Tektronix 2715, Руководство пользователя

Страница: 94 / 360

Dedicated Controls
4–22
2715 User Manual
It is also useful if you are used to a spectrum analyzer that may not have digital
display capabilities; since it provides a display you are familiar with and allows
you to see the similarity between the MAX/MIN display and the analog signal.
You can usually obtain a sharper analog display, especially at higher sweep
speeds, by varying the intensity (see INTENSITY on page 4–35) and/or turning
off the on-screen readouts.
4. Activate the D register.
SAVE ENABLE, A, B, C Registers. The SAVE ENABLE key modifies the function
of the [A], [B], [C], and [D] keys. When used with [A], [B] or [C] key, it enables
you to save the current digitizer output in the corresponding register.
NOTE . The CATV mode assumes full control of the waveform storage registers.
Therefore, waveforms stored manually will be erased when CATV mode is
activated at power-up, during a reboot cycle ([UTIL] [5] [0] [9]), or when it is
reactivated after having been disabled.
5. Press [SAVE ENABLE] to manually save a waveform.
The red LED below SAVE ENABLE lights. This indicates that the SAVE
function is armed.
6. Press [A] to save into the A register what is presently being displayed.
The green LED below [A] lights, but observe that the A register was turned
off and remains turned off.
7. Press [D] to turn off the D register.
8. Press [A] to turn on the A register.
Notice that the display does not change with time. The contents of the
A register are not being updated. You are viewing a saved sweep.
9. Now save a waveform into the B register.
10. Activate the B register and ensure the A register is turned off.
11. Set the resolution bandwidth to 30 kHz.
12. Press [SAVE ENABLE] [B].
The current sweep is saved and the B green LED lights. The register remains
active, but because it is now saved, it is no longer updated.
NOTE
. Status of the red LED is not changed by the save operation.