Fluke 5790A, Operator'S Manual

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5790A
Operators Manual
2-4
LC-1 LC-2 LC-3 LC-4
LC-5 LC-6 LC-7
add2f.eps
Figure 2-1. Line Power Cord Types Available from Fluke
2-3. Environmental and Input Requirements
You must operate the 5790A in an ambient temperature /-5 °C of the temperature
of the last calibration for full accuracy. At any time during operation, press the [SPEC]
key to display the temperature of calibration, the absolute uncertainty for the present
input, and the number of days since the last calibration. To operate the 5790A outside the
specified temperature range, refer to the Specifications in Section 1 for information about
temperature constants.
Inputs are protected from overloads on all ranges, but sources connected to the 5790A
must be current-limited to 200 mA or less, be below 1000 V dc or rms ac, and be free of
high-energy transients. Refer to Section 2 of the Service Manual for more information
about protection circuitry.
2-4. Cooling Considerations
 Caution
Damage caused by overheating may occur if the area around
the air intake or exhaust exit is restricted, the intake air is too
warm, or the air filter becomes clogged.
A hidden but important feature of the 5790A is its internal cooling system. Baffles direct
cooling air from the fans throughout the chassis to internally dissipate heat during
operation. The accuracy and dependability of all internal parts of the 5790A are enhanced
by maintaining the coolest possible internal temperature. By observing the following
rules, you can lengthen the life of the 5790A and enhance its performance:
•
The area around the air filter must be at least 3 inches from nearby walls or rack
enclosures.
•
The exhaust perforations on the sides of the 5790A must be clear of obstructions.