General Information
Model
8904A
1-7.
ELECTRICAL OPTIONS
Option
001:
Channel Configuration Mode Enhancements.
Three additional
individually-addressable
internal
channels are added for
a
total
of
4
channels. The frequency, phase, amplitude, waveform, and
destination of each channel are individually defined by the user to provide the maximum flexibility of
the instrument. These additional channels provide the following functions:
Modulation
of
Channel
A.
Channels
B,
C,
and
D
can be used
to
generate up to
3
independent forms
of modulation
at
the same time, or they can be summed prior
to
modulating channel
A
to generate
many complex waveforms. The allowable modulation types are:
AM,
FM,
@M,
DSBSC (Double Side
Band Suppressed Carrier), and pulse.
Channel Summation.
Two,
three, or four channels may be summed into a single output.
Two
or three
channels may be summed for modulation of channel
A.
Tone Sequence Mode.
Sixteen user-defined frequencies can be programmed into sequences. Both
the on and off times of each tone can be adjusted.
Dual lone Multi kequency
(DTMF)
Sequence Mode.
The 16 standard Bell Telephone touch-tone
signals
comma@
used in communications signaling can be output. Both the on and off times of each
tone can be user-defined.
Digital Sequence Mode.
Digital data strings can be used in sequences to provide a series of signaling
events. Bit period and on/off levels can be user-defined.
Note:
Hop
RAM
Sequence Mode and
FM
Stereo Composite Generator functions are
only
available
in Option
001
instruments with serial prefixes
2948A
and above. Detailed operating information for
these functions is provided in section
3C.
Hop
RAM
Sequence Mode.
Up to
16
different frequency, amplitude, and phase settings can be preset.
Sequences of up to
750
tones can be built using all 16 states. Sequences of up to
3000
tones can be
built using only
two
states.
Sequences can be output from
1
to 127 times using a ‘burst’ function.
Timing is provided internally for the sequences and
is
adjustable for precise baud rates.
FM
Stereo Composite Generator.
A
flexible
FM
stereo encoder function is added for testing broadcast
receivers. The audio
test
tone frequency, composite signal level, test signal mode, pilot
on/off,
pilot
amplitude, pilot frequency, pilot phase, carrier frequency, and preemphasis are adjustable.
Option
002:
A
second internal channel and output port are added, allowing
two
independent, simultaneously-
operating signals.
Option
003:
The
DIGITAL PORT
on the rear panel of the instrument allows direct TTL- input of control data to
perform the following functions:
1-8
Hop Ram.
Up to 16 phase, frequency, and amplitude states of channel
A
may be preset and directly
addressed. Timing for
fast
hopping must be provided by an external source.
rev.OlNOV89
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
