Introduction
Chapter 1 7
8483A 75 ohm sensor
The 8483A sensor is supplied with an adapter, shown in Figure 1-3. This accessory
is a mechanical adapter only, not an impedance transformer, therefore an impedance
mismatch exists that must be taken into consideration when calibrating the power
meter and sensor. The REF CAL FACTOR, on the power sensor label, has been
adjusted for the impedance mismatch. This REF CAL FACTOR, when used to
calibrate any power meter, will allow calibration to 1.000 mW. The CAL FACTOR,
from the data on the sensor label, should be used for any power measurements in a
75 ohm system at 50 MHz.
CAUTION Remove the mechanical adapter from the power sensor before connecting the sensor
to a 75 ohm source.
Figure 1-3 Mechanical Adapter (8483A Only)
D-model 8480 series sensors (8481D, 8485D, 8485D-033 and 8487D)
D-model sensors are supplied with a 11708A 30 dB attenuator. To calibrate a
D-model sensor, the 1 mW 50 MHz Power Reference supplied by the power meter
must be reduced to 1µW. The reference attenuator provides the means to do this.
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