Document o9qjG80OLyD23zVvjzGopzaZD
Data: 1/10/57 3v: CM:OWM
____
Material: A rod ora, Pyranola, Inerteens, and Tri- TetraChlorobenzene 31ends
Teat: Dielectric Constant and Fcv.'er Factor
*j T -r) r c ; Page: 3 (of i'Jpe^es ,
C . On Panel No , 3 (Cnpacifcana BrJLdg3)
a) Turn "RANGE SELECTOR" switch to "lQCo" for 60 cycle ~-
nieaspresents
to "1 Ko ' for 1000 cycle measurements
b . Turn "METHOD SWITCH"'to dir act:,
'
c. Tarn "DISSIPATION FACTOR" selector switch to :,Q".
D. On Panel Mo, 4 (Oacill :.tor)
--------------- ----
-/
a. Disregard this .pan si for ."ensure manta at ~o0 cycles^ .
"o. On 1000 cycle meas orament3, depress the Ho, .10 "iMU-Tri'?!':'
3Y" button 0
*
c. Set "FREQUENCY DIAL" to 100,
d. Turn "OUTPUT" dLcl so that pointer is at the end 0.' I;:--; ' arrow.
3.. Depress the "I/T-IBAL. 5000 OHMS'" button.
Date: 1/10/57 By: CM:OHM
Material: Ar colors-;, Pyranols,
Inerteens, and Trl- TatraChlorobenzene Blends
Test: Dielectric Constant and Power Factor
Method No.. 11 .c6 -3' W.S.S. Cav: :, No , D*-? Page: 4 (of14 pages
When all of the above adjustments are made, the electrical apparatus la ready for measurement of Dlalectric Constant and 2*3c24v5er* Factor,
-II, Determination of Constants for the Apparatus
1 Carefully assemble the cell which has been cleaned and dried within the last 8 hour 3., F-afer to Mathod 30. II.751 for she procedure to use in claaning the cells.
2. Place the cell assembly in the Fisher oven which has been ad Justed to 25*C.
3. Connect the back wire Inside, the oven to the lead on the outer cylinder of the cell and the-'front wire to the lead on the inner oylinder of the cell.
4, Connect the coxial cable from the capacitance bridge to the fitting on top of the oven.
5, Remove the thermometer from the top of the oven before going
on with the test. This Is important,
-
/j DSW 551065
-
STLCOPCB4089482
Date: l/iO/57 By: CM:CWM
Material: Arcclors, Pyranols, Inerteens, and Tri- TetraChlorobenzene Blends
Test: Dielectrio Constant and po'*'er Factor__
Method
i , -oJ u-Jo- ";
Pape: 5 (of 14 pages
Make all adjustments on the electrical apparatus as directed in Part I of this method,
Balance the bridge by rotating the "CAPACITANCE" and "DISS IPATION FACTOR" dials oh Panel No. 3 until the wide vertical band on the osolllisccpe Is adjusted to a minimum width.
,8 Record the sum of the readings on the "CAPACITANCE" dial and vernier and call this value
9o Remove the beaker containing the cell from the..even and fill with benzene (A C ,8. grade) to a level 0.737 inches (ca , jv4 above the top of the concentric cylinders of the cell.,
with a thermometer.
of v- li a bense ne to 25;*C.. while stirring
11o Replace the
cell
in the
oveenn
{ 15 .)( *\ -
\d v ^
C.
and
.;yj
> `y. a
electrical connection
as
in "S ^ O Ci# C
d
3 and 4
no NOT interchange
connections,
12, Balance the bridge again as in Step 7
1/10/57 By: CMsGWM
t: Arcelors, Pyranols, Inerteens, and Tri-.Tetra-
Chlorobenzene Blends Test: Dielectric Constant and
_______ Power Factor___________
Method NOo 11,603-57 N.OoK o Dent o >'o , 246
Page: 6 (ox' 14pages)
13- Record the sum. of the readings on the "CAPACITANCE" dial and vernier and call this value
14, Calculate the cell constant by the following equation:
Ce.ll Constant, X = B A 2.37
___ , {this is usually around 3 70 uuf},
15" Remove the cell from the oven a no balance the bridge as in Step 7 with the "CAPACITANCE" and "DISSIPATION FACTOR" dials .
