Basic Power Supply Operation 2-5
Outputting voltage and current
NOTE For the Model 2306-VS, if trigger external is enabled and current limit tripping or
VPT occurs, the display is turned on and the output is turned off. See Section 6.
Setting voltage protection value
NOTE The VPT value (voltage protection value) is channel specific. The number after the #
indicates the channel affected by editing.
Voltage protection circuitry (VPT) is provided for the battery and charger channels. This
function monitors the SOURCE
+ pins (see on page 2-3 or on page 2-4) with respect to the
2306’s internal ground and will shut off the output voltage for either channel when the protection
v
oltage range (which equals the set voltage ± protection voltage) set by the user is exceeded.
This voltage is typically not the same voltage as at the device under test due to lead impedance
and internal sense resistor losses. VPT circuitry is useful in protecting the load from a high pos
-
itive voltage if one of the remote sensing leads is disconnected. When in VPT mode, the output
is held in the Operate O
FF position until an Operate ON command is received (VPT will be dis-
played until the output is turned back on). The v
oltage 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
v
oltage - protection voltage.
For example: If PROT=4V, and SET =6V, VPT range is from +2V to +10V. If the SET voltage
is cha
nged to 2V and protection clamp set to OFF, the range would equal -2V to +6V. However,
if protection clamp is set to ON, the range would equal -0.6V to +6V.
NOTE T
able 1-3 shows the menu structure. Rules to navigate the menu follow the table.
NOTE Electrostatic Discharge (ESD) to the output connector pins may cause the VPT cir-
cuitry to turn the output off. Use proper ESD handling precautions before making any
contac
t with the output connector pins or wires connected to the pins.
Procedure
To set the VPT value from the front panel:
1. Press the MENU key to access the main menu.
2. Select VOLT PROTECT #1 or #2 by scrolling through the primary menu items (use the
â–² and â–¼ keys to scroll). Scroll until VOLT PROTECT is displayed on the bottom line.
3. Select channel for VPT. Toggle between VOLT PROTECT #1 or #2 using the
â–²
and
â–²
keys.
4. Press ENTER.
5. Use the
â–², â–¼,
â–²
and
â–²
keys to key in the desired VPT value and to select cOFF (voltage
protection clamp OFF) or cON (voltage protection clamp ON). Setting changes can be
canc
eled by pressing MENU.
6. Press ENTER to save and return to main menu.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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