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Section HI
Figure 3-4
Model 415E
GAIN
VERNIER
RANGE-08
EXPAND
POWER
INPUT
XTAL IMPED-1
(-BOLOMETER
BIASED
4.5 MA
LOW
B T MA
415 E SWR METER
HEWLETT •
PACKARD
fZi
INPUT
FREQ
f'i
8ANOWIOTH
4I5E-A -158
1. Set POWER switch to OFF. Meter pointer should
rest at 2 on the 0-2 DB scale (if not refer to Par¬
agraph 5-10).
2. Set POWER switch to LINE/ON (or BATTERY/
ON).
6. Adjust RANGE-DB, GAIN, and VERNIER controls
and the amplitude of the input signal for a con¬
venient meter reference near mid-scale.
7. Adjust FREQ control for maximum meter pointer
deflection.
K set to BATTERY/ON refer to Paragraph
3-5 and check battery potential.
3. Set INPUT to desired input impedance. (Note see
Paragraph 3-55.)
4. Connect audio source to INPUT (i.e., crystal de¬
tector, bolometer, audio oscillator, etc.).
5. Adjust modulation frequency (audio input signal)
to approximately 1000 cps.
8. Adjust BANDWIDTH control: fully counterclock-
w i s e rotation is minimum bandwidth and fully
clockwise rotation is maximum bandwidth.
A narrow bandwidth is usually best for low
level signals; 30 cps is convenient for most
applications; and a wide bandwidth is usually
best for fast sweep rate measurements.
Figure 3-4.
General Turn-On Procedure
3-4
02152-2
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