ETS-Lindgren 7606 Coil Antenna/Shielded Coil - Manual (Page 28)

C ALIBRATION S TEPS
1. Set the signal source to a frequency of 1 kHz and adjust the output to
provide a magnetic flux density of 110 dB(pT) as determined by the
reading obtained on instrument A and the relationship
B = 160 dB(pT/A). This requires a current of -50 dB(A) or 3.16 mA.
To determine the current, algebraically add the current probe
correction factor in dB(S) to the reading in dB(mV) on instrument A; for
example:
2. Measure the voltage output in dB(µV) from the Model 7606 on
instrument B.
3. Verify that the output from the Model 7606 is 42 dB(µV) ±3 dB, and
record this value.
If the output from Model 7606 is not within ±3 dB of 42 dB(µV), verify the source
current is set correctly, and then look for other causes. Some possible causes
are:
• Inaccuracy in either or both measuring instruments.
• Malfunction of either or both measuring instruments.
• Inaccuracy in the current probe.
• Loose clamping or other malfunction of the current probe.
• Damage to the current probe.
• Magnetic-field coupling between Model 7605 and the current probe or
measuring instruments.
• Loose fit between Model 7605 and Model 7606, or other incorrect
assembly.
• Damage to Model 7605 or Model 7606.
• Metallic objects, particularly magnetic materials, in close proximity to
Model 7605 and Model 7606.
28 | MIL-STD-462D Method RS101 Testing