Hi there,
I am using the function generator U2761A. When I use the SCPI command:
APPL:SIN 2000, 1 VPP, 0
as described in the programmer's manual for SCPI commands, the output is a sine wave ranging from +1V to -1V. I believe the definition of VPP (peak to peak) should extend from +0.5V to -0.5V when there is a DC offset of 0V. Can you please offer an explanation of this observation? Does VPP in this case represent "peak-to-peak"? To help out, when I query for the amplitude "high" and "low", I do receive +0.5V and -0.5V respectively. The output load is set to 50Ohm.
Thank you in advance.
I am using the function generator U2761A. When I use the SCPI command:
APPL:SIN 2000, 1 VPP, 0
as described in the programmer's manual for SCPI commands, the output is a sine wave ranging from +1V to -1V. I believe the definition of VPP (peak to peak) should extend from +0.5V to -0.5V when there is a DC offset of 0V. Can you please offer an explanation of this observation? Does VPP in this case represent "peak-to-peak"? To help out, when I query for the amplitude "high" and "low", I do receive +0.5V and -0.5V respectively. The output load is set to 50Ohm.
Thank you in advance.
I haven't used this particular function generator, but this is a pretty common function generator question. Usually the cause is the impedance of the measuring device or DUT. DMMs, and most/not all oscilloscopes are high impedance. The output impedance of the function generator is a fixed 50 ohms so when an output is applied to a Hi-Z device, the value appears to be double what you would expect. Here is a previous post for a different fgen I made. The explanation should apply to this function generator as well:
The output Voltage is twice/double the value I set.