Atec 8850-1 User Manual
MODEL 8850-1 HIGH POWER SWEEP GENERATOR
for conducted audio frequency susceptibility testing
APPLICATION
The Model 8850-1 Power Sweep Generator was
developed in response to the demand for
increased audio voltage from a low impedance
source when performing CS01 Conducted
Audio Susceptibility tests per MIL-STD-461B/C
and CS101 conducted susceptibility test per
MIL-STD-461D and E. This high power unit is
especially suited for rapidly making tests in
the shielded room.
When used with the Type 6220-1A (or 6220-2)
Audio Isolation Transformer, the combination
enables the injection of sine wave audio voltages
into active power lines supplying power to an
Equipment Under Test (EUT).
DESCRIPTION
The Model 8850-1 Power Sweep Generator
provides audio power in a manually tuned
or sweeping mode for four frequency bands
covering 30 Hz to 100 KHz. Each band can be
swept for one minute, or all bands can be swept
in sequence for one minute.In the manual mode,
a tuning knob controls the output frequency.
Both the frequency in KHz and the output level
in volts r.m.s. are continuously displayed on two
digital meters on the panel.
When used in conjunction with the Type 7021-1
Phase Shift Network and the Type 6220-1A
Transformer, provision is made for sensing
the audio voltage being injected into the EUT
and displaying it on the digital panel meter. In
this arrangement, the unit maintains a constant
injection level (up to a maximum of 7.5 volts
r.m.s.) as frequency is scanned or swept.
Maximum power output of the unit into a
1.5 ohm resistive load is over 300 watts and 200
watts into 2.5 ohms.The output voltage into a 0.5
ohm load connected to the secondary of the
associated Type 6220-1A Transformer can be
adjusted to a level in excess of ten volts at 1.0 KHz.
FEATURES
Manual or automatic frequency sweep from 30
Hz to 100KHz.
Digital display of frequency and output
voltage level or injection voltage level.
Remote sensing of voltage being injected into
the Equipment Under Test.
Automatic leveling of output voltage as
frequency is scanned or swept.
Protective circuits prevent damage to output
stages caused by power frequency feedback in
typical a.c. test setups.
Low output impedance for greater transfer of
audio power.
Up to 300 watts output into 1.5 ohm resistive
load and 200 watts into 2.5 ohms.
AVAILABLE ACCESSORIES
Type 6220-1A Audio Isolation Transformer. Use
for injecting output of 8850-1 in series with power
to test sample as required by test method CS01.
Type 7021-1 Phase Shift Network. Use for
removing the power frequency from the
voltmeter in CS01 tests.
Type 8810-1 Impedance Matching Transformer.
Plugs into output terminals to step up the output
to 50 ohms Impedance. Use when a 50 ohm
signal source is needed.
Type 8811-1 Wide Range Transformer. Plugs
into output terminals to provide up to 115 volts
r.m.s. at 200 watts. Use as a power source for
frequencies from 30 Hz to over 2 KHz.
Type 9138-1 Step-up Transformer. Plugs into
output terminals to provide up to 2 KV into 20,000
ohm load, 3 KHz to 30 KHz.
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MODEL 8850-1 HIGH POWER SWEEP GENERATOR
SPECIFICATIONS
Frequency Range: 30 Hz to 100 KHz in four
bands, manually tunable or by automatic sweep
and continuous display on digital panel meter.
Output Power: 300 watts into 1.5 ohms
200 watts into 2.5 ohms.
Output Voltage: 22 volts r.m.s. maximum at
1 KHz.
Output Current: 15 amperes maximum at 1 KHz.
Output Level: Manually controlled by panel
knob. Continuously displayed on digital
panel meter.
Sweep Duration: One minute for one band
or one minute for all four bands selected by pushbuttons.
Remote Sense: Automatically maintains output
voltage at the level set by the operator, up to
7.5 volts r.m.s., as frequency is scanned or swept.
Frequency Stability: 250 ppm/C.
Output Level Drift: Less than 0.5%.
Overload Protection: Automatic shut down for
excess temperature,over-voltage, or over-current
conditions in output circuit.
Power Requirements: 115 volts 60 Hz,6 amperes
(230 volts 50 Hz, 3 amperes available.)
Size: 8.75" wide, 17.25" high, 13" deep.
(22.22 cm x 43.82 cm x 33.02 cm.)
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