Atec Solar-6220-1A User Manual download pdf

TYPE 6220-1A AUDIO ISOLATION TRANSFORMER

for conducted audio frequency susceptibility testing

APPLICATION

The Type 6220-1A Audio Isolation Transformer

was especially designed for screen room use

in making conducted audio frequency suscepti-

bility tests as required by MIL-STD-461/462 and

other EMI speciﬁcations.

The transformer may also be used as a pickup

device to measure low frequency EMI currents at

lower levels than conventional current probes.

In addition, its secondary may be used as an

isolating inductor in the power line during

transient susceptibility tests. (See Application

Note AN622001.)

DESCRIPTION

The transformer is capable of handing up to 200

watts of audio power into its primary over the fre-

quency range 30 Hz to 250 KHz. The turns ratio

provides a two-to-one step down to the special

secondary winding.The secondary will handle up

to fifty amperes of a.c. or d.c. without saturating

the transformer.

Another secondary winding is connected to a

pair of binding posts suitable for connecting to

a.c. voltmeter as directed by the applicable

EMI specifications. This winding serves to isolate

the voltmeter from power ground. Neither the

primary nor the secondary windings are

connected to the end bells of the core. The

transformer may be used as a 4-ohm primary and

1-ohm secondary or 2.4-ohm primary and

0.6-ohm secondary or 2-ohm primary and

0.5-ohm secondary.

FEATURES



Provides a convenient bench model unit

with three-way binding posts on primary

and output voltmeter leads. Standard 0.75"

spacing of binding posts allows use of

standard plugs. High current secondary uses

/4 -20 threaded studs.



Capable of handling the audio power required

by EMI speciﬁcations and up to 50 amperes of

a.c. or d.c. through the secondary in series with

the test sample.



May be used as a pickup device or an isolating

inductor in other tests.



Suitable for fastening to the bench top in

permanent test setups.

SPECIFICATIONS

Primary: Less than 5 ohms.

Secondary: One-fourth the primary impedance.

Frequency Response: 30 Hz to 250 KHz.

Audio Power: 200 watts.

Dielectric Test: 600 volts d.c. primary to

secondaries and each winding to end bells.

Secondary Saturation: 50 amperes a.c. or d.c.

maximum.

Turns Ratio: Two-to-one step down.

Secondary Inductance: Approximately 1.0 mH

(unloaded).

Weight: 18 pounds.

Size: 4.5" wide, 5.25 " high, 6.25" deep plus

terminals. (114 mm x 133 mm x 159 mm.)

ADDITIONAL MODELS

Type 6220-2 100 amperes high current

transformer.

Type 6220-4 50 amperes 4 KV transient

voltage HV transformer.

Type 9707-1 10 amperes low current

transformer.

1 2 3 4 5 6

Summary of Contents

Page 1 - SPECIFICATIONS

TYPE 6220-1A AUDIO ISOLATION TRANSFORMERfor conducted audio frequency susceptibility testingAPPLICATIONThe Type 6220-1A Audio Isolation Transformerwas

Page 2 - See Application Note 622001

TYPE 6220-1A AUDIO ISOLATION TRANSFORMERAUDIO SUSCEPTIBILITY TEST SETUP FOR D.C. LINESTEST SETUP FOR MEASURING LOW FREQUENCY, LOW AMPLITUDE EMI CURREN

Page 3 - APPLICATION NOTE AN622001

APPLICATION NOTE AN622001USING TYPE 6220-1A TRANSFORMER FOR THE MEASUREMENT OF LOW FREQUENCY EMI CURRENTSINTRODUCTION“There is more than one way to sk

Page 4 - AN622001 (continued)

AN622001 (continued) radiation. The current probe was somewhat better than the LISN for measurements below 150 KHz and above 25 MHz but, even so, the

Page 5

above 5 KHz when using an EMI meter capable ofmeasuring 1.0 microvolt into 50 ohms. For EMI meters such as the NM-7A and the EMC-10E,the meter sensiti

Page 6

impedance or the correction curve, whichever isdesired. Actually, there is no need to plot theanswer as transfer impedance, since the desiredend produ

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Atec Solar-6220-1A User Manual

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