LM15 Application:

Typical 15 Ampere 120VAC electrical service is supplied by circuit breakers that utilize magnetic trip mechanisms. High peak currents can trip these breakers although the RMS or average current is much lower.
The display of the LM15 meter family follows the peak load current to better indicate available service.
(Peak pulse durations of less than 1 millisecond will average to read lower values.)

EXAMPLES OF VARIOUS LOAD TYPES WITH SAME RMS CURRENT:

Current drawn by Resistive Loads such as Lamps, and power factor corrected power supplies Current drawn by a mixture of power supplies with and without power factor correction Current drawn by inexpensive power supplies without power factor correction
Power Factor = 1.0
Conduction Angle = 0 degrees
Pulsed Duty Cycle = 100%
400 Watts True @ 120VAC
Peak Current = 141% of RMS
Average Current = 90% of RMS

LM15 follows near peak
Power Factor = 0.8
Conduction Angle = 37 degrees
Pulsed Duty Cycle = 59%
523 Watts Apparent @ 120VAC
Peak Current = 184% of RMS
Average Current = 69% of RMS

LM15 follows near peak
Power Factor = 0.6
Conduction Angle = 53 degrees
Pulsed Duty Cycle = 41%
627 Watts Apparent @ 120VAC
Peak Current = 221% of RMS
Average Current = 58% of RMS

LM15 follows near peak
LM15 Display characteristics: full brightness value for each of the 9 LEDs
LED #
Amperes
LED1
1.5 A
LED2
3.0 A
LED3
4.5 A
LED4
6.0 A
LED5
7.5 A
LED6
9.0 A
LED7
10.5 A
LED8
12.0 A
LED9
13.5 A
First LED provides detection with less than 1 Amp load.