The Yokogawa CA450 process multimeter is an on-site measuring instrument that combines the functionality of a digital multimeter for basic
measurements such as voltage, current, and resistance, with a 4-20mA loop calibrator for electrical and process measurements. With specialized
functions for repair, maintenance, and troubleshooting of plant equipment, the Yokogawa CA450 is a single-unit, on-site measuring solution that reduces
the engineering load and improves plant efficiency by accomplishing tasks that have traditionally required two on-site measuring instruments.
The CA450 is a true RMS digital multimeter with a basic accuracy of 0.05% and dedicated sensor modes for direct inputs from sensors such as
AC/DC clamp probes. In addition, the meter incorporates a number of process-related features including loop check and 4-20 mA output generation
and measurement functions.
With the loop check function, designed for tests on 2-wire transmitters, the CA450 supplies 24 VDC power to the transmitter and measures the DC
output in milliamperes to an accuracy of 0.05% up to 30 mA. A HART mode with loop power and 250 ohm resistance allows HART and BRAIN communications
to be tested. A transmitter simulator function allows transmitter I/O to be checked by drawing in ('sinking') designated currents from the external
voltage generators of the instrumentation. The 4-20 mA generator output includes span, step, auto-step and sweep capabilities.
The CA450 can also be used to carry out operating checks and adjustments on valve positioners, including zero span adjustment, response testing
using the auto-step function, and tests for hunting, sticking/slipping and valve open/close errors. Controller programs can also be verified using the
CA450's 4-20 mA step generation function, which switches between 4 and 20 mA in 4mA output steps.
Electrical measurements include power supply peak-to-peak measurement with instantaneous detection in the DC voltage measurement mode, and AC/DC
current measurement up to 180 A AC and 3000 A AC in sensor mode. The CA450 can also be used to check panel meters for correct connection, reproducibility
and errors. The CA450 features a safe design with current terminal shutters to protect both the operator and the instrument against incorrect connection.
It conforms to the 600 V CAT. IV and 1000 V CAT. III standards. An optional adapter allows the instrument to be linked with a PC, with data transferred
via an infrared USB interface.
The Yokogawa CA450 process multimeters ship complete with:
- Batteries
- Test leads
- Lead cables
- Fuses
- Instructional manual
Measurement Functions
| Specification |
Range |
Accuracy |
| DC Voltage |
600.0 mV to 1000 V |
0.09% rdg+1 dgt |
| AC Voltage |
600.0 mV to 1000 V |
0.5% rdg+5 dgt |
| DC Current |
30.000 mA |
0.05% rdg+2 dgt |
| |
30.000 mA |
0.05% rdg+2 dgt |
| Impedance |
600.0Ω to 60.00 MΩ |
0.2% rdg + 1 dgt |
| Frequency |
199.99 Hz to 19.999 kHz |
0.005% rdg + 1 dgt |
| Diode Test |
2.000 V |
1% rdg + 2 dgt |
| Continuity |
Beeps under 50 ±30Ω |
| Display Update |
2.5 to 5 times per second |
| Data Hold |
Yes |
| Peak Hold (DCV) |
Yes |
| Standard Deviation |
Yes |
| Max/Min |
Yes |
Source Functions
| Specification |
Range |
Accuracy |
| DC Current |
0.001 to 25.000mA |
0.05% to span of 20.000mA |
| Simulate (sink) |
0.001 to 25.000mA |
0.05% to span of 20.000mA |
| Loop Power Function |
24V with 250Ω resistance ON/OFF function |
| Auto-step |
Yes |
| Auto-sweep |
Yes |
| Step (manual) |
Yes |
General
| Specification |
Details |
| Safety Standard |
EN61010/1000VCAT III, 600VCAT IV |
| Communication (optional) |
IR-USB |
| Backlight |
Yes |
| Operating temperature |
-20 to +55°C |
