• LFPA 9733 C, 5 Hz - 1 MHz, Low Frequency Power Amplifier
  • LFPA 9733 C, 5 Hz - 1 MHz, Low Frequency Power Amplifier
  • LFPA 9733 C, 5 Hz - 1 MHz, Low Frequency Power Amplifier

LFPA 9733 C, 5 Hz - 1 MHz, Low Frequency Power Amplifier

  • Low Frequency Amplifier
  • 5 Hz - 1 MHz  
  • Typical gain: 26 dB +/- 3dB
  • AC Output Current: 28A-RMS

PARTNER:

MARKETS:

CATEGORIES:

TEST STANDARDS:

Data Sheet

SPECIFICATIONS

LFPA 9733 C, 5 Hz - 1 MHz, Mil 461 Low Frequency Power Amplifier

Overview

The LFPA 9733 C is a multi-purpose power amplifier and can be used within the frequency range from 5 Hz to 1 MHz. Typical applications are magnetic immunity testing according to automotive standards and MIL-461.

Its new output stage design allows for higher output in the high frequency range. Additionally it features a galvanically isolated input. Additionally unsymmetrical signals (as defined in GMW 3097) can be processed

 

 
Specifications:  
Frequency range (nominal): 5 Hz - 1 MHz 
Gain (without load) 26dB +/- 3dB
AC Output current: (50% duty cycle up to 5 min.) 28A rms
AC Continuous operating current: 14A rms
Impedance of load min.: 0.25 ohm
DC output current: 10 A
Max. output voltage: 60 Vpeak @ 5 Hz - 250 kHz Linearly decreasing to 30 Vpeak @ 1 MHz
Max. output current: 40A peak
Typical input impedance: 1kOhm
Input jack: BNC (isolated)
 Output Connectors:  Wing terminals
Ambient temperature: -10° … +400°C
Power supply: 230 VAC
Current consumption: 16Arms
The material of the housing: Aluminum
Housing dimensions: 448 x 410 x 268 mm
Overall dimensions: 448 x 473 x 280 mm
Weight: 40 kg

 

Hazard warning: The amplifier must be disconnected from mains every time if wires are being connected or disconnected.

Attention: During operation high voltages occur at the terminals of the LFPA 9733 C. If used in an inappropriate way this could lead to a life threatening situation for the user.

Shock Hazard!

Protection circuitry: Compared to off-the-shelf audio amplifiers the LFPA 9733 C is designed for high duty cycle operation under high loads. This results in a serious size and weight increase compared to typical PA amplifiers. But to keep the amplifier weight and size within reasonable limits, it was impossible to design the amplifier for continuous duty at maximum output current. Therefore the amplifier has been designed to exceed the requirements of typical immunity tests by a large margin.

In the rare case of an actual thermal overload (e.g. caused by continuous sine-wave load at maximum current), it will warn the user and turn off, if no countermeasures are taken.  

In case of short-term overload the LFPA 9733 C will not turn off, but reduce the output voltage. This allows to continue the test in case of transient disturbances. Note that this behavior is different to the predecessor LFPA 9733.

In addition to voltage and current overload protection, an additional SOA protection (safe operating area) is incorporated.

The amplifier’s display shows whether protection circuits are active. Additionally the user is warned by a beep.

When performing conducted immunity testing with the LFPA 9733 C the coupling transformer used works in both directions. It can therefore couple reverse power from the EuT supply into the amplifier. Due to its internal feedback circuitry the amplifier will work against the externally driven current, causing approx. 100 watts of power dissipation per ampere. Note that the voltage is of no significance, ince the amplifier’s feedback will keep the output near zero volts.  This additional power dissipation adds to the power dissipation caused by normal operation of the amplifier and stresses the thermal and SOA budget of the output devices. Additionally the internal protection circuitry has no means of dealing with reverse power.

 

If significant output current can be seen without input signal or protection circuitry kicks in, turn of the test setup and fix the underlying issue.

See data sheet for more operational information.

 
OTHER PRODUCTS IN THE SAME CATEGORY:
Loading...