Option 4, Additional SD
Card for Secure
Environments
The 37xxxE is available with a second Secure Digital memory card
(SD Card) for use in secure environments. This allows the VNA to be
shipped with the System Software and Factory Cal Data on both the
standard and additional SD Cards. When the unit requires periodic
calibration, the 2nd SD Card is installed, allowing the VNA to come
out of the secure environment for calibration, while the initial SD
Card (containing proprietary customer data) remains within the se-
cure environment.

PREPARATION FOR USE INSTALLATION

2-4 37xxxE OM