Model 6220/6221 User’s Manual Getting Started 1-9
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4 DIGITAL I/O
Male DB-9 connector. Four pins for digital output, one pin for Start of Test (SOT) trigger,
and one for external voltage (VEXT) input.
5 RS-232
Female DB-9 connector:
• For RS-232 operation, use a straight-through (not null modem) DB-9 shielded cable
for connection to the PC.
• For Delta, Pulse Delta, and Differential Conductance, use the supplied serial cable
(CA-351) for connections between the Model 622x and the Model 2182/2182A
.
6 LO and GUARD
Banana safety jacks for output low and banana jack Guard.
7 TRIGGER LINK
Eight-pin micro-DIN connector for sending and receiving trigger pulses among connected
instruments. Use a trigger link cable (Model 8501) for connections.
8 INTERLOCK
Interlock connector – Provides two screw terminals for connection to an interlock switch.
When the interlock switch is closed, the OUTPUT of the 622x is enabled, allowing it to be
turned on. When the interlock switch is opened, the OUTPUT is disabled (OUTPUT can-
not be turned on and will turn off if it was on).
9 Power module
Contains the AC line receptacle and power line fuse. The instrument can operate on line
voltages of 100V to 240VAC at line frequencies of 50 or 60Hz.
Heat sink and cooling vents
The Model 622x uses a heat sink and three cooling vents to dissipate heat. The
right side of the case is cut out to expose the black, finned heat sink. Cooling
vents are provided on both sides of the case and on the top cover.
The heat sink could get hot enough to cause burns. Even if the instrument is
turned off, you should assume that the heat sink is still hot as it takes considerable
time for it to cool off.
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