Operating Precautions And Warnings - MOXTEK X-ray Sources Operation Manual

I2C Information cont.
Variable Definition
KV
UA
KV
KV
UA
T
T
Bit Decimal
Number Value
1 1
2 2
3 4
4 8
5 16
6 32

Operating Precautions and Warnings

The X-ray source should be ramped up to 140KV to avoid arcing within the tube. If the source has been sitting idle
for a few hours or more, 3 seconds is recommended to ramp up to full voltage and power for the first cycle. The
suggested procedure is to turn the source on at 70KV and 20uA. At 70KV, then take 10KV steps up to 140KV. Finally
turn the filament power up to full output. This should take about 3 seconds. If the source has been running, the ramp
rate time can be decreased to 0.5 seconds. The suggested procedure is to turn the source on at 70KV and 20uA, then
take 10KV steps up to 140KV. Finally turn the filament power up to full output. This should take about 0.5 seconds.
MOXTEK
®
Desired KV
SET
Desired Current
SET
KV monitor positive
MONP
KV monitor negative
MONN
Monitor beam current
bc
Temperature (Kelvin)
K
Temperature (Celsius)
C
Error
Low HV
High HV
Low UA
High UA
High Temperature
Low Temperature
Table 6: Variables Defined
Related Equation
ctrl_vHVSet = KV
ctrl_vUASet = UA
KV = ctrl_vnegHVMon / 169
MONP
KV = ctrl_vposHVMon /169
MONN
UA = ctrl_vUAMon * 0.0094
bc
T = ctrl_vBrdTemp / 16
K
T = T -273.15
C K
Table 7: Bit Description
Description
Will throw an error if +/- KV is 5KV or lower than the set KV
Will throw an error if +/- KV is 5KV or higher than the set KV
Will throw an error if uA is 5uA or lower than the set uA
Will throw an error if uA is 5uA or higher than the set uA. If uA is set to 0,
will throw an error if uA is 10uA or higher
Will throw an error if the internal temperature is 75°C or higher (Will be
adjusted based on environmental testing)
Will throw an error if the internal temperature is -7°C or lower (Will be
adjusted based on environmental testing)
5
* 416.5
SET
* 518.4
SET
Subject to technical change without notice
TUB-MAN-1022 Rev A