Digital Power Meter Specifications

Feature

4-1850

 20-1850, 21-1850CI
Watts 0 - 1850 0 - 1850
Kilowatt-Hours 0.001 - 9999 0.001 - 9999
User Cost (cents/kWh) 0 - 99 0 - 99
Average Monthly Cost Yes Yes
Amps RMS NA 0.20 - 15.00 (+/-3%)*
Volts RMS NA 0 - 130.0
Power Factor NA 0.000 - 1.00 (+/-5%)
VARS NA 20 - 1850 (+/-5%)*
Volt-Amps NA 20 - 1850 (+/-5%)*
Peak Watts NA Yes
Elapsed Time Yes Yes
Accuracy (except as noted) +/-2%, +/-2 least sig. digit +/-1.5%, +/-2 least sig. digit
User Recalibration NA Yes
Logging Memory NA 8,121 Average Power Samples, 21-1850CI only
Sample Interval NA 1 min - 2 hours, 21-1850CI only
RS-232 specs NA 9600 bps, 8N1, 21-1850CI only

A dual-range option, 185 Watt / 1850 Watt range, is available for all power meters.  This option allows you to accurately measure and display power in 0.1 Watt increments up to 185 Watts.  The normal 1850 Watt range displays readings in 1 Watt increments.

The 4-1850 WX model has the same general specifications as the 4-1850 with an added peak wattage measurement feature, useful for determining if a refrigerator has gone through a defrost cycle during the monitoring period.  Click here for more info. 

* VAR, VA and Amps RMS readings below 0.20 amps are generally not accurate.  See instructions.