Fluke Biomedical 199XRAY - Manual (Page 16)

Fluke 199XRAY
Users Manual
2-8
Note:
When measuring kV, the bottom of the trace
(indicated by the A input zero icon “A-“ at the left
of the screen) is not zero. The value at the
bottom of the trace is the zero value for the
selected filter pack. Table 2-1, Default Filter Pack
Settings, lists the zero values for all filter packs.
For example, when using the Wide Range Filter
Pack the zero value is 40 kV. If the kV waveform
is 3 divisions above zero and the vertical
sensitivity is 20 kV/div (60 kV), the measured kV
is 100 kV (40 kV + 60 kV = 100 kV). For more
information, see the 35080/A/B/M User Manual.
These adjustments are automatically performed
for all kV measurements.
Exposure Time Measurements (RADIO only)
Exposure time in milliseconds is measured between the
points corresponding to 75% of kVp-avg on the first rising
edge and last falling edge of the kV waveform.
Exposure time in pulses is measured by counting the
pulses that exceed 75% of kVp-avg during the exposure.
AUTO-kVp Mode, MANUAL Mode
In the AUTO-kVp mode, vertical cursor lines are
automatically positioned to indicate the area used for the
kVp measurement (10…90% area).
In the MANUAL mode you can select between horizontal
and vertical cursors, and you can manually move the
cursors. The cursors allow you to make precise digital
measurements on the waveform manually.
Selecting AUTO-kVp mode – Manual Mode
Do the following to select AUTO-kVp or Manual mode:
Select AUTO-kVp or MANUAL mode.
The right top corner of the screen shows
AUTO-kVp or MANUAL.
To operate the cursors you can turn the cursor menu on:
Turn cursor menu OFF or ON.
F1…F4 key labels for cursor menu OFF:
F1…F4 key labels for cursor menu ON: