HP 8360 - Manual (Page 465)

Internal Pulse Generator
Width Range: 1 to 65 ms
Period Range: 2 to 65 ms
Resolution: 1
AM and Scan Bandwidth (3 30% depth, modulation peaks 3 below
maximum rated power):
DC to 100
(typically DC to 300
Modulation Depth
(ALC levels noted, can be offset using step attenuator)
Normal Mode: -20
to 1 below maximum available power
Deep Mode 50 below maximum available power .
Unleveled 50 below maximum available power
Sensitivity
Linear:
Accuracy (1
rate, 30% depth, normal mode): 5%
Exponential: 10 dB/volt
Accuracy (Normal Mode): 0.25 of depth in
Incidental Phase Modulation (30% depth): 0.2 radians peak, typical
Incidental FM: Incidental phase modulation x modulation rate
5
Typical AM Distortion
( A L C l e v e l C a r r i e r s
4 - - Deep
- -
R
3
1 - - z R a t e /
1
Rate
- -
0 I I
I I I
0 40 60 80 1 0 0
A M D e p t h
Deep mode offers reduced distortion for very deep AM. Waveform is DC-coupled and
feedback-leveled at ALC levels above -13 At ALC levels below -13 output
is DC-controllable, but subject to typical sample-and-hold drift of 0.25
The HP 8360 has two unleveled modes, ALC off and search. In ALC off mode, the
modulator drive can be controlled from the front panel to vary quiescent RF output
level. In search mode, the instrument microprocessor momentarily closes the ALC loop
to find the modulator drive setting necessary to make the quiescent RF output level
equal to an entered value, then opens the ALC loop while maintaining that modulator
drive setting. Neither of these modes is feedback leveled.
Modulation depth is 40 below maximum available power for frequencies > 20
on HP and HP
5-6 HP 8360
User’s Handbook