Yokogawa CA71 Data sheet

<<Contents>> <<Index>>

General Specifications

Model CA51/ CA71 HANDY CAL calibrator

GS 77W02A01-01-E

 GENERAL

The CA51/CA71 HANDY CAL calibrators are comprehensive generating/measuring instruments for all your calibration and equipment checking needs at maintenance sites. The CA51/CA71 can simultaneously generate and measure voltage, current, TC, RTD and pulse signals, thus you don’t need to prepare many instruments. In addition, the incorporated rotary switches of good repute enable operations so smooth that an incorrect measurement caused from erroneous operations can be prevented.

 FEATURES

Simultaneous signal generation and measurement capability

The CA71 lets you handle regular tests on TCs, RTDs and various other types of sensors and instruments, as well as operation checks when a problem has occurred. By itself it can generate signals for input to equipment, and check output signal from equipment.

(TC and RTD measurement functions: CA71 only)

AC voltage (including supply voltage) measurement capability

In cases where numerous signal converters and other devices are mounted on a rack or panel, the CA51/CA71 can be used to check the input and output signals of each device, while simultaneously checking the power supply. There is no need for a separate multimeter to measure supply voltage.

A wide array of useful functions

Divided output (n/m) function, Auto-step function, Sweep function, Memory function and Communication function are available.

(Communication function: CA71 only)

Easy Operation

The CA51/CA71 incorporates rotary switches for simple handling. the cables, and you are ready to take measurement.

Just open the cover of carrying case and connect

 FUNCTIONS

Generation and Measurement

Generation and Measurement of Voltage/Current

The CA51/CA71 can generate voltage/current up to 30 V DC/24 mA DC and measure up to 100 V DC/100 mA DC.

4−20 mA Step Function

You can set the signal in 4 mA increments or decrements in order 4 ⇔ 8 ⇔ 12 ⇔ 16 ⇔ 20 mA by one touch operation.

20 mA SINK Function

The 20 mA SINK function can draw current from an external voltage source to the H terminal of SOURSE unit. Thus, the CA51/CA71 can be used in a loop test, for example, as a simulator for transmitters.

Example of Connection

Two-wire transmitter

4-20mA

The figure shows the example of connection to distributor for two-wire transmitter. The CA51/CA71 can draw current (SINK) from supply voltage up to28 V, and check a loop (20 mA SINK range is used). In addition, it can simultaneously measure the output of distributor.

Distributor

－

Equivalent Output of TC/RTD

In addition to10 types of TC (K, E, J, T, N, L, U, R, S and B), RTD (Pt100, JPt100) outputs are available.

The CA51/CA71 can be used for maintenance of industrial instruments for process or various thermometers.

Multi Temperature

The CA51/CA71 can be used as multi thermometer because the measurements for all ranges are available. For RTD, 3-wire measurement is available.

Built-in Reference Junction Compensation Sensor

As a means of easily providing reference junction compensation when TC is generated, you can use the temperature sensor within the CA51/CA71. For more accurate reference junction compensation, use RJ sensor (model: B9108WA) sold separately.

Example of Connection

Instrument to be calibrated (Temperature controller, temperature converter or the like)

(SOURCE)

A B b

The figure shows the example of connection for three-wire RTD thermometer. The equivalent output of temperature set in the CA51/CA71 is input to the instrument to be calibrated. At this time, three-wire connection is required to cancel the wire resistance of lead cable connecting the CA71 and the instrument to be calibrated.

GS 77W02A01-01E

1st Edition: Nov. 2002

<<Contents>> <<Index>>

Generation and Measurement of Pulse

Frequency can be set in the wide range of 1 Hz to 11 kHz. With switch selection, the CA51/CA71 can generate or

measure pulses. It is suitable for checking a flow meter or receiver.

Generation and Measurement of Voltage Pulse and Contact Pulse

The CA51/CA71 can generate and measure voltage pulse (amplitude: +0.1 V to +15 V, zero base waveform) and contact pulse.

Pulse Cycle Function

The set pulse can be output. It is suitable for checking integrating counter. (Any value of frequency and amplitude is settable.)

CPM (count/min), CPH (count/hour) Function

In MEASURE mod (functions for measurement), pulse number per minute is counted. It is suitable for the integration of discontinuous pulse signals from flow meter.

In SOURCE mode (functions for generation), you can select either generation of continuous pulse signals or generation of given number of pulses.

Example of Connection

Flow meter

Power supply (12 V or 24 V)

Pulse signal

(MEASURE)

(SOURCE)

+ +

－

The figure shows the example of connection for measurement of pulse signal integration from flow meter, and generation of pulse signal to receiver like converter, controller or the like. For example, since pulse signal from flow meter is discontinuous, use “CPM/CPH” function for integrating count of pulse number per minute (or per hour).

Pulse receiver (integrati ng counter, pulse converter, controller or the li ke)

Lead cable for measurement

Measurement range setting rotary sw itch Select fr om t he f ollow ing:

AC voltage

DC voltage

TC*

Resistance

TD *

R Frequency, pulse DC current

(* For CA71 only)

POWER key

Various function se ttings (Keys to set various settings) Generated signal setting Divided (n/m) function Memory function

Terminal adapter

(RD031)

Red

(99021)

Bl ac k

The allowable voltage to the ground when the included terminal adapter is attached to the input terminals is 30 Vpeak maximum.

Bla ck

Red

Measurement of Commercial Power Supply Voltage

AC voltage up to 300 V can be measured. World-wide supply voltage can also be measured.

Useful Functions

Divided Output (n/m) Function

The divided output (n/m) function outputs a value n/m times the setpoint of a voltage, current, resistance, TC or RTD signal.

When inputting the percentage of instrument input value within the range of zero to full scale, bothersome calculations for percentage is not required..

Auto Step Function

The auto-step function divides the range of zero to full scale into m equally, increases or decreases the output in a step-by-step manner by changing the variable n of the n/m output from n=0 to m when the divided output function (n/m) is selected.

Sweep Function

The sweep function linearly increases or decreases the output.

Memory Function

With a pair of generated and measured signal values in a set, the CA51/CA71 can handle a maximum of 50 sets of data by means of its built-in memory.

Communication Function

(CA71 only)

By connecting the communication cable (RS-232): 91017, you can read internal memory data and measured value, or set the generated signal from a personal computer.

ARNING

Blac k Blac k

Red

LIGHT k ey

urns on the LCD backlight

Lead cable for s ource (g eneration) (98020)

Signal generation range setting rotary s witch Select from the following: DC voltage TC Resistance RTD Frequency DC current

TEMP k ey Enables temperature monitoring

, p ulse

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