Sifos Technologies PowerSync PSA100 Technical Reference Manual Download Page 31

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PowerSync Analyzer Reference Manual

March 9, 2010

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Trigger1 may be “ARMED” by pressing the

ARM Trigger

button. This enables a trigger to be generated as soon as

the next qualifying signal event on the PoE bus occurs. At that time, the trigger will fire just once and will need to be
re-armed in order to fire again. All triggers in the PowerSync Analyzer test port are a one-shot events.

The

Clear Trigger

button will disarm a previously ARMed trigger where the trigger event has yet to occur, thus

preventing an internal trigger event.

The

Send Trigger

button generates an immediate External (or Event) Trigger that is also useful for initiating meter

measurements. As described in Section 2.3.2, External Triggers are exported to all other test ports in the chassis and
also to the TRIG connector on the chassis controller.

The

Copy Settings

button will open the Port Replication Menu (

see Section 3.1.4

) so that current port trigger settings

may be copied to one or more other ports.

3.1.6. Load

Configuration

A key function of each PowerSync Analyzer test port is to provide a controlled DC current load to the PSE port. The

Load Configuration

resource menu

(Figure 3.8)

offers capability to configure and control both a static DC load

current as well as a transient load current event. It also controls the ability to emulate selected classification power-up
sequences that involve the PSA1200 load subsystem.

As with other configuration and meter
resource meters, the

Load Configuration

menu offers selection of Slot-Port, chassis,
and the ability to replicate settings.

Static Load Current refers to a steady state
DC load current that will be present once
the PoE bus voltage exceeds 15.5 VDC.
This current will not exist below that
voltage. The load current may be typed
into the

Powered Load

entry field or

entered by the slider control. The

Apply

Load

button will then send this

configuration to the selected slot-port and
update the Load Status field. The

Apply

Load

button will annunciate via

red

text

that a change has been selected and must
be applied.

Static load current can range from 0 to 511
mA with a granularity of 0.5 mA. Entered
values will be automatically rounded to
the nearest multiple of 0.5 mA.

The

Mark Load

control is disabled with the PSA-1200 and is reserved for use with future PSA hardware.

Load transients always consist of two sequential load current “steps”, each of which can be programmed to a unique
load current value and step duration. Upon completion of a load current transient, load current will return to the
original static load current value unless the

Hold Step 2 Current

button is selected. In this case, the static DC load

current will be adjusted to the value of the second load transient step current.

The load current value for each transient step ranges from 0 to 511 mA with granularity of 0.5 mA. The duration of
each step may be specified from 200

sec to 1000 mSec. The duration of the second load transient step will be ignored

if the

Hold Step 2 Current

setting is selected since step 2 load current will then become the new steady state load.

Load transients can either be immediately initiated or they can be initiated upon a trigger event. The

Trigger Mode

setting specifies what the initiating mechanism will be.

Immediate

selection will cause the load transient to be

configured and initiated as soon as the

Initiate Transient

button is pressed.