Giga-tronics 8003, Operation Manual

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8003 Precision Scalar Analyzer
2-82 Manual 20791, Rev. C, June 2001
2.9.5 Three-Sensor Configurations
Three-sensors typically measure both power through the device and power reflected from the device,
ratio’ed with the monitored incident power level.
Typically, two channels display insertion loss and return loss simultaneously. See the discussions for two
channel insertion loss and two channel return loss measurements to define the channels and path cal
the sensors.
2.9.6 Trace Memory
Trace memory is a powerful tool to normalize the displayed trace with either a golden standard or a
particular reference device. In almost every case, a standard path cal could perform the same function.
But trace memory can serve an additionally useful function.
Suppose you want to compare several components to a ‘golden standard’ component. After performing a
path cal, you would measure the golden standard to find its characteristics (see Figure 2-37 for an
example of golden standard measurement results).
Ideally, you would then like a way of memorizing this trace and subtracting it from subsequent traces on
your other DUTs so that you could see how much variation the other DUTs had from the standard.
That is exactly what trace memory allows you to do. To memorize the golden standard trace, press
[DEFINE]
then press the [ MEAS ] softkey. The analyzer stores up to 10 traces; you must first tell it
which of the 10 memory registers you want the trace stored in. You do this by pressing the [ TRACE-
TRACE N ] softkey followed by a number from 0 to 9, followed by the
[GHz/dB]
units key. To actually
perform the subtraction of a DUT-Golden standard, press [ MEAS-TRACE N ] followed by the number
of the trace to be subtracted (0 to 9), followed by the
[GHz/dB]
units key. The trace should now
indicate differences between the DUT and the golden standard. To return to normal trace display, press
the [
MEAS ] softkey.
Figure 2-36: Three Sensor Configuration Block Diagram