Atec 6220-4 User Manual
Using Type 66220-1A Transformer for the Measurement of Low Frequency EMI Currents
Application Note AN622001
Using Type 6220-1A Transformer for the Measurement of Low Frequency EMI Currents
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.
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.
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"
Using Type 66220-1A Transformer for the Measurement of Low Frequency EMI Currents
● 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.
deep plus terminals. (114 mm x 133
mm x 159 mm.)
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