Dynalyzer – High Voltage Unit
OPERATION MANUAL
17
lower slope than the voltage waveform and therefore the ripple in the current will be smaller than
the ripple in the three-phase voltage.
Figure 9:
Typical Three-Phase Current Waveform
Fluoroscopic Current Measurements (using Oscilloscope)
For these measurements, the front panel switch should be set to the FLUORO position. Three-
phase fluoroscopic current measurements can be evaluated per the Three-Phase Current
Measurements section above. Single-phase fluoroscopic measurements may fall into two
categories: 1) filtered and 2) unfiltered. The scale factor is 20 millivolt per milliampere. At low
current levels (below 5 mA) in systems with sufficient cable, or external capacitor banks, the
voltage applied to the x-ray tube may appear to be purely direct current. The current waveform will
depend on the location of the Dynalyzer High Voltage Unit with respect to the x-ray tube. Use the
FLUORO position if there is significant low level noise filtering by the amplifier circuitry in the High
Voltage Unit.
Measurements with Accu-Dyn+ system (
see appendix A
)
Measurements with Digital Display
The Dynalyzer Digital Display can be used in conjunction with the high voltage unit to provide the
following five measurements simultaneously:
1. mA and mAs
2. Exposure time (triggered by kV, mA, external trigger or internal (line) trigger
3. kVp of anode or cathode only or both
4. Auxiliary
readout
of filament current
