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"NOTIC€t When Government or other drawings, specifications or

other data are used for any purpose other than in connection with

a definitely related Government procurement operation, the U.S. Government thereby incurs no responsibility, nor any obligation

, whatsoever! and the fact that the Government may have formulated,

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sell any patented invention that may in any way be related thereto."

NEW WRK ' CHICAGO

.O.TON o r N V C R HO8OKSN D A L L A S

HOBOKEN, N. J. TELEPHONE HOBOKEN -1 bb

PHIIADS-MU WILMINQTOH PRWIDCNCS. WS A N O W M O M P H I . SAN ANOSLO

TASK 14

C r - \. ,. TEMPERATURE-HUMIDITY TESTS d . SIGNAL CORPS ENQINEERINQ LABORATOmES

r CONTRACT NO DA -36 -039 sc -63088 $ ( - PILE NO. 218-PH-54-91 (3430)

CL JULY 1, 1954 -JUNE 30,- 1957

W. Maron Project Engineer

Approved by L .J . ?& L. J . Perenic Mgr., Electronics Div.

TEXT:

1, Foreword

2. Purpose

3. Summary

4. Discussion

5. Results

6, References

APPENDIX:

TABLE OF CONTENTS

PAGE

5

5

5

6

16

16

Fig. 1 Recorded chart of conditions within humidity cham- ber during test series A for 24-hour period.

Fig. 2 Recorded chart of conditions within humidity cham- ber during test series C for 24-hour period.

Pig. 3 Recorded chart of conditions within humidity cham- ber during test series J for 24-hour period.

Fig. 4 Physical appearance of components tested.

Fig. 5 Jig for yarded insulation resistance measurements.

Fig. 6 Graphic presentation of test series A measurement intervals.

Fig. 7 Graphic presentation of test series C measurement intervals.

Fig. 8 Interior view of standard recovery condition cabinet.

Fig. 9 Exterior view of standard recovery condition cabinet .

In order to achieve standardization of electronic compone_nts among various countries -y to performtests £romy - - - .

which specifications can ultimately be- written. As there is considerable disparity between countries with regard to climate, laboratories, methods, and standards it was necessary to perform tests on similar components in various laboratories to determine to what degree correlation could be attained.

- '\?RPoSE : he purpose of this report is to present the results of three

different humidity_ cycles on capacitors and r r,-

- rious manufacturers in several countries hm technf ques , and instrumentation are-described.

3 . SUMMARY: \ ~ 1 . i . \ This report presents--infoxmation- en c~axponentr)~ subjected to

10 days of humidity cycling in accordance with Method 106 of Specification MIL-STD-202, modified; 84 days of humkqity cycling in accordance with test C, Clause 4.3. of IEC publication,No. 68; and 84 days of humidity cycling of a modified IEC test.7he de- tailed description of the tests, techniques, and instrumentation, together with the test results data will permit comparison with the findings of other laboratories.? :

DISCUSSION

B. Equipment Used (cont 'd) . Equipment

Precis ion Capacitor

Standard Sig- n a l Generator

Osc i l l a to r

Amp1 i f i e r and Null Detector

Tuned Ci rcu i t

Megohm Bridge - Oscilloscope

Receiver

Power Supply, Regulated, DC

VTVM-VOM

Humidicator

Wheats tone Bridge

Galvanometer

Humidity Chamber

Humidity Chamber

Standard Re- covery Condi- t i o n Cabinet

Manufacturer

General Radio

General Radio

General Radio

General Radio

General Radio

General Radio

Dumont

H a l l i c r a f t e r

Oregon

T r i p l e t t

Weston

Co .

Co.

Co . Co . Co . Co.

Leeds & Northrup

Mode 1 - 722-D

1001-A

1302-A

1231-8

1231-P2

544-3

274-A

SX- 28

06

631

8704

4725

Brown Instrument Co. 104 WIG

American Instrument 4-3475 Company, Inc.

American Instrument 4-3475 Company, Inc .

S e r i a l No.

4663

1883

531

1209

1633

1437

410

HA110 7 7

1085

- -

1048361

1055

K-9982A

K-9982B

United S t a t e 3 Test ing -- Co .

