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WEB SITE  www.hamamatsu.com

Information in this manual is current as of Oct. 2008. Specifications are subject to change without notice due to product improvement, etc.
For the latest information, please contact us at the address below.

HAMAMATSU PHOTONICS K. K., Electron Tube Division

314-5, Shimokanzo, Iwata City, Shizuoka Pref., 438-0193, Japan, Telephone: (81)539/62-5248, Fax: (81)539/62-2205

U.S.A.:

 Hamamatsu Corporation: 360 Foothill Road, P.O. Box 6910, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1)908-231-0960, Fax: (1)908-231-1218, E-mail: [email protected]

Germany:

 Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49)8152-375-0, Fax: (49)8152-2658, E-mail: [email protected]

France: 

Hamamatsu Photonics France S.A.R.L., 19, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: (33)1 69 53 71 00, Fax: (33)1 69 53 71 10, E-mail: [email protected]

United Kingdom:

 Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire AL7 1BW, United Kingdom, Telephone: 44-(0)1707-294888, Fax: 44-(0)1707-325777, E-mail: [email protected]

North Europe:

 Hamamatsu Photonics Norden AB: Smidesvagän 12, SE-171-41 SOLNA, Sweden, Telephone: (46)8-509-031-00, Fax: (46)8-509-031-01, E-mail: [email protected]

Italy:

 Hamamatsu Photonics Italia S.R.L.: Strada della Moia, 1/E 20020 Arese (Milano), Italy, Telephone: (39)02-935 81 733, Fax: (39)02-935 81 741, E-mail: [email protected]

TPT 9001E02

JAN. 2009

 WD

PRECAUTIONS WHEN USING THE UVTRON

(1)  Installation

When the UVTRON discharges, it emits ultraviolet radiation. If two or more UVTRONs are used in close 
proximity, they must be arranged so that they will not interfere with each other optically.

(2)  Humidity

Humidity around the UVTRON leads may cause leak current, dropping the anode voltage and stopping the 
UVTRON from operating. In particular, if dirt or dust gets on the leads, it easily absorbs moisture, so keep the area 
around the leads clean.

(3)  Dirt on the window

Since the UVTRON operates at high voltage, static electricity causes dust to build up on the surface of the glass 
bulb. This will lower the ultraviolet transmittance and UVTRON sensitivity, so periodic inspection and mainte-
nance is necessary, such as wiping off with gauze moistened with alcohol.

(4)  Soldering

When mounting the UVTRON on a printed circuit board, solder the leads quickly (soldering iron tip temperature: 
350°C for less than 5 seconds). If the leads are heated excessively, the glass may crack or the UVTRON 
characteristics deteriorate. After soldering, wipe away the solder flux with alcohol, etc. The flux residue absorbs 
moisture which may cause current leak, dropping the UVTRON supply voltage and stopping the operation. When 
using a UVTRON with hard pins, use the mating sockets available from Hamamatsu Photonics.

(5)  Vibration and shock

The UVTRON is designed to pass vibration and shock tests in compliance with IEC 60068-2-6 (sinusoidal 
vibration test – R9454, R9533: 3.0 mm peak to peak, 200 m/s

2

,10 Hz to 2000 Hz; other types: 1.5 mm peak to 

peak, 100 m/s

2

, 10 to 500 Hz) and IEC 60068-2-27 (shock test - R9454, R9533: 10000 m/s

2

, 1 ms; other types: 

1000 m/s

2

, 11 ms). However, if the UVTRON is subjected to excessive shock such as dropping, the glass bulb may 

crack or the internal electrode may be deformed, resulting in poor electrical characteristics. So use extreme caution 
when handling the UVTRON.

(6)  Polarity

The UVTRON has a cathode and an anode, so connect them with correct polarity. Reverse polarity connection 
causes malfunction or breakdown.

Summary of Contents for UVTRON

Page 1: ...TECHNICAL INFORMATION How to Use UVTRON...

Page 2: ...ensity of a gas burner flame city gas tungsten lamp and the sunlight on the earth s surface along with UVTRON spectral response characteristics As this figure shows the UVTRON has no sensitivity in th...

Page 3: ...Meanwhile the positive ions are accelerated towards the cathode and the resulting collisions with the cathode generate a great number of secondary electrons As this cycle is repeated a large current...

Page 4: ...R and C2 Point e The charge on C1 is exhausted the anode voltage falls below the discharge sustaining voltage Vs and the discharge stops The anode voltage does not recover until the next charge Durin...

Page 5: ...next point that must be considered is the background BG The BG is caused by sporadic discharges that occur due to radiation such as cosmic rays and static electricity even if no ultraviolet light ent...

Page 6: ...is generated to the output circuit and the counter is reset Point d At the output circuit the output pulses from the counter are lengthened to the necessary time interval T2 and are output 1 Figure 8...

Page 7: ...igure 8 Operation Time Chart for Signal Processing Circuit SUPPLY VOLTAGE AND SENSITIVITY Figure 9 shows a typical relation between the supply voltage and the UVTRON sensitivity The UVTRON is more sen...

Page 8: ...nterfere with each other optically 2 Humidity Humidity around the UVTRON leads may cause leak current dropping the anode voltage and stopping the UVTRON from operating In particular if dirt or dust ge...

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