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(ground). Failure to complete the ground system may allow
the chassis of this instrument to be elevated above ground
potential and pose a shock hazard.
Operating Temperature
The 434 requires very little air circulation for proper oper
ation . A thermal cutout in the instrument provides thermal
protection and disconnects the instrument power if the inter
nal temperature exceeds a safe operating level. Power is
automatically restored when the temperature returns to a
safe level.
The 434 can be operated where the ambient temperature
is between -15 ° C and + 55 ° C . The maximum operating
temperature must be derated 1 ° C for each 1000 feet of alti
tude above 5000 feet. This instrument can be stored in am
bient temperatures between -55 ° C and +75° C . After
storage at temperatures beyond the operating limits , allow
the chassis temperature to come within the operating limits
before power is applied .
2
NOTE
The crt performance may be degraded if a continuous
ly stored display is maintained for over four hours at
ambient temperatures below +40° C or for over one
hour at ambient temperatures greater than +40° C.
434
Operating Position
The handle of the 434 can be positioned for carrying or
as a tilt-stand for the instrument . To position the handle,
press in at both pivot points and turn the handle to the de
sired position . Fourteen positions are provided for conve
nient carrying or viewing . The instrument can also be set on
the rear feet for operation or storage.
CONTROLS AND CONNECTORS
General
The major controls and connectors for operation of the
434 are located on the front panel of the instrument. Several
auxiliary functions are provided on the rear panel . To make
full use of the capabilities of this instrument, the operator
should be familiar with the function and use of each of these
controls and connectors . A brief description of each control
and connector is given here . Some of the more important
instrument specifications are included here also.
434's with SN B191820 and above contain a front panel
FOCUS control located below the INTEGRATE button . Two
types of CRT graticules have been used in the 434, one has
the
% and 100% risetime references separated by 6 divi
sions, the other by 5 divisions . Illustrations in this manual
show the 5 division version .
REV AUG 1981
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