Operating Instructions; Responding Meter - HP 400E Operating And Service Manual

Model 400E/EL
3·1. INTRODUCT ION.
3-2. The ModeI400E/EL is primarily an ac voltmeter
and dB meter, but it can be used as an ac to dc
converter or as a wide band amplifier.
3-3. This section explains
400E/EL and outlines the operating procedures for
each mode of o peration.
3-4.
LO C AT I O N O F
INDICATORS.
3-5. Figure 3-2 shows the location of each of the
400E/EL controls and explains the function of each.

3-6. OPERATING INSTRUCTIONS.

3-7. STANDARD 400E/EL.
3-8. AC Voltmeter.
Table 3-1. Effect of Distortion on Average

Responding Meter

%
Harmonic Distortion
Any 0.1
even 0.5
1.0
2.0
Third 0.1
0.5
1.0
2.0
Fifth 0.1
0.5
1.0
2.0
Depends on phase relationship
*
harmonic and fundamental.
SECTION III
O PERATING INSTRUCTIONS
the controls of the
C O N T R OLS AND
%
ERROR
(*
Fundamental)
Max. Max.
Positive Negative
0.000
0.001
0.005
0.020
0.033 0.003
0.167
0.168
0.338 0.328
0.687 0. 6 67
0 .020 0.020
0. 10 1 0.099
0.195
0.205
0.420 1.380
between
NOTE
Since the 400E/EL
responding and rms calibrated, any
distortion will affect the accuracy
of t he measurement.
s h o w s t he errors
distortion.
a. Ensure that 115/230
the rear panel matches line voltage used, and
connect power to the instrument. Mechani­
cally zero the instrument using the proce­
dure outlined in Paragraph 5-5.
b. To operate the ModeI400E/EL with battery
power, connect two 35 to 55 volt batteries
as shown in Figure 3-1. Since the front panel
LINE switch has no effect during battery
operation, the switch in Figure 3-1 can be
used as a convenient method of discon­
necting the batteries when the instrument is
not in use. Two 35 volt batteries will deliver
approximately 75 rnA
batteries will deliver approximately 50 mAo
WARNING
For operator protection during battery opera­
tion, connect chassis tenninal (MP26) to earth
ground.
c. Turn line ON toggle switch to up position.
LINE lamp will glow.
d. Select approximate range of signal to be
measured.
Do not apply more than 500 volts ac to input.
Do not overload the. 001 through 1 volt ranges.
f
Consult Table 1-2 or overload limits. I
these overloads are exceeded, the ins {rumen t
may be damaged.
Section III
is average
Table 3-1
caused by
V
ac slide switch on
and two 5 5 volt
f f
any o
3-1