BNC 645 - Manual (Page 25)

25
limited. For example, the built-in Sinc wave does not span the full
±1 range and thus its maximum amplitude is limited to 6.087 Vpp
(into 50 Ω).
• While changing amplitude, you may notice a momentary
disruption in the output waveform at certain voltages due to
switching of the output attenuators. The amplitude is controlled,
however, so the output voltage will never exceed the current
setting while switching ranges. You may disable the voltage
autoranging to prevent this output disruption.
3.6 To Set DC Offset Voltage
The default DC offset voltage is 0 volt for all functions. To specify a
non-zero DC offset value, follow the steps below.
Front-panel Operation
1. Select your desired function by pressing one of the function keys.
2. Press the softkey under Vos/Low and make sure Vos is highlighted.
Use the numeric keypad or the knob with cursor keys to change
the value.
DC offset setting can also be changed from the Utility menu.
1. Press the Utility button.
2. Press the softkey under DC to toggle between DC ON and OFF.
Make sure ON is selected on the display. Use the numeric keypad
or the knob with cursor keys to change the value.
Remote Interface Operation
VOLTage :OFFSet {<offset>|MINimum|MAXImum}
Notes
• Specifying a high (voltage) level and a low level (Section 3.7) is
equivalent to specifying amplitude (Section 3.5) and DC offset.
For example, if you set the high level to +2 volts and the low level
to -3 volts, the resulting amplitude will be 5 Vpp, with DC offset at
-0.5 V.