TM 11-6625-1538-15
Model 400E/ELSection III
Paragraphs 3-1 to 3-8 and Table 3-l and Figure 3-2
SECTION Ill
OPERATING INSTRUCTIONS
3-1. INTRODUCTION.b. To operate the Model 400E/EL with battery
power, connect two 35 to 55 volt batteries as
3-2. The Model 400E/EL is primarily an ac voltmetershown in Figure3-2. Since the front panel
and db meter, but it can be used as an ac to dc con-LINE switch has no effect during battery
verter or as a wide band amplifier.operation, the switch in Figure 3-2 can be
used as a convenient method of disconnecting
3-3. This section explains the controls of the 400E/ELthe batteries when the instrument is not in use.
and outlines the operating procedures for each mode
of operation.
3-4. LOCATION OF CONTROLS AND
INDICATORS.
3-5. Figure 3-1shows the location of each of the
400E/EL controls and explains the function of each.
3-6. OPERATING INSTRUCTIONS.
3-7. STANDARD 400 E/EL.
3-8. AC VOLTMETER.
NOTE
Since the 400E/EL is average re-
sponding and rms calibrated, any
distortion will affect the accuracy
of the measurement. Table 3-1
shows the errors caused by dis-
tortion.
Table 3-1. Effect of Distortion on Average Respond-
ing Meter
Figure 3-2. External Battery Connection
c.Turn line ON toggle switch to up position.
LINE lamp will glow.
d.Select approximate range of signal to be mea-
sured.
DO NOT APPLY MORE THAN
600 VOLTS TO INPUT. DO NOT
OVERLOAD THE .001 THROUGH
1 VOLT RANGES WITH MORE
THAN 300 VOLTS AT FRE-
QUENCIES BELOW 300 KC OR
WITH MORE THAN 64 VOLTS
AT FREQUENCIES ABOVE 300
KC. IF ANY OF THESE OVER-
a. Ensure that 115-230 vac slide switch on theLOADS ARE EXCEEDED, THE
INSTRUMENT MAY BE DAMAGED.
rear panel matches line voltage used, and
connect power to the instrument. Mechanically
zero the instrument using the procedure out-e.Connect signal to be measured to INPUT ter-
lined in Paragraph 5-5.minals, and read the rms voltage on the scale.
01788-13-1 |
ACEC
