Testing voice-based office equipment for immunity to interference from wireless devices
According to some embodiments, a method includes placing a device under test (DUT) in a test chamber and applying a pulse-modulated RF wireless test signal to the DUT in the test chamber. The method further includes detecting an acoustic output of the DUT. In addition or as an alternative to applying the pulse-modulated test signal, the test signal strength may be at a level of 30 V/m or 90 V/m. If the DUT is a telephone, it may be coupled via a voice signal path to another telephone, and an output of the other telephone may also be detected.
1. A method comprising:
placing a device under test (DUT) in a test chamber;
wirelessly applying a pulse-modulated radio frequency (RF) test signal to the DUT in the test chamber using an antenna; and
detecting a power level of an acoustic output of the DUT with a receiving device, wherein the acoustic output is in a range of 20 Hz to 20 kHz.
2. The method of claim 1 , wherein the DUT is a telephone.
3. The method of claim 2 , wherein the telephone is a speakerphone.
4. The method of claim 1 , wherein the DUT is a microphone.
5. The method of claim 1 , wherein the test signal is a 100 Hz repetition of a 100 microsecond pulse.
6. The method of claim 5 , wherein the applying step includes varying an RF carrier frequency in a range of 800 MHz to 6.0 GHz.
7. The method of claim 1 , wherein the receiving device is an RF immune microphone in the test chamber.
8. The method of claim 1 , wherein a wireless mobile telephone is a source of the pulse-modulated RF test signal.
9. A method comprising:
placing a device under test (DUT) in a test chamber;
wirelessly applying a radio frequency (RF) test signal to the DUT in the test chamber using a mobile wireless telephone; and
detecting a power level of an acoustic output of the DUT in a range of 20 Hz to 20 kHz using a receiving device and a bandpass filter;
wherein the test signal has a strength of at least 30 V/m in at least a portion of the test chamber.
10. The method of claim 9 , wherein the test signal has a strength of at least 90 V/m in at least a portion of the test chamber.
11. The method of claim 9 , wherein the DUT is a telephone.
12. The method of claim 11 , wherein the telephone is a speakerphone.
13. The method of claim 9 , wherein the receiving device is a telephone connected to the DUT.
14. An apparatus comprising:
a test chamber;
an antenna in the test chamber;
test signal means, coupled to the antenna, for applying a wireless pulse-modulated RF test signal to a device under test located in the test chamber using the antenna; and
means, associated with the test chamber, for detecting and measuring an acoustic output level of the device under test, wherein the acoustic output is in a range of 20 Hz to 20 kHz.
15. The apparatus of claim 14 , wherein the wireless RF test signal has a strength of at least 30 V/m in at least a portion of the test chamber.
16. The apparatus of claim 15 , wherein the test signal means includes a control device programmed to cause the test signal means and the antenna to generate the wireless RF test signal in the test chamber having the strength of at least 30 V/m in at least the portion of the test chamber.
17. The apparatus of claim 15 , wherein the means for detecting and measuring comprises a coupler, an amplifier, and a bandpass filter.
18. The apparatus of claim 15 , wherein the test signal means is configured using a wireless telephone and the means for detecting and measuring comprises an RF-immune microphone.