Bnc 645 User Manual download pdf (Page 26)

•

Figure 3-8

• Limits with amplitude and output termination: DC offset value is

constrained by the equation below:

Vpp

Vmax Voffset −≤

where Vmax is the maximum peak voltage allowed for the

selected output termination (5 volts for a 50 Ω load or 10 volts for

a high-impedance load).

If the specified dc offset is not valid, the waveform generator

automatically adjusts it to the maximum value allowed with the

specified amplitude.

•

Arbitrary Waveforms Limitations: For arbitrary waveforms, if the

waveform data points do not span the full range of output DAC

(Digital-to-Analog Converter), the maximum offset and amplitude

will be limited.

•

For dc volts, the output level is actually controlled by setting the

offset voltage. You can set the dc level to any value between ±5

Vdc into 50 ohms or ±10 Vdc into an open circuit.

3.7 To Set High-Level and Low-Level Bounds

Setting high-level and low-level bounds provides an equivalent way to

specifying amplitude and DC offset. The procedure is as follows.

Front-panel Operation

1. Select your desired function by pressing one of the function keys.

Press the softkey under Ampl/High to toggle and make sure the

High is highlighted. Use the numeric keypad or the knob with

cursor keys to change the value.

Press the softkey under Vos/Low to toggle and make sure Low is

highlighted. Use the numeric keypad or the knob with cursor keys

to change the value.

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Bnc 645 User Manual Page 26