How to troubleshoot the YOKOGAWA CA500/CA550 multifunctional process calibrator?

YOKOGAWA CA500/CA550 Multi functional Process Calibration Instrument

Instrument positioning and core use

CA500/CA550 is a portable multifunctional process calibrator, whose core function is to provide standard signal generation and parameter measurement for field instruments such as transmitters, sensors, and controllers. It supports synchronous operation of "generation measurement" and achieves high efficiency and accuracy in instrument calibration. The core difference between the two lies in the addition of HART/BRAN communication function in CA550, which can directly interact with smart meters, read device information, perform loop testing, and output adjustment.

Core functions and technical parameters

1. Overview of core functions

CA500/CA550 supports 6 types of signal generation and 6 types of parameter measurement, covering mainstream calibration requirements in industrial sites. The specific functional comparison is as follows:

Function type supports signal (CA500/CA550 universal) CA550 additional functions

Signal generation includes DC voltage (100mV~30V), DC current (20mA/4-20mA), resistance (400 Ω/4000 Ω), thermocouple electromotive force, RTD simulation, frequency/pulse (1Hz~50kHz/CPM), HART/BRAN communication signal superposition, program scanning (20 calibration points), and automatic data grading (Pass/Tail)

Parameter measurement: DC voltage (100mV~50V), DC current (50mA), resistance (400 Ω/4000 Ω), thermocouple temperature, RTD temperature, frequency/pulse counting. HART device information reading (label, range, diagnostic data), BRAIN device model/serial number reading, calibration data CSV export

Scanning function includes linear scanning (0%~100% linear variation), step scanning (equidistant step output), program scanning (CA500 supports 10 points), program scanning supports 20 points, can associate calibration object information (model, serial number, label), automatically save scanning data and grading results

Data management manually saves 100 pieces of data, scanned data is automatically saved (in CA500 dedicated format), data is saved in CSV format (supporting comma/semicolon/tab separation), USB storage is exported, and folders are automatically classified by "year/month/day"

2. Key technical parameters

Accuracy level: DC voltage ± 0.01% FS, DC current ± 0.01% FS, resistance ± 0.01% FS, temperature (thermocouple) ± 0.1 ℃ (K-type, 0~1000 ℃).

Resolution: DC voltage of 100mV with a range of 1 μ V, DC current of 20mA with a range of 1 μ A, resistance of 400 Ω with a range of 0.01 Ω, and frequency of 500Hz with a range of 0.01Hz.

Output capability: DC current output with a maximum load of 20V (4-20mA range), resistance output with a permissible measured current of 0.1-3mA (400 Ω range).

Communication interface: USB Type B (supports remote control and CA550 data export), HART/BRAN communication port (CA550 specific, stacked on 4-20mA loop).

Operation process and core scenarios

1. Basic operations: Signal generation and measurement

Taking "4-20mA current generation+measurement" as an example, explain the standard operating procedure:

(1) Signal occurrence setting (Function 2)

Function selection: Press the Function 2 key, use the directional keys to select mA (current), and press ENTER to confirm.

Range setting: Press the RANGE key, select 4-20mA (default 0%=4mA, 100%=20mA), and press ENTER to confirm.

Parameter adjustment: Set the output value (such as 8mA) through the numeric keys or UP/DOWN keys, press the OUTPUT ON/OFF key to start the output, and the screen will display "OUTPUT: ON".

Scanning function (optional): If step output is required, enter SETUP → Sweep Setup → Step Sweep, set the interval time (such as 10 seconds) and repeat mode (ON/OFF), press the SWEEP key to start step scanning.

(2) Parameter measurement settings (Function 1)

Function selection: Press the Function 1 key, use the directional keys to select mA (current), and press ENTER to confirm.

Range setting: Press the RANGE button, select 50mA (covering 4-20mA measurement requirements), and press ENTER to confirm.

Loop power supply (optional): If measuring a two-wire transmitter, press the LOOP POWER button, and the instrument will output 24VDC loop power while measuring the transmitter output current.

Data reading: The screen displays the measured values in real-time, and pressing the AVERAGE key can view the 5 times moving average, maximum value, and minimum value.

2. Advanced scenario 1: Temperature calibration (thermocouple/RTD)

(1) Thermocouple temperature occurrence (simulating K-type thermocouple)

Function selection: Function 2 → TC SRC (thermocouple occurrence), select K type with the RANGE key, press ENTER to confirm.

Terminal settings: Go to SETUP → Temperature Setup → TC Terminal, select TC-B (banana plug, supports external reference compensation), set TC-B RJC to ON (enables reference compensation).

Temperature setting: Enter the target temperature (such as 200 ℃) through the numerical keys, press OUTPUT ON/OFF to start the output, and the screen will synchronously display the corresponding thermoelectric potential (such as 8.137mV, in accordance with ITS-90 standard).