Operating instructions
University of Saskatchewan
Electrical Engineering Laboratory Equipment Manual
The ac/dc coupling option determines whether the trigger signal is ac or dc coupled to the
trigger circuitry. The noise reject option decreases the sensitivity of the trigger circuitry to help
avoid false triggers on noisy waveforms. HF reject low-pass filters the trigger signal with a
cutoff frequency of 80 kHz. LF reject high-pass filters the trigger signal with a cutoff of 300
kHz.
The button marked SET LEVEL TO 50%
sets the trigger level to the vertical midpoint
between the peaks of the trigger signal. FORCE
TRIGGER starts an acquisition even if a valid
trigger signal has not been detected. TRIGGER
VIEW displays the trigger waveform as long as the
button is depressed.
Acquisition and Display Menus
The Acquire and Display menus control how waveforms are displayed by the scope.
Pressing the Acquire menu button brings up the following items:
Sample
Peak detect
Average
Number to average: 4/16/64/128
The Sample mode is the standard display format, and the scope should normally be left in
this mode. The Peak detect mode is useful for examining waveforms that have glitches present.
These narrow glitches will be captured and displayed in this mode. The average mode averages
a set number of waveforms before updating the display. The number to average is selected via
the softkey directly under the average mode softkey.
The Display menu key will bring up the following items:
Display type: vectors/dots
Persistence off – infinite
Display format: YT / XY
Contrast increase/decrease
The display may be set to either the acquired samples themselves (dots) or to
automatically interpolate/fill the space between the acquired samples (vectors). Normally the
display type is left set to vectors. The screen persistence (how long an acquired point is
VERTICAL
HORIZONTAL TRIGGER
POSITION
POSITION
LEVEL
HORIZONTAL
MATH
CH 1 CH 2
TRIGGER
SET LEVEL TO 50%
FORCE TRIGGER
TRIGGER VIEW
POSITION
HOLDOFF
MENU
MENU
MENU
MENU
MENU
VOLTS/DIV VOLTS/DIV SEC/DIV
5V
2mV
5V
2mV
5s
5ns
CURSOR 1 CURSOR 2
AUTOSET
SAVE/RECALL
MEASURE
ACQUIRE
UTILITY
CURSOR DISPLAY
HARDCOPY RUN/STOP
AUTOSET
SAVE/RECALL
MEASURE
ACQUIRE
UTILITY
CURSOR DISPLAY
HARDCOPY RUN/STOP