16 , Record the sum-of the readings on the "CAPACITANCE" dial and
vernier and call this value . (capacitance of connecting
cable),
17. Calculate the CELL LEAD CAPACITANCE by the following equation:
CELL LEAD CAPACITANCE, Q. A - P - K (this is usually around
3 uuf,)
_
551066 OSNN
STLCOPCB4089483
Date: l/l0/57 Material: Aroclors, Pyranols ,
By: CM:GWM
Inerteens, and Trl- Tetra-
------------------------------------------ Chlorobenzene Blends--r--
Teat: Dielectric Constant and
Power Factor
Method Nc,, 11,608-57 Pag: 7 (of14 pages)
WHERE:
A = CAPACITANCE C? ENTIRE SYSTEM IN AIR (SYSTEM CONSTANT)
0 -'CAPACITANCE OF THE CELL LEADS (CELL LEAD CONSTANT)
F = CAPACITANCE OF CABLE AND WIRES WHICH CONNECT THE CELL AND CELL LEADS TO THE BRIDGES. (CONNECTOR CONSTANT]
K = CAPACITANCE CF THE CELL ALONE (THE CELL CONSTANT)
Tabulate the System Constant (A), the Cell Lead Constant !G)v the Connector Constant (F), and the Cell Constant (K) on a piece cT stiff paper and post them near the instrument where they'can fce easily referred to for comparison and calculations.
These constants must be checked at least once every three months
and in all cases where the Dielectric Constant and/or Power Factor-
are out of specification.
'
Date: 1/10/57
Material: Aroclors', Pyranols,
By: CM;GWM
Inerteens, and Tri- Tetra-
Chlorobenzene Blends
Test: Dielectric Constant and
------------------------------------- ---- ---------- Power Factor______________
Method No. 11,608-57 W.a.K. Dept,, No, 146 Page: 8 (ofl4 pages)
________________________
III- Measurement of Dielectric Constant and Power Factor on Aroclors, Pyranols. Inerteens. and Trl-Tetrachlorobenzene Blends.
A > Test Run on Cell to Determine Whether it Is Clean and Properly Aligned.
1. Carefully assemble a cell which has been cleaned and dried
within the past 8 hours.
,
NOTE: Refer to Method No.-11,751 for procedure to use in aleaning cells.
2. Adjust the oven control to hold at a temperature of 1C0C . for all materials except Tri- Tetra Blends. If a TriTetra blend is to be tested, adjust the oven to hold a
temperature of 25'C
5. .
Place the empty cell assembly in the oven and. conneot the
hack wire inside the oven to the lead on the outer cylinder
of the cell, and connect the other (front) wire to the lead
on the inner cylinder.
... ___ ___
DSW 551067
STLCOPCB4089484
Date: 173-6/57 By: CM:GWM
Material: Aroclors, Pyranols, Inerteens, and Tri- TetraChlorobenzene Blends
Test: Dielectric Constant and Power Factor
Method No. 11,608-57 tfoG.Ko Dept,, Ho, 246 Page: 9 (ofl4 pages)
4, Connect the coxial cable from the capacitance bridge to the fitting on top of ohs oven.
5, Allow 15 minutes for,the call to reach temperature equili
brium inside the even,
6 4 Remove the thermometer fr*pTM *>*<e top of the oven before taking any measurements on the bridge-, ~This Is important
7 Make all the adjustments on the electrical apparatus as
directed in Part I of this method,
--'
8, Balance the bridge by rotating the "CAPACITANCEand "DinSIPATION FACTOR" dials on Panel No. 5 until the wide vertical band on the oscilloscope screen is adjusted to a minimum width,
9. Record the sum of the readings on the "CAPACITANCE" di..I and vernier and compare this value with the SYSTEM CONSTANT determined in Part II of phis method.
IMPORTANT: If-the value obtaInedIn Step 9 does nor agree with the System Constant A (Part II} within 5 uuf, the cell
Date: l/lo/57
Material: Aroclors >' Pyranols,
By: CM:GWM
Inerteens, and Tri- Tetra-
Chlorobenzene Blends
Test: Dielectric Constant and
;_______________________Power Factor.
Method No, 11.608--S7 W.G.K. Dent. No. 246 Page: 10 (of 14pages)
must be re-cleaned, re-dried, re-assembled, and the test run for the System Constant must be repeated.
NOTE: Although the above teat run must be made prior to each analysis , the, value obtained in Step 9 is not to be used in calculations but is to be used only as a check on the clean liness and alignment of the cell,
B . Procedure for Testing Materials
10. Remove the; cell from the oven and fill the beaker with the material'to be tested to a level 0.737 Inches (ca. 3A Inch) above the cylinders of the cell.,;
11, Adjust the temperature of the sample,vtoc;100"C. (uaie hot plate) for all materials except Tri- Tetra blends.;- Jfbr. lyi-`Tetra blends, adjust the temperature pf the samDle. tdtr?^f^ using
an ice-water bath if necessary.
notet stir sample continuously with a thermometer while
adjusting the temperature.
