A TV monitor includes an antenna coupler capable of selectively coupling the TV receiver being monitored to an antenna or an r.f. oscillator. The oscillator is selectively operated to impose an r.f. signal onto the antenna input of the receiver between successive horizontal blanking periods on an active video line. One probe, connected to the horizontal retrace circuit of the receiver monitors the receiver for an "on " or "off" condition, while another probe, connected to the kinescope circuits ...

A monitor for checking a plurality of multi-bit digital patterns generated by a system being monitored to determine that each pattern is valid, that each of the patterns appear in the right sequence and that the total number of valid patterns detected during the testing cycle is as expected is disclosed. Additionally, the bit patterns are monitored to detect unexpected transitions. The results of these tests are then combined to form a composite malfunction signal indicative of the operational s...

Electrical power lines connected to loads are monitored by a protective circuit assembly to suppress peak transient voltages and surges by use of a Zener clamping device. Impedance branches connected in parallel with the Zener device share the transient loads when Zener break-down occurs under abnormal conditions. Each impedance branch includes a non-linear resistor arranged to clip voltages at different levels, at least one of the branches having a fixed resistor connected in series with the no...

A TV monitor includes an antenna coupler capable of selectively coupling the TV receiver being monitored to an antenna or an r.f. oscillator. The oscillator is selectively operated to impose an r.f. signal onto the antenna input of the receiver between successive horizontal blanking periods on an active video line. One probe, connected to the horizontal retrace circuit of the receiver monitors the receiver for an "on" or "off" condition. A second probe, connected to the kinescope circuits of the...

A load cell for use in load measuring systems. The load cell is comprised of chain links to be secured to a load. A sensor is associated with at least one link of the chain. The sensor is able to measure a load applied to the link.

Reliability problems in a torque monitor are reduced in a simplified construction including a housing (30) journalling first and second coaxial shafts (34), (42). The second shaft (42) is mounted for axial movement within the housing (30), and a sleeve (58) has a threaded connection (56), (60) to the second shaft (42), and a spline connection (36), (62) to the first shaft (34). A switch (82), (84), is mounted in the housing (30) and a switch actuator (80) is mounted for movement towards and away...

A monitor for monitoring motion wherein a light source is positioned a distance from a light conductor and the distance between the light source and the light conductor is varied in response to motion. The light received by the light conductor is used to provide output indications indicative of the monitored motion.

An apparatus and method for reliably generating simulations of actual dust suspension conditions and measuring the associated density of suspended dust. The dust monitor is constructed to permit generation of dust suspensions by achieving various pre-selected motions for the test material, such as a rolling motion or swirling motion relative to the forward direction of travel of the test material. The apparatus and method permit prediction and control of the propensity to form dust suspensions d...

A current monitor is provided for indicating the presence of the short duration current pulses necessary to detonate ordnance devices and simultaneously interrupt the ordnance firing circuit to simulate firing conditions. The current monitor consists of a reed switch magnetically linked to the firing circuit by a low resistance coil in series with the firing circuit. The normally opened reed switch is connected in series with the monitor power source and the control gate of a silicon controlled ...

An apparatus for indicating to an operator the rotational rate of an element that is located remotely from the operator. A multicolored reflector is secured to the rotating element and a beam of light reflected off said multicolored reflector is transmitted through a fiber optic cable to the operator's station. The operator can by observing the beam of light emitted from the fiber optic cable ascertain the rotational rate of the element.