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