Teledyne LeCroy CPCI-H110 - Manual (Page 3)

3
INTRODUCTION
The CPCI-H110 Passive Extender, can be used in any 6U CompactPCI H110 compatible system.
The CPCI-H110 Passive Extender board has short circuit and over current protection for all voltages to protect the
system motherboard, the power supply and the UUT from being damaged when an unknown board is plugged in.
On-board current-to-voltage circuitry is designed in to allow current measurement for the +5V, +3.3V and +12V, using
only a Voltmeter at the provided terminals.
The CPCI-H110 has easy access test points for all CPCI-H110 bus signals for connection to scope or logic analyzer
probes.
Voltage margin testing of UUT boards can be facilitated when using the CPCI-H110 extender board. By removing the
pre-assembled jumpers, the system bus voltages can be isolated and external voltages can be connected to the UUT via
the external inputs.
All the FT voltages specified in the CPCI H110 specification are routed straight through.
INSTALLATION
To install this Extender board, make sure to turn the PC power off. Insert the Extender in any available slot and secure
it’s bracket to the main chassis. You are now ready to use your new extender board.
OPERATION
This Extender board provides the following extra features listed below:
CURRENT MEASUREMENT
To measure the current being drawn by the Unit-Under-Test, just connect a voltmeter to J3. Every Volt read by the meter
represent One Amp. So if the voltmeter reads 0.35, it represents that the Unit-Under-Test is drawing 350 milliampere of
current. J3 terminals are marked for Ground, +5I, +3.3I and +12I.
NOTE: If the VIO and +5V are on the same plane on your board, you need to remove JP10 jumper, located on the
extender board, in order to get an accurate current measurement for the +5V.
CURRENT LIMIT CIRCUITRY
Red LEDs, when illuminated, indicate a short or a very low voltage. Green LEDs when illuminated, indicate voltages at
their corresponding outputs. In the case of a short on the +5V, +12V, or +3.3V from the Unit Under Test, this extender
will automatically switch the current limit down to about 200 milliampere and will continue to deliver this current for
troubleshooting purposes. In the case a short or excessive current draw on the -12V, a resetable fuses will remain open
up until the problem is corrected.
The current limit value for the +5V is set to 10 Amps with JP2 not installed and 2 Amp with JP2 installed.