Schematic
Appendix 2: Drawings — Digital Voltmeter, Model 26.268
Read the PDF (33 pp) ↗
This document is Appendix 2 of the EAI Digital Voltmeter Model 26.268 manual, containing the complete set of engineering schematics and wiring diagrams for that instrument. It covers the top-level 26.268 DVM schematic (4 sheets) and wiring (5 sheets), plus individual drawings for all major subassemblies: the 6.463-6 Dual DC Amplifier, 6.736-1 Reference Amplifier, 12.937-5 Miscellaneous Network, 12.1106 Rectifier Network, 12.1654 Conversion Delay Network, 26.116-1 Summing Resistor Network, 26.240 Comparator Amplifier, 26.242 Comparator and Diode Gate Network, 38.032/38.032-1 BCD Counter and Decimal Decoding Matrix, 43.141 Power Supply Regulator, and 44.302-1 Programmer. All drawings are prepared by Electronic Associates, Inc. of Long Branch, New Jersey, in accordance with government electromechanical drafting standards.
- Manufacturer
- EAI
- System
- EAI 580
- Type
- Schematic
- Language
- English
- Learning track
- machine reference
- Pages
- 33
- EAI 580
- EAI
- digital voltmeter
- schematics
- wiring diagrams
- BCD counter
← Back to the Reference Library
Appendix 2: Drawings — Digital Voltmeter, Model 26.268
SH —= — — —_
APPENDIX 2
DRAWINGS
DIGITAL VOLTMETER, MODEL 26, 268
This appendix contains necessary schematics and wiring diagrams of equipment described in
this manual. To facilitate locating a particular sheet, an index is provided that lists the model
number of each unit or component, the type of drawings, and the associated drawing number.
The drawings are bound into the manual in the order listed under the index Drawing Nvmber
column.
EAI drawings are prepared in accordance with standard drafting practices for electro-mechani-
cal and electronic equipment. All symbols are in accordance with current government stand-
:
]
2
1
:
:
:
7
a
p
a
a
D
i
ards.
INDEX
Unit or Component Type of Drawing Drawing Number
26. 268 Digital Voltmeter Schematic D026 268 0S
(Sheets 1 through 4)
Wiring D026 268 OW
(Sheets 1 through 5)
6. 463-6 Dual DC Amplifier Schematic D006 463 0S
6. 736-1 Reference Amplifer Schematic D006 736 0S
12, 937-5 Miscellaneous Network Schematic C012 937 Os
12.1106 Rectifier Network Schematic BO012 1106 0S
12.1654 Conversion Delay Network Schematic BOO 012 1654 0S
26, 116-1 s Resi Schematic C026 116 0s
26. 240 Ce Schematic B026 240 0S
C026 242 0s
B026 242 OW
D043 141 0s
AOL ED orn MH FBC piggy
RIP pa2,
R4 ali
sb caw Sas pe i de et et or aot
See ae TEE
[ ee 26.240 |
ee |
!
|
1
|
|
[ “ako SEF
an Ae poy ee er Se
i 2 i af
.
9 Sod tty yorum
fuer
al
i
00
“ee
=
!
I
|
|
} /
J2 = > ; ;
ure dt
as : OS O's OUTPUT DIGITAL DATA OUTPUT BINARY CODED 0 DIGITAL DATA ovreuT
“ ~ 1005 10; 10'S VS Vs
—/
¥ Ty GENS FY ; oe
2
card
i
p+,
= Pe
Cie
Be >.
