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Posts: 3,077. Re: HP 432A Power meter Testing. Normally they either work or they don't work at all. This is because the 432meter runs with a 478A thermistor sensor in a closed loop unlike modern thermocouple power meters. The modern thermocouple meters 'need' a 0dBm cal source that is typically run at 50MHz because they are open loop meters.
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A thermistor is a device that can be used to establish temperature measurements by correlating the measured value of its electrical resistance to the temperature of the environment or the specific part to which the thermistor has been mounted. The term "thermistor" is derived from the concatenation and contraction of two other words.
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At the set point, a temperature rise of a few degrees results in a large increase in resistance. The resistance is monitored by a thermistor protection relay (TPR) and, when the sharp change in resistance is detected by the thermistor protection relay (TPR), it operates a contact to initiate an alarm or to trip the protected device.. Thermistor protection relays are required to trip reliably.
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ABB's CM-MSx.xx range of thermistor motor protection relays monitor the winding temperature of motors. PTC sensors integrated in the motor windings directly measure the motor heat. This direct temperature measurement enables the thermistor motor protection relays to evaluate various motor conditions such as overheating, overload and insufficient cooling.
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A thermistor is a much more finessed device, as it operates on a sliding scale, not a simple on/off system. In essence, with a thermostat, the temperature is constantly fluctuating as the device tells the heat source to switch on and off, whereas with a thermistor, it can constantly feed information back to the device that controls temperature, so a much more stable temperature can be achieved.
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Most of my 5Kohm thermistors measure around 5100-5200 ohms at 25C, ie too high for an accurate temperature indication on a HP DMM. For the Ref oven, I will be using them over a very narrow temperature range of about 39-41C. If I shunt the thermistor with a high value resistor to indicate the correct temperature at 40C, this may work.
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Therefore the B value will define the thermistors material constant between the range of T 1 and T 2.That is B T1/T2 or B 25/100 with typical NTC thermistor B values given anywhere between about 3000 and about 5000.. Note however, that both the temperature points of T 1 and T 2 are calculated in the temperature units of Kelvin where 0 0 C = 273.15 Kelvin. Thus a value of 25 o C is equal to 25.
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Thermistor / PTC. The thermistor temperature sensing system consists of positive temperature coefficient sensors (PTC) embedded in series of three - one between each phase - and a matched solid-state electronic switch in an enclosed control module. A set of sensors consists of three sensors, one per phase. PTC protection built into windings.
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HP Thermistor RK2-0359. A thermistor is an electrical resistor where the resistance-value varies greatly with temperature. All resistances vary somewhat with temperature but in an ordinary resistor this quality is engineered out so far as possible. In a thermistor the variation is deliberately maximised.
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Stainless steel probe dimensions: 1.5 inches long x 0.125 inches in diameter. Length: 36 inch leads. Termination: 3/4 inch dual banana plugs. The Keysight E2308A is a general purpose temperature probe. The thermistor (5 k ohm at 25 degrees C) is encapsulated in a stainless steel case and typically used for liquid temperature measurements.
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Short Lead NTC Epoxy Thermistor (HP Series) HP series epoxy encapsulated thermistors have bead dimensions of 0.14" x 0.16", an operating temperature range from -50°C to 110°C, are available in several base resistances and Betas, can be supplied with tolerances up to ±1.0% at 25°C, and are available with un-insulated leads that have tiebars.
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The wiring diagram below illustrates the implementation of thermistor motor thermal protection in a three-phase motor: PTC Sensors Lead identification. The colours on the PTC leads help determine what trip temperature the PTC sensor is made to handle. The table below shows lead colour identification for PTC sensors used in the internal windings.
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A thermistor is a semiconductor type of resistor whose resistance is strongly dependent on temperature, more so than in standard resistors. The word thermistor is a portmanteau of thermal and resistor . Thermistors are categorized based on their conduction models. Negative-temperature-coefficient (NTC) thermistors have less resistance at higher.
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The 3RN2 thermistor motor protection relays are designed in two widths: 17.5 mm This overall width is used for the 3RN2000 compact tripping relays with 1 changeover contact and with A1 jumpered contact root of the changeover contact and the 3RN2010-.C.30 with 1 NC contact and 1 NO contact.
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The early manual for the 477 thermistor mount (used with the HP 430 power meters) lists the thermistors used in it as Veco 32A5 or W.E. #170575. I suspect that 478 uses a set of four of these matched to produce close to 100 ohms resistance each with the same drive power. Two in the temp compensation leg and two in the RF measurement leg.
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The thermistor —short for thermally sensitive resistor—is a resistor that changes value with the temperature. Thermistors increase or decrease resistance with changing temperatures. Thermistors are broadly divided into two classes: • NTC Thermistor: Negative temperature coefficient-resistance decreases with increasing temperature.