2-3 Measurement Example Chapter 2 — E-Series Tracking Generator
2-4 PN: 10580-00339 Rev. C Tracking Generator MG
Enhancing Accuracy
For detailed power level measurements, the output flatness of the tracking generator can be
calibrated in the field.
1. After the frequency range and other settings are determined, disconnect the DUT and
make a through connection between the GENERATOR/RF OUT connector and the
ANALYZER/RF IN connector. For the most accurate results, use the same cables and
adapters for this connection as were used to connect the DUT.
2. From the Generator > Setting submenu, press Enhanced Generator Power Accuracy.
3. Select the number of external Matching Pad (3 dB) pads to use for calibration and
measurements. Press Enhanced Accuracy Calibration. External attenuators will need to
be inserted for the 3dB and 6dB pad options.
4. Follow the onscreen instructions shown in Figure 2-3 on page 2-5.
During the Enhanced Accuracy Calibration process, the instrument calibrates across
the frequency range, reducing any output ripple. After the successful completion, the
(+Accy) label will be displayed after the Generator output power (Figure 2-5
on page 2-6).
5. Figure 2-4 on page 2-5 is a detail of the top of the filter trace shown in Figure 2-2 before
calibration. Figure 2-5 shows the same trace section after enhanced calibration using
two 3 dB pads.
The 7.5 dB loss from the 0 dBm generator power is from the two 3 dB pads, the filter,
and cables connected between the Generator port and Spectrum Analyzer receiver.
Note
Matching 3 dB external attenuators are not required. Attenuators do provide a
more accurate 50 ohm match to the generator output and analyzer input. This may
help in cases where transmission ripple needs to be minimized.
For the most accurate results, use the same 3 dB pad setup (0, 1, or 2 pads) in
measurements as were used for calibration.
Caution
The Enhanced Accuracy calibrations are eliminated at Preset, Power-on, or when
the generator output level is changed. The calibrations are not saved nor recalled
with Save/Recall.
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