Instrumentation glossary

M

MOV (Metal Oxide Varistor), is a very sensitive to the voltage non-linear resistor assembly. MOV's folder type device exhibited the applied voltage decreases the voltage will increase, they usually exhibit characteristics when the conduction current one mA (milliamp) dropped voltage and start crossing this device, this voltage level is conduction This decline voltage across the MOV when, there will be a large increase in the current device, in a short reaction must be included when determining the true level of protection for this device considerations.

MagneticFlux, all of the magnetic induction of the cross section has been provided through a magnetic field.

MagneticInteraction, unexpected results when the relays close to installed when the coil charging flux generated affect adjacent relay closing and opening values, in order to increase or decrease the closing and opening values, parameters offset of loss by the magnetic flux or the magnetic flux generated from the coil in the relay consider range. This problem may increase the pull-in voltage, this voltage is close to the coil of the accused voltage, or too much flux so that sue the voltage is removed the relay switch will not open. To calculate the closing and opening of voltage changes, increase the relay displays the percentage change of the standard voltage. For example, if a standard voltage 5V relay, the percentage change of the pull-in voltage is 14%, this pull-in voltage increases 0.7V (please refer to the relay Comment).

Magnetic Pole, the end of the magnet arrangement, magnetic flux coverage is the largest (N, S pole).

MagneticShield, a thin ferromagnetic metal surrounded relays to improve its magnetic field.

MagnetostrictiveForce, typically indicates that the force generated when the switch with the current and the coil charging magnetic drinking places on the coil magnetic field generated by the current flowing through the switching of the torque generated by the respective mutually influence occurs when this situation opens the switch is closed.

Mechanical Shock, Nonoperating mechanical impact of the relay or the sensor level (amplitude, the oscillation period and Discovering shape), relay or sensors within this level controlled and does not bring any permanent motor or mechanical damage.

Mechanical Shock, Operating mechanical shock when the operation of the relay or pass electrical level (the amplitude of the oscillation period and Discovering shape), in which the level of the relay or pass electrical controlled and will not bring any permanent motor or mechanical damage.

Miss, Contact, switch engagement pair fault, this fault when off exceed a certain maximum value at a specific time or the switch contact surface resistivity occurs.

N

Normally Closed (NC) Contacts (FormB), on behalf of the state of the switch, the switch is turned off when the magnetic field is applied before.

Normally Open (NO) Contacts (FormA), on behalf of the state of the switch, the switch is open when the magnetic field applied before.(Metal Oxide Varistor)

O

OHM'sLaw, the following chart exhibit electrical common swap

Operate Time or (contactoperate time or Pull-in time), to complete the operation (including switch start-up time) until the switch from electric to coil the total running time.

OperatingTemperature, reed switches, reed relays, reed sensors are able to successfully operating temperature range.

Output, is a part of the relay to perform the switching function the requirements.

Output Capacitance, crossed the capacitance of the switch.

Output OffsetVoltage, measure the loss of signal voltage circulation after the switch is closed, the unit of measurement usually are million copies of one of volts (mV). This voltage isolation amplifier and ground with the input voltage.

Overdrive, the amount of voltage or amps back the number of applications the 閞 off connection, the switch touch surface resistance usually measure 100% over-driven.

P

Permeability, the magnetic properties of the substance, described this is not easily go to conduction of magnetic flux.

PickupValue, when the switch has just closed, measured in current or voltage on the relay.

Pickup Pulse, is a very short and very high levels of vibration applied to a relay, resulting in the fastest time of the operation.

Pole, Double, an applied is connected to the switch and a switch arranged to indicate the two separate, i.e. two unipolar switch combination in together.

Pole, Single, one applied to a switching arrangement connected to the directions of all the switches arranged in one position or other normal.

Pressure, Contact, switch each unit area above efforts.
R

Rating, Contact, particularly rated the maximum rating of the switch to allow the voltage and allow the current.

Reed Relay, the original magnetic reed relay inside the glass tube.

Reed Switch or ReedSensor, the original magnetic reed switch inside the glass tube or relay acts as a dry contact.

Relay, Antenna, converting a particularly for conversion of the antenna circuit relay.

Relay, Close Differential, a relay specific signals lost value to its pull-in value.

Relay, Crystal Can, relay package in a closed place, was surrounded by quartz crystal frequency control type.

Relay, Current Sensing, relay operation in a predetermined current value.

Release Time or DropoutTime, the closed switch away, from the initial energy to open for the first time between time.

Reluctance, the resistance of the magnetic circuit to the magnetic force by the magnetic flux lines.

Reset, switch back to the original state (original position).

Resonant Frequency, to go to a certain frequency, the resonance switch tendency to develop to their size and composition.

Retentivity, the magnetizing force is removed to maintain the capacity of the magnetic.

S

Saturation, magnetization increase in the magnetic material, and sometimes no further increase in the magnetic flux.

Sensitivity, pull the reference magnetic Yin switch value, the unit is usually AT.

Shield, Electrostatic, one connected to the ground conductor, is located in two or more of the insulator to the electrostatic coupling between minimized.

Slew Rate, which is the rate of change of an output voltage and a very substantial step function is applied to the input voltage.

Small SignalBandwidth, this is a frequency range by a DC motor to go to a frequency in this frequency the signal strength is lower than its own signal of 3dB.

T

ThermalOffset, measure the loss of signal voltage circulation after the switch is closed, the unit of measurement usually are million copies of one of volts (mV).

Thermal ShockNonoperating, brought to the impact brought about by the temperature go up a set of relays, switches or sensors develop their stability.

Turn Off or DropoutTime, no power supply from the beginning to the time between when the switch from off to open.

Turn On or (contact operate time or Pull-in time), the total time to run electricity to the coil until the switch to complete the operation (including switch start-up time).

V

Varistor, the reference MOV annotation.(Metal Oxide Varistor)

Vibration, Nonoperating, go to an oscillation level and a certain frequency range, the relay can be controlled but did not bring about any permanent motor or mechanical damage.

Voltage, Nominal, expected on the voltage applied to the coil or voltage input.

Voltage, Peak AC, alternating current signal or power maximum positive voltage or minimum negative voltage.

VOLTAGE, Peak to PeakAC, the AC signal, or power supply, the maximum positive voltage to the lowest voltage value of the negative voltage, in the absence of any DC offset, the Vp-p = 2Vp.

Voltage, RMS is the root mean square of the positive and negative voltage in alternating current signal or power.

W

The Winding, continuation of the insulated wire coil axis cruising.

Winding, Bifilar, on behalf of two wound coils of line side by side against the match with every lap.

Wipe, Contact, when the switch to open the timely glide between two switches to match surface.(Metal Oxide Varistor)