General Operation; Safety Hazards - Keithley 3761 User Manual

In this section:

General operation .................................................................... 3-1

General operation
This section provides information needed to use the 3761 Model 3706A system switch mainframe.
Once the card is installed in the mainframe, refer to the Series 3700A System Switch/Multimeter
Reference Manual for complete operating instructions.

Safety hazards

To prevent electrical shock that could cause injury or death, never make or break
connections while the equipment is powered on. User supplied lethal voltages may be
present on the PC board or the connections. Turn off the equipment from the front panel,
disconnect the main power cord, and discharge stored energy in external circuitry before
making or breaking cable connections. Putting the mainframe equipment into an output-off
state does not guarantee that the outputs are powered off if a hardware or software fault
occurs. Precautions must be taken to prevent a shock hazard by surrounding the test device
and any unprotected leads (wiring) with double insulation for 500 volts, Category I.
Follow these recommendations before and after applying power to the equipment:
1. Do not exceed the 3761 maximum allowable signal level as defined in the specifications.
2. Do not exceed the 3761 maximum common mode voltage of 30 V as defined in the
specifications.
3. Make sure the system switch mainframe is grounded through an earth grounded receptacle
before operation.
4. Turn off all power supplies and discharge any residual energy before installing or removing the
3761 from the system switch mainframe or changing the 3761 SMA connections.
5. Inspect all cables for wear and defects such as cracks and exposed wires. Make sure that you
correct any defects found before operating the instrument.
6. Use only low noise coaxial cables.
7. Ensure that the mounting screws for the card are securely connected to the system switch
mainframe chassis in order to provide the proper chassis protective grounding.
8. Read this manual carefully and adhere to all of the safety precautions listed before operating the
instrument.
Section 3
General operation