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Section V
Table 5-2
Model 415E
Table 5-2.
Performance Tests (Cont'd)
2.
NOISE: At least 7.5 db below full scale at rated sensitivity and maximum bandwidth with input terminated
in optimum source impedance
Procedure.
a.
Connect equipment as shown in Figure 5-1
(omit 355D from setup).
b.
Set 415E to NORM, 0 db, HIGH, and ON with
GAIN, VERNIER, FREQ, and BANDWIDTH controls
full clockwise.
c.
Set 355C to
0 db and tune Oscillator to peak
415E.
d.
Adjust Oscillator output for 1. 0 volts RMS AC
Voltmeter reading.
e.
Adjust 415E GAIN for 0 db meter reading and
remove connections from 415E.
f.
Connect special 5000 ohm feed-thru termina¬
tion to INPUT (See Procedure 6 of this table).
g.
Set 415E RANGE-DB to 60. The average noise
level indicated by meter pointer should be at least
7. 5 db down from 0 on the 0 to 10 db scale.
h.
Switch INPUT to LOW and repeat steps b and
c above.
i.
Adjust Oscillator output for 0. 15 volt RMS AC
Voltmeter reading.
j.
Adjust 415E GAIN for 0 db meter reading and
remove connections to 415E.
k.
Connect Model 1Q100B Feed-Thru Termination
to INPUT.
>,
.
*.•!>•,
,
m.
Repeat step g above. The average noise level
should be 7.5 db down from 0 on 0 to 10 db-scale.
Readings
Min
Act
(High)
(Low)
Max
-7.5 db
-7.5 db
3A.
RANGE ACCURACY: ±0. 05 db/10 db step; maximum cumulative error ±0.10 db
Procedure.
a.
Connect 415E as shown in Figure 5-1
(omit
Readings
Min
Act
Max
Counter and AC Voltmeter).
9.95 db
- €> °
10.05 db
b. Set 415E to ON, LOW,
0 (RANGE-DB),
0
(EXPAND), with GAIN full counterclockwise.
19.9 db
Ao. O (_
20.1
db
c.
Set 355C to 5-db and 355D to 0 and adjust
29 ..9 db
30.1
db
Oscillator frequency for peak 415E meter reading.
39.95 db
¥ 'o,o /
40.05 db
4 Adjust Oscillator output and 415E VERNIER
for x db meter reading on 0 to
2
db scale.
49.9 db
50. 1
db
e. Switch 355D to 20 db and 415E RANGE-DB to
59.9 db
47.
°tf
60. 1
db
10.
The 415E meter reading should be 1.0 db
±0. 05 db (See Note 1).'
l||||
f.
Switch 355D to 40 db and 415E to^20.
415E
to 20.
415E should read 3.0 db ±0. 1 db."
5-4
02152-2
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