Equipment information

EICO Electronic Instrument Co. Inc. 955 Test Set
Manufacturer
EICO Electronic Instrument Co. Inc.
Model 955
Date 1962
Category: Measurement instruments
Group Test Set
Description IN-CIRCUIT CAPACITOR TESTER
Information
                                    The Model 955 is a truly advanced, highly dependable
in-circuit and out-of-circuit capacitor tester. In addition
to providing extraordinarily sensitive short and open tests,
the Model 955 includes a Wien Bridge for capacity
measurements, with a unique shunt resistance balancing
provision* that permits in-circuit measurement even when the
shunting resistance is comparatively low.
1-2. FACILITIES
Indicator: Electron-ray tube EM84/6FG6 Bright bar
pattern gives sharp, unmistakable indications.
Test Selector: Three-position switch — SHORT, CAP- ACITY, OPEN
Test Leads: One coax-type for all tests; detachable, with
input connector coupling to unit.
Short Test: Out-of-circuit or in-circuit short check with
shunt resistance as low as 1 ohm. Reliable up to 2000mf.
Closed bars indicate short. 60 cps test frequency. Max. test
voltage 6.3VAC (open leads), decreasing with decreasing
impedance.
Open Test: Out-of-circuit or in-circuit open test of
capacitors as small as 15mmf with instrument adjusted
normally. {With constant voltage supply, internal adjustment
can be made for 5mmf sensitivity). For in-circuit testing,
shunt resistance may be as low as 35 ohms for capacitors
above lOOmmf (3ΚΩ at lOmmf). Closed bars indicate open. Test
frequency approximately 22Mc, very low voltage.
Capacity Measurement: From 0. 1 to 50mf using Wien Bridge
with unique shunt resistance balancing* permitting ± 10%
accuracy at any point on the capacity dial in either
in-circuit or out-of-circuit measurement. The capacity scale
is screened on a 4" diameter, heavy- gauge lucite disc. The
reading point is just above the center of the indicator
bar-pattern. Operating frequency of the bridge is 60 cps.
The RC BALANCE control is calibrated in RC product
(equivalent shunt resistance in kilohms multiplied by the
capacitance in microfarads) in two ranges, 0.6 to 10.5 and 1
to infinity, selected by the RC RANGE switch. The very wide
RC product range provided, with excellent spread permitting
easy setting to any value, is the key to the accurate
capacity measurement provided either in or out of circuit.
For out-of-circuit measurements, the RC product value can be
translated into dissipation or power factor with the help of
the graph on page 16.
Line Voltage: 105 to 130VAC, 60 cps; 8 watts drain. A LINE
ADJ control on the panel permits adjustment to maximum
sensitivity regardless of the voltage variation within this
range.
Miscellaneous: Exceptionally attractive, professional
laboratory styling. Transformer-operated and protected by
fuse in extractor-post mount.
Tubes: 1-6C4, 1-EM84/6FG6.
Size (HWD): 8 1/2” x 5 3/4” x 6”
Weight: 4 lbs.

These manuals are available for the above equipment:

EICO Electronic Instrument Co. Inc. -- 955 -- Service and User Manual
File name Eico-7753-Manual-Page-1-Picture
Manual Type Service and User Manual
Pages 36
Size 2.93 Mbytes (3070680 Bytes)
Language english
Revision
Manual-ID/Number
Date 1962
Quality Scanned document, all readable.
Upload date
MD5 48e7652f2b4578066e575eb2c95bddd0
Downloads 61 since 19 February 2016
Information
SECTION I. GENERAL DESCRIPTION AND Page
FACILITIES
1-1. General
Description....................................................2
1-2.
Facilities........................................................................2
SECTION IL OPERATING INSTRUCTIONS
2-1. Controls and Terminals .. 2-2.
Operation...........................
a) Preliminary Operations ..
b) Circuit Preparation
c) Polarity..................................
d) Short Test.............................
e) Open Test.............................
f) Capacity Measurement ..,
SECTION TIT. CIRCUIT DESCRIPTION
3-1. Circuit
Description......................................................7
Short
Test......................................................................7
Open
Test......................................................................8
Capacity
Test...............................................................3
SECTION IV. MAINTENANCE
4-1.
General............................................................................9
4-2. Case
Removal...............................................................9
4-3. Open Test Sensitivity Adjustment....................... 9
4-4. Trouble-Shooting
Chart......................................9-10
SECTION V. PARTS
LIST........................................................11
SECTION VI. EICO SERVICE POLICY...............................13
FIGURES
SECTION I. GENERAL DESCRIPTION AND FACILITIES
Photo. Eico Model 955
........................................................1
SECTION II. OPERATING INSTRUCTIONS
Fig. 2-1. Front Panel Control and Terminals.............3
Fig. 2-2.
Example..................................................................5
Fig. 2-3.
Example...........................................................
. .7
Graph. Dissipation & Power Factor vs. RC .... 16
SECTION III. CIRCUIT DESCRIPTION
Fig. 3-1. Short Test
Circuit.............................................7
Fig. 3-2. Opt·?- Test
Circuit.............................................8
Fig. 3-3. Capacity Measurement Circuit....................8
SECTION IV. MAINTENANCE
Fig. 4-1. Tube Layout and Tuning Adjustment.........11
Fig. 4-2. Schematic Diagram w/Switching
Table for 955 .............................................15
Eico-7753-Manual-Page-1-Picture
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