Atec 6220-1A User Manual
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 susceptibility 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 frequency 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
1
/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.
57
TYPE 6220-1A AUDIO ISOLATION TRANSFORMER
AUDIO SUSCEPTIBILITY TEST SETUP FOR D.C. LINES
TEST SETUP FOR MEASURING LOW FREQUENCY, LOW AMPLITUDE EMI CURRENT
See Application Note 622001
SOLAR
8850-1 or 6550-1
POWER
SWEEP
GENERATOR
SOLAR
8850-1 or 6550-1
POWER
SWEEP
GENERATOR
58
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