Meter Setpoints and Hysteresis

Many digital meters provide relay outputs to activate external alarms or controls. Two parameters, setpoint and hysteresis, are used to configure these outputs. The setpoint is a predetermined level, within the range of the meter, where a protective or control action is initiated. (more...)


Common Mistakes When Using a DMM

The digital multimeter is one of the most widely used test instruments. A handheld DMM typically has 3½ or 4½ digit resolution and at least 3, but sometimes more than 10 functions (DCV, ACV, Ω, DCA, ACA, Hz, duty cycle, capacitance, continuity, diode test, etc). Newer meters include many features to increase safety, (more...)

Meter Relays

What is a Meter Relay?

A meter relay is a meter with a switched output that can be used to control a process or activate an alarm. In its simplest form, an analog meter relay uses mechanical contacts or a microswitch to operate an external device when the analog meter pointer reaches the level of the set pointer. (more...)

Panel Meter Collage

80 Years of Panel Meter Evolution

When Weschler started in 1941, panel meters were hand-made analog instruments. The typical meter had either a metal or bakelite case, a glass lens and an electro-mechanical movement. There were many US manufacturers during the 1940s and 1950s, including Triplett, Simpson, Weston, GE, Westinghouse, Beede, Hoyt, Hickok, Jewell, Marion, Supreme, (more...)

Vintage Measurement Equipment

80 Years of Instrumentation Innovation

This year Weschler Instruments celebrates its 80th year as a supplier of meters and instrumentation. Much has changed in electronic measurement equipment and technology since 1941. Vacuum tubes were replaced by transistors and then integrated circuits. Analog indicators became digital readouts and then graphical touchscreens. Manual operation migrated to automatic sequencing and then fully computerized tests. (more...)