Agilent Technologies 83620B User Manual

Amplitude
Modulation
Amplitude mo dulation can be accepted from an external source at
the AM connector or can be internally generated byswept signal
generators with Option 002. The damage level of the AM input is
6 15 V DC. The input imp edance of the AM connector is 50 .
A jumper on the A10 ALC b oard allows you to change the input
imp edance to 2 k (See \Adjustments" in the Agilent Technologies
8360 B-Series Swept Signal Generator/8360 L-Series Swept CW
Generator Service Guide .) The AM can b e scaled either linearly at
100% per volt or exp onentially at 10 dB per volt.
When internal AM is chosen (Option 002), the rate and depth are set
by softkeys in the AM menu. The waveform menu provides a choice
of sine, square, triangle, ramp, or noise waveforms. The monitor
menu lets you output the internally generated mo dulation waveforms
to the rear panel AM/FM OUTPUT connector. The AM output is
scaled the same as it is generated, either 100%/V or 10 dB/V. This
connector can drive 50  or greater. The monitor menu also lets you
display the value of the AM depth.
UNLVLED Message
The maximum leveled output is limited by the swept signal
generator's maximum leveled output p ower sp ecication. (Individual
swept signal generators may b e capable of greater leveled output
power; the unleveled message indicates the actual limit.) Amplitude
mo dulation adds to and subtracts from the reference RF po
wer level.
If an UNLVLED message app ears on the display,you may be trying
to mo dulate b eyond the swept signal generator's maximum output
power capability.
OVRMOD Message
The maximum AM depth is limited to appro
ximately 90% by the
detector's ability to sense lowpower levels. If you try to amplitude
mo dulate to o deep without using deep AM mo de (explained later),
you will see an OVRMOD message displayed on the message line. Also,
if you mo dulate below 0 20 dBm ALC level without using deep AM
mo de or b elow 0 50 dBm with deep AM or search ALC mo de, you
will see an OVRMOD message.
Dynamic Range
The ALC and attenuator combination (when an optional attenuator
is present) are automatically set by the swept signal generator to
keep the ALC in its most accurate range (0 to 0 10 dBm). This is
called the coupled attenuator operating mo de.
For applications where mo dulating across an attenuation switch point
is undesirable, you can uncouple the attenuator and manually set the
power level of the ALC and the attenuator.
For example, setting the p ower level to 0 dBm in coupled mo de will
give an ALC level of 0 dBm and 0 dB of atten
uation. In uncoupled
mo de, the attenuator can be set to 10 dB and the ALC to +10 dBm,
M-14 Operating and Programming Reference

Agilent Technologies 83620B Specifications

General

Brand	Agilent Technologies
Model	83620B
Category	Inverter
Language	English