Agilent Technologies 6680A Manual Do Utilizador

 J106-4

Primary/chassis ground

Connect meter or scope common here. Then
make measurements at test points 
through

.

 U101- 1

+ 5V primary bias

+ 5V + 0.2V

 U101-6

Goes high for approximately 40 ms at power on,
then goes low.

 U101-8

Held low for approximately 40 ms at power on,
then goes high.

 U110-3

Primary transmit to secondary serial data line.
Toggles between 0 and +5V.

 U111-6

Primary receive from secondary serial data line.
Toggles between 0 and +5V.

 U119-4

Primary receive from front panel serial data
line. Toggles between 0 and +5V.

 U119-18

Primary transmit to front panel serial data line.
Toggles between 0 and +5V.

Connect meter between TP 

and 

, or

and 

, or

and 

,  and measure approximately 220VAC or

440VAC. Measurements at test points 

Rthrough X.

J418-1/J417-7

AC Mains Voltage

J418-2/J417-8

AC Mains Voltage

J418-3/J417-9

AC Mains Voltage

K402 coil

24VDC Coil Voltage

Turns on PS, and after power-on initialization
test, reads approximately 24VDC.

J430-1 (+) to J430-2 (-)

Rail #1 Voltage

Measure approximately 290VDC

 J431-1 (+) to J431-2 (-)

Rail #2 Voltage

Measure approximately 290VDC

J801-4 to J801-5

GPIB 5V Bias

+15 

± 0.9V measure approx. 11VAC

J801-1 (+) to J801-2 (-)

Fan voltage

Measure 24VDC

 J827-1 (+) to J827-2 (-)

Inrush relay coil

Measure 24VDC

 J827-1 (+) to J827-3 (-)

Rail relay coil

Measure 24VDC after power-on initialization
test.

R331

24V Primary

Measure approximately 34VAC

R330

-15Vs secondary bias

-15 

± 0.9V

+C354

-25V

-22.5V to -27.5V

 U310-16

0V

 U308-6

0V

U308-7

+5V