Product Overview
Benchtop Potentiometer with Six-Dial Volts Readout, Standard Cell Controls and Front EMF A and EMF B Terminals
Condition
Used, clean and in good shape on a cursory inspection, and the buttons and knobs operate smoothly. Function testing not performed, and full calibration has not been checked. Sold as one instrument with no manuals, test leads or accessories, and the cable at the front panel ends in bare wire leads with no plug. Markings legible: LEEDS & NORTHRUP, PHILADELPHIA, PA., MADE IN U.S.A., CATALOG NO. 7556, GUARDED POTENTIOMETER, 1735163, and on the rear + MAX 2.16V DC - POWER SUPPLY.
Ships same or next business day from our Idaho warehouse. Selling online since 1999.
Product Overview
A Leeds & Northrup guarded potentiometer with a PHILADELPHIA, PA. badge, and every control and terminal on it carries a printed name. The front pairs a six-dial VOLTS readout with STANDARD CELL and CURRENT adjustments, and the rear carries the detector, standard cell and power supply terminals.
Key Features
- VOLTS readout of six dials, each set by its own knob
- STANDARD CELL adjustments marked ZERO, COARSE and FINE
- CURRENT knobs marked COARSE-MEDIUM and FINE, with an INCREASE arrow
- DETECTOR keys marked EMF A, SENSITIVITY, NORMAL and REVERSE
- MEASURE selector marked X.01, X1, STD and STD CELL CHECK
- Front compartment with five binding posts under + EMF A -, GUARD and + EMF B - labels
- Rear terminals marked + STD CELL -, GUARD, 1 DETECTOR 2, DETECTOR, + MAX 2.16V DC - POWER SUPPLY and GRD
- Carry handle on each side of the front panel
Applications
- Restoring a 7556 for a calibration bench, with calibration done after purchase
- Teaching potentiometric voltage measurement against a standard cell in an electrical lab
- Harvesting knobs, dials and binding posts for another 7556 under repair
Frequently Asked Questions
Are test leads or a manual included?
Not included. No manuals, test leads or accessories come with it.
What does the rear POWER SUPPLY terminal pair take?
DC of no more than 2.16V, positive on the + post: + MAX 2.16V DC - POWER SUPPLY.
Has this potentiometer been calibrated?
No. The buttons and knobs operate smoothly, but function testing was not performed and full calibration has not been checked. You get a clean instrument with smooth controls, and you take on calibration and the bare-lead cable at the front panel. Flat-rate shipping in the lower 48, and orders over the free-shipping line ship free.
The rear supply posts take no more than 2.16V DC. Read that limit before anything gets wired to it.