nr C24
at 32
=, +2~
>2
a, ny
[>
Msp,
=
Ry KwoK ITY =<
RK ‘ 5 ‘F: SOS CT See Sy ; FPyI yyy 28
141/41 5] 4 a9] saoumaoue Ht “al efaj lel 2 ciGAlGhp
> HER
AS TI 22
7 ~ =F o's an 1
yu AB 11-24 7
paanaerss 1b tpn |
aoe = cage ;
Ley ce a ies mr oe 2h is
i > > r—<19— —<i9e— Ee ince gy
|
Ke »
' ;
eh s
Be c |
| | nel pee
i},
eS |} ——<226— ENABLE IN 3.4) a5 31H
nae
2 mt |
ep courER 3B.032-0 "4
MAES:
+ CUS? ofygenng
4 Ye Rest TAeS [a ar £10 HEN, Pe ConemaneTe
A sea ne
THebay
0M,
RECTIFIER WETWORA, if c— EG ' e
2.//0@ | y) se ; -
\ 75 bs
‘ <—— 93 —> J pee
1
1 : owen see |
I tee ULAIOR Vie
i 1 OU al i '
fi G4 7 t2OY ye
| g—<—<—_j 96 | ; F *
! te ee] |
4 i
| ! | laipeaiia Il tee entan Nl be Poe a ee a
am laslbsal Nid taney | det gate
emo TL
| f REG vy [A450 | 38,0824, OIE, 30,088 0ly 4 MOET | AN,
1 é 97 £ ' oh, 7, eo ee a Ost PPL weve
4 > 98 ar Was tdababal ee bela L ys ' y
sS. 7 '
| iS || | @ i ey | rep gap Zp Pe 2
| ca) SL Ro bv ! | x ae i ae)
le m2 Z, Z = _
a ia?) <f S REG: FY Be = £ er Ut-4
1 Hie 7ow OF | G/0 | I23-2 p= Br eRe. , es
1 5 SS au —— | e ! Je hee
1 pee ole | FAN AS ANAS ~~ 9 pay . Sau
Le ibe G4 i Nws { ai
XC | i CONVERSION DLLAY >9 er4
| be | | iL wetworn “fear
| - ! eee 3-10
/ ' pel vv 462 apie q
i MH 8222 gunmen |
1 yy +2V 7 GABF EIMNIN GUEST
° | F 2
idee 1,
=£OV 53.5
fe
it
A.A --
—i tele 3
a5
4 S| een cis l
THI |, AMOLIF AER. 4 -- ;
<< - f ROE GATE i ~ £2-14
—A4g 26-242 S28
5,
EE a
MIBC
pu pe beers ; on
is JOS O'S 1000S PROGRAMER Ps NET shapes E2ff2 +2 AIM Ak? Ae RES
REG GkO Ake = une
RECT, Vig) 4) rok | fr)
wom we Al 42 a3 At AS ve/ And x rr ee picwrT 6
ie HOG © '3¢-Seur | |
nee a) DERE | Hae apie esp |
a LWACLE Wh ig /4 GOT EAP BI nc BAS Tas geo | Tf CAE
azh ae ye 5 AERO asl 2ova nis) by 2IF us GRO oD
Pe aamlicondd 69 neh Be “a > POE be; 5 pe GRE 4 poco TT
2 PEE LED hoa ace 2a) 5 Bus Geo 9) 20 wae
3 [exe wich y 2 Porvinpellavacetd) 6 i eas | | ecxPe | glee}
plot Se} y é Prior BD Biel 24 waa (240) ELS -) =a 8 par J) 2
Ezra nner 7 z Bec *le | —____ou 74800 Vig
Ce me aa 7 GOL RED RD N24 vac Coto) g £23 pice 2 Nee 2
10QLEE EE OOM 24 une (ee) 4 £2-4 CS ee
— — —— [| st J OC Ht 4 Yr BED CU/) Og wae (4 2) cf eed
MG ——— AN te (08 5 15
aw) = sas | £F ce |p : We seo] puc | __baz-0 age ve]
HOLD Bie £ |wureen % +, ae y- e| oenw Js Ce
Ax = “ | A LDR +40 402 Leap _|eesisTo 3 Can
| ¢ bs Lal W 7% CT ES alent Pepe. | Ferre feo) | — — $= 9 Pa! ed
Po) Ft NL GEN yy | 8 Syn teva | +75 | rages 5 gShamee| 895 ge imgteen fn
| aug — o | ser vee, 2 pnt ew ces!| eveeyig| 422° pr $-/ G Yaw eor| sus fe wpeeeo
GATEO | cLocw Pius 7
7 eo BIS 482
| a Ey BEN v | gee __4ty NET 2
9d L r =(50V. a — +—— * es
ce as esas} ste) Pa oh os Ae nore est| ven} o*
£2p e498 SABONG 1} bec 2q MGCT ESO VRE) 7 yer oT = seins | SUMIETION, cax |i
= =| Pee ou wlewwie _|evac | __4 2e4 = Fs (
c mr VIC eit
ee 9 07 VEVAC _ SHIELD Bie
went yo = [Bu 18 }-—_@ c£4 44-2! BLK 20
cs yee 62-412 ¢ er tH
Ez-1d pHQ-SED| nur Bixze as
Geo | Bix 25
2-39 —__- psec nn eae tie
5 74 x18 a] 4!
