>> homepage Post messages Homepage:Login:Register:Soul:Top Host 
Forum style Interface Style:  

CMOS/TTL testing Reply  
handsome
puposet
 Using the VP390 to test logic ICs, the test for CMOS 4503, 4508　do not work, even with brand new devices.
the problem is with the tri-state output.　The VP390 does not appear able to consistently test for a
high-impedance output.

Can anyone confirm that this is not just my VP390, but a general design or pattern problem, and is there
any way of testing for Hi-Z outputs or two-supply (level-shifter) devices?

Go back list [ Posted:2016-08-25 05:52:08 ] Edit Administer top

Re:CMOS/TTL testing Reply  
handsome
puposet
 There is also an error with the 40109 level shifter. this appears to be due to it
requiring two positive supplies, the VP390 reports the second "V" pin as "L"
even though it should not be tested.
Go back list [ Posted:2016-08-25 05:54:51 ] Edit Administer Top

Re:CMOS/TTL testing Reply  
handsome
lxl
 please download new software.
Go back list [ Posted:2016-08-25 13:48:34 ] Edit Administer Top

Re:CMOS/TTL testing Reply  
handsome
bladynettel
 Also, there is a VP390 problem but the old one is OK
Go back list [ Posted:2018-08-01 04:35:43 ] Edit Administer Top
Total reply 3 ，total 1 page Forum Previous Next[1]

Reply the topic
Topic: *(Within 40 characters)
Author: *(The username should be within 10 characters)
Password: *(When posted the message for the first time,it will automatically registered)
Verify Code: * 6060
Sex: male female (There is no need to choose if you have registered)
Head portrait: (There is no need to choose if you have registered)
E-mail:
Q Q:
 ICQ MSN
Homepage:
Emoticons:
Ubb label:

Message
body
            (Ctrl+Enter submit)
Web homepage | Contact us | About us

Tianjin Weilei Technology Ltd.

187.50 ms