4 , DISCUSSION:

A. Types of Components.

The following a r e the types of.component8 t h a t were t ee t ed and the country of the suppl ie rs :

Type of Component Countr of T SUPP Y

I Sealed a) Paper c a ~ a c i t o r s (metal wi th g lass ) USA b) Paper capaci tors (metal with

neoprene) UK

I1 P a r t i a l l y sealed Paper capaci tors (phenolic moulding) USA

I11 Coated a ) Ceramic capac i tors (painted) Netherlands b) Ceramic capac i tors (phenolic coating) UK c) Paper capac i tors (wax dipped) UK d) Res is tors (cracked carbon, lacquer France

coating)

The r a t ed values of these components a re :

Paper capac i to ts : Ia - .047 uF, 400 v o l t s . I b - .05 UF, 500 v o l t s . I1 - .0068 uF, 500 v o l t s . I I I c - .05 uF, 500 v o l t s .

Ceramic capac i tors ( I I I a and I I I b ) : 100 pF, 500 v o l t s .

Res is tors ( I I Id) : 470,000 ohms, 1/2 wat t .

Equipment Used.

The following equipment and instruments were used f o r the t e s t s :

Equipment Manufacturer Model S e r i a l No. Capacitance Bridge General Radio Co. 716-CS1 1754

Capacitance Bridge General Radio Co, 716-C 1604

- 6 -

DISCUSSION

B. Equipment Used (cont 'd) . Equipment Manufacturer Model -

722-D

100 1 -A

1302- A

1231-B

1231-P2

544-B

274-A

SX- 28

D6

631

8704

4725

Serial No.

Precision Capacitor General Radio Co.

Standard Sig- nal Generator General Radio Co.

General Radio Co. Oscillator

Amplifier and Null Detector General Radio Co.

General Radio Co.

General Radio Co.

Dumont

Hallicrafter

Tuned Circuit

Megohm Bridge

Oscilloscope

Receiver

Power Supply, Regulated, DC Oregon

Triplett

Weston Humidicator

Wheatstone Bridge Leeds & Northrup

Galvanometer. Brown Instrument Co. 104 WIG

American Instrument 4-3475 Company, Inc.

American Instrument 4-3475 Company, Inc .

Huplidity Chamber

Humidity Chamber

Standard Re- covery Condi- tion Cabinet

DISCUSSION

C. Test Conditions,

1. Test series A. In accordance with test C, clause 4.3 of IEC publication No. 68.

a. In the chamber for this test it was possible to vary the temperature in any region where the components were placed, especially between 3S0c .L~OC. and 2S°C. f ~ O C .

b. The upper temperature was maintained for 12 hours and the lower temperature for not less than 5 hours, the complete cycle raking 24 hours.

c. The relative humidity during the period of main- tained elevated temperature was between 95 and 100 per cent.

d. ~igure 1 in the appendix is a chart on which was recorded the conditions-within the chamber for a representative 24-hour period.

e. The components were subjected to this tesc for 84 days.

2. Test series C. Modified IEC test.

a. In the chamber for this test it was possible to vary the temperature in any region where the components were placed, especially between 40°C - f 2'~. and 30°c. f 2'~.

b. The upper temperature was m~intained for 12 hours and the lower temperature for not less than 5 hours, the complete cycle taking 24 hours.

c. The relative humidity during the period of Gin- ; tained elevated temperature was between 95 and 100 per cent.

d. Figure 2 in the appendix is a chart on which was recorded the conditionr-within the chamber for a representative 24-hour period.

e. The components were subjected to this test for 84 days.

DISCUSSION

C. Test Conditions ( c o n t ' d l

3. Test s e r i e s J. In accordmcc with Method 106 of - - - -

MIL-sTD-202, modified . s ~

a . I n the chamber f o r ti& t e s t i t w a s poss ib le t o vary the temperature i n any region where the components were placed, especial ly between 6S0c ~ O C and 25O~ f ~ O C .

b. The da i ly humidity cyc le following s teps: - MU-+-CQ..~.& *r

4. f s t e p 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6. \

4-1/2 hours a t 6 5 ° ~ . k 2 0 ~ . and a r e l a t i v e humidity of 90 t o 95 per cen t .

2 hours cool ing t o 25Oc.f S°C. and a . r e l a t i v e humidity of 90 t o 95 per cent .

2-1/2 hours a t .250QS°C. and a r e l a t i v e humidity of 90 t o 95 per cent .

4-1/2 hours a t 6 5 ° ~ , f 2 0 ~ . and a r e l a t i v e humidity of 90 t o 95 per cent . The tem- pera ture w a s r a i sed t o t h i s value as rapid ly as possible..

