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The accuracy of an EMI system is affected by every component within the system. Today's EMI systems contain elements that exhibit substantial error or uncertainty, greater than 2.5 dB.
English (United States)
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Automated System for Calibrating a Receiver
The accuracy of an EMI system is affected by every component within the
system. Today's EMI systems contain elements that exhibit substantial error or
uncertainty, greater than 2.5 dB.
Test equipment includes an attenuator (such as model No. HP 8491A)
connected directly to the rf output of a signal generator (such as model No. HP
8662A). The output of the attenuator is connected to the device being calibrated,
such as a receiver or a spectrum analyzer, using a short, double shielded, coax
cable. A control program should provide calibration data in increments of 10 KHz
from 150 KHz to 1.0 MHz and 100 KHz increments between 1.0 MHz and 1000
With the program under computer control, the signal generator will provide a
1000 micro volt output at each of the calibration frequencies. The device being
calibrated will be tuned to the same frequency, and the indicated output plus the
3 dB (attenuator) will be subtracted from the input level. The difference is the
correction factor necessary to provide an accuracy of `1 dB using this device.
The correction data and frequency are stored on disc, and a correction table can
be called up by the program to provide EMI-conducted measurements with
This procedure provides calibration for any basic measuring device, to be
used in a conducted measurement configuration with a Line Impedance
Stabilization Network. However, in order to obtain the increased accuracy for