MCP-PMTs R3809U-50 SERIES

PRECAUTIONS FOR PROPER OPERATION

Handling on set-up

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The photomultiplier tube (PMT) is a glass product under high vacuum. EXCESSIVE PRESSURE, VIBRATIONS OR

SHOCKS TO THE TUBE FROM THE SURROUNDING COULD CAUSE A PERMANENT DAMAGE. Please pay special

attention on insuring proper handling.

DO NOT PLACE ANY OBJECTS OF GROUND POTENTIAL CLOSER THAN 5mm TO THE PHOTOCATHODE WINDOW

when negative high voltage is applied to the photocathode. It could generate extra noise and damage the photocathode

permanently.

DO NOT EXPOSE THE PHOTOCATHODE TO SUNLIGHT DIRECTLY and any light stronger than the room light even

during of no operation.

NEVER TOUCH THE INPUT WINDOW WITH YOUR BARE HANDS. In case the window contaminated by dust or grease,

wipe it off using alcohol and a soft cloth or dust free tissue.

DO NOT OPERATE OR STORE IN A PLACE OF UNSPECIFIED TEMPERATURE AND HUMIDITY.

Supplying high voltage

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DO NOT SUPPLY ANY VOLTAGE HIGHER THAN SPECIFIED. Also make sure the output current does NOT EXCEED

THE MAXIMUM CURRENT specified.

This device is very sensitive even with weak light input. When applying high voltage to the tube, GRADUALLY (IDEALLY

100 Vdc STEP BUT 500 Vdc STEP IS OK) AND CAREFULLY INCREASE THE VOLTAGE while monitoring the output using

an ammeter or oscilloscope. Also make sure before use that the polarity of the applied voltage is correct.

DO NOT REMOVE OR CONNECT ANY INPUT OR OUTPUT CABLES WHILE HIGH VOLTAGE IS APPLIED. If a high

voltage is applied when its output is opened, DO NOT CONNECT ANY READOUT CIRCUIT TO THE TUBE IMMEDIATELY

after turning the high voltage off. Ground the anode of the tube before connecting in order to avoid possible damage to the

readout circuit due to an excessive electron charge flowing from its anode.

IT IS RECOMMENDED TO TURN HIGH VOLTAGE OFF WHILE NOT BEING USED FOR MEASUREMENTS. This is to

avoid shortening its period of life time as well as a risk of damage due to an exposure of excessive incident light.

Incident light amount

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KEEP THE INCIDENT LIGHT AMOUNT AS LOWS AS POSSIBLE to extend its period of life time.

In a case of photon counting application, it is recommended to KEEP THE SIGNAL COUNT RATE LESS THAN 20kcps.

ILLUMINATE PHOTOCATHODE EFFECTIVE AREA AS LARGE AS POSSIBLE to keep better linearity characteristics and

avoid an excessive stress in partial area, which may result in a reduction of sensitivity partially.

Usage in vacuum

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DO NOT USE A PMT AS AN INTERFACE BETWEEN VACUUM AND ENVIRONMENTAL PRESSURE.

Standard MCP-PMT is not designed for vacuum-tight construction.

KEEP THE TUBE CLEAN. Unless otherwise, it would cause outgassing in a vacuum.

DO NOT SUPPLY HIGH VOLTAGE UNLESS THE VACUUM LEVEL REACHES 1

DO NOT PROCEED BAKING VACUUM INSTRUMENTS WHILE THE TUBE IS PLACED INSIDE.

OTHERS

1) If the tube won't be used with a cooler, it is recommended to LEAVE THE TUBE IN DARKNESS (YOUR INSTRUMENT

WITHOUT ANY INPUT LIGHT) FOR 30 MINUTES OR SO before start any measurements because it occasionally takes a

little while until its dark noise settles down.

WARRANTY

The detectors indicated in this data sheet are warranted to the original purchaser for a period of 12 MONTHS following the date

of shipment. The warranty is limited to repair or replacement of any defective material due to defects in workmanship or

materials used in manufacture.

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Any claim for damage of shipment must be made directly to the delivering carrier within five days.

Customer must inspect and test all detectors within 30 days after shipment. Failure to accomplish said incoming inspection

shall limit all claims to 75% of invoice value.

No credit will be issued for broken detector unless in the opinion of Hamamatsu the damage is due to a manufacturing defect.

No credit will be issued for any detector which in the judgement of Hamamatsu has been damaged, abused, modified or

whose serial number or type number have been obliterated or defaced.

No detector will be accepted for return unless permission has been obtaind from Hamamatsu in writing, the shipment has

been returned repaired and insured, the detector is packed in their original box and accompanied by the original data sheet

furnished to the customer with the tube, and a full written explanation of the reason for rejection of detector.