Sifos Technologies PowerSync PSA100, Technical Reference Manual, Page: 123 / 147

PowerSync Analyzer Reference Manual
March 9, 2010 Sifos Technologies page 123
Here’s a short script to perform this test:
While not yet fully optimized for multi-port testing, this script provides an example of tailoring various configuration
parameters to the characteristics of the PSE being tested. The importance of pre-characterizing the behavior of the PSE
is critically important to the “hard-coding” of trigger and synchronization configurations. This fact is further
highlighted by observing detection signals from the same PSE now with 4 other ports in the powered-up state.
Figure 8.3
Pre-Detection Signaling – 4 ports powered
Figure 8.4
Power-Up Sequence – 4 ports powered
As can be seen, selection of ideal trigger levels and synchronization levels must not only take into account the
type
of
PSE, but perhaps even the
state
of the PSE, as is the case in this example.
Two other examples where known characteristics of a PSE can be utilized to save test time are detection signature band
and port power capacity. The following excerpt from a PSE Conformance Test provides useful information in the
design of this test script for a particular PSE.
# Configure test port for valid signature
passive 1,1 r 26 c 0
# Configure Vpeak Measurement
vdcpeak 1,1 trig on max period 200m timeout 10
# Sync to trailing edge of pre-detection pulse (uses Trigger 1 !)
psa_det_sync 1,1 falling level 2.5
# Setup trigger for Vvalid(Max) measurement
trig1 1,1 rising
# Connect the detection resistance by connecting the port switch
port 1,1 connect
# Recover the peak voltage of the detection pulse
set status [ psa_wait 1,1 vdcpeak ]
set VvalidMax [lindex $status 3]
# Force a power-down by opening port switch, setting load to zero
psa_disconnect 1,1
# Configure the Time Interval Measurement
# Trigger level and polarity of falling at level 2 also used for sync
timint 1,1 start falling level 2 stop rising level 40 msec
# Synchronize to the end of pre-detection pulse
psa_det_sync 1,1 falling level 2
# Connect the detection resistance by connecting the port switch
port 1,1 connect