Plastic Film Capacitors — Manufacturing Overview

This is an English translation of the original German document (Schumann “Kunstfolien-Kondensatoren — Fertigungs-Übersicht”).

Round-Wound (Rundwickel)

Series	Voltage Range	C-value range per series	Tolerances
CKS Combination Styroflex-I / Alu-Folie	63 V, 160 V, 400 V, 630 V	Any C-value up to 8,800 pF (whichever is lower)	Standard: ±2.5%, ±5%, ±1%, ±0.5%
CKS-P Combination Styroflex-I / Alu-Folie, Zinn-Folie	63 V	0.001 pF to 100,000 pF	on request: ±0.2% or ±0.1%

Small quantities for prototypes/samples are also produced.

Construction of the CKS Capacitors

The capacitors are extremely damping- and inductance-free. By means of a Kal-Verschweißung (cold welding) or crimp connection of the external metallized connectors, absolutely reliable contact is guaranteed for HF micro-soldering pressures during processing. An excellent interference-free operation between the laminated layers and the current electrode is visible.

The housing of the capacitor is absolutely sealed for moisture. The enclosure is a PVC heat-shrink tube; shrunk onto polystyrene. The label is obligatory; the CKS marking is exclusive to the series only.

Order example:

Capacitance	Tolerance	Rated Voltage	Order Short Form
15,390	±0.5%	160 V	CKS 15.390/0.5/63
4,700	±1%	160 V	CKS 4.700/1/160
27,540	±0.2%	63 V	CKS 27.540/0.2/63

Print Execution — Cast (Print-Ausführung — vergossen)

Series	Voltage Range	C-value range	Tolerances
CKS-V Combination Styroflex-I / Alu-Folie	100 V, 160 V, 400 V, 630 V	33 pF to 470,000 pF	Standard: ±5%
CKS-B Combination Styroflex-I / Alu-Folie DIN 41392 Combination Zinn-Folie	63 V, 160 V	220 pF to 100,000 pF	Standard: ±0.5% on request: ±0.1% or ±0.2%
CKS-BN DIN 41392 Combination	63 V, 160 V	220 pF to 100,000 pF	on request: ±0.1% or ±0.2%

Small quantities for prototypes/samples are also produced.

The printed circuit versions come in three different mechanical designs that allow optimal space accommodation (Raumanpassung) depending on board layout:

Version A — upright placement on the component side
Version B — placement in between (between rows), extremely flat
Version C — flat on the component side, well-suited for SMD mounting on flat boards

Extremely damping and inductance-free. Impulse losses of the combined layers with an especially favorable self-capacitance for HF micro-soldering are given. An excellent interference-free operation between layers is ensured. No unstable film wound with these versions is employed; the two layers, self-adhering insulated, produce a controlled round-wound structure.

The housing of the capacitor is absolutely sealed for moisture. The enclosure is a PVC heat-shrink tube; cast in polystyrene. The label is obligatory; the CKS marking applies to this series only.

Order example:

Capacitance	Tolerance	Rated Voltage	Order Short Form
15,390	±0.5%	160 V	CKS-B 15.390/0.5/63
135,500	±0.2%	63 V	CKS-B 135.500/0.2/63

Why Build Capacitors — Schumann? (Kondensatoren baut Schumann — wozu?)

For the developer who wants precision capacitors in a rational large-scale production that cannot be purchased in any catalog from suppliers of normalized parts:

In C-values: any value within the scope of the series — in sequence
Narrow tolerances: Minimum tolerance of ±0.5% for any C-value — thus virtually any realizable value
In volume: from 10 pieces, 96 per series, for the relay (Schaltbild) is self-evident

General Data:

Parameter	Value
a) Temperature range	−10 … +70°C
b) Humidity load	85% rel. LF
c) Rated voltages	63 V – 400 V – 630 V (DC), 40 V – 220 V – 630 V (AC) / 320 V
d) DC insulation resistance	≥ 2.0 × Nennspannung (rated voltage)
e) Loss factor	Few × 10⁻⁴, according to Type
f) Temperature coefficient	−90 … −125 × 10⁻⁶ per Type
g) Isolation resistance	≥ 3 Tera-Ohm
h) Eigen-inductivity	Corresponds to geometrical length

Order / Delivery / Payment:

Dipl.-Ing. Kurt Schümann 8034 Germering, Blumenstrasse

Telephone: 08152/8080 (Private): 08152/6432

Represented by:

electronic (Handelsgesellschaft für Feinmechanik und Elektronik mbH) Münchner Strasse 50 8025 Unterhaching