This section describes the types of memory in the LMR Master, how to delete stored user files in internal memory, and the recommended usage in a secure environment workplace.
LMR 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.
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 Memory Device (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 memory device for storage or data transfer. The external USB memory device can be reformatted or sanitized using software on a PC.
Refer to File Management for additional information on saving and copying files to the USB memory device.
Erase All User Files in Internal Memory
Perform a Master Reset:
1. Turn the instrument on.
2. If the Menu screen is displayed, press the Esc key.
3. Press the Shift button then the System (8) button.
4. Press the System Options submenu key.
5. Press the Reset key, then the Master Reset key.
6. 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.
7. Press the ENTER button to complete the master reset.
8. The instrument reboots, and the reset is complete.
Recommended Usage in a Secure Environment
To set the LMR Master to save files to an external USB memory device:
1. Make sure the format of the USB memory device is Fat32 in one partition.
2. Attach the external memory device and turn on the instrument.
3. Press the Shift button then the File (7) button.
4. Press the Save submenu key.
5. Press the Change Save Location submenu key, then select the USB memory device with the rotary knob, Up/Down arrow keys, or the touchscreen.
6. Press the Set Location submenu key.
The external USB memory device is now the default location for saving files.
Note
Not all after‑market USB memory devices are compatible with the LMR 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. Some drives can be made to work by reformatting them using the FAT32 format.