Service manual

WARNING USING AUTOTRANSFORMERS. If the mainframe is to be
energized via an autotransformer (for voltage reduction) make
sure the common terminal is connected to neutral (that is, the
grounded side of the main’s supply).
CAPACITOR VOLTAGES. Capacitors inside the mainframe may
remain charged even when the mainframe has been
disconnected from its source of supply.
USE PROPER FUSES. For continued protection against fire
hazard, replace the line fuses only with fuses of the same
current rating and type (such as normal blow, time delay, etc.).
Do not use repaired fuses or short-circuited fuseholders.
WIRING INSULATION. To prevent electrical shock, all wires to
the channel connections must be insulated to at least 120 V rms
(170 V peak).
CAUTIONS This section contains CAUTIONS which must be followed to avoid damage
to the equipment when performing instrument maintenance or repair.
CAUTION MAXIMUM VOLTAGE/CURRENT. The maximum voltage that
may be applied between High (H), Low (L), and Guard (G)
terminals is 170VDC or 120Vrms (170Vpeak) for the E1345A,
E1347A, E1355A, and E1356A modules. The maximum voltage
that may be applied between High (H), Low (L), and Guard (G)
terminals is 250VDC or ACrms (354Vpeak) for the E1343A or
E1344A. The maximum current is 50 mA (non-conductive) per
channel. The maximum power per channel is 1 VA.
STATIC ELECTRICITY. Static electricity is a major cause of
component failure. To prevent damage to the electrical
components in the multiplexers, observe anti-static techniques
whenever working on a multiplexer.
Chapter 1 General Information 13