Sedecal SHF-310 - Exposure Time Adjustment

HF Series Generators
Calibration
CA-1036R2
5
2.2 EXPOSURE TIME ADJUSTMENT
The values stored in these Extended Memory Locations only affect to Exposure
Times for techniques below 20 ms. The Memory Locations which affect short
exposure times are:
F
U
N
C
T
I
O
N
MEMORY LOCATION
FUNCTION
TUBE-1 TUBE-2
EXPOSURE TIME ADJUSTMENT - DELAY E13 E29
EXPOSURE TIME ADJUSTMENT - Ceq kV E15 E31
The generator has been optimized at the factory to produce correct exposures
at the lower times (<20 ms.) Therefore do not change the value factory set for
E13 and E29 Memory Locations and only adjust the value for E15 and E31
Memory Location according to the HV Cables length.
The Exposure Time adjustment is calibrated by performing the following steps:
1. Enter in c alibration mode by pressing the “Manual Calibration” button on
the GSM Program. Select an available workstation (WS) and press the
“OK” button.
2. Select the E13 (or E29) Memory Location. Value in this Memory Location
adjusts the time delay of the exposure. It is factory set for a value of 17,
18 or 19 (default value is “18”). Only read this value, do not change it.
3. Select the E15 (or 31) Memory Location. Value in this Memory Location
is set in relation to the length in meters of one of the HV Cables
(1 ft = 0.3048 m). Verify the HV Cable length in meters and set the
following value:
HV CABLE LENGTH VALUE TO SET IN MEMORY
4m 27
6m 31
9m 38
12 m 45
14 m 49
16 m 54
For another HV Cable length value = (2.2711 x cables length) + 17.744
4. Store the value of each Memory Location by pressing the “Store” button
of the calibration panel.
5. Exit from calibration mode and record the new values in the Data Book.
6. Repeat the above calibration process for the second tube (memory
locations E29 and E31).