Fluke NetDAQ 2640A, Service Manual

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General Maintenance
Introduction
3
3-3
Introduction 3-1.
This chapter provides handling, cleaning, fuse replacement, disassembly, and assembly
instructions. For replacement part information, refer to Chapter 6.
Warranty Repairs and Shipping 3-2.
If your instrument is under warranty, see the warranty information at the front of the
Users Manual for instructions on returning the unit. The list of authorized service
facilities is included in Appendix I of the Users Manual.
General Maintenance 3-3.
General maintenance includes information on the general aspects of instrument
servicing, including required test equipment, power requirements, static-safe handling,
and servicing surface-mount assemblies.
Required Equipment 3-4.
Equipment required for calibration, troubleshooting, and repair of the instrument is listed
in Chapter 4, Table 4-1. Refer to the Fluke "Surface-Mount Device Soldering Kit" for a
list of special tools required to perform circuit assembly repair. (In the USA, call
1-800-526-4731 to order this kit.)
Power Requirements 3-5.
WARNING
To avoid shock hazard, connect the instrument power
cord to a power receptacle with earth ground.
The instrument operates on any line voltage between 107V ac and 264V ac and at any
frequency between 45 and 65 Hz. However, the instrument is warranted to meet
published specifications only at 50/60 Hz. The instrument also operates from dc power
(9 to 16V dc). DC input power is connected to the rear input connector
ALARM/TRIGGER I/O (J6), pin 8 (DCH), and pin 7 (DCL). If both ac and dc power
sources are connected to the instrument, the ac power source is used if the ac line voltage
exceeds approximately 8.3 times the dc voltage. Automatic switchover between ac and
dc occurs without interrupting instrument operation. The instrument draws a maximum
of 15 VA on ac line power or 6W on dc power.
Static-Safe Handling 3-6.
All integrated circuits, including surface mounted ICs, are susceptible to damage from
electrostatic discharge (ESD). Modern integrated circuit assemblies are more susceptible
to damage from ESD than ever before. Integrated circuits today can be built with circuit
lines less than one micron thick, allowing more than a million transistors on a 1/4-inch
square chip. These submicron structures are sensitive to static voltages under 100 volts.
This much voltage can be generated on a dry day by simply moving your arm. A person
can develop a charge of 2,000 volts by walking across a vinyl tile floor, and polyester
clothing can easily generate 5,000 to 15,000 volts during movement against the wearer.
These low voltage static problems are often undetected because a static charge must be
in the 30,000 to 40,000 volt range before a person feels a shock.