公开(公告)号：US5157708A

公开(公告)日：1992-10-20

申请号：US771269

申请日：1991-10-04

申请人： John H. Garthwaite ,  Clay A. Stocklin ,  David M. Rollins

发明人： John H. Garthwaite ,  Clay A. Stocklin ,  David M. Rollins

IPC分类号： H04M3/30

CPC分类号： H04M3/308

摘要： A handheld battery-powered telecommunications test instrument for monitoring the status of a pair of wires. A tone-generating circuit generates a tone signal in response to the user manually selecting operation in a tone-generating mode. The instrument monitors the pair of wires to determine whether an on-hook, off-hook or ringing signal is present on the wires, and if present, generates an interrupt control signal through a microprocessor. Logic circuitry connected to the microprocessor results in connecting and disconnecting the tone-generating circuit and the pair of wires to selectively apply the tone signal to the wires. In response to the control signal and the user selecting the tone-generating mode, the microprocessor connects the tone-generation circuit to the pair of wires if no control signal is generated, and disconnects the tone-generating circuit if the control signal is generated. The presence of the on-hook, off-hook and ringing signals on the pair of wires is determined by measuring the voltage between the pair of wires. A menu is generated by the microprocessor from which the user can select the frequency and amplitude for the tone signal.

摘要翻译： 手持式电池供电的电信测试仪器，用于监控一对电线的状态。 乐音产生电路响应于用户在音调生成模式下手动选择操作而产生音调信号。 仪器监控一对电线，以确定电线上是否存在挂机，摘机或振铃信号，如果存在，则通过微处理器产生中断控制信号。 连接到微处理器的逻辑电路导致音调发生电路和一对导线的连接和断开，以选择性地将音调信号施加到电线。 响应于控制信号和用户选择乐音产生模式，如果不产生控制信号，则微处理器将乐音发生电路连接到一对线，并​​且如果产生控制信号则断开乐音发生电路。 通过测量一对电线之间的电压来确定一对导线上挂机，摘机和振铃信号的存在。 微处理器生成菜单，用户可以从中选择音调信号的频率和幅度。

公开(公告)号：USD332575S

公开(公告)日：1993-01-19

申请号：US751692

申请日：1991-08-29

申请人： John M. Redfield ,  David M. Rollins ,  Clay A. Stocklin ,  Wayne R. Fukahara ,  Denis M. Stack

设计人： John M. Redfield ,  David M. Rollins ,  Clay A. Stocklin ,  Wayne R. Fukahara ,  Denis M. Stack

公开(公告)号：US5193108A

公开(公告)日：1993-03-09

申请号：US771457

申请日：1991-10-04

申请人： Clay A. Stocklin

发明人： Clay A. Stocklin

IPC分类号： H04M3/26

CPC分类号： H04M3/26

摘要： A handheld, battery-powered telecommunications test set which combines the function of tone generator and inductive input probe along with functions such as resistance measurement and continuity/discontinuity. The inductive input is coupled to one input of a differential amplifier, which is susceptible to oscillations caused by leakage currents in the circuits performing other functions. During operation of the inductive input monitor probe, some of these circuits are inactivated, but may still have some leakage current that could flow through them, causing oscillation. Additional circuit elements are added to provide a low resistance pathway to a second input of the differential amplifier to shunt leakage currents from the inactive circuit to the differential amplifier such that the leakage current are converted from a differential signal to a common mode signal and are not amplified. The instrument provides high impedance inputs on circuits which are active when the monitor probe is also active to reduce the leakage currents into the active circuits to an acceptable level.

摘要翻译： 一种手持电池供电的电信测试仪，将音调发生器和感应式输入探头的功能与电阻测量和连续性/不连续性等功能相结合。 电感输入耦合到差分放大器的一个输入，该差分放大器容易受到执行其他功能的电路中的漏电流引起的振荡。 在感应式输入监视探头工作期间，其中一些电路失效，但仍可能有一些可能流过它们的漏电流引起振荡。 添加附加的电路元件以提供到差分放大器的第二输入的低电阻路径，以将来自不活动电路的漏电流分流到差分放大器，使得漏电流从差分信号转换为共模信号，并且不 放大 该仪器在电路上提供高阻抗输入，当监测探头也有效时，它们是有效的，以将进入有源电路的漏电流减少到可接受的水平。

公开(公告)号：US5170429A

公开(公告)日：1992-12-08

申请号：US771467

申请日：1991-10-04

申请人： Clay A. Stocklin ,  David M. Rollins ,  William P. Pierson

发明人： Clay A. Stocklin ,  David M. Rollins ,  William P. Pierson

IPC分类号： H04M1/24 ,  H04M3/30

CPC分类号： H04M3/308 ,  H04M1/24

摘要： A handheld, battery-powered telecommunications test instrument with a talk battery circuit capable of supplying power for up to four telephone sets, which may be connected either in series or in parallel. The instrument determines the configuration of the telephone sets as having serial connections or parallel connections by sensing the amount of current flowing through the circuit of the invention. In response to the amount of current, a transistor automatically operates to supply power to the telephone sets as either a voltage source or a current source and maximizes power transfer between the telephone sets. The instrument has a low power mode to reduce current drain on the battery that is automatically engaged when the telephone sets are not in use.

摘要翻译： 一种手持式电池供电的电信测试仪器，具有能够为多达四台电话机供电的通话电池电路，该电话机可以串联或并联连接。 该仪器通过感测流过本发明的电路的电流量来确定电话机的配置为具有串行连接或并联连接。 响应于电流量，晶体管自动地操作以将电力作为电压源或电流源提供给电话机，并使电话机之间的功率传递最大化。 该仪器具有低功耗模式，以减少当电话机不使用时自动接合的电池上的电流消耗。