RIGOL DG1000Z Series User Manual

Page 138

RIGOL

Chapter 2 Front Panel Operations

2-88

DG1000Z User’s Guide

Output Impedance

The output impedance setting influences output amplitude and DC offset. The

instrument has a 50Ω fixed serial output impedance for the [CH1] connector at

the front panel. If the actual load is different from the specified value, the

voltage level displayed would not match the voltage level of the device under

test. To ensure correct voltage level, the load impedance setting must match the

actual load.

Press Utility  Channel Set  Output Set  Imped to select “HighZ” or
“Load”. The default is “HighZ”. If “Load” is selected, use the numeric keyboard to

set specific impedance value. The default is 50Ω and the available range is from

1Ω to 10kΩ. Impedance setting will be displayed on the screen.

The generator will adjust the output amplitude and offset voltage automatically

once the impedance setting is changed. For example, the current amplitude is

5Vpp. At this point, change the output impedance from 50Ω to HighZ and the

amplitude displayed on the screen will double to 10Vpp. If the output impedance

is changed from HighZ to 50Ω, the amplitude will reduce to half of the previous

value (2.5Vpp). Notice that only the displayed values change with the parameter

and the real output from the generator does not change.

Output Mode

Set the output mode of the [CH1] connector as normal or gated. In gated mode,

the output state of the [CH1] connector is controlled by the signal from the

[CH1/Sync/Ext Mod/Trig/FSK] connector at the rear panel. When “Gated”

is selected, press “Polarity” to select “Pos” or “Neg”.
 Positive: the [CH1] connector ouputs signal when the gated signal is high

level.

 Negative: the [CH1] connector ouputs signal when the gated signal is low

level.

Range

Press Utility  Channel Set  Output Set  Range and select “Auto” or
“Hold”.
 Auto: the generator selects the best settings for the output amplifier and

attenuator automatically.

 Hold: disable the automatic optimization, which can eliminate the

discontinuation of the waveform caused by the relay switch when changing

the amplitude but may affect the amplitude accuracy.