9
the measurement result will be printed.
②
The measurement steps performed by the computer in the instrument are as follows:
Start the high voltage → measure the leakage current → turn off the high voltage → turn
on the charging switch → the voltage reaches the specified value → start the magnetron
current, measure the leakage c ionization current, → deduct the leakage current
→ convert the current into a vacuum value → display. If the [calibration key] is valid, the
current value will be displayed.
4.About test results
(1) After the test shows that the current value is zero, you should check whether the
surface of the arc extinguishing chamber is clean, because the surface is dirty, which
may cause the leakage current to change value greater than the ionization current value.
In this way, the measured value after subtracting the leakage current is less than zero
and the instrument judges If this happens, wipe the surface of the arc extinguishing
chamber and do the test again. Generally speaking, the vacuum degree obtained in this
way is higher.
(2) Based on the first measured value, the vacuum degree obtained by continuous
multiple measurements will gradually increase, which is higher than the actual vacuum
value of the interrupter. If multiple measurements must be taken, the time interval
between each measurement is about one week.
VII
、
Packaging list
No.
Name
Qty
1
Magnetron current
output line
1
2
Negative ion wire
1
3
Ground wire
1
4
Fixed strap
1
5
printer paper
2
6
power cable
1
