INTRODUCTION
The RS-500 Resistance Substitution Box is a convenient
instrument for determining the desired resistance values in circuits
under design or test. The resistance obtainable is from 0Wto
11,111,110Win 1 ohm steps. All resistors are precision 1%
resistors.
OPERATION
All of the resistors are wired in series. A switch on the front panel
shorts each resistor. Putting the switch in the ON (up) position
removes the short and places the resistor across the output
terminals. The two green binding posts serve as the output
terminals. To place any resistance across the output terminals turn
ON those switches that add up to the desired resistance.
For example, for 5,071W, turn on the 3kW, 2kW, 40W, 30Wand 1W
switches.
PARTS LIST
RESISTORS
Qty Description Part # Qty Description Part #
111033 1 3kW1% 1W 143032
112033 1 4kW1% 1W 144032
113033 1 10kW1% 1W 151032
114033 1 20kW1% 1W 152032
121033 1 30kW1% 1W 153032
122033 1 40kW1% 1W 154032
123033 1 100kW1% 1/2W 161031
1 1W 1% 1W
1 2W 1% 1W
1 3W 1% 1W
1 4W 1% 1W
1 10W 1% 1W
1 20W 1% 1W
1 30W 1% 1W
1 40W 1% 1W 124033 1 200kW1% 1/2W 162031
1 100W1% 1W 131032 1 300kW1% 1/2W 163031
1 200W1% 1W 132032 1 400kW1% 1/2W 164031
1 300W1% 1W 133032 1 1 W 1% 1/2W
171031
134032 1 2 W 1% 1/2W
172031
141032 1 3 W 1% 1/2W
173031
1 400W 1% 1W
1 1kW 1% 1W
1 2kW 1% 1W
142032 1 4 W 1% 1/2W
174031
MISCELLANEOUS
Qty Description Part #
1 PC Board 517011
28 Switch Slide DPDT 541023
1 Front Panel 614404
1 Case 623004
2 Lockwasher, Binding Post 625031LW
2 Nut, Binding Post 625031HN
2 Binding Post Green 625033
4 Screw 2mm x 17mm Philips 641103
4 Lockwasher #4 External 646405
4 Rubber Feet 662023
TWO YEAR WARRANTY
All Elenco models are guaranteed for two full years
on all parts and service. For the first 3 months,
your power supply is covered at absolutely no
charge. For the remaining 21 months, a nominal
service charge is required to cover shipping and
handling.
When returning merchandise for repair, please
include proof of purchase, a brief letter of
explanation of problem, and sufficient packing
material. Before returning any merchandise please
call our service department at (847) 541-3800 to
obtain a return authorization number (R A).
Service Department
