Rear Panel; Figure 3-2 Model 3321 Rear Panel - Keithley 3321 Operator's Manual

SECTION 3
Operation
WARNING -/%
NO INTERNAL OPERATOR
Figure 3-2. Model 3321 Rear Panel
CAUTION
FOR FIRE PROTECTION,
SERVICEABLE PARTS. SERVICE
3.2.2 Rear Panel
CAUTION
0 to *35V is the maximum voltage that can be
GLIB - This connector is used to connect the GPIB
applied to the BIAS IN connector. Voltages out-
interface of the instrument to GPIB interface of a com-
side this range may blow the fuse and cause
puter. See Section 4 for details.
damage to the instrument.
BIAS -The following switch, fuse and input connector
pertain to using an external bias supply:
INT/EXT
Switch - This toggle switch is used to
switch between the built-in (INT) bias power sup-
ply (2V) and the externally (EXT) applied bias sup-
ply (up to 35V).
Fuse - Maintenance fuse for the external power
supply (O.lA quick acting type).
IN Connector - BNC connector used to connect the
external bias supply to the instrument power input con-
nector. Use a 0 to +35V supply with low ripple and
noise.
Ventilation Fan - The fan is used to keep the inside of
the instrument free from damaging heat build-up. The
fan pulls cool air into the instrument and expels warm
air out of the vents in the top cover. For proper
ventilation:
1. Maintain at least 10cm between the rear panel and a
wall.
2. Do not block the air vents in the top cover.
3. Clean the air filter periodically to prevent clogging.
Figure 3-3 shows how to remove the filter for
cleaning.
WARNING
Be sure to turn off the power and remove the
power cord before removing or installing the
filter.
3-6