Eico 950B - Schematic Diagrams and Parts; Simplified Schematic Diagrams; Replacement Parts List

it may be used without disturbance from external noises and is capable of
withstanding substantial overloading without damage. ng
Simplified schematic diagrams of the Model 950-B circuit at each position of
the range switch are given below.
Fig. 1. Bridge circuit for "l1Ommfd - 5000 mmfd" range (C2) and ".001 mfd-
.5mfd" range (C3).
Bridge circuit for ".Imfd - 50mfd" range. P2 is required to balance
the internal series resistance frequently present in electrolytic capac-
itors and is calibrated in % power factor.
Fig. 3. Bridge circuit for "SOmfd - 5000mfd" EXPanded range. R2 expands
capacitance measurement range as compared to circuit of Fig. 2.
Fig. 4. Bridge circuit for ".5Q - 500Q" range (R4), "50Q - 50,000Q"
range (R5), and "5000Q - 5MQ" range (R6).
Fig. 5. Bridge circuit for "SMQ - 500MQ" EXPanded range. R2 expands
resistance measurement range as compored to circuit of Fig. 4.
Fig. 6. Bridge circuit for "COMPARATOR" range.
Fig. 7. Leakage check circuit in "PAPER-MICA TEST" position. R9 slows
down charging process so that electron-ray tube action will not be
too fast for detection by the operator.
Fig. 8. Leakage check circuit in “ELECTROLYTIC TEST" position. Note
that R11,2.2 KQ, provides reduced electron-ray tube sensitivity as
compared to the circuit of Fig. 7.
ho
Fig.
Stock# Sym. Description Am't, —Stock# Sym. Description Am't.
23006 Cl cap. ,elec 8mfd-525V.. 1 11002 R4 res., 20Q, 1/2W, 1%. 1
21500 C2 cap.,200mmf, prec. .. 1 11011 R5 res., 2KQ, 1/2W, 1%. 1
20500 C3 cap., .02mf, prec. 1 11026 R6 res. 200KQ, Y2W,1%. 1
20501 C4 cap, , 2mf, preci. seul 10803 R7 res. , 3-dK62;, 1 eee
20000 C5,6,7 cap., .0lmf,400V... 3 10848 R8 res., 68KQ, 1W...... ]
20015 C8 cap., .25mf-600V... 1 10027 R9 res. '270KQ , V2Neae
23008 C9 cap. ,elec 4 mfd-250V.. 1 10037 R10 res., IOMQ, 1/2W...1
17000 PI por: elOKON.. <n oe 1 10818 R11 res., 2.2KQ, 1W..... 1
18007 P2 pot., IKQ w/SPST....1 10028 R12 res., 470K, 172 Were
19005 P3 pot., J0OOKQ, 4W.... 1 60030 S] switch, range ....... ]
10752 Ri res. , 000Q) -4W) 2)... 1 30005 PTI transformer, power ... 1
11027 R2 res., 250K, 1/2W, 1%. 1 90009 VI tube, 6X5 ...---s08 me 1
10030 R3 res., IMQ,1/2W,.... 1 90015 V2 tube, 1629. .. aan 1
NOTE: If your instrument fails to function properly and the cause of trouble
is not apparent, you may reutrn it to the ElCO repair department where it will
be repaired at a charge of $3.50 plus the cost of parts. If possible, ship by
Railway Express. Return shipment will be made express collect.