An absence of voltage indicator has an isolation circuit, an FM modulator attached to the isolation circuit, a reference oscillator, and a mixer attached to the reference oscillator and the FM modulator, wherein the output of the mixer is the difference of the two signals. In one embodiment, the FM modulator includes a variable capacitor which varies in response to a voltage in parallel to a fixed capacitor and an inductor in parallel to the capacitors.

An absence of voltage indicator has an isolation circuit, an FM modulator attached to the isolation circuit, a reference oscillator, and a mixer attached to the reference oscillator and the FM modulator, wherein the output of the mixer is the difference of the two signals. In one embodiment, the FM modulator includes a variable capacitor which varies in response to a voltage in parallel to a fixed capacitor and an inductor in parallel to the capacitors.

A battery stack plate including a housing is provided. The housing has a first sub housing and a second sub housing. Each of the first and second sub housings has a coupling portion coupling the first and second sub housings to each other. The coupling portion includes a protruding portion provided on a coupling plate side face on which the first sub housing and the second sub housing are coupled to each other, and a recessed portion provided on the coupling plate side face at a position shifted from the protruding portion in the up-down direction.

A battery stack plate including a housing is provided. The housing has a first sub housing and a second sub housing. Each of the first and second sub housings has a coupling portion coupling the first and second sub housings to each other. The coupling portion includes a protruding portion provided on a coupling plate side face on which the first sub housing and the second sub housing are coupled to each other, and a recessed portion provided on the coupling plate side face at a position shifted from the protruding portion in the up-down direction.

The present invention relates to a method for the automatic monitoring of an electrotechnical work flow and to a corresponding device. The method comprises the following steps: establishing (S0) a first bidirectional communications link (F1) between a mobile communications unit (1) and a mobile voltmeter (10); starting (S1) a work step sequence program on a mobile communications unit (1) by means of an input device (1b) of the mobile communications unit (1); outputting (S2) a work step instruction (A) to disconnect a live electronic component (K1) in order to effect an absence of voltage at the electronic component (K1) on an outputting device (1a) of the mobile communications unit (1) by the work step sequence program; automatically or manually confirming (S3) the disconnection of the electronic component (K1) at the mobile communications unit (1); following the confirmation (S3) of the disconnection of the electronic component (K1), outputting (S4) a work step instruction (A) to check the absence of voltage at the electronic component (K1) by means of the mobile voltmeter (10) on the outputting device (1a) of the mobile communications unit (1) by the work step sequence program; checking (S5) the absence of voltage at the electronic component (K1) by means of the mobile voltmeter (10); communicating (S6) the result of the check from the mobile voltmeter (10) to the mobile communications unit (1); if the result of the check indicates an absence of voltage, automatically confirming (S8) the check of the absence of voltage from the electronic component (K1) by outputting a confirmation signal by the mobile communications unit (1); if the result of the check does not indicate an absence of voltage, outputting (S9a) a first alarm signal by the mobile communications device (1).

The present invention relates to a method for the automatic monitoring of an electrotechnical work flow and to a corresponding device. The method comprises the following steps: establishing (S0) a first bidirectional communications link (F1) between a mobile communications unit (1) and a mobile voltmeter (10); starting (S1) a work step sequence program on a mobile communications unit (1) by means of an input device (1b) of the mobile communications unit (1); outputting (S2) a work step instruction (A) to disconnect a live electronic component (K1) in order to effect an absence of voltage at the electronic component (K1) on an outputting device (1a) of the mobile communications unit (1) by the work step sequence program; automatically or manually confirming (S3) the disconnection of the electronic component (K1) at the mobile communications unit (1); following the confirmation (S3) of the disconnection of the electronic component (K1), outputting (S4) a work step instruction (A) to check the absence of voltage at the electronic component (K1) by means of the mobile voltmeter (10) on the outputting device (1a) of the mobile communications unit (1) by the work step sequence program; checking (S5) the absence of voltage at the electronic component (K1) by means of the mobile voltmeter (10); communicating (S6) the result of the check from the mobile voltmeter (10) to the mobile communications unit (1); if the result of the check indicates an absence of voltage, automatically confirming (S8) the check of the absence of voltage from the electronic component (K1) by outputting a confirmation signal by the mobile communications unit (1); if the result of the check does not indicate an absence of voltage, outputting (S9a) a first alarm signal by the mobile communications device (1).

Disclosed in the present invention are a chip port state detection circuit, a chip, and a communication terminal. The chip port state detection circuit, by means of a port detection conversion circuit, converts the state of a port to be detected into a corresponding voltage and respectively outputs same to a first comparator and a second comparator, which, after comparing same with a corresponding input reference voltage, output a logic signal to a chip ID determination circuit to obtain a chip ID corresponding to the state of the chip port to be detected, in order to distinguish multiple identical chips.

Disclosed in the present invention are a chip port state detection circuit, a chip, and a communication terminal. The chip port state detection circuit, by means of a port detection conversion circuit, converts the state of a port to be detected into a corresponding voltage and respectively outputs same to a first comparator and a second comparator, which, after comparing same with a corresponding input reference voltage, output a logic signal to a chip ID determination circuit to obtain a chip ID corresponding to the state of the chip port to be detected, in order to distinguish multiple identical chips.

An absence of voltage detection system has an isolation module connected to a voltage source to be detected an I/O accessory module connected to the isolation module wherein the I/O accessory module is configured to allow remote activation of the isolation module.

An absence of voltage detection system has an isolation module connected to a voltage source to be detected an I/O accessory module connected to the isolation module wherein the I/O accessory module is configured to allow remote activation of the isolation module.