Agilent Technologies 66111A, User Manual

Page: 46 / 190

4 - Turn-On Checkout
46
Procedure Display Explanation
7. Plug the output connector
back into the unit. Restores the output sense connections. The Prot
annunciator is still on.
8. Press
Shift, Prot Clear
NO FAULT Clears the protection condition. Prot is off; CV is on.
9. Press
Voltage
VOLT 0.000 Display shows the output voltage setting of the unit.
10. Press
Enter Number,
<15>, Enter
VOLT <15>
15.003V 0.0001A
Programs the main output to 15 volts. After the value
is entered, the display returns to Meter mode.
Because the output is enabled, the meter will indicate
the actual output voltage.
11.
Press
Shift, OV PROT:LEV 22.00 Display shows the overvoltage protection trip voltage
of the unit.
12.
Press
Enter Number,
<8>, Enter
PROT:LEV <8>
0.000V 0.0001A
Programs the OVP to 8 volts, which is less than the
previously set output voltage.
Because the OVP voltage entered was less than the
output voltage, the OVP circuit tripped. The output
dropped to zero, CV turned off, and Prot turned on.
13.
Press
Shift, OV,
Enter Number,
<22>, Enter
PROT:LEV <22> Programs the OVP to a value greater than the output
voltage setting of the unit. This prevents the OV
circuit from tripping again when the protection
condition is cleared.
14. Press Shift, Prot Clear 15.003V 0.0001A Clears the protection condition, thus restoring the
output of the unit. Prot turns off and CV turns on.
15.
Press
Output On/Off 0.000V 0.0000A Turn the output off.
16. Connect a jumper wire
across the + and - output
terminals. Shorts the output of the unit.
17.
Press
Output On/Off
.
0.004V 3.0712A
The CC annunciator is on, indicating that the unit is
in constant current mode. The unit is sourcing output
current at the maximum rating, which is the default
output current limit setting.
18.
Press
Current,
Enter Number,
<1>, Enter
.
CURR <1> Programs the output current to 1 ampere.
19. Press Shift, OCP 0.001V 0.0003A You enabled the overcurrent protection circuit. The
circuit then tripped because the unit was operating in
constant current mode. The CC annunciator turns off,
and the OCP and Prot annunciators turn on.
20. Press Shift, OCP 0.001V 0.0003A You have disabled the overcurrent protection circuit.
The OCP annunciator turns off.
21.
Press
Shift, Prot Clear 0.004V 0.998A
Restores the output. The Prot annunciator turns off.
The CC annunciator turns on.
22. Turn the unit off and remove
the shorting wire from the
output terminals. The next time the unit turns on it will be restored to
the *RST or factory default state.