$123.0 Buy It Now or Best Offer
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Seller Store fiddleback1
(531) 100.0%,
Location: Paradise Valley, Arizona
Ships to: US,
Item: 267051679144
All returns accepted:ReturnsNotAccepted
ESI – Electro Scientific Industries:ESI – Electro Scientific Industries
MPN:DP 211
Country/Region of Manufacture:United States
Measurement Range:1:10000 ppm
For sale is an ESI DEKAPOT 10K ohm Model DP 211, S/N 56554. This unit has been tested and characterized; it is fully functional. It uses heavy duty solder lugs for input and output. A 25” 16 gauge cable, terminated by a standard ¾” dual banana plug, is securely soldered to the unit. Its classic black hammertone finish is in excellent condition. DEKAPOT Potentiometers are coaxial-dial Kelvin-Varley voltage dividers. This model has two decade dials and an interpolating potentiometer with 100 minor divisions. Input resistance is nominally 10K ohms. This unit can divide either DC or AC voltage. The attached engineering bulletin shows the typical performance (vs frequency) for AC operation. The unit is rated for a maximum power dissipation of 5 watts. An attached table shows the measured linearity of each decade on this particular unit. The worst-case linearity (155 ppm) amounts to about 1.5 minor dial divisions. The photo with the DVM reading was made with a reference 10V input. Construction characteristics include:Each decade is constructed of precision ESI wire-wound resistors, wound on a mica form, and featuring very low temperature drift coefficients. With a 10 Volt (1 ma) input, no temperature drift was apparent.The ceramic switch decks use dual opposing switch contacts made of solid silver alloy for long life and low contact resistance. The voltage output for a given switch setting is extremely repeatable (assuming a stable voltage source).The ESI interpolating potentiometer is very finely wound, and provides roughly 4.5 windings per minor division. This provides an adjustability limit (resolution) of about 22 ppm.Internal conductors connecting resistors to switches are 18 gauge solid copper. Note that Kelvin-Varley devices are not calibrated resistors.They are voltage dividers. They have an equivalent circuit which includes a variable resistor in series with the output lead, which makes it difficult to find its linearity by resistance measurements. Linearity should be assessed by using it as a voltage divider. Included with this item are: ESI DEKAPOT 10K ohm Model DP 21118 gauge input cable, terminated by dual banana plugCharacterization data sheetESI Engineering Bulletin #3, which characterizes AC performance Questions are welcome.
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