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2308-900-01 Rev. A / July 2008
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Section Topics
2-7
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 2: Basic Power Supply Operation
VPT circuitry is useful in protecting the load from a high positive voltage if one of the remote
sensing leads is disconnected. When in VPT mode, the output is held in the Operate OFF position
until an Operate ON command is received (VPT will be displayed until the output is turned back
on). The voltage protection feature has a clamp setting, which can be turned ON or OFF. If ON,
protection voltage values below 0 volts (-0.6 volts) are not allowed. If OFF, protection voltage can
go negative to the extent of the set voltage - protection voltage.
For example: If PROT=4 V, and SET =6 V, VPT range is from +2 V to +10 V. If the SET voltage is
changed to 2 V and protection clamp set to OFF, the range would equal -2 V to +6 V. However, if
protection clamp is set to ON, the range would equal -0.6 V to +6 V.
To set the VPT value from the front panel:
1. Press
the
MENU
key to access the main menu.
2. Press
the
▲
or
▼
keys to scroll to
VOLT PROTECT
.
3. Press
the
or
keys
to select Channel
#1
or
#2
.
4. Press
ENTER
to select.
5. Press
the
▲
,
▼
, ,
or keys to scroll to the desired VPT value and to select
cOFF
(voltage
protection clamp OFF) or
cON
(voltage protection clamp ON).
6. Press
ENTER
to save your settings and return to the main menu.
NOTE
Table 1-3
shows the menu structure. Rules to navigate the menu follow the
table.
CAUTION
Electrostatic Discharge (ESD) to the output connector pins may cause the VPT
circuitry to turn the output off. Use proper ESD handling precautions before
making any contact with the output connector pins or wires connected to the
pins.
NOTE
Setting changes can be canceled by pressing the
MENU
key.
▲
▲
▲
▲
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