User`s guide

4-160 Agilent E6432A Microwave Synthesizer User’s Guide
HPE6432_SetAmMode
ViStatus HPE6432_SetAmMode (ViSession instrumentHandle,
ViBoolean amMode);
Purpose
This function selects either exponential or linear AM mode; this setting
affects the current instrument state as well as the list.
When the synthesizer is in linear AM mode, the input accepts a –1 Vp
to +1 Vp signal. The RF output level (the reference power level) is
affected by the AM input level as follows:
Therefore, there must be greater than or equal to 3 dB of margin
between the reference power level and the maximum available at a
given frequency. The unmodulated (0 V input) to modulated (–1 Vp
input) ratio is a function of power level and frequency, but is always
greater than 20 dB. The amplitude of the RF output changes linearly as
the AM input changes. The input impedance for this input connector is
factory set at 2 kilohms. Damage levels for this input are greater than
or equal to +15 Vp, or less than or equal to –15 Vp.
When the synthesizer is in exponential AM mode, the input accepts a
wider range of input signal. The RF output level (the reference power
level) is affected by the exponential input level as follows:
The dynamic range of the positive to negative power levels is dependent
on the synthesizer power level setting. The input impedance for this
input connector is factory set at 2 kilohms. Damage levels for this input
are greater than or equal to +15 Vp, or less than or equal to –15 Vp.
Factory Preset Value: Linear
Linear Input Level RF Output Level
0 V Unaffected
–1 Vp Minimum Power
+1 Vp 100% (3 dB) Higher
than the Reference
Power Level
Exponential Input Level RF Output Level
0 V Unaffected
–1 Vp Decreases by 10 dB / –1 V
+1 Vp Increases by 10 dB / +1 V