User Manual

Application examples
To meet the stan
dby regulations, the power supply often operates in burst mode,
where, the power is drawn i n small bursts and then the circuit is forced to sleep.
To make accurate standby measurements in burst mode, the PA3000 executes
following:
Samples the waveforms continuously such that no data is missed.
Ave rages all t he measured data to produce a stable result.
Measurement solutions
The PA3000 offers a dedicated Standby Power m ode for quickly checking standby
power on th
e bench. The PWRVIEW software with the PA3000 also offers full
compliance standby power testing to IEC62301 Ed. 2.0. Standard. The 1 A
shunt on the PA3000 offers high resolution and accuracy for testing currents a s
low as 80 μA. This enables the PA3000 to measure standby power as low as
20 mW at 240 V.
Test Setup
Complete the following steps to set up the PA3000 to make the standby power
measurements:
Connect the DUT using a Tekronix Breakout Box (BB1000) as shown in
the wiring diagram. (See Figure 54.)
Use the 1 A shunt on the PA 3000 for better accuracy if the expected current is
below 1 A.
Use the VLO Source connection for voltage. Using the VLO Source terminal
for standby power measurements, moves the v oltage low node to the source
side of the current shunt. This helps eliminate measurement errors due to
current drawn by voltmeter impedance of PA3000. This is important while
ma
king very low standby power measurements. For all other measurements,
VLO Load terminal should be used.
Figure 54: Standby power measurements wiring diagram
128 PA3000 Power Analyzer User Manual