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Rear Panel Input &
Output Connectors
TRIG IN
REF IN
1-12
to place suffix at the end of the parameter. They are also
used for terminating an edit operation
11. Program – Use keypads 1 through 4 to modify the screen to
display channels 1, 2, 3 and 4, respectively. These keys can
be used only when the 2074 is not in edit mode
12. ON/OFF – This key can be used only when the 2074 is not in
edit mode. The ON/OFF toggles output waveform, at the
output connector, on and off.
The 2074 has a number of connectors on its rear panel. These
connectors are described below. Figure 1-6 shows rear panel plugs,
indicators, connectors and other parts.
In general, the trigger input is used for stimulating output
waveforms at the main output connector(s). The trigger input is
inactive when the generator 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. The
trigger input is edge sensitive, i.e., it senses transitions from high to
low or from low to high.
Trigger level and edge sensitivity are programmable for the trigger
input. For example, if your trigger signal rides on a dc level, you
can offset the trigger level to the same level as your trigger signal,
thus assuring correct threshold for the trigger signal. The trigger
level is adjustable from -5 V to +5 V.
The trigger input is common to all channels. Therefore, if the 2074
is placed in trigger mode, all channels share the same mode and
the trigger input causes all channels to start generating waveforms
at the same time. Phase relationship between channels is tightly
controlled in trigger mode and therefore, you should expect the
channels to start generating waves with exactly the same start
phase. Further control of leading edge offset between channels is
also provided.
This SMB connector accepts 10 MHz reference signal. The
reference input is available for those applications requiring better
accuracy and stability than what is provided by the 2074. The
reference input is active only after selecting the external reference
source mode. The reference input, by default, accepts TTL level
signals and the input impedance is 10 k however, the input can
be modified to accept 0 dBm sine waveformsand its impedance
modified to 50 . The modification is done by moving jumpers
internally. Information on the modification is provided to the user
upon request.
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