The Reference Channel - HP 3563A Operating Manual

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Setting Up The Source: Swept Sine Mode
Press A GAIN O N OFF
A GAIN SELECT displays the following softkeys:
REF
CH AN 1
REF
CHAN 2
REF
LEVEL
SOURCE
LIMIT
SOURCE
CHANGE

The Reference Channel

When auto gain is active, the HP 3563A adjusts the level of the swept sine source output to maintain
the specified reference level (entered with
constant input signal level can be maintained to the system under test. By seleeting Channel 2 as the
reference, a constant signal level can be maintained at the output of the system under test. The
reference level can be set from 5 mV to 3 1 .5Vpk.
5-12
to ON to display the A GAIN SELECT
Selects Channel 1 as the reference channel; see "The Reference
Channel" following this description.
Selects Channel 2 as the reference channel; see "The Reference
Channel" following this description.
Sets the reference level for the reference channel; see "The Reference
Channel" following this description.
Sets the source limit value; see "Limiting the Source Output" following
this description.
Sets the tracking resolution of the source to changes in level measured
by the reference input. The default value is 1.0 dB. The minimum
value is 0.2 dB (200 mdB). The maximum value is 1 0 dB. The ability to
control the resolution of the source level allows you to accommodate
the signal-to-noise ratio of your system. If the signal at the reference
input is noisy, set SOURCE CHANGE
reference signal is quiet and noise-free, the source can track more
accurately so you can deerease the value of
tighter control without increasing measurement time.
REF LEVEL).
softkey (see f igure 5-1). Pressing
to a large value. If the measured
SOURCE CHANGE
as
By selecting Channel l
for a
the reference, a