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Section V
Table 5-2
Model 415E
Table 5-2.
Performance Tests (Cont'd)
5.
BANDWIDTH: Variable 15 to 130 cps.
Procedure.
Headings
a.
Connect equipment as shown in Figure 5-1
(omit 355D and AC Voltmeter).
b.
Set 415E to LOW, ON, NORM, 0 (RANGE-DB),
with GAIN and VERNIER full clockwise.
c.
Turn BANDWIDTH full counterclockwise.
Act
qtb
-
Act
=
Difference ( < 15 cps)
=
\Z
<
Act
-
Act
=
Difference ( > 130 cps)
.ejA
=
i
_
d. Tune Oscillator to peak 415E.
e.
Switch 415E EXPAND toO and retune Oscilla¬
tor to be sure that 415E is peaked at center frequency.
f.
Adjust GAIN control for a Odb meter reading.
g.
Tune Oscillator slightly off tuned frequency
causing meter reading to drop to exactly 1. 5 db and
record Counter reading.
h.
Tune Oscillator back to tuned frequency and
then off to other side of tuned frequency causing
meter reading to drop to exactly 1.5 db.
Record
Counter reading.
i.
The difference between the readings of steps
g and h should be 15 cps or less.
j.
Turn BANDWIDTH full clockwise and retune
OSCILLATOR for peak 415E meter reading.
k.
Repeat steps f, g, h above.
m.
The difference between the recorded fre¬
quency readings, this time, should be 130 cps or
greater.
6. SPECIAL 5000 OHM FEED-THRU TERMINATION
In order to measure the 415E operating noise level, a special load must be used to terminate the INPUT in its
optimum source impedance.
For the LOW impedance INPUT, the hp Model 10100B (100 ohms)should be used.
For the HIGH impedance INPUT, a special 5000 ohm termination must be built as detailed below (See Table 5-1
for part stock numbers).
Procedure
a.
Refer to cut away view to left. Unscrew male
BNC and lockwasher from housing by using a 3/8-
inch open-end wrench and holding housing either in
a vise or with gas pliers.
Note
If gas pliers are used housing should be pro¬
tected with tape or heavy paper.
b.
Solder 5000 ohm ±10% 1/4 W resistor to BNC.
RESISTOR*
CONTACT SPRING
* RESISTOR VALUE: 50,100, OR 5K OHM AS REQUIRED
NOTE! entire assembly minus resistor is available
AS 11523-600.
5-6
02152-4
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