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SECURITY MEMORY ERASE is typically used to purge all instrument memory locations and registers
after the HP 8340B/41B has been used in highly sensitive or classified applications. This feature
completely erases RAM memory, filling RAM locations with zeros and then with ones. It then sets all
variables and SAVE/RECALL reigsters to instrument preset values, and downloads protected
(ERROM based) Cal Constants into erased RAM (into the Working Cal Constant memory area). The
instrument begins operation in the instrument preset mode.
NOTE: Calibration Constants contain no frequency-specific information.
Activating the Security Memory Erase Feature
Locally:
Press [SHIFT] [MHz] [1] [8] [Hz] [SHIFT] [kHz] [0] [Hz]
Via HP-IB:
SHMZ18HZ SHKZOHZ"
INDICATORS
INSTR CHECK I/ll red LEDs light if the HP 8340B/41B fails the internal self-test that occurs when
[INSTR PRESET] is pressed. If this happens, refer to Section VIII (Service) for further instructions.
Figure 3-12.
Instrument State Keys (3 of 3)
HP 8340B/41B
Operating Information
3-33
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