268 Agilent InfiniiVision 3000 X-Series Oscilloscopes User's Guide
17 Waveform Generator
2 In the Waveform Generator Menu, press the Settings softkey.
3 In the Waveform Generator Settings Menu, press the Out Load softkey
and turn the Entry knob to select:
• 50 Ω
• High-Z
The output impedance of the Gen Out BNC is fixed at 50 ohms. However,
the output load selection lets the waveform generator display the correct
amplitude and offset levels for the expected output load.
If the actual load impedance is different than the selected value, the
displayed amplitude and offset levels will be incorrect.
To use waveform generator logic presets
With logic level presets, you can easily set the output voltage to TTL,
CMOS (5.0V), CMOS (3.3V), CMOS (2.5V), or ECL compatible Low and High
levels.
1 If the Waveform Generator Menu is not currently displayed on the
oscilloscope's softkeys, press the [Wave Gen] key.
2 In the Waveform Generator Menu, press the Settings softkey.
3 In the Waveform Generator Settings Menu, press the Logic Presets
softkey.
4 In the Waveform Generator Logic Level Presets Menu, press one of the
softkeys to set the generated signal's Low and High voltages to logic
compatible levels:
Softkey (logic levels) Low level High level, 50 ohm
expected output load
High level, high-Z
expected output load
TTL 0 V +2.5 V (TTL compatible) +5 V
CMOS (5.0V) 0 V Not Available +5 V
CMOS (3.3V) 0V +2.5V (CMOS
compatible)
+3.3 V
CMOS (2.5V) 0V +2.5 V +2.5V
ECL -1.7 V -0.8 V (ECL compatible) -0.9 V
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