 |
|||
|
Page Title:
Circuit board assembly test procedure |
|
||
| ||||||||||
|
|  MIL-P-70624A(AR)
4.5.2.4 Circuit board assembly test procedure.
a. Turn on board power per para. 4.5.2.1, the
signal
generator and power to switches S1 and S2 (as shown in
Figure 3).
Voltage at Pin E should be 13 1 volts the first 6-10
seconds and
after that should read less than 1 volt. Pin U should
read 13 1
volts.
b. Turn signal generator to 1200 HZ and activate S3.
Voltage at Pin E should be 13 1 volts and Pin U less than 1 volt.
Voltage at Pin U should be 13 1 volts.
Press S2.
c.
d.
Set signal generator to 1450 HZ, 10V P-P.
e. Set S1 to `NORMAL". Use a multimeter to measure the pin
values for the requirements specified in 3.4.1.
4.5.2.5 Circuit board assembly test procedure.
a. Disconnect generator and Multimeter. Connect
V input
oscilloscope common lead to Pin K and vertical input to Y.
2 v/cm and Time 1 millisec/cm, positive trigger.
b. Activate S3 switch momentarily. Pin E should read 13
1 volts the first 6 to 10 seconds and after that should read less
than 1 volt. Scope reading should be 8 1 volt peak decaying to 0
volts over 6 milliseconds.
(Figure 4). Turn off oscilloscope.
Press
c. Recheck Pin U. It should read less than 1 volt.
S2 switch momentarily. Pin U should read 13 1 volt.
d. Connect generator to Pin Z and voltmeter to Pin E.
Readjust signal generator to 1200 HZ. Press S3 momentarily. Pin E
should read 13 1 volt and Pin U less than 1 volt.
Pin U should read 13 1 volts.
Press S2.
e.
f. Set S1 switch to EXT. Readjust signal generator to 1450
HZ.
Use a multimeter to measure the requirements specified in 3.4.2.
82
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals