Fluke 271 User Manual

instrument's AUX OUT socket in order to see the phase 
effects more clearly. 

There are some limitations on using the phase control at 
frequencies above 30 kHz - chapter 5 of the Users Manual 
explains these in detail. 

The instrument has an independently-controlled internal 
trigger generator which produces a square wave with a 
period from 20 µs to 200 s (in 20 µs steps), corresponding 
to a repetition frequency from 0.005 Hz to 50 kHz. In most 
modes the signal is made available at the rear panel 
TRIG/SWEEP OUT 

socket. 

In sweep mode, the sweep begins on the negative edge of 
the signal (the transition from +4 to 0 V; if you include 
markers in the sweep set-up then each marker produces 
an additional narrow +1 V pulse on the 
TRIG/SWEEP OUT 

signal. 

For this tutorial we will generate a logarithmic sine wave 
sweep from 261.6 to 1108.7 Hz. This 2-octave range is 
well within the limits of audibility, so you can listen on 
headphones if you wish. Set the amplitude to about -
10 dBm or you may be surprised by the intensity. 

The description "logarithmic" means that the sweep 
spends an equal period at each note of the scale (and is a 
misnomer because the rate of frequency increase with 
time is in fact exponential). 

The set up process is as follows: 

Press RECALL, 0, ENTER to reset to the factory defaults. 
Then press EDIT and SWEEP. 

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