testo 476 Instruction manual en
Preface Foreword Dear Testo customer, Congratulations on choosing a Testo product. We hope that you will enjoy many years of using the product and that it will help you in your work. If problems should occur which you cannot rectify yourself, please consult our service department or your dealer. We will endeavour to provide fast and competent assistance to save you long periods out of operation. Copyright This documentation is subject to the copyright of Testo AG.
General Information This instruction manual contains important information about the features and use of the instrument. Please read this document carefully and familiarise yourself with the operation of the instrument before putting it to use. Always keep this manual close at hand in order to look up necessary information. Standards/Tests The conformity certificate confirms that this product fulfills the guidelines in accordance with 89 / 336 / EEC.
Contents Preface ..........................................................2 General Information ......................................2 Contents ........................................................4 1. Basic safety instructions ..............................5 2. Intended use ..................................................6 3. Delivery range ................................................6 4. Overview ........................................................7 5. Power supply .........................
1. Basic safety instructions WARNING: Stroboscopes give the illusion of stopped motion. Do not touch the machine or object being observed! The use of stroboscopes may induce an epileptic seizure in those persons predisposed to this type of attack. Explosion hazard. Do not use this product in the presence of an explosive environment. CAUTION: Do not use this product in wet or condensating environments. Do not allow liquids or metallic objects to enter into the ventilation holes.
2. Intended use You can use the testo 476 in a variety of industrial, laboratory, R&D and academic environments. Most commonly, the testo 476 is used to make objects which are moving at high speeds appear to be moving in slow motion. When this occurs, you can then safely and easily analyse their motion, check for proper registration, determine sources of unwanted vibration, etc. Also, you can use the testo 476 to apparently “freeze” an object’s movement.
4. Overview Close-up of LCD: Underside: ➆ ➃ ➁ ➅ ➂ ➀ ➈ ➇ ➄ ➀ On/Off ➁ Flash Adjustment Knob adjusts the flash rate. The speed with which the flash rate changes is controlled by how quickly the knob is rotated: Quick rotation = flash rate changes in large increments. Slow rotation = flash rate changes in small increments. ➂ LCD display shows flash rate (flashes per minute = FPM). ➃ Low Bat indicator will light up when the battery needs charging. ➄ Battery Charger Jack.
5. Power supply 5.1 Battery Charger Setup ➀ ➁ ➂ When first using the battery charger, select the appropriate plug connector for use in the AC power outlet (several styles provided). Align the holes in the rear side of the plug connector (➀) with the pins in the receptacle in the battery charger body (➁) and push. When properly seated, you will hear a click and the plug connector will not move. The charger is now ready for use.
5. Power supply 5.3 Battery management Several factors effect the battery life: - The warmer the operating environment, the shorter the battery life; the cooler the environment, the longer the battery life. - The more times the battery is completely drained, the shorter the battery life. To maximise the life of the battery: Keep the battery fully charged. Do not allow it to completely drain between charges. When storing the unit at room temperatures, charge / discharge it once every three months.
6. Operation ➂ ➁ ➀ 1 Be sure to charge the internal battery before first use. 2 Aim the testo 476 at the moving object and turn it on (➀). - There will be a delay of 1-2 seconds before the flash begins to operate. - If the LOW BAT symbol in the display is illuminated, charge the battery. 3 Adjust the flash rate by rotating the Flash Adjustment Knob (➁) until the object appears motionless (as you approach the movement frequency, the image appears to move more slowly).
7. Error messages Underside: E1: ➀ Front bezel is not fastened correctly. If the E1 message appears, the instrument must be switched off. Remove the front bezel screw, reseat the reflector and tighten the front bezel screw (➀). 8. External triggering The testo 476 can be externally triggered. EXT illuminates when External Trigger Jack is plugged. The EXTERNAL TRIGGER jack is DTL/ TTL compatible. It detects a square-wave signal of 0 to +5 volts which is at least 800nsec in duration.
9. Replacing the flash tube ➀ ➁ ➂ ➄ ➃ 1 Remove the front bezel screw located on the underside of the front bezel (➀). 2 Swing the bezel upwards and outward carefully (➁). Be sure not to break the old flash tube. Ensure that the bezel hooks on the top edge are released. Remove the bezel. 3 Firmly grasp the spent flash tube and pull it straight out (➂). 4 Using a lint and oil-free tissue, insert a new flash tube (➃) into the socket.
10. Application information 10.1 Slowing down motion As discussed, the primary use of the Pocket-Strobe is to slow down or “freeze” the apparent motion of moving objects. This allows you to analyse their run-time performances safely and easily. To make an object appear to move in slow motion, you need to strobe it at a rate slightly above or slightly below its actual speed (or any harmonic of its speed as discussed below).
10. Application information 10.2 Apparent direction of movement The direction (clockwise vs. counterclockwise or forward vs. backward) at which the object appears to move is determined by the flash rate, the object’s actual direction of movement and the orientation of the stroboscopic beam to the object. Example: Assume you wish to visibly slow down the movement of a fan which is rotating clockwise at 1,000 RPM.
10. Application information The image will appear to freeze again at 3,000 FPM. At this rate, the fan appears to be very bright. You can now use the FINE ADJUSTMENT knob to vary the rate above and below 3,000 to make the fan appear to move both clokkwise and counterclockwise. Helpful Hints: - Harmonic images appear at both whole number multiples as well as fractional intervals of the object’s actual rate.
10. Application information Example 1 (mark needed): This example shows why identifying marks are important. Suppose you want to determine the true RPM of this fan. The only thing you know is that its speed is less than 3,500 RPM. If you slowly decrease the flash rate starting from 3,500 FPM, the following “frozen” images appear: Image No.: 1 2 3 4 Flash Rate: 3,300 2,200 1,650 1,320 Image No.: 5 6 7 8 Flash Rate: 1100 825 733.
10. Application information Using the orientation mark, it is now clear that the images appearing at 3,300, 1,650 and 825 RPM are multipleimage harmonics. In each of these cases, three identification marks appear. On the other hand, a singular image appears at 1,100 and again at 550. Here, only one mark appears. Recall that “a singular image always appears at exactly one half of the object’s true RPM”. 550 is one half of 1,100. Therefore, the rate of the fan must be 1,100 RPM.
11. Maintenance Due to the high voltage contained within the testo 476, the user should not attempt to repair the device (exception: Replacing the flash tube, see p. 12). If your testo 476 needs repair, please contact the nearest Testo service point. Clean the external surfaces with a dry, lint free cloth only. Do not allow any liquids to enter into the instrument. 12.
13. Technical data Display Parameters Range Accuracy Resolution Repeatability Display Flash Tube Parameter Longevity Flash Duration Light Emission Flash Colour Flash Energy Electrical Specification Use Continuous Usage Time External Trigger Input Line Power Input for recharging Battery Recharging Time Overload protection / trickle charge Housing Material Dimensions Weight Ambient Conditions Ambient Temp. Storage Temp. Humidity Warranty 30...12,500FPM (flashes per minute) ±0.
testo AG Postfach 11 40, 79849 Lenzkirch Testo-Straße 1, 79853 Lenzkirch Telefon: (07653) 681-0 Fax: (07653) 681-100 E-Mail: info@testo.de Internet: http://www.testo.com 0971.4760/01/T/dr/18.03.
