This section describes the types of memory in the VNA Master, how to delete stored user files in internal memory, and recommended usage in a secure environment workplace.
VNA Master Memory Types
The instrument contains non‑volatile disk‑on‑a‑chip memory, EEPROM, and volatile DRAM memory. The instrument does not have a hard disk drive or any other type of volatile or non‑volatile memory.
Disk‑On‑A‑Chip (DOC)
DOC is used for storage of instrument firmware, factory calibration information, user measurements, setups, and *.jpg screen images. User information stored on the DOC is erased by the master reset process described in section Erase All User Files in Internal Memory on this page.
EEPROM
This memory stores the model number, serial number, and calibration data for the instrument. Also stored here are the user‑set operating parameters such as frequency range. During the master reset process, all operating parameters that are stored in the EEPROM are set to standard factory default values.
RAM Memory
This is volatile memory used to store parameters needed for the normal operation of the instrument along with current measurements. This memory is reset whenever the instrument is restarted.
External USB Flash Drive (not included with the instrument)
This memory may be selected as the destination for saved measurements and setups for the instrument. You can also copy the contents of the internal disk‑on‑chip memory to the external flash memory for storage or data transfer. The external Flash USB can be reformatted or sanitized using software on a PC.
Refer to the File Management for additional information on saving and copying files to the USB flash drive.
Erase All User Files in Internal Memory
Perform a Master Reset:
1. Turn the instrument on.
2. Press the Shift button then the System (8) button.
3. Press the System Options submenu key.
4. Press the Reset key, then the Master Reset key.
5. A dialog box is displayed on the screen warning that all settings will be returned to factory default values and all user files will be deleted. This deletion is a standard file delete and does not involve overwriting exiting information.
6. Press the ENTER button to complete the master reset.
7. The instrument reboots, and the reset is complete.
Recommended Usage in a Secure Environment
Set the VNA Master to save files to an external USB Flash drive:
1. Attach the external Flash drive and turn on the instrument.
2. Press the Shift button then the File (7) button.
3. Press the Save submenu key.
4. Press the Change Save Location submenu key, then select the USB drive with the rotary knob, Up/Down arrow buttons, or the touch screen.
5. Press the Set Location submenu key.
The external USB drive is now the default location for saving files.
Note
Not all after‑market USB drives are compatible with the VNA Master. Many drives come with a second partition that contains proprietary firmware. This partition must be removed. Only one partition is allowed. Refer to the individual manufacturer for instructions on how to remove it. You might also try reformatting a drive that contains a single partition using FAT32 format.