Keysight Technologies C Series - Page 687

Keysight N9915-90020 User’s Guide 685
Noise Figure Mode (Option 356)
How to Define a Noise Figure Measurement
——Recall ENR Table Opens a menu of file recall
softkeys and displays a list of stored noise source
files.
——
Storage Device [Internal] Opens a menu of
softkeys to set the storage location for your files.
Then choose
Internal (default), SD Card, or USB.
——
Back to return to previous menu.
—
T Cold Default When making measurements at different
ambient temperatures, you can set the T
cold
value in
Kelvin (K) manually (User). When set to Default, the T
cold
value is set to the 296.5 K (Default == Default).
—
Noise Source Control Opens a menu of ENR noise source
control softkey choices. (Active only when ENR Mode ==
Smart (Auto)).
Then choose:
——
Reconnect
Automatically reconnects the
FieldFox to a noise source. If one is not found, the
FieldFox displays "Noise Source is NOT
CONNECTED". Allow 10 to 20 seconds for the
instrument to detect the noise source.
——Auto Load ENR OFF ON When Auto Load is
enabled the FieldFox automatically searches for a
compatible USB noise source and reloads the
stored calibration and temperature data. When
disabled no existing search is made for USB
noise source data to be loaded. (Default == ON)
When Auto Load == ON and compatible USB
noise source is detected (e.g.,
U1832/U1833A/B/C/D) the FieldFox briefly
displays:
"Recalled \temp\U1832A.enr"
When Auto Load == OFF, but a valid USB noise
source is discovered, the following message is
displayed:
"Noise Source Found;ENR file NOT auto
loaded."
——Reload ENR Data Manually reloads any existing
USB noise figure sensor data. This softkey is
inactive/grayed out when a Noise Source is not
detected. When a USB noise source is detected