BAS RO Bix 16 eke za 3 Tee ker la Bx |
Zz AED = 242 =
— ul Bow
seo ees oe & snov | wr
ys tale Bie He Q tHE Reb - |Bi Fiuree | ¢-15) Rs-1_ 2. F248 OK 75 He 4) -\D0V REF] war-vio *
HAR 2) Sk SED 4, A 4 4 <> |e < 18] geeeo 3 Gah ourper lame ma l22 w. 4 Seal linia ;
D BLEZO } 5) phoma lamer ‘pi zZ be Lo ave. & lonpur | yer |,
4 g| te - Gee. pxto |,
+8 ry, J =@vaRS ime po 4 cs. Back /6 Pepper Pea Bek STAe mur | gwewweo| wer =
6, arr heD ~ {RED a eens § e2-/7
3
= BLK STAB \curruT el swmned| wer
sv T- Vio 260 -Bv z. - Kt
bof a BON sone -vo-reptie JOLT weer) po m LXE 2 ba
z. ZELO SET. coax Fant ARIST U A Ss. 45 -zv wer = |yonkep | ac
“ FF Ps Bene =
8 la 46 +40V)
4 é +27 wat lei ew
8: GBVae ul rd
S x
eavae liz 4 wT - BL | A =
2 BEN) “£ PA
5 oy] see 220 vbe a 8
7 + | Shee DED 220 VAE Buca 2
apy 16¢-e_ + ¥
aK "‘R” sum, Sank
LETT ian
3 rr = SHIELDED =
+S ‘
Zod
4) te 42-23
v San) | ean feck | yen 2 cs
| ———#2-22
2 2e £0 20 spn, MP our |X) «<2 BLK “ZO Ng GRO | 4 E/0
Riree | C25) =f eT
4
aie | eu $+ 22+/ 2 7
67 a 2+)
H ——=| sone
es _—— eo es ee Y ——— 1 ———F1
23 - x i) —_ =PF2-G =
iS A ie Te 7 -———_——_;—__| 2) Sn ——S= | == _ +— 7,
Z7 — cowees | cone, an 7
{ p———icovee s | ya ga 4
| [> -———-——_+_|2#e Ser >} i is
2 im) Signy FE. 20 ———_—————— | ee ==
| 3 yee |,
1 ier eae Sleek seow — 5
5 Lourrur [ree &-
4 Le sy y 3-2
iz
HARNESS 73 [27 2 2 2 2 2 x |
£ é / / ———1 |
shen nad f £ | | jp */s0 | | wwreeeo| __-4//
| per een tee Sas = ee }———] yio- JoRM is
aH tov bee | a ee -—————} |ywuere wi
3-6 : | pee a St
¢ Po —}__] |
ZR cow \cowmrs, | ere) : —— iS Bie%g{ _ +2
FP: £622 aixee be PS AA zs [4 ~
iE easel ___| |
Soeeliees iiteeeel Ieee i eee Ln i a ee 9
i TT —-:—CO CH 29-3 aed eget sie ASSOCIATES. INC.
