RPM = (SFM x 3.82) divided by DIAMETER. นิ้ว
หรือ. SFMx95.5/ DIA mm
เช่น AL. 300x95.5/6mm =4775 rpm
UPS Pin
|
UPS signal
|
Description
|
1
|
USB_VCC
|
decoupled with a ferrite, and protected
with a 6.2V zener on the PCB side
|
2
|
ON_BATT
|
(active high) - Logic 1: 12V via 3kohm
resistor, Logic 0: 0V via open collector of 2N2222 to gound
|
3
|
\Lo_BATT
|
(active low) - Logic 1: 12V via 3kohm
resistor, Logic 0: 0V via open collector of 2N2222 to gound
|
4
|
GND
|
direct connection, no decoupling
|
5,6
|
USB TST (NC)
|
No physical connection
|
7
|
GND
|
decoupling via ferrite
|
8
|
INVSD
|
Active high to base of a 2N2222 (resistor input
-> base: 3kohms, resistor base -> gnd: 1kohms)
|
9
|
USB Data- (negative)
|
Protected with 47ohms resistors, ferrite
|
10
|
USB Data+ (positive)
|
Protected with 47ohms resistors, ferrite
|
EXEC sys.sp_configure N'remote access', N'1'
GO
RECONFIGURE WITH OVERRIDE
GO
5. เป็น Owner ,สำคัญมาก
USE <newdb>ALTER DATABASE current_db SET TRUSTWORTHY ONตรวจ Owner โดยselect suser_sname(owner_sid) from sys.databases where name = '<newdb>'