Technical data

2 Displaying Data
38 Agilent 3000 Series Oscilloscopes User’s Guide
To adjust the horizontal scale
• Turn the horizontal scale knob to change the horizontal time per
division (time/div) setting (and the oscilloscope’s sample rate — see
“Memory Depth and Sample Rate” on page 67).
The time/div setting changes in a 1- 2- 5 step sequence.
The time/div setting is also known as the sweep speed.
When the time/div is set to 50 ms/div or slower, the oscilloscope enters
Slow Scan mode (see “Slow Scan Mode” below).
When the horizontal scale is set to 20 ns or faster, the oscilloscope uses
sine(x)/x interpolation to expand the horizontal time base.
• Push the horizontal scale knob to toggle between vernier (fine scale)
adjustment and normal adjustment.
With vernier adjustment, the time/div setting changes in small steps
between the normal (coarse scale) settings.
The time/div setting is displayed in the status bar at the bottom of the
screen. Because all channels are displayed in the same time base, the
oscilloscope displays one time/div setting for all channels.
Slow Scan Mode
When the horizontal scale is set to 50 ms/div or slower, the oscilloscope
enters Slow Scan mode.
In the Slow Scan mode, peak detect acquisition is used so that no data is
missed (even the though the Acquire menu may show a different
acquisition mode setting). The oscilloscope acquires sufficient data for the
pre- trigger part of the display, then waits for the trigger. When the trigger
occurs, the oscilloscope continues to capture data for the post- trigger part
of the display.
When using the Slow Scan mode to view low frequency signals, the
channel coupling should be set to “DC”.
The Slow Scan mode lets you see dynamic changes (like the adjustment of
a potentiometer) on low frequency waveforms. For example, Slow Scan
mode is often used in applications like transducer monitoring and power
supply testing.