General Turn-On Procedure - HP 415E Operating And Service Manual

Section HI
Figure 3-4
Model 415E
. Set POWER switch to OFF. Meter pointer should
rest at 2 onthe 0-2 DB scale (if not referto Par-
agraph 5-10).
. Set POWER switch to LINE/ON (or BATTERY/
ON).
Note
Xt set to BATTERY/ON refer to Paragraph
3-5 and check battery potential.
. Set INPUT to desired input impedance. (Note see
Paragraph 3-55.)
. Connect audio source to INPUT (i.e., crystal de-
tector, bolometer, audio oscillator, etc.).
. Adjust modulation frequency (audio input signal)
to approximately 1000 cps.
INPUT |
XTAL IMPED --51 ро BOLOMETER
GAIN
VERNIER
V RANGE — DB
AND
4i5E-A-I58
. Adjust RANGE -DB, GAIN, and VERNIER controls
and the amplitude of the input signal for a con-
venient meter reference near mid-scale.
. Adjust FREQ control for maximum meter pointer
deflection.
. Adjust BANDWIDTH control: fully counterclock-
wise rotation is minimum bandwidth and fully
clockwise rotation is maximum bandwidth.
Note
А narrow bandwidth is usually best for low
levelsignals; 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
02152-2