{ (aa) a | ele wee ES ae ELECTRON scx habe ESTE
7
were ae
. ee wires Aer ease
PE nla ss wae Gee $y/ es
ay 77) ee NWR RI 48 Ge
1 ee) re
rg@0 aes ory oe
& 1D LKEO,
Fo) 16 ie
yao. b-a!
jer 4 ee tia
sam ee | BRD. DEK 4) Lig
ss }-——+ 442 Bete
Bue 6-03 ‘ i _
2-3 |}__—# £#-2
a Be ee T : ad
22 8-24 : 4
LEW esé
5) oo eoax = 36
TL _lanep mx) os
8 -OS
ye o- OS a oe
f-90 | :
ere rro. BPS
oh eee 46-2
£ jt ee
e Bb =o a
7 { = ra wise 7
ee0
— marae anes a
see Bax 2, SSS en |
- é
m
geu Ps
— 20 |
a : : | : i / |
li | So ; *
, r 7 ia a ~ t
| zip l r |
—_| ¥ | Liji a ee
= = i= = —$e2
ee —_ }
Lo | == | i | ’ | fp = ‘io
$$} 4 29
ae eee 1 ] Un |
: Z i a |
I i ] ee) nT e7 {| |
_ | ee ih a } \
7 - Vin he \
SI aes len | |
be) ed
] MOTE
; Soa SS 2 Ap MEMERLESS MOE
Te Al 42 as fe: —
7 Ew 192008 Bie
av 7 AC) Ae — ’
— | 2x $INE GPU P
2%, =D. VEL .
2T U ae ‘
> aX 2 — :
2 3 — é
as 4 — vic 2
/ooo'. rips = Biv. nt
$< 2p 6 Bee "
25 P] oe
a EN
— aT £
20 re) 2
v7)
7 fe : BLE
a = WAT a
24 a :
— | 2h 4 a r
ae Biv WW
joo’
2) GS SV Z
| o 3 See s
| 2a q RN
- ZED S
2H } .
H
(* : BLé
ee : oe 8
ie 3 ay ;
ie s vio 4
ws a 6 Ea y
; AT z GN gn
| ZL
] 1) é ez £
hy 9 a .
Oo ED
tit ‘
1 é TA 1 -
| +6 2
+e 3 St FE
_ #D # vio fe
13 Los £ Bi _
ae a = Gen re
‘]
ye
] 4 a : ORM =
= i ——!
be 2 he
H
]
es 5
ELECTRONIC ASSOG
[tone nmin new senate 8
SHT. NO.
REY, NO,
acT
19/69 |C C2@ 208 ow
VEE Sie oes! 6
HARMESS WS
= ar Es
Ae Ee
|
As a4
||
-
Fr ag Se
I | ! 7
2) @ a
2
0
yi
a Ce ] ad
CESa SoStH
: ,
at eezs
fr B £eé
SOE VIEW ¢ S0-BUS e7
BRN
WHT- BRN
ae
af
BoOVv10OM
LES
rs res pen
500 wvpe R4
$
Rois UNLESS OTHERWISE SPECiFiey
{oj ALL RESISTORS ARE ti0y sow
VARIATION MOTE: ies
FOR 29 6 38 5
1) FOR, 25,8 38 APPAR MIME THE FOLLO@WRD RESISTOR & CAPACITOR
RHl,15-1439 FROM 100K TO 56K
Ri4.S® FROM 500K To i80K
see Hoa Se seo wine 10 Bos7uF, v0 wvOC
Fo, TSWVOC MMurD, 1OCOMVDE
Re FRU S.2K 19 4 6x Rae!
