Technical data

Operation and Features 2
Programming the Overvoltage Protection
E364xA User’s and Service Guide 45
Figure 2-1 Recommended protection circuit for battery charging
When the E364xA is powered up or down, the output voltage
will overshoot to not more than
±1 V (i.e., +1 V max during
power up and –1 V max during power down).
To prevent this voltage overshoot, Agilent recommends you
to connect the diode(s) in series at the device- under- test’s
(DUT) input supply as shown in Figure 2- 2. This will block
VOLT:PROT:STAT {OFF|ON) Disable or enable the
OVP circuit.
VOLT:PROT:CLE Clear the tripped OVP
circuit.
NOTE
The power supply’s OVP circuit contains a crowbar SCR, which effectively
shorts the output of the power supply whenever the overvoltage condition
occurs. If an external voltage source such as a battery is connected across
the output, and the overvoltage condition inadvertently occurs, the SCR
will continuously sink a large current from the source and possibly
damaging the power supply. To avoid this, a diode must be connected in
series with the output as shown in Figure 2-1.