3162A/B User Manual
Getting Started 1-6
Main Output -
Channel A
The main output A connector outputs standard, user, sequenced, and
modulated waveforms. Output impedance is 50
Ω.
That is, the cable connected
to this output should be terminated with 50
Ω
. Output amplitude accuracy is
calibrated when connected to a 50
Ω
load. If the output is connected to a
different load resistance, determine the actual amplitude from the following
equation:
The output amplitude is doubled when the output impedance is above 1 M
Ω
.
Main Output -
Channel B
The main output B connector outputs standard, user, sequenced, and
modulated waveforms. Phase offsets, accuracy and jitter are tightly controlled
between the two main outputs. Main output B impedance is 50
Ω.
While
amplitude, offset and waveform controls are separate for each channel, all other
parameters are common (i.e., sample clock, trigger mode, etc.).
SYNC Output
The SYNC output generates a single TTL pulse for synchronizing other
instruments (e.g., an oscilloscope) to the output waveform. The SYNC signal
always appears at a fixed point relative to the waveform. The location of the
SYNC signal along the waveform is programmable.
Trigger/PLL/FSK
Input
The trigger input accepts signals that stimulate the Model 3162B to output
waveforms. The trigger input is inactive when the instrument is in continuous
operating mode. When placed in trigger, gated or burst mode, the trigger input
is made active and waits for the right condition to trigger the instrument. In
trigger and burst modes, the trigger input is edge sensitive, i.e., it senses
transitions from high to low or from low to high to trigger the Model 3162B. The
direction of the transition is programmable. In PLL mode, the trigger input is
used as a phase reference input. In FSK mode, the trigger input is used as a
frequency shift control. The FSK input is level sensitive, i.e., the Model 3162B
outputs carrier frequency when the level is low and shifts to a pre-programmed
frequency when the level is high. Trigger level sensitivity may be programmed
for the trigger input.
In gated mode, the trigger input is level sensitive, i.e., the Model 3162B is
gated when the a logic level is high and idle when it is low.
AM/PM Input -
The channel A AM input accepts signals that amplitude modulate the channel
A main output signal. The channel A PM Input accepts signals that phase
(
)
V
V
out
prog
=
+
2
50
50
Ω
Ω
R
L
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