Conditions of measurements :
DSO sampling frequency was 50MSPS without filter. All measurements
were done with full load. Measurements were done at cold state and after
15 hours of warming of the power supply with full load.
Single shot measurement ( time domain )
By the DSO were sampled 50000 samples with 20ns sampling time ( 50MSPS) . From this data were computed peak - peak values , average and std error values.
Comparsion table of measured values in ps format and pdf format
Noise of all channels in ps format and pdf format
Axis description of distribution graphs X axis - [mV]
Y axis - [%]
Result :
confirmed that noise
value (max 9 mVpp) is below criteria 20mVpp
Frequency spectrum
In frequency domain is visible that there are not peaks at highest frequencies (switching converter frequencies ).
Stability measurement
Stability measurement was done with resolution 100mV/bit. It is the
ADC resolution in the HV distributor which measure HV on its input ( output
of HV power supply drawn by HV cable ~50m ) . Distribution and u-t graphs
shows very good stability of this voltage.
Graphs are :
1) One day stability in ps format and
pdf format
2) One month stability in ps format and
pdf format
This measurement was not clear stability measurement according specification,
but measurement showing the behavior of output voltage in real action.
The measured values includes long term stability, short term stability,
temperature and load dependencies.
From the distribution is visible few jumps with amplitude
max 0.4V at 900V what is beter than 0.9 V requested