer is used:
Once the internal timer has expired, the strobe will stop flashing and the display
will flash rapidly. To restart the strobe, turn power switch off, then on, and the
cycle will repeat. (see chapter 3.5)
3.4.2.2 RPM Display Mode
If the input signal exceeds 585 Hz, the upper dashes on the digital display
will be flashing: upper dashes
If the input signal is lower than 0.65 Hz, the lower dashes on the digital
display will be flashing: lower dashes
3.4.2.3 Deg/msec Display Mode
If the input signal exceeds 167 Hz, the upper dashes on the digital display
will be flashing:
If the input signal is lower than 0.67 Hz, the lower dashes on the digital
display will be flashing:
upper dashes msec
deg
deg lower dashes
msec

12
3.4.2.4 Synchronous Output Signal
For triggering and controlling additional stroboscopes,
the synchronous output signal is applied at pin #2
(see below).
3.5 Memory
The following parameters are set at the factory:
•Decimalpoint: autorange
•Internaltimer: continuous
•Externaltriggeredge: L-H(LotoHi)
These parameters can be changed in the field to facilitate different situations.
To change any of the above parameters, follow these steps:
1. Turn the power switch on.
2. Make sure that the INT lamp is on. If not, press until it turns on.
3. Change the desired memory parameter:
a. To change the decimal point:
Press and at the same time for approximately 2 seconds until the
display alternates between —1— and 0.0.
Press . The display will freeze and show 0.0.
Change the decimal point by pressing .
If 0.0 is selected the decimal point is in the autorange mode.
If 0 is selected the decimal point is eliminated throughout the entire range.
b. To change the internal timer (Auto Power Off):
Press . The display will alternate between —2— and 0;
Press . The display will freeze to 0.
Use the setter to set timer for power off anywhere between 1 and 120 minutes.
c. To change the trigger edge or the external signal mode:
Press . The display will alternate between —3— and L-H.
The external trigger edge is factory-set to occur during the positive transition of the
incoming pulse.
To change it to the negative transition:
Press . The display will change from L-H to H-L.

13
3.5 Memory (Cont.)
4. Press to go back to normal operation.
The above settings can be checked quickly by performing steps A to C as described
above and then pressing .
3.6 Troubleshooting
RPM reading is displayed but unit is not flashing:
•Flashtubemayneedtobereplaced(see„FlashTubeReplacement“section)
Stroboscope is in external signal mode, no flash:
•Checkflashtube.Replaceifnecessary
•Check for damaged wiring and/or loose pin connections
Stroboscope is in internal signal mode, no flash:
•Checkflashtube.Replaceifnecessary
•Checkfordamagedwiringand/orloosepinconnections

14
4 Service and Maintenance
Stroboscope is easy to maintain.
4.1 Flash Tube Replacement
When rpm reading is displayed but unit is not
flashing, flash tube may need to be replaced:
1. Unplug line cord from power line.
2. Turn power switch off (wait a few minutes
until stroboscope is cool before proceeding).
3. Remove protective window by removing the
4 screws (fig. 4.1a).
4. Use tube removing tool provided with the
pare tube:
Insert tool all the way and turn clock-wise
until tool unlocks (fig. 4.1b).
Pull out tube (fig. 4.1c and fig. 4.1d).
5. Install new flash tube using the removing
tool (in the opposite direction fig. 4.1d)
and turn counter-clockwise until tool locks (fig.4.1b).
6. Replace window (fig. 4.1a).
7. Mount reflector in the center so that the reflector
will not interfere with the screw spacer on the
corners.
fig. 4.1a
fig. 4.1b
fig. 4.1c
fig. 4.1d

15
5 Cleaning
For cleaning the unit, do not use any
AGGRESSIVE SOLVENTS
such as trichloroethylene or similar chemicals.
NO WARRANTY OR LIABILITY
shall be accepted for damage resulting from improper cleaning.
6 Correspondence
Should you have any questions regarding the instrument or Operating Instructions, or their
use, please indicate above all the following details which are given on the ID plate:
1) Model
2) Serial number
7 Repairs
Shipping instructions:
We kindly ask for return free of charge for us, if possible by airmail parcel. All occurring
charges, if any (such as freight, customs clearance, duty etc.), will be billed to customer.
For return from foreign countries, we ask you to include a proforma invoice with a low value
for customs clearance only, e.g. 50 Euro, each and to advise the shipment in advance by
fax or eMail.
To avoid unnecessary follow-up questions, and the resulting loss of time or
possible misunderstandings, please return the instrument with a detailed fault
description to our service department. Please indicate in your order whether you
require an calibration certificate with calibration report.
Service address: HANS SCHMIDT & Co GmbH
Schichtstr. 16
D-84478 Waldkraiburg
Germany

SCHMIDT-Test-Instruments
indispensable in production monitoring,
quality control and automation
We solve your measuring problems:
Tension Meter
Force Gauge
Torque Meter
Tachometer
Speed- and Lengthmeter
Electronic Lengthmeter
Stroboscope
Screen Printing Tension Meter
Thickness Gauge
Yarn Package Durometer and Shore-A Durometer
Sample Cutter
Balance
Moisture Meter
Leak Tester
Softometer
Mailing address:
P. O. B. 1154
84464 Waldkraiburg Germany
Shipping address:
Schichtstr. 16
84478 Waldkraiburg Germany
Hans Schmidt & Co GmbH
Phone:
int. + 49 / (0)8638 / 9410-0
Fax:
int. + 49 / (0)8638 / 4825
int. + 49 / (0)8638 / 67898
More than 60 years - Worldwide -
e-mail:
[email protected]
Internet:
http://www.hans-schmidt.com
S C H M I D T
c o n t r o l i n s t r u m e n t s