User manual

3390-900-01 Rev. C / January 2009 Return to Section Topics 4-5
Model 3390 Arbitrary Waveform Generator User’s Manual Section 4: Setup Basics
Setting pulse high and low levels
You can set a high and low level versus specifying amplitude and DC offset. Parameters are
calculated as follows:
Amplitude = |High Level| + |Low Level|
Offset = (High Level + Low Level) / 2
To set pulse high and low levels:
1. Press the function key for your selection.
2. Press the soft key under Ampl / High. Ensure High is highlighted.
3. Use the navigation wheel with the cursor keys, or the numeric keypad to change the value.
You can change the units by using the numeric keypad in combination with the soft keys.
4. Press the soft key under Vos / Low. Ensure Low is highlighted.
5. Use the navigation wheel with the cursor keys, or the numeric keypad to change the value.
You can change the units by using the numeric keypad in combination with the soft keys.
To set pulse high and low levels from a remote interface:
VOLTage:HIGH {<voltage>|MINimum|MAXimum}
VOLTage:LOW {<voltage>|MINimum|MAXimum}
Setting waveform polarity
Waveform polarity can be specified as normal or inverted. When a non-zero offset is specified, the
waveform is inverted relative to the offset voltage, and the offset remains the same in the inverted
waveform. An inverted waveform does not affect the associated sync signal.
To set waveform polarity:
1. Press the Utility key, and then press the soft key under Output Setup.
2. Press the soft key under Norm / Invt to choose between normal and inverted (Figure 4-5).
Ensure your selection is highlighted.
3. Press the soft key under DONE to finish your selection.
Figure 4-5:
Setting waveform polarity
To set waveform polarity from a remote interface:
OUTPut:POLarity {NORMal|INVerted}
Setting output termination
The default output impedance to the front-panel Output connector is 50 Ω. The termination setting
is stored in nonvolatile memory and remains after a remote interface reset, or the instrument
power is turned off.
NOTE If the actual load impedance does not match the value specified, the output
amplitude and offset levels will be incorrect. Invalid results may occur.