| Inputs |
| Input type |
Resistive potential division |
Clamp detection |
Rated value
(range) |
150/300/450 V |
Clamp 96033: 5/10/20/50 A
Clamp 96030: 20/50/100/200 A
Clamp 96031: 50/100/200/500 A
Clamp 96032: 200/500/1000 A |
| Wiring |
CW120 |
Single-phase 2-wire, single-phase 3-wire, three-phase 3-wire |
| CW121 |
Single-phase 2-wire, single-phase 3-wire, three-phase 3-wire, three-phase 4-wire |
Input
resistance |
CW120 |
Approximately 1.5 MΩ |
Approximately 100 kΩ |
| CW121 |
Approximately 1.3 MΩ |
Maximum allowed
input |
495 Vrms |
Clamp 96033: 130 Arms
Clamp 96030: 250 Arms
Clamp 96031: 625 Arms
Clamp 96032: 1000 Arms |
| A/D converter |
Voltage/current input simultaneous conversion, 12-bit resolution |
| Measurement Input functions |
| Method |
Digital sampling |
| Frequency range |
45–65 Hz (reciprocal system), detected from V1 |
| Crest factor |
150/300 V range Rated input: 2 |
Rated input: 3 |
| 450 V range Rated input: 1.56 |
| Active input range |
10–110% of each range |
Display
range |
Lower limit |
All ranges 1.5 V |
0.4% of each range |
| Upper limit |
130% of each range, except 110% for 450 V range |
130% of each range |
| Temperature coefficient |
±0.05% rng/˚C |
±0.07% rng/˚C (including clamp) |
| Display updating interval |
Approximately one second |
| Instantaneous Value Measurement |
| Measurement parameters |
Voltage rms (V), current rms (A), active power (W), frequency
(Hz) |
Measurement accuracy (at power factor 1, including clamp)
Voltage
Current/active power |
±(0.3% rdg + 0.2% rng)
±(0.8% rdg + 0.4% rng) when using clamps 96030, 96031, and
96033
±(1.2% rdg + 0.8% rng) when using clamp 96032 |
| Frequency |
±(0.1% rdg + 1% dgt) |
| Computation parameters |
Reactive power (Var), power factor |
| Computation accuracy |
(value calculated from measurement) ±1 dgt |
| Power factor influence |
±1.0% rng cosø = ±0.5 (relative to power factor 1) when using
clamp 96030
±2.0% rng cosø = ±0.5 (relative to power factor 1) when using
clamps 96031, 96032, and 96033 |
| Reactive factor influence |
±1.0% rng sinø = ±0.5 (relative to reactive factor 1) when using
clamp 96030
±2.0% rng sinø = ±0.5 (relative to reactive factor 1) when using
clamps 96031, 96032, and 9603 |
| Electric Energy Measurement |
| Measured parameters |
Active electric energy, regenerative electric energy (regenerative electric energy is not displayed
on the screen; it is merely saved) |
| Measurement accuracy |
Active power measurement accuracy ±1 dgt (with standard settings) |
| Integration function settings |
Start/stop settings: Manual, timer, external trigger (control)
Output intervals: 1/2/5/10/15/30 seconds; 1/2/5/10/15/30 minutes; 1 hour |
| Displayed digits |
This is set automatically based on the rated power, and the minimum resolution can be set |
| Saving items |
| Saving items |
Voltage, current, active power, reactive power, power factor, frequency, active electric energy,
regenerative electric energy |
| Display Functions |
| Display screen |
Backlit segmented LCD |
Maximum number of displayed digits
Electric energy
Other parameters |
6 digits
4 digits |
| Range makeup |
(rated values) |
| Communication Functions |
| Electrical specifications |
Conforms to EIA RS-232 or EIA RS-485. |
| Protocols |
CW120/121 proprietary protocol, Power Monitor protocol
(Standard protocol used for YOKOGAWA M&C's Power
Monitor)
PC link communication (Standard protocol used for
YOKOGAWA M&C’s Temperature Controllers)
MODBUS communication (ASCII or RTU) |
| Synchronization system |
Start stop synchronization |
| Baud rates |
1200, 2400, 4800, 9600, 19200, 38400 bps |
| PC card interface |
| Slot |
PC card slot TYPE II |
| Compatible card: |
ATA flash memory card |
| Function specifications |
Saving measurement data, saving and reading settings data |
| Faulty Wiring Checking Functions |
| Check details |
Presence/absence of power input; check for frequency measurement range; voltage phase
sequence;
presence/absence of power input; whether current clamp is reverse-connected |
| Scaling Function |
The VT ratio and CT ratio can be set.
Settings ranges |
VT ratio: 1–10,000
CT ratio: 1–10,000 (in increments of 0.01) |
| External Control I/O (for RS-232 only; not provided for RS-485) |
| These input and output can be used as signals for starting and stopping integrating measurement. |
| Control input |
TTL level or contact |
| Control output |
TTL level |
| Other Functions |
| Clock (typical precision: ±100 ppm), key lock, system reset |
| General Specifications |
| Environmental requirements: Indoor usage at an altitude of 2000 meters or less. |
| Usage temperature and humidity ranges |
0–50°C, 5–85% RH (no condensation)
0–40°C, 5–85% RH (no condensation) for UL, C-UL |
| Insulating resistance |
500 V DC, 50 MW or greater
Between voltage input terminals and case
Between voltage input terminals and current input terminals, communication terminals, and control
I/O terminals
Between power line and case
Between power line and current input terminals, communication terminals, and control I/O
terminals |
| Insulating withstand voltage |
5550 V AC for one minute
Between voltage input terminals and case
3320 V AC for one minute
Between voltage input terminals and current input terminals, communication terminals, and
control I/O terminals
2300 V AC for one minute
Between power line and case
Between power line and current input terminals, communication terminals, and control I/O
terminals |
| Power supply |
100–240 V AC ±10%, 50/60 Hz |
| Consumed power |
8 VA maximum |
| External magnetic field effects |
Within accuracy levels at 400 A/m |
| External dimensions |
Approximately 117 x 161 x 51 mm (W x H x D) |
| Weight |
Approximately 0.6 kg |
| Connectors |
| RS-232 |
Mini DIN 8-pin |
| AC power supply |
2-pin |
| Accessories |
| Voltage input probes |
3 for CW120, 4 for CW121 |
| Power cord, user's manual, operation guide, Toolbox (setting software) |