23 FROM 686 0840 f2N6s2) To 696 105 0
B- B- 5
Re
RT 33K
100 £5 % 4
boa
614 cO7 0
1000 wyoc c23
(4
ce
joo 7]
cal
——— 0
6i4.0430 | 2
5
Ee +> 2 ouTPuT A
B+ -05ut '
Q3 500 wvoc ;
686 207
iia o5 ps2 '
1
5 |
25% i
B+ 1
a ¥ 2GRD
1 yw
; (
CR
: +4 B I ye sen
e9go =| 640430 1
aly UW CrASSIS GEO
ran
I
i)
1
1
'
'
y
’
i)
1
1
'
1 L - (dss 1
H cea i 2 I
+— —t— > ia 8 OUTPUT B
‘soa woe
8
ae
>
eee
re
ow
Fan = Sue
few T
fe on jt |e
tw NE £e7 27
£26
I 22k Sk bw
es, eel ~ S/o
205% lic
7
ger
Voc. Ve
3 cw
23 £27
Se fan
[re
ey -¢
i
} eegy
- 2 47 ‘Sice Taate oF uiliT #es)
AG Rae !
Sue | |
sdpes: \
——— Sw we He eeeB@eF FS = = wa ss
z
I
Bg
Ral
| 222
NEn Ga 6)
é
SS
Y
Na
kad
MOTES:) jess OTHERWISE SPECIFIED.
“20 oo A, RESISTORS ARE 10%, Y/2 W.
| 720V 8B ¢———_» 6. HOLES ARE TYAE 6/4 O43 0.
| ~#00V C<————> WWMPER USED ON
CHASS/S GRA X & “5 VARIATION ONLY. \
26% 2e ao ria--5 2
a ' aan | 3
Me O77 ‘ $+ drt —> 3 425% LOAD RESISTANCE
a] - a R8p cow pad cw
—. 2 COMP AMPL. 5.P.
Sieane 2 2 _, 22 = 2) K OHMS “O"SET
A com Be ew soon
UNLOA K ca ee oA : > 205%
ee ery ee ~ SP k OHMS LOAD
SD amet 3B BALANCE
S & AMPA" BAAMCE
srame..A” Ué
wy XK OHMS. RELAY
7“ (K OHMS O SET)
z=
\ aN
“f
<
Beane or ime xs |
a 7 | cre
OF CAL/BRATION. 2
SF KE RELAY OR/IVE
e 44 KE RELAY CONTROL
RYE
_|foze
oy OOO ae a
f > RED
Ce CR7 ma Fea
“© © oF © BS
R2
{cez]
2 9
OVIF b 1 eet set ong
NOTES:
i. ONLESS OTHERLISE SPECIFIED:
A Au RESISTORS ARE 75% YOu
B. Al TRANSISTORS ARE 2ZN \305
CAL DioDES ARE UIA oo43 ©.
-|5v —15v
RS RIT
DELAY
—6)5 TRIGGER OVTPLI
RO
R9pRiip_—RIBp_—RISp RIOp
RI3 || RIS RIO ||. RI2_
R5
R7
R2
bl 12.5 MEG 5
1,249, 685 WwW——{2)
80 (0)—"~wy, eee
£.1% IW
R4
2.5 Mes 25 MEG 4
40 © A
tO5%IW
RE
RS
5 MEG 50 MEG "
ro 11% 2W
t1% IW
RB
10 MEG 100 MEG
1o (A Ay
t1% IW r +2% 2W
s R9p 5O RIOp 500 RIO
sooo Gy? g a Bheoge Maw 5% aw 42 2 124, 588 ach
+.05% L.5W c F
RIlp 100 Rio
24.896 2 25% aw 249,749 “06
400 whe a 2} E ©
eS marae am cw 4 4.05% IW
RI3 RI3p 200 nea
$.05% IW witéi‘ wv +.05% IW
RIS RI5p 500 RIG.