2 hours cooling t o 2 ~ ~ c . f i ~ C . and a r e l a t i v e humidity of 90 t o 95 per cent .

8-1/2 hours a t 2 5 ° ~ . f 5 0 ~ . and a r e l a t i v e humidity of 90 t o 95 pe r cen t ,

c . Figure 3 i n the appendix is a c h a r t on which was recorded the co ns-within the chamber f o r a repraeenta t ive

I I 24-hour period.

:I I

d. The components were ~ u b j e c t e d t o t h i s test f o r 10 days,

D. Number of ~onponente Teated.

The following a r e the number of each type component t e s t e d :

DISCUSSION

D. Number of Components Tested (cont 'd) .

Test Series Component I a I b 11. I I I a I I I b -1 I Ic I I I d

A 15 15 15 15 15 . 15 15 C 15 15 15 15 15 15 15 9 . 10 10 10 10 10 10 9

E, Identif icat ion.

1. Sample ident i f ica t ion .

Each component was prwided with a numbered t ag which remained legible during the whole t e s t . For t e s t s e r i e s A the components were s e r i a l l y numbered from 31 through 45, f o r . t e s t a e r i e s C from 46 through 60, and f o r t e s t s e r i e s J from 61 through 70. The phyeical appearance of each type component is I l l u s t r a t e d : i n Fig. 4 of the appendix. -

2. Data sheet ident i f ica t ion .

The resu l t s of t e s t s of each component type a r e con- tained on two data sheets (only one sheet f o r I I I d ) . An example of the sheet designation is given below:

Sheet No. 1a/A/1, means:

Type of component: I a = Paper capaci tor , metal with g lass sea l .

Test se r i es : A = I n accordance with Test C , Clause 4.3. of I E C publica- t ion No. 68.

Ser ia l number: F i r s t sheet giving capacitance (column A) and tangent of l o s s angle (column 8 ) .

NOTE: I n order t o f a c i l i t a t e the comparison of a l l r e s u l t s the sheets on which capacitance plus tangent of l o s s angle (or reeistance) are given were numbered 1 and the sheets f o r insulat ion res is tance were numbered 2.

. ,

DISCUSSION

F. Measuring Methods,

1. h e capacitance value and the tangent of lose angle of paper capacitors were measured at 1000 cycles per second. Special clips were used for attaching the capacitors to the measuring terminals of the bridge, The same polarity was always used.

2, The capacitance value and the tangent of loss angle of ceramic capacitors were measured at 990 kilocycles per second. The length and position of the leads were kept the same during all the measurements so as not to influence the results of the measurements. Special clips were used for attaching the capaci- tors to the wasuring terminals of the bridge. All interconnect- ing leads were maintained as close to the original position as possible.

3, The insulation resistance between terminals was meas- ured with full rated voltage. The voltage was applied at once through the internal resistance of the test apparatus. The ca- pacitor was charged for 20 seconds and the test instrument was balanced at the end of an additional 10 seconds. To determine the insulation resistance between the terminals and the case the same procedure was followed, except that the charging time was only 10 seconds and the balancing time 5 seconds. When measuring tha insulation resistance between terminals (T-T) of capacitors encased in metal a guard circuit was used. A achematic of the circuit, the special jig, and explanation are given in Fig, - 5 of the appendix.

4, The resistance values of the resistors were measured with a DC voltage of 90 volts. The t h e of voltage application was kept to five seconds or less. During the few instances when the five second time limit was exceeded the resistor was allowed to cool off before the voltage was reapplied for making the meas- urement.

5. The same instruments were used for making the meas- urements during the entire test period. This obviated the pos- sibility of slight differences between instruments from influenc- ing the measurements. The instruments were calibrated periodi- odically during the test period to assure accuracy of measurements.

F. Measuring Methods (contfd) .

6. Whenever the r e l a t i ve humidity i n the laboratory ex- ceeded 75 per cent, measurements were made i n an a i r conditioned q i room. In some instances ce r ta in measuring equipment was already located i n a i r conditioned rooms. , I n such instances al1,meaeure- 1

aients were performed i n thess rooms, regardless of the r e l a t i ve 1 humidity i n the laborat'ory .

7. The temperature and re la t ive humidity a t each'meas- urement time are given on the data sheets.

Measurements . . . Before, During, and After the Temperature Humidity cycle.

