Installation; Introduction; Performance Checks; Power Requirements - Keithley 776 Instruction Manual

Installation
2-1. Introduction
This section contain information and instructions nec-
essary for the installation and shipping of the Model
776. Details are providedforpowerconnection. ground-
ing safety requirements. installation information. and
x-packing instructions for storage or shipment.
2-2. Performance Checks
The instrument was carefully inspected for mechanical
and electrical performance before shipment from the
factory. It should be free of physical defects and in
perfect electrical order upon receipt. Check the instru-
ment for damage in transit and perform the electrical
procedures outlined in Section 5. If there is indication
of damage or deficiency. see the warranty in this manual
and notify your local Keithley field engineering rep-
resentative or the factory
CAUTION
It is recommended that the operator
be fully familiar with the specifica-
tions and all sections of this manual.
Failure to do so may compromise the
warranty and the accuracy which
Keithley has engineered into your in-
strument.
2-3. Power Requirements
The instrument may be operated from any one of the
following sources: a. 103.5 to 126.5 Volts (1 IS Volts
nominal) b. 207 to 253 Volts (230 Volts nominal).
The instrument operates over the power mains frc-
quency range of 18 to 63 Hr. Always verify that the
operating power mains voltage is the same as that speci-
fied on the rear panel voltage selector switch.
CAUTION
Failure to switch the instrument to
match the operating line voltage will
damage the instrument and may void
the warranty.
The instrument should be operated
from a power source with its neutral
at or near ground (earth potential).
The instrument is not intended for
operation from two phases of a
multi-phase ac sqstcm or across the
legs of a single-phase. three-wire ac
power system. Crest factor (ratio of
peak voltage to rms) should be typi-
cally within the range of 1.3 to I.6
at 10% of the nominal rms mains
voltage.
24. Grounding Requirements
To insure the safety of operating personnel. the U.S.
O.S.H.A. (Occupational Safety and Health) rcquire-
ment and good engineering practice mandate that the
instrument panel and enclosure be "earth" grounded.
All Keithley instruments are provided with an Uuder-
writers Laboratories (U.L. and V.D.E) listed lhrec-con-
ductor power cable. which when plugged into an ap-
propriate power rcceptaclc. grounds the instrument.
2-l