User Manual

36
Specify Probe Attenuation Factor
Set the channel's attenuation factor to match the attenuation of the probe you are using to
ensure correct voltage or current measurements. To do this, press the 1 button on the front
panel, then press the Probe softkey and turn the Universal Knob to select the desired
attenuation. Push the knob to select the chosen value. The default is 1X. You can also press the
Probe softkey repeatedly to change the channel's probe attenuation factor.
Specify Channel Input Impedance
Select the channel input impedance: 1 MΩ and 50 Ω. Do not exceed a voltage input of more than
5 V absolute value for a 50 Ω impedance input or 400 V absolute value for a 1 MΩ impedance
input. A high impedance of 1 MΩ minimizes loading the device under test.
Press the channel button on the front panel, then press the Impedance softkey to toggle between
1 MΩ and 50 Ω. The default is 1 MΩ. The channel's input impedance is displayed in the channel
label at the right side of the screen.
Specify the Amplitude Unit
You can display the channel's measurement unit as volts (V) or amperes (A). When the unit is
changed, the unit displayed in the channel label will change accordingly. The default setting is V.
1. Press the 1 button on the front panel to display the CH1 menu.
2. Press the Next Page softkey.
3. Press the Unit softkey to select V or A.
Deskew
Use the Deskew softkey to time-coordinate probe measurements, as they can have small delays
that can result in significant power waveform errors. The adjustment ranges from -100 to 100
ns. A common use is to reduce cable length induced delay. Make these adjustments when you
first connect the probes, then subsequently when the measurement hardware or the
temperature change.
Inverting a Waveform
When Invert is set to On, the voltage of each measured point is multiplied by -1, which inverts
the waveform. Note this also multiplies the trigger voltage by -1 so that a stable display is
maintained. Inverting a channel also affects the results of math functions and measure functions.
1. Press the 1 button on the front panel to display the CH1 menu.
2. Press the Next Page softkey to enter the second page of the CH1 function menu.
3. Press the Invert softkey to turn on or off inverting display.