1. Intervals of measurements.

a . The components were inserted and removed from the temperature and humidity chamber and measured a t the in te rva l s specif ied i n Figures - 6 and 1 i n the appendix.

b. For t e s t s e r i e s A and C the components were re- moved from the chamber 7 t o 8 hours a f t e r the heat was switched o f f , After removal from the chamber the components were then exposed for one hour t o the atmospheric conditions fo r recovery.

c. h e atmospheric conditions fo r recovery were maintained as follows:

Temperature ; 20'~. f 2'~. Relative humidity: 75 per cent f 2 per cent

These conditions were achieved by constructing a cubical box with sides 600 millimeters long, The f loor of the box was covered with a s t a in l e s s s t e e l t r ay containing sodium chloride (not common s a l t ) , which was occasionally sprinkled with water. The surface of the sodium chloride was k e p t moist, and care was taken tha t it wag not flooded with water. The components t o be conditioned were placed on a shelf half-way up the box. A i r w a s circulated by means 0 f . a small fan over the t ray , up through holes cut a t two corners of the ohelf, over the samples and down through holes a t the.-oppoeite corners of the shel f . The motor of the fan was placed on the outs'ide of the box to prevent heat from ra is ing the temperature within the box, The r e l a t i ve humidity

DISCUSSION

G. Measurements Before. Durinn and After the Temerature and Humidity cycle (cont 'd) ,

was measured by wet-and-dry bulb thermometers, The box was kept in an area in which the ambient temperature was maintained at approximately 20°c. Figures 8 and 9 in the appendix are interior - and exterior views of the box.

2. Parameters measured.

a, Initial measurements were made on each type of component prior to the start of the test.

b. The measurements consisted of measuring capaci- tance, tangent of loss angle, and terminal-to-terminal (T-T) insulation resistance. Capacitors encased in metal were also measured for insulation resistance from terminals-to-case (T-C). Resistors were measured for resistance only.

c. The measurements made at each scheduled removal from the chamber were the same as in b, above.

d. The final measurements for each type of component were the same as in b, above.

e. The only exception to c, above, was in test series 9. Each component in this test series waa measured after three 24-hour cycles. The components were removed from the chamber and measured as rapidly as possible to determine the value of insula- tion resistance with conditions as close as possible to those in the chamber, Droplets of water were not shaken off nor vere the eamples placed in the chamber in which atmospheric conditions for recovery were maintained as described in paragraph G-1-c, -

H, Identification of Temperature-Humidity Chambers.

1. As test series A and 9 were started simultaneously, asld test series X was still in progress when test aeries C was started (at the conclusion of test series J) it was not feasible t o perform all testa in the same temperature-humidity chamber.

2. The temperature-humidity chambers used for the teats were made by the American Instrument Company, Inc., Model 4-3475,

I DISCUSSION

I Ha Identification of Temperature-Humidity Chambers (cont'd).

i ! with Taylor No. 145KR program controllers. These chambers have i I a temperature range of 4.44O~. to 7loc. and a humidity range of

10 to over 95 per cent. The dimensisns of the working space I

within the test chambere are 1117 am. by 990 m. by 482 mm.

3. Figures L, 2, and 3 in the appendix are charts on which were recorded the-atrnosp~eric conditions within the cham- bers for s representative 24-hour period during test series A, C, and J,

4, Test series A components were in temperature-hum- idity chamber Serial No. K9982A, ~ h i l e test series C and J were in temperature-humidity chamber Serial No. K-9982B (not simul- taneously) .

5. The chamber8 were last calibrated on February 16, 1956. The interval between calibration is nominally six months.

I. Fonnat for Presentation of Measurement Results.

1. All results were entered on data sheets as described in paragraph E-2.

2. All initial measurement values were given in actual measured values.

3. All subsequent measurement results, including final measurements, were given as described below.

a. For components bearing code Ia and Ib the per cent change of the capacitance and tangent of loss angle from the initial values were given. The insulation resistance was given in actual values.

b. For components bearing code I1 and IIIc per cent change of the capacitance, tangent of loss angle, and in- sulation resistance (T-T) from the initial values were given.

