Agilent Technologies 6613C - Manual (Page 36)

3 - Troubleshooting
36
Manual Fan Speed Control
Under some circumstances such as testing acoustical devices where the fan noise would interfere with the
test, it would be advantageous to reduce the fan speed. If the test requires a very light load, the ambient
temperature is low and the duration of the test is short, the fan speed may be temporarily reduced. The turn-
on default is "Automatic" so this procedure must be performed, as needed, every time the line voltage is
turned on. To manually control the fan speed:
a. Simultaneously depress the "0" and "1" keys. EEINIT will be displayed.
b. Using the Up/Down annunciator keys select FAN:MODE.
c. Using the Up/Down arrows select FAN:MODE
d. Press "Enter"
e. Simultaneously depress the "0" and "1" keys. EEINIT will be displayed.
f. Using the Up/Down annunciator keys select FAN:SPEED
g. Press "Enter Number".
h. Enter the desired speed (numeric entry range is 0 to 100%)
i. Press "Enter"
Disabling Protection Features
The power supply's protection features may be disabled. This is not recommended as a normal operating
condition but is helpful under some circumstances such as troubleshooting. The turn-on default is "NO-
PROTECT OFF" (protection enabled) so this procedure must be performed, as needed, every time the line
voltage is turned on. The overvoltage protection function is not disabled by this procedure. To disable the
protection:
a. Simultaneously depress the "0" and "1" keys. EEINIT will be displayed.
b. Using the Up/Down annunciator keys select NO-PROTECT .
c. Using the Up/Down arrows select NO-PROTECT .
d. Press "Enter"