Key-Down Powerup; Loading New Software; Calibration And Adjustment Procedures - HP 54520 Series Service Manual

CAUTION
WARNING
instrument must average new data with the old, so it takes longer for the waveform to
stabilize. Press Clear display while changing input signals or adjustments.
Clearing the display restarts averaging, which gives a quicker indication of the
result of the change.
Key-Down Powerup
For a key-down powerup, any front panel key is held depressed while power is
cycled. It is the surest way to reset the instrument to default conditions. The
key-down powerup is also the first step toward loading new software through the disk
drive.
The first message during the key-down powerup asks if you want to update system
code (see "Loading New Software" below). If you want to continue with a normal
key-down powerup, you can press any key other than the shift key.
Loading New Software
This oscilloscope stores its operating system code in electrically eraseable PROM
(EEPROM). New code is loaded into the oscilloscope by using the disk drive. A disk
with the current code is shipped with the instrument. It is rarely necessary to reload
the code. You should load the code only if prompted by a troubleshooting procedure,
or if you want to load a later version of code.
The operating systern code is loaded through the key-down powerup. The first
message during the key-down powerup asks if you want to update system code. If
you for any further steps you must do.
Calibration and Adjustment Procedures
The procedures start with the next paragraphs. Unless specified elsewhere,
procedures must be followed in the order given. Display adjustments are optional
and independent of other procedures.
Warm up the instrument for 30 minutes before starting adjustment procedures. Failure to
allow warm-up may result in inaccurate calibration.
SHOCK HAZARD!
Read the Safety information at the back of this guide before performing adjustment
procedures. Failure to observe safety precautions may result in electrical shock.
4-3