[ 2} fo 4 999,598
$.05% IW cw | 4.05% IW
Sehb {«) -100v
© Lis re otk (H) INPUT
1,253 oY
+ 05%
SEE TABLE
RI9Q (SEE TABLE)
12 MEG
-1oisit C
[4s _SKowA wee Z7MEG ES Hwa ogo 22 Se [Fe Bad
/ . "A026 264 OP FRM rae
: , “|aa26 246 0P |=? %c a5
L877
NOE;
&
SUMMING °
VUNCTION
uA
7
N\
-20V
! Le
SOK
A CONEEIS §OTHERPUISE SIECIFVED,
RESISTOCS REL F7D% ZA.
TRANSISTORS §3- 96 ARE 2N/309 TYPE,
TRAWSISTORS O/ £ 02 ARE ENIIQL THPE.
<—: ODES ARE 6/4 242 0.
COMP.+ COMP. -
-2@0v -20v #9
!
es £6
SOR * 4
J
|
COMPARATOR @ e OTe =
AMPLIFIER + 49) | TE
+90 48) 0 S= +
7 era
: @ Oa 4
~ZOv -@5) @- = R23 y Eze} —¢
@ & {cr2-¥ 5 tee —4
7) : CR/9' £o {
—43) ®) (0)- a CR“8 >
O- 8 5 Oey &
D) 8 /4}—®
@4- rs
® 9 Oh 4
GND ) © 75 ,
ZERO SET : i
G- > @ SSS =
!
ZELO SET @H4 Lb CRS 4
suenrnies Ho) aoe
o ° oF
SS,
Nn a as ee ee
NOTE:
|. USE INSULATED TWO WAY CONNECTOR ITEM”
TWIST WIRES TOGETHER & CRIMP WITH T&B
TOOL WT— 105M.
2.WIRES FROM POSITIONS 1,2,3,4 ON HRI &
HR2 ARE EXISTING WIRES ON HEATER.
3. Pin42 & PI-43 ARE SOLDERED TO 26.240
P.C. CARO FOR SUPPORT.
4.PI-34 & PI-35 ARE COMMON BECAUSE
OF THE P.C. CARD BEING JUMPERED.
TOP VIEW OF #,
ITEM'S
ORE TICAN 7 (SEE NOTE 2)
i 2
i (THERMOSTAT)
©
HR S| bh HR2
(HEATER) 2 (HEATER)
3 El
L
.| 5° ic
= [wi-arn*20 PHU
#
— BRN 20PHU
Pee OF OUTER CAN
LONG BRANCH, NEW J
| ELECTRONIC ASSOCIATES, Inc. ]
ERSEY
GATE
COMPAR 4 WIRIN & O/ODE
SHT. NO,
REV. NO.
PROJECT
1723 |8026 242 Ow
[ff sesasaecenascae
BIEEESISINTSISISISISISISISIE(S)S]eVSEICISTE]S
ange ee pee arb
| HIPISIE 22 cos0208
=
BINARY CODED OUTPUTS
K
*
cR4a2 cR46
4
S
£
t
£
$ Es ES
DIGITAL pee s
=
OR
f_ons3
SEE TROL OF yurr Nor
a = — ¥ cRa4 Kase site
J x 8 5 xones Fn3e Bs we
a
t
3
¥
te
se
TABLE
r)
-8V GRO
a
Hd| aged Meee Waae |
Hage Seg eage wee
247
RIS
R23
| pio VO pore DOO Ee
i i ip | iT 1
ely Vly Rig Paty
TI E H§ 78 L ae !
ak Se Fa ir HL :
fe |e § 8 22 |
| ee —y : : + 4
) Ogee ©
EO © & “
ese a see
F NAPs
onli 8S tk
rc
44, 302 Programmer
SICH.
e
a”
— xe
GOESIY canveesray
4h
FE Commeare
Wreeae
“<OnyepiON gf z2e2O
SOMO Belay vers
9
[
MOTES
Sa WHESS STHEPIISE saeciD
a | AlL RESISTORS 70 BE Vans 0%
ae 2 4LL DIODES FO BE asd of2c
Se TYPE.
| 3. 46k TeWNaSToe2s 7a ee 2iises
TY Re
A C477
ere
(2k ]
Log
[