Specifications
36
Vertical gain
This adjustment controls the volts per division setting on the vertical scale of the oscilloscope. The
settings change in a 1-2-5 sequence. When this control is pressed, a click is felt and the variable
adjustment feature is turned on for the vertical gain. The adjustments then decrease or increase in 1%
steps of the starting value. The behavior of this adjustment is substantially the same as an analog
scope's; see Variable adjustments for more details.
The gain of both channels is shown in the lower-left portion of the display. Some digital scopes with the
ability to display color will color-code the data to make it easier to identify.
Vertical coupling
This feature works substantially the same as on an analog scope; see Vertical coupling for more
details.
Trigger controls
A digital oscilloscope has an edge trigger that is nominally the same as an analog scope's. Thus, read
the section Trigger controls for an overview.
The digital scope may have more triggering features than an analog scope. For example, the B&K
254xB scopes also have a trigger sensitivity adjustment that adjusts an internal sensitivity and can help
you trigger the scope on more difficult waveforms. In addition, other triggering modes may be available,
such as pulse width triggering or TV triggering. While an analog scope may have the ability to trigger on
video signals, the digital scope will typically provide more features, such as triggering on a particular
video line.
The trigger level adjustment 26 works like it does on an analog scope. A short-cut feature is that
pressing the knob until it clicks sets the trigger voltage to zero.
Pulse width triggering is a feature that allows the scope to trigger on a signal's width. While the name
implies a digital pulse, this triggering mode can be used with any signal. The typical criteria used to
determine when to trigger are:
1. Pulse width less than a given value
2. Pulse width greater than a given value
3. Pulse width equal to a given value
4. Pulse width not equal to a given value
These conditions can be chosen for either the negative-going portion of the waveform or the positive-
going. The width of the pulse is measured at the current setting of the trigger level (knob 26). For the
equal and not equal settings, the width of the acceptance interval is typically around ±10% of the center
of the interval.
Delayed timebase
The delayed timebase on a digital scope operates approximately the same as on an analog scope (see
the Delayed sweep section). However, the screen can be more expressive. Here's a 2542B screen
with the delayed sweep turned on:
All content Copyright © B&K Precision Corporation, except where otherwise noted.
Copying/reprinting/republishing without express written consent prohibited.