Operating instructions

University of Saskatchewan
Electrical Engineering Laboratory Equipment Manual
The time/div (or timebase) is adjusted by the large Time/Div knob. Turn it
counterclockwise to increase the timebase, clockwise to decrease it.
Pressing the Main/Delayed menu button will bring up the following items:
 Horizontal Mode Main/Delayed
 Time Reference Left / Center / Right
 Vernier Off/On
The Main horizontal mode is the standard signal high/low vs. time logic analyzer display
mode. The Delayed mode splits the screen into two; in the top portion are the original
waveform(s), and the bottom holds a time-zoomed version of that waveform(s). The
Time/Div and Delay knobs control the window size and position of the zoomed portion in
this mode.
When on, the Vernier control acts like a fine adjust for the time/div knob.
Normally this control is left off. The time reference position control is self-explanatory.
Trigger Controls
The Edge menu button brings up a list of softkeys that allow
you to specify only one edge (positive, negative, or either) on only
one channel as the trigger condition. The trigger source may also
be chosen to be the external trigger input on the front panel. These
softkeys are self-explanatory.
The Pattern menu button brings up a self-explanatory list of softkeys that allow
you to set a trigger pattern consisting of as many channels as you wish. The pattern
consists of logic highs or lows for each channel, as well as an X (don’t care). In
addition, one and only one channel may be specified as a rising/falling/either edge in
the pattern trigger mode. The external trigger input may also be used as part of the
trigger pattern.
For example, consider the 3 bit counter mentioned previously (channel 0 – Clk, 1
– Q0, 2 – Q1, and channel 3 – Q2). If you wanted to trigger off of the following event:
counter output: 0x5 and a rising edge of the clock, then you would set the trigger
pattern to HLH for channels 3 – 1 (for hexadecimal 5), and a rising edge for channel 0.
The rest of the channels would be set to an X, since you don’t care about their state.
The next time that the analyzer encounters that particular logic pattern on those four
input channels, a trigger will occur.
The trigger mode button brings up only one softkey option: Trigger Mode Auto /
Normal. Much as with the oscilloscopes, when the trigger mode is set to normal, the
analyzer will only acquire data if the specified trigger condition(s) is encountered. When
the trigger mode is set to auto, the analyzer will self-generate triggers even if none are
encountered.
Edge
Pattern
Adv
Main
Delayed
HORIZONTAL
TRIGGER
Delay
Time / Div
1 s
5 ns
Mode