Locating the system
Locate the 4200A-SCS so that it will operate within the following ambient temperature and
humidity limits:
• Temperature: +10 °C to +40 °C
• Relative humidity: 5% to 80%, noncondensing
SMU and preamplifier accuracy specifications are based on operation at 23 °C ±5 °C and between
5% and 60% relative humidity. See the 4200A-SCS datasheet at the Keithley Instruments website
(tek.com/keithley) for derating factors outside these ranges.
To avoid overheating, operate the instrument only in an area with proper ventilation. Allow at
least eight inches of clearance at the back of the mainframe to assure sufficient airflow and
comply with the following guidelines:
▪ Operate the instrument in a clean, dust-free environment.
▪ Keep the fan vents and cooling vents from becoming blocked (sides and rear of the
instrument).
▪ Do not position any devices adjacent to the instrument that force air (heated or unheated)
into cooling vents. This additional airflow could compromise accuracy performance.
▪ When rack mounting the instrument, ensure adequate airflow around the sides, bottom,
and back.
▪ Do not rack mount high-power dissipation equipment adjacent to the 4200A-SCS.
▪ To ensure proper cooling in rack environments with only convection cooling, place the
hottest equipment (for example, power supply) at the top of the rack. Place precision
equipment, such as the 4200A-SCS, as low as possible in the rack, where temperatures
are the coolest. Adding spacer panels below the instrument helps to ensure adequate
airflow.
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