ELECTRO-METRICS EM-2115 2.0 OPERATING INSTRUCTIONS
(EM2115S2-19)
function can be used to calibrate the oscilloscope (for spectrum analyzer applications) and the X-
Y recorder.
When the front panel Threshold Control is set FULL CCW, the Slideback Detector be-
comes a straight envelope detector. This setting is used in conjunction with an oscilloscope for
spectrum analyzer applications.
2.4.6.5.1 Slideback Detector Aural (Audio) Measurement Technique
NOTE:
Refer to Section 2.6.2 for the procedure to use with an ex-
ternal oscilloscope.
To perform aural (audio) measurements using the Slideback Detector:
a.
Connect a pair of 600
earphones to the front panel Audio Jack and set the Audio
Select Switch to the AM position.
b.
Select the Slideback Detector mode, the widest IF Bandwidth available for the
Frequency Range selected, and set the Threshold Control FULL CCW.
c.
Set the EM-2115 for maximum dynamic range using the procedure in 2.4.6.2.1
Step c.
d.
With the signal tuned-in, hold the earphones to your ear and adjust the front panel
Audio Volume Control for a loud audio signal.
e.
Listening to the audio signal on the earphones, slowly increase the Threshold
Control in a clockwise direction. The audio level on the earphones will decrease
and change in character as the threshold voltage is increased above the back-
ground noise.
f.
If there is a repetitive impulsive input signal, it will have a distinctive clicking or
audio sound depending upon its repetition rate.
g.
Keep increasing the Threshold Control clockwise until the audio sound caused by
the impulsive signal is just extingushed.
h.
Note the amplitude indication on the front panel digital meter. This will be the
peak amplitude of the impulsive signal being checked. With practice, the ampli-
tude levels of several impulsive inputs can be determined.
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