Clarostat Mfg. Co. Inc. Power Resistor Decade 240-C Другой
Power Resistor Decade 240-C
Power Resistor Decade
A must in electronic and electrical work.. . when dealing
with known or unknown resistances ... selected or determined
under active operational conditions. Now available in “box”
or rack-mounted versions.
The Power Resistor Decades provide a power resistor of any
required ohmage from 1 to 999,999 ohms in Í ohm increments.
The ohmage is selected or determined by six front panel
dials, and the value is read directly—in sequence—from the
dials, thereby simplifying the selection of known or unknown
resistances for use in working circuits.
There is no instrument available comparable to Clarostat
Power Resistor Decades. They are exclusive Clarostat
developments and products. For years the bench version,
Model 240-C, has been standard equipment in laboratories,
engineering departments, plants, for maintenance and service
personnel, schools and other users requiring accurate
resistance determinations under load conditions. Now, it is
available as a rack mounted unit, Model 250, for the
convenience of those desiring a more permanent installation.
Power Resistor Decades are used whenever accurate steps of
resistance values between 1 and 999,999 ohms are required
—either predetermined or by “closing in”. Such a capability
is often required in such applications as:
Calibrations Testing procedures Bridge circuits
Experimental work of all types Instead of lengthy
mathematical calculations often followed by
“experimentation” for best results, the Power Resistor
Decades permit the trying out of a wide range of resistance
values until the best performance is obtained—then the
reading is taken directly off the dials.
If the desired resistance value is already known, and a
resistor of that value is required for given circuit or
operating conditions, it is immediately obtainable by simply
dialing to that ohmage.
—No need to stock a large amount of power resistors.
—No need to order various resistors and wait for delivery.
—No need to crank out cumbersome formulas.
—Power Resistor decades provide a permanent source of
resistors in exactly the right value.
THe Power Resistor Decades are identically operated. Each
consists of six resistance decades. Each decade is marked
(e.g. X-l, X-10, X-100, etc.) to indicate its contributory
ohmage. Thus, the extreme right-hand dial, X-l, supplies
from 1 to 9 ohms, the next dial adds to 10 to 90 ohms, the
next dial 100 to 900 ohms, and so on. Each dial is numbered
from 1 to 9, so that to obtain total ohmages the readings
are read directly from left to right—obtaining such readings
as 278, 304 ohms or any value up to 999,999.
For Known Resistances
Set the dial knobs to the desired resistance value. For ex-
9 Provides any ohmage value, in l*ohm increments, from ? to
« Determines known or unknown resistance vaiees by simply
• Available in bench or rack mounting versions
• Power ratings to 22$ watts max at 1000 volts max
• Six decades for quick setting and direct
• Used in actual circuits and under "live" conditions
• Two sets of terminals taking banana*plug, spade~iug or
plain wire connections
• Adequate ventilation with grill and louvers
ample: 561,231 ohms, set the dial farthest to the left to 5,
the next one to 6, the next to 1—and so on.
For Unknown Resistances
To select an unknown resistance—such as for a load
resistance in a power supply, set all dials to 9 then
connect your leads (Caution: do not exceed 1000 volts across
terminals or the current rating of each decade—see current
rating section.) You now have 999,999 ohms in the circuit.
With suitable meters connected in the circuit, you can
reduce the resistance until the desired voltage and current
are obtained. All switches are of the shorting type to
maintain resistance in the circuit when switching.
The instrument is supplied with a pair of terminals on each
side. The top terminal of each pair is common, and so is the
bottom terminal of each pair—so that connections can be made
at either end of the instrument. Binding posts accommodate
wire-lead, spade-lug or banana-plug connections. Model 250
has two sets of identical terminals, current and resistance
terminals provide front and rear hookup.
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28 December 2016