DISCUSSION

I. orm mat f o r Presentat ion of Measurement Resul ts (cont 'd ) ,

per cent change (T-T) from the

For components bearing code XIIa and 1I . lb the, of the capacitance and insu la t ion r e s i s t ance

i n i t i a l values were given. The tangent of t he l o a s angle was given i n a c t u a l values.

d. For components bearing code I I I d the change i n r e s i s t ance was given a s the per cent change from the i n i t i a l . value a.

J. Removal from Test .

1. Components bearing code Ia, I b , 11, and I I I c were remwed from t e s t when the insu la t ion r e s i s t ance (T-T) dropped beluw 10 megohms.

2. Components bearing code I I I a and I I I b were removed from t e s t when the insula t ion r e s i s t ance (T-T) dropped below 100 meg0tl.m.

3. Components bearing code I I I d were removed from t e s t when the component became open-circuited.

K. ~ e t a i l s of changes i n schedule and o the r occurrences.

1. A l l t e s t s e r i e s s t a r t e d and f in ished on schedule.

2. Components bearing code Ib/A and scheduled f o r meas- urements on May 30, 1956 and Ju ly 4, 1956 ( i n add i t ion t o o the r da tes) were instead measured on May 29, 1956 and Ju ly 5, 1956. May 30th and July 4th were l e g a l holidays.

3. Components bearing code I ~ / J were measured a f t e r t h e ' f i f t h 24-hour, cycle, ins tead of a f t e r the t h i r d 24-hour cycle . The t h i r d cycle occurred on a Saturday.

4 , Components bearing code II/J were measured af ts l r t he fou r th 24-hour cycle, ins tead of a f t e r the t h i r d 24-hour cycle . The t h i r d cycle occurred on a h n d a y . Component 1 1 / ~ / 6 8 had t r a c e s of o i l on the body and was probably the r e s u l t of a leak i n the sea l . ~ h - i s was found during measurements at t e r t he fou r th cycle . It seemed t o have no e f f e c t on the component surviving t e s t s e r i e s J. - 15 -

DISCUSSION

K. Details of Changes in Schedule and Other Occurrence8 (contld). - 5 , Throughout the entire test period the insulation re-

si~tanca (T-T) of components bearing code 1a/A were erratic, The indicating galvanometer fluctuated rapidly and many times the ink eulsation resistance apparently was beyond the infinity mark of the test instrument. The fault was not in the instrument as other capacitor8 that were masured immediately after these occurrences on the same instrument were stable. Measurements were made with and without the guard circuit with similar erratic results. .

6. After one week in the temperature-humidity chamber nine of the fifteen components bearing code 1b/A had their metal cases tarnished from five to thirty per cent (area). At the end of the second week the remainder of the cases were tarnished approximately the same amount, At the end of the test period all il cases were tarnished 80 to 100 per cent (area). a d

i 1 7. Component IIIa/A/36 had one end broken off, beyond

the wire lead, at the start of the test. Component 111a/A/37 had T

a chip out of the paint at the start. These flaws apparently had t

no effect on the survival of the components. i" -.

8. After the third week component 111d/~/36 developed a loose lead. This apparently had no effect on the component as -

{ 1 measurements during the remainder of the scheduled test period -. showed normal behaviour as compared to the other components of the Same type. 11

t - i 5 . RESULTS: i -. 11

The results of the tests are presented on data sheets in the ( appendix. I

6. REFERENCES:

1. Publication No. 68 (First Edition) of the International Electrotechnical Comission,

2. Publication 40(W-G)1 of the International Electrotechni- cal Cornmiasion; Technical Committee No. 40: Electronic ~omponents,'WGrking Group: Revision Publication No. 68.

Fieure 1. Recorded chart of conditions within humidity chanber during t e s t s e r i e s A for 24-hour period.

F i e r e 3 . Recorded chart o f cor~di t ions within humidity chamber during t e s t s e r i e s C for 24-hour period.

l a - PAPER CAPACI.TOR (Metr l w i t h Qlass Seal )

I b - PAPER CAPACI TOR (Metal with neoprene Sea l )

I1 - PAPER CAPACITOR (Phenolic Moulding)

l l l a - CERAMIC CAPACITOR (Paln ted)

l l l b - CERAMIC CAPACITOR (Phenol l c Coating)

l l l c - PAPER CAPACITOR (Wax Dipped)

l l l d - RESISTOR (Cracked Carbcn,

Laquer Coating)

