35
Figure 23 - Rear Panel BNC Output Control
The External BNC port is used as a soft output control. However, it does not
disable the main AC output control, which can be switched by pressing the
button. Thus, when not using the external BNC to control the output
state, ensure that
is pressed to disable the output. The On/Off button’s
backlight LED will turn off.
- O-Sync: Selecting this option will configure the BNC port as a sync output signal,
which will output a 5V TTL logic signal that is synchronized with the main output.
Note: As output frequency increases, there may be an increase of the sync
offset (< 50 µs max.) between the main output and the sync output.
- O-On: Selecting this option will configure the BNC port as an output to monitor
the state of the AC output. A 5 V TTL logic high signal means the output is ON. A
0 V TTL logic low signal means the output is OFF.
3. To exit the BNC port setting menu at any time, press once.
3.5 Dimmer Output Simulation
The power supply features a dimmer output simulation function that allows for users to cut off
part of the mains voltage to vary the RMS voltage fed to the load under test, sometimes
referred to as phase cutting. The range for the phase adjustment is from 0.0 – 180.0 °. This
function also gives two options to cut off the main output voltage by either the beginning of the
sine wave or at the tail end of the sine wave. Cutting off the beginning of the sine wave is called
leading edge dimming and cutting off the end of the sine wave is called the trailing edge
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