New products

Rectilinear Recording Milliammeter. The first rectilinear recording milliammeter has been announced by Texas Instruments Inc. (TI). All the advantages of rectilinear recording, with signals presented in their true rectilinear appearance, removing the necessity of complicated data reduction, are combined in this ruggedized, ink-writing, galvanometer-actuated instrument, with front access for all routine operations. Included are front-located signal terminals (rear terminals optional), front-located switches and controls, writing area on chart for notations, disappearing sliding door, front-located zero adjust, front-filling inking system, swinging chart paper carriage, accessibility to perform all routine maintenance and adjustment procedures without removing case or disassembling, and fingertip “gear-shift” for changing chart speeds. The rectilinear recording milliammeter weighs less than 27 pounds and occupies less than 3/4 cubic feet. Electrical characteristics are as follows: 1 milliampere for full-scale deflection, 4½ inches active chart width, 1,500 ohms input resistance, and undamped natural frequency of 2 cycles per second. Structurally, the TI recorder consists of interchangeable unit subassemblies mounted on a basic frame which simplifies addition of accessories, modification, or maintenance. The 100-foot chart roll can be run at a choice of 10 speeds, in inches per minute or inches per hour, making possible continuous recordings ranging from 1 hour and 40 minutes to 60 days. Six inches of chart length are always visible, representing as little as 30 seconds or as much as 8 hours, depending on chart speed. The paper feed mechanism has an automatic chart takeup in case the operator wishes to examine more than the normal 6 inches while the instrument is recording. Two event marker pens are available and indirect lighting of the chart is provided for convenience in night recording. TI rectilinear recording milliammeters can be operated- from a-c, d-c, or spring-drive. Adapters are built in for external drive.