8
strokes and fewer strokes. After checking, press
【
Reset key
】
.
Select parameter 6, start high voltage:
At this time, the high voltage indicator light is on, high voltage is generated, and the last
four digits of the display show the high voltage value in ten thousand volts. When doing
this inspection, pay attention to the location of the high-voltage line to avoid danger.
④
Select parameter 7, internal data storage check:
The computer in the instrument performs a strict inspection on the internal data memory,
and the display shows the address of the unit being inspected. If an error occurs, the
computer stops the inspection, and the value of the display is the error address. The unit
number is 8000H-9FFFH. When it is close to 9FFFH, press the up and down keys to exit
the check when the check is over, otherwise, repeat the check.
（
3
）
Tube type selection
①
When measuring, first confirm the vacuum bubble tube type. Refer to Appendix 1 or
Appendix 2 in the manual. Enter the curve number corresponding to the vacuum bubble
tube type into the tube type of the instrument display window.
②
If the tube type to be measured is not indicated in the manual, the diameter (outer
diameter) of the vacuum bubble can be measured on site and the corresponding curve
number can be found. It should be noted that the dimensions are as close as possible
when measuring, and the wiring method is the same.
③
Enable [Select key], and then use ↑ key ↓ key to adjust the tube type parameters and
call up the required curve number (see Chapter 2 Instrument Introduction/Performance
Features/Section 3 for details)
④
If there are no alternative parameters, the [calibration key] can be enabled, so that the
ionization current can be directly given. Generally speaking, the ionization current (A) is
about two orders of magnitude smaller than the vacuum (Pa).
⑤
The tube type under test is to select the high position of the selector switch above
10KV, and the low position of the selector switch below 10KV.
（
4
）
Test
①
After the tube type is determined, press the [select key] to exit the selection, and press
the [measurement key]. The instrument then automatically completes all measurement,
calculation, display and other whole processes. If the print key is pressed at this time,
