11 APD Measurement
AMPTD Y Scale
Key Path
AMPTD Y Scale, Amplitude Unit, Antenna Unit
Example UNIT:APD:POW DBPT
Dependencies Grayed out if no Amplitude Correction with an Antenna Unit is on.
Readback dBpT
Initial S/W Revision A.13.00
dBG
This sets the amplitude unit for the selected amplitude scale to dBG. This is an antenna unit, and this key is
grayed out unless a Correction with this Antenna Unit selected is ON. If this is the case, all of the other
Antenna Units are grayed out.
Key Path
AMPTD Y Scale, Amplitude Unit, Antenna Unit
Example UNIT:APD:POW DBG
Dependencies Grayed out if no Amplitude Correction with an Antenna Unit is on.
Readback dBG
Initial S/W Revision A.13.00
None
This is selected if no Antenna Unit is currently on, however you cannot actually set this value, since it is
always grayed out. The key is included simply to provide an indication on the Readback line of the Antenna
Unit key when there is no Antenna Unit selected.
Key Path
AMPTD Y Scale, Amplitude Unit, Antenna Unit
Readback “None”
Initial S/W Revision A.13.00
Internal Preamp
Accesses a menu of keys that control the internal preamps. Turning on the preamp gives a better noise
figure, but a poorer TOI to noise floor dynamic range. You can optimize this setting for your particular
measurement.
The instrument takes the preamp gain into account as it sweeps. If you sweep outside of the range of the
preamp the instrument will also account for that. The displayed result will always reflect the correct gain.
For some measurements, when the preamp is on and any part of the displayed frequency range is below
the lowest frequency for which the preamp has specifications, a warning condition message appears in the
status line. For example ,for a preamp with a 9 kHz lowest specified frequency: "Preamp: Accy unspec’d
below 9 kHz".
EMI Receiver Mode Reference 905
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