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Model 400E/EL
Section IIT
Paragraphs 3-1 to 3-8
SECTION II
OPERATING INSTRUCTIONS
3-1.
INTRODUCTION.
3-2.
The Model 400E/EL is primarily an ac voltmeter and db meter,
but it
can be used as an ac to de converter or as a wide band amplifier.
3-3.
This section explains the controls of the 400E/EL and outlines the
operating procedures for each mode of operation.
3-4.
LOCATION OF CONTROLS AND INDICATORS.
3-5.
Figure 3-1 shows the location of each of the 400E/EL controls and ex-
plains the function of each.
3-6.
OPERATING INSTRUCTIONS.
3-7.
STANDARD 400E/EL.
3-8.
AC Voltmeter.
NOTE
Since the 400E/EL is average responding and
rms calibrated,
any distortion will affect the
accuracy of the measurement.
Table 3-1 shows
the errors caused by distortion.
Table 3-1.
Effect of Distortion on Average Responding Meter
% Error (*fundamental)
Harmonic
% Distortion
Max.
VES
SP MeP
S| ere
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Se00/cC000/c000
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* Depends on phase relationship between harmonic and fundamental.
a.
Ensure that 115-230 vac slide switch on the rear panel matches
line voltage used, and connect
power to the instrument.
Ensure
that the meter is mechanically zeroed (400E only).
See Para-
graph 5-5
for the zero adjustment.
3-1
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