Tektronix DMM4020 Digital-Multimeter, DMM, VFD-Multiple segment, 20000 counts CAT II 600 V DMM4020-A1 Data Sheet
Product codes
DMM4020-A1
Introduction and Specifications
Instrument Security Procedures
1
1-13
Instrument Security Procedures
This section describes the Meter’s memory elements and the procedures for clearing
them.
Volatile Memory
Table 1-1 lists the Meter’s volatile memory elements.
Table 1-1. Volatile Memory Space
Type Size
Function
RAM
2 KB
U44, Microprocessor Memory: Measurement data, user strings, and temporary
configuration information.
configuration information.
Non Volatile Memory
Table 1-2 lists the Meter’s non-volatile memory elements.
Table 1-2. Non-volatile Memory Space
Type Size
Function
Flash
60 KB
U44, Microprocessor Memory: Application program storage.
Flash
256 B
U44, Microprocessor Memory: Not used.
EEPROM
16 KB
U45, IC, Memory: Calibration constants, hardware setup, and user configuration
information.
information.
To clear the volatile memory element listed in Table 1-1 and the non-volatile user stored
instrument front panel setups in Table 1-2:
1. Toggle the power switch located on the rear panel power receptacle off and then on
1. Toggle the power switch located on the rear panel power receptacle off and then on
again to cycle the Meter power. This will return the Meter to default settings.
2. Power on the Meter by pressing P on the front panel.
3. Press the Q button.
4. Press the a through f function keys, in serial, waiting several seconds before
3. Press the Q button.
4. Press the a through f function keys, in serial, waiting several seconds before
pressing each key. This will restore the user front panel instrument setting memory
locations to factory defaults.
5. Press the Q button to exit shift mode.