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Horizontal Control
TDS 620A, 640A, & 644A User Manual
You can also control whether changing the horizontal position setting affects
all displayed waveforms, just the live waveforms, or only the selected wave-
form. The Horizontal Lock setting in the Zoom menu determines which wave-
forms the horizontal position knob adjusts whether zoom is on or not. Specifi-
cally, it acts as follows:
None — only the waveform currently selected can be zoomed and posi-
tioned horizontally
Live — all channels (including AUX channels for the TDS 524A &
TDS 620A) can be zoomed and positioned horizontally at the same time
All — all waveforms displayed (channels, math, and/or reference) can be
zoomed and positioned horizontally at the same time
See
Zoom,
on page 3-162 for the steps to set the horizontal lock feature.
If you are using the FastFrame mode, you can jump to the desired frame.
Press HORIZONTAL MENU ➞ Horizontal Position (main) ➞ Frame and
use the general purpose knob or keypad to enter the frame to jump to. After
you press Enter, that frame should appear on the display.
FastFrame
TM
You can define and enable FastFrame (also called “segmented memory”).
This feature lets you capture multiple acquisitions in the acquisition memory
of a single channel.
Press HORIZONTAL MENU ➞ FastFrame Setup (main) ➞ FastFrame
(side) to toggle on or off the use of FastFrame (see Figure 3-39).
Press Frame Length or Frame Count (side) and use the general purpose
knob to enter FastFrame parameters. The frame length refers to the number
of samples in each acquisition. The frame count refers to the number of
acquisitions to store in the acquisition memory of the channel. The digitizing
oscilloscope will set the record length to a value greater than or equal to the
product of the frame count and the frame length. If the product exceeds the
maximum available record length, the digitizing oscilloscope will reduce the
frame length or frame count in size such that the product will fit the record
length.
Press Horiz Pos (main), then Frame (side), and use the general purpose
knob to enter the number of a specific frame to view.
If you shift the waveform right or left with the front-panel HORIZONTAL
POSITION knob, the window next to the side-menu Frame button will indicate
the frame number of the waveform at the center of the screen.