• CA450-E/TE
  • Usually ships in 1-2 weeks



  • Simultaneous 24 V loop power and mA measurement
  • HART mode setting with loop power (250 OHM resistance)
  • SIMULATE (SINK) function simulates transmitters
  • 4-20 mA span/step/auto-step/sweep output
  • High accuracy signal measurement: DC mA 0.05%/30.000 mA
  • Handheld DMM function
  • Peak/Hold function for DCS power peak-to-peak measurement
  • Dedicated sensor modes for direct reading of many sensor signal types
  • Current terminal shutter prevents incorrect connections
  • Sensor function handles AC load current measurement
  • Meets 600 V CAT. IV, 1000 V CAT. III safety standards


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


Specification Details
Safety Standard EN61010/1000VCAT III, 600VCAT IV
Communication (optional) IR-USB
Backlight Yes
Operating temperature -20 to +55°C