Part No: CEB-27FD44

Description: piezo electric diaphragm

Phone: 800.275.4899

Fax: 503.612.2381

www.cui.com

20050 SW 112th Ave.

Tualatin, OR 97062

Date: 6/25/2007

Unit: mm

Page No: 3 of 4

Environment Test

Item

Test Condition

High temp. test

After being placed in a chamber at +80°C for

240 hours.

Low temp. test

After being placed in a chamber at -30°C for

240 hours.

Humidity test

After being placed in a chamber at +40°C and

90±5% relative humidity for 240 hours.

Temp. cycle test

The part shall be subjected to 5 cycles. One

cycle will consist of:

Evaluation Standard

The diaphragm will be measured

after being placed at +25°C for 4

hours. The value of the

resonant frequency should be

±10%, the value of the electro

static capacitance should be

±20% compared to the initial

measurements. The resonant

impedance should be 2,000 Ω

max.

+80°C

+25°C

+25°C

-30°C

0.5hr 0.5hr 0.25 0.5hr

0.5hr

0.5hr 0.25

3hours

Test Conditions

Standard Test Condition

a) Tempurature: +5 ~ +35°C

b) Humidity: 45 - 85%

c) Pressure: 860-1060 mbar

Judgement Test Condition

a) Tempurature: +25 ±2°C

b) Humidity: 60 - 70%

c) Pressure: 860-1060 mbar