. --------------- ----------------
DSW 551068
STLCOPCB4089485
Date: 1/10/57 B.y; CM:GWM
_______________
Material: Arcclors, Pyranola, Inerteens, and Tri- TetraChlorobenzene Blends
Test:" Dielectric Constant and _ Fewer Factor
Page: 11 (ofiii pages iv
12, Place the cell and sample in the oven and make thd same ccnnections from the cell to the bridge as in Steps 3 and 4. W NOT interchange connections.
13. Aliev? iifteen mini tea for the cell to reach temperature equilibrlum inside the even
14 Remove thermometer from the even before taking a measurement i) This is Import? nt f
15 Make the -adjustment of controls on the electrical apparatus as directed in Part I of this method.
lb. Balance the bridge by rotating the -"CAPACITANCE" and "DI3 SIPATION FACTOR" dials on Panel No, 3 until the wide ver tical band on the oscilloscope screen is adjusted to a minimum width.
17. Record the sum of the readings on the "CAPACITANCE" dial and vernier, and call this value
18, Record the sum of the readings on the "DISSIPATION FACTOR" dial and switch. Call this value ,
Date: 1/10/57 By: CM:GWM
'
Material: Arcclors', Pyranols,
?4ethod No, I1.6q3-57
Inerteens, and Tri- Tetra-
W ,,G,K. Pent, No, 246
Chlorobenzene Blends
Page: 12 (of 14pages)
Test: Dielectric Constant and
___ Power Factor___________________________________________
Calculations:
Dielectric Constant = X - F - G K'
.
Where: X "Capacitance reading from Step 17, F ** Connector Constant (Determined in Part II) G Cell Lead Constant (Determined in Part II)
K =Cell Constant (Determined in Part II)
% Power Factor Where:
m ay *0
f " Test Frequency (60 cycles or 1000 cycles)
f0 frequency of "Range Selector" on Panel No. 3
D Dissipation Factor reading from Step 18.
NOTE: When D (dissipation factor) is less than 0.1, the dissipation and power factors differ by less than 0.0005. Therefore, for our measurements, power factors and dissipation factors are equal,
DSW 551069
STLCOPCB4089486
Date: l/lo/57
2: CM:GWM
Material: Aroclors, Pyranols, InerteenS) and Tri- TetraChlorobenzene Blends
T_est,: Dielectric Constant and
.Method
ll,5cd-f-57
24 j
Page: Ip (of 14 pages
;Poi-gr Factor _______________________________________
.Precision: (Reference: General Radio Manual for Model 716-C Capacitance Bridge)
a , Capacitance readings are jirooise to 2 uuf :: multiplier reading
( 0o2$ of full scale for each range) when the dissipation factor is less than 0=01,
b. Dissipation Factor (Power Factor) readings are precise be + 0 ,C0G5 or
2$ of the dial reading whichever is larger, for values less chan.
0,1 for D (Dissipation Factor).,
.
IV. Apparatus. A , Oscilloscope: Heathkit Model 0-6.
3., Constant Temperature nesting Unit: Fisher Isotemp oven, . 15-245A, modified to nncluce inter-wall connectors.,
C A, C. Generator: General Radio type 1302-A,
D. Amplifier and Null Detector: General Radio type 1231-3 'i-h type 12ol-A power supply.
Date: 1/10/57 By: CM;GWM
Material: Aroclors, Pyranols, Inerteens, and Tri- TetraChlorobenzene Blends
Test: Dielectric Constant and .Power Factor;
Method No, Il,6c8-57 W,G,K. Deot, No., 246 Pase: 14 (of 14 pages
Eo Capacitance Bridge: General Radio Co, Capacitance Bridge type . 716-'
F. Test Cells: G. E, type, concentric cylinder electrodes CatalOK No, 1.559.663.
G. Class B driver* transformer: This is used for 60 cycle measure ments to excite the bridge directly from the domestic power line.
It has 0 volts output with a 4300 ohm resistor in series.
H. Tuned Circuit Filters: General Radio Type 1231-P2 (400 and 1000 eyele) and 1231-P3 (60 eyele). These filters aid in obtaining
a more accurate frequency for the measurements by removing,
harmonios # noise., hum, etc.
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art**Imrtrh.fcmbetfawtodw *"*'*** licoMMCiiM with th toe afttibov.
j, DSW 551070
STLCOPCB4089487