Why does the SNMP value reading from upsAdvOutputCurrent show 0 A with small loads attached to Smart UPS products?

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Issue

Why does the SNMP value reading from upsAdvOutputCurrent show 0 A with small loads attached to the Smart UPS?

Product Line

UPS Network Management Card 1 (NMC1) - AP9617, AP9618, AP9619
UPS Network Management Card 2 (NMC2) - AP9630/AP9630CH, AP9631/AP9631CH, AP9635/AP9635CH
Various Smart UPS models

Environment

All serial numbers
All firmware versions
SNMP users
Users with small UPS loads

Cause

The SNMP value upsAdvOutputCurrent reflects the current in amperes drawn by the load of the UPS.

In Smart UPS units, if the load connected to the UPS is less than one ampere, this value shows 0 A. This is due to the UPS units ability to measure small loads accurately. With small loads, the rate of accuracy is low. With a larger load, the UPS will provide a more accurate load rating.

Resolution

We recommend to query other SNMP values such as upsAdvOutputLoad, which gives a more accurate rating of the load in %.