Yokogawa-original A/D converter (feedback pulse width modulation method) features superior noise immunity, stability and high-speed sampling. In addition, versatile functions are suitable for system use and cover a wide variety of applications from test to R&D.
The Precision Digital Thermometer offers various computations functions and software calibration functions. The 7563 also features:
|Drift Data (zero point of DC V)|
For the temperature measurement (RTD), high resolution of 0.01°C (0.01°F) can be obtained. In DC V and resistance measurement, the resolution of 100 nV and 100 μohm can be obtained with high stability. (see below)
In addition, the high-speed sampling rate of up to 10 ms are available for the study of biometeorology/medical development of electronic components where the rapid and precise temperature measurement are required.
4 types of RTDs (2-wire/3-wire/4-wire) and 12 types of TC's are available for use in a wide range of applications. In addition, DC V and Resistance (2-wire/4-wire) measuring functions are also available in a single instrument.
TC: 12 types (R, S, B, K, E, J, T, L, U, N, W and KPvsAu7Fe) RTD: 4 types (Pt100, JPt100, Pt1000 and J263*B)
High-accuracy reference junction compensation:
Compensation accuracy (±0.2°C) Input terminals are provided on both front and rear panels, and an input site is switch selectable. The rear panel input terminal has an isothermal structure, and it is provided with windbreak cover of one-touch type.
The 7563 uses a YOKOGAWA-original transistor temperature sensor in the reference junction compensation circuit. A compensation accuracy of ±0.2°C (±0.4°C) is realized together with the isothermal structure of the input terminal.
Adjustment function of R0 expands the 7563's input ranges. As adjustment range of this function covers 0 to 2,000 ohm with 0.001 ohm resolution, the combination of this function and three ranges for Pt RTD sensor offers the customer to use almost all types of RTD sensors available in the world.
IC memory card expands the applicability. It is possible to save up to 8,000 measured data as a buffer memory. It also allows you to save the panel setting conditions and read them automatically at power ON (AUTO LOAD). In addition, measuring parameters can be programmed in up to 20 steps into the IC memory card.
The 7563 incorporates a bidirectional communication function which supports the system use. Not only the measured data output, but also all the functions executed by panel key operation excluding only the power supply ON/OFF operation can be controlled from a host computer by a powerful set of commands.
Temperature Correction by Means of the Scaling Function
In addition to the noise elimination by moving average function and offset compensation (NULL), a scaling function and comparator function are also available. (Example) When TC is calibrated at a reference temperature (Ts), the correction for measured value (Tx) can easily be obtained by using the scaling function. (Figure 5) Scaling function: (X-A)/B, provided that, A = 0, B = Tx/Ts
Calibration of DC V and W can be executed by simple panel key operation or via communication interfaces. Calibration values for temperature measurement ranges are automatically calculated by only giving reference inputs for DC V and W ranges.
STORE mode is in halt status until the next trigger signal is generated. The STORE mode is automatically turned OFF when memory capacity is full. In RECALL mode, data are recalled whenever a trigger signal is generated according to measurement mode. In AUTO mode, data are automatically recalled at measurement intervals which have been set at the time of recall.
The time interval between a trigger signal generation and the sampling can be set from 0 to 60 minutes. This allows accurate measurements when a signal source has dead-time or the measurement circuit shows a first-order lag response.
Y = X - X0
X0?: initially set value (NULL value)
Y : computed value
X : measured value
Reset an initially set value (data being displayed) to zero as NULL value. Thereafter a value subtracted by a NULL value is displayed as a measured value. This null function is used to eliminate leadwire resistance or cancel initial values.
The AVG function is used to average the measured data. This comes into effect when noise components or variation of measured data at high-speed sampling must be eliminated from the measured value. The calculation expression is given by:
Y = (XAT?+ XAT-1 + .... + X1) / AT
AT: 2 to 100 (number of average data)
X: measured value
Y: computed value
The scaling function serves not only to indicate a multiple with preset multiplying factors but also to determine deviation from a preset reference value.
The comparator function compares a measured value (or null or averaging values) with the reference value to determine which value is larger or smaller if the measured value is within the limits.
IC memory cards allow measurement parameters and conditions to be set without using the panel keys. If an IC memory card containing set data is inserted and then the power is turned ON, the memory contents are automatically read and programmings are set.
This is very useful for measurements that are repeated under the same conditions, and this can be a powerful support tool such as in the production line.
If an IC memory card is installed, up to 20 steps can be programmed either by front panel key operations or via communication interfaces.
The required functions, ranges, and mathematical functions can be set ON or OFF, and multichannel measurements can be performed in a combination with scanners.
The AZ key turns ON or OFF AUTO ZERO. AUTO ZERO (AZ) compensates for zero drift which will be generated in the internal circuit every time sampling is executed. In high speed sampling mode, measurement time is decreased by eliminating AUTO ZERO functions.
The multimeters can be calibrated either by front panel key operations or via communication interfaces. The multi-meters are calibrated without opening the case and without any special calibration skills.
This optional feature specifies any data of 3-1/2 or 3 digits on the display and converts it to the analog data with the range of 00 mV or V.
This function is ideal for both long-time temperature measurement and small change of measurement.
By using a programmable scanner 750101 the multi-point measurement of up to 50 points is possible.
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