F i g re 4. Phys ica l appearance o f components

The two terminal c l i p s ore arounted orr individoel b l&r o f te f lon which Qr0 eccured to a copper base plate. A bra81 bar reOarat8u these tef lon blocks and i s bolted to tbe bare plate. Three plugs are vositionad to f i t the tes t jrdrr on the PI ha bridge. The high and IOU electmder are coaasct- W b E a v co Per l e d 8 to thai r respective temimal c l l o r

, did are fnmfated fm the baee plate. Tbe ard elect- . rod. ir recured to the base alate end i e s-&. The tea t r m p l e i s vlnced In M e .tewincal c l i p s m d r i td

d.c. wl t a w ir awl led across the caplteltor tewi .nalr Since tke toa tsrmiaels are separated by the grounded b r m r bar, there i 8 no ssi b i l i t f o r any leaka e reei s t m m bet#sa the h i * andToa tes t ~ e m i n a l a m d d e r o w i t a n t l n u l s t i o n reaiotmce woruraacat i r tha t e t t i ra l lp e x l r t i s g kbnaa the two tem lna l r o f tbe .caoaci tor.

0 -

ID-

a-

- _ -

a-

3-

Figure 8 . [ n t e r i o r view of standard recovery condi t ion cabinet

lnt~nutlonel Eleclrol~chnlcel Commlsslon Trchnlcel Commlncm No. 4 0 Elmclrmlc Corrqronontm .

Worklng-~roup: Revlslon Publlcrtlon No. 68

TEST REPORT iimnldllv 1.m1 l a ComvmaNs

IEC 40 (WC) I; Appeadlr IV

lntenutionsi Electmtschnicd Commlaslm Technical Commlnee No. 40 Elsctrmlc Co-enlr

I s l e e t NO. I I /A/2 Worldnegroup: Revialon Publlcalon No. 68

I TEST REPORT

I I 1 I I I I I I I I 1 I I I I ~ c ~ c t . i f not epplicnblc.

T = unblent tempsrmtrm In laboratory. RH= m ~ a t ~ v e h m ~ d ~ t y ~n ~s&o?aton

A = I NSULAT I ON RES. ; vnlt: MEGOHMS X 1 0) B = ; Unlt;

Tast ~ . b t w y : UNITED ! ~ r p o of C o r n p a d : CERAMIC

b l i d m a s 1.1 mcrr

'&:~:5/4/5i k t - : 5 / 7 / 5 6 k 2 I '+ ~ ~ 5 0 7.b: 24% U H A 7%

A 1 B 1 A % ] B

TEST R-RT HraldItY (8.1 fW CcUEValO88U

rATES TEST I NG CO. I NC, C- U.S.A.

IlXr n h t l v m buraldlly trr loboxlmyb

,_-- I-.. .-a 1 . i

1--"1 L-' . UII, )Il..1w b- (q ,- - , - 1 . I . * I , . " , a , , . . . . . . s , ' - H, b 4 4-4

IEC 40 (WG) 1: A p w n i i r IV

Lnt*rnaliond ELectrolocMc8l Cornmiadon I sheet NO. 1 1 1 C I A / I Technical Commltfec No. 40 ElocUonic Co-onts

Workmo-group: Revrskm Publication No. 68

IEC 40 (WC) 1: Appendix I V

Int-rnatirmaJ E b c t m t c c h n i c l l Comml..i.m T c c h n i c d Commit~.c No. 40 E h c w o n i c Components

1 Sheel No. Ia/c/ 1 Working-grow: R e v i s i w Publicmion No. 68

'

IEC 40 (WG) 1: Appendix IV

International Elrctrotechnical Commission Technical Commin.e No. 40 E l e c t r a l c Compmenr.

I N- I a / ~ / 2 Wo*lng-pro\p: R e v l s h P u b l i c u b n No. 68

I TEST REPORT

9 Greater than 1OOO

IEC 40 (PIG) I: Apwndix IV

1nlcmation.l Elcctmlechnical Commission Technical Committee No. 40 Electronic Components

1 9h.-* NO- I b/C/ I , Workin~-(Clow: Revision Publication No. 68

Greater t han 1000

I TXBr REPORT 1

* Greater t h a n 1000

IEC 40 (BIO) 1: App.adlx IV

IntomaUonnl Elocuotechnlcd Commla~lon Tochnlcd C o d t i o o No. 40 EloCUmlc Canpollemu

I s e t NO. I I 1 b/C/ I wot*lng-gruw: ~ e v h i a n PubUcrtlon No. 68

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