Abstract: A digital data recording apparatus, which can record the exact acquisition time of data, a sampling data identification method thereof, and a program for identifying sampling data, are provided. A CPU 11 reads out the program of a first conversion formula. The CPU 11 uses the first conversion formula to convert a time series of detection temperature data into a time series of actual oscillation frequencies f? of a reference clock signal. At a subsequent step, the CPU 11 calculates the respective normal sampling timings employing the current time as a reference time by dividing a time series of count values by each of the actual oscillation frequencies f? corresponding to the respective count values.

Abstract: A digital data recording apparatus, which can record the exact acquisition time of data, a sampling data identification method thereof, and a program for identifying sampling data, are provided. A CPU 11 reads out the program of a first conversion formula. The CPU 11 uses the first conversion formula to convert a time series of detection temperature data into a time series of actual oscillation frequencies f? of a reference clock signal. At a subsequent step, the CPU 11 calculates the respective normal sampling timings employing the current time as a reference time by dividing a time series of count values by each of the actual oscillation frequencies f? corresponding to the respective count values.

Abstract: A frequency change measuring device includes frequency divider for frequency dividing a measuring signal to produce frequency-divided signals, first counter for counting the frequency-divides signals to calculate frequency-division numbers, frequency division numbers transmitter for transmitting the frequency division numbers in synchronism with the frequency-divided signals, frequency division numbers receiver for receiving the frequency division numbers transmitted from the frequency division numbers transmitter, second counter for counting outputs of a reference clock generator synchronized with a timekeeping device that keeps the standard time, latch unit for latching a count of frequency outputs of the reference clock generator synchronous for generating reference clocks on the basis of signals synchronous with the frequency division numbers, and operations unit for determining a frequency change on the basis of the count and the frequency division numbers.

Abstract: A frequency change measuring device includes frequency divider for frequency dividing a measuring signal to produce frequency-divided signals, first counter for counting the frequency-divided signals to calculate frequency-division numbers, frequency division numbers transmitter for transmitting the frequency division numbers in synchronism with the frequency-divided signals, frequency division numbers receiver for receiving the frequency division numbers transmitted from the frequency division numbers transmitter, second counter for counting outputs of a reference clock generator synchronized with a timekeeping device that keeps the standard time, latch unit for latching a count of frequency outputs of the reference clock generator synchronous for generating reference clocks on the basis of signals synchronous with the frequency division numbers, and operations unit for determining a frequency change on the basis of the count and the frequency division numbers.

Abstract: A frequency change measuring device comprises frequencydivider for frequency dividing a measuring signal to produce frequency-divided signals, first counter for counting the frequency-divided signals to calculate frequency-division numbers, frequency division numbers transmitter for transmitting the frequency division numbers in synchronism with the frequency-divided signals, frequency division numbers receiver for receiving the frequency division numbers transmitted from the frequency division numbers transmitter, second counter for counting outputs of a reference clock generator synchronized with a timekeeping device that keeps the standard time, latch unit for latching a count of frequency outputs of the reference clock generator synchronous for generating reference clocks on the basis of signals synchronous with the frequency division numbers, and operations unit for determining a frequency change on the basis of the count and the frequency division numbers.

Abstract: A frequency change measuring device comprises frequencydivider for frequency dividing a measuring signal to produce frequency-divided signals, first counter for counting the frequency-divided signals to calculate frequency-division numbers, frequency division numbers transmitter for transmitting the frequency division numbers in synchronism with the frequency-divided signals, frequency division numbers receiver for receiving the frequency division numbers transmitted from the frequency division numbers transmitter, second counter for counting outputs of a reference clock generator synchronized with a timekeeping device that keeps the standard time, latch unit for latching a count of frequency outputs of the reference clock generator synchronous for generating reference clocks on the basis of signals synchronous with the frequency division numbers, and operations unit for determining a frequency change on the basis of the count and the frequency division numbers.

Abstract: A devised tilt meter detects tilt of the receptacle installed in the ground and/or in the solid construction, to detect the displacement of a pendulum suspended by thin metal springs. A cavity exists near the middle of the receptacle with a pendulum, the springs, a detector along the lateral side of the receptacle of the tilt meter. Wires for signal and power lines of other tilt meter are easily passed through this cavity. This mechanism with a cavity near the middle of the receptacle is very useful for an array observation of tilt in the ground and/or in a solid construction.

Abstract: A devised strain meter detects displacement on the lateral side of the receptacle after magnification of the displacement by a lever in the receptacle. A cavity exists near the middle of the receptacle with a lever and a detector along the lateral side of the receptacle of the strain meter. Wires for signal and power lines of other strain meters are easily passed through this cavity. This mechanism with a cavity near the middle of the receptacle is very useful for an array observation of strain in the ground and/or in a solid construction.

Abstract: A detector unit of a thermometer of this invention is comprised of a pair of oscillators which are closely installed each other. We make a latch signal of a counter circuit for specially made crystal resonator whose number of proper vibration changes with temperature, and latch a counter value of a counter circuit for reference crystal resonator by said latch signal. We calculate the temperature by a microcomputer using the latched value from the said reference crystal resonator. The power consumption of an electric circuit of the detector unit is less than 0.6 mW under the condition of the supply voltage at DC 2.5V.