iL Series User Manual
14
Rev B
California Instruments
2.8 OVP Considerations
The overvoltage protection circuit senses voltage near the output terminals, not at
the load. Therefore the signal sensed by the OVP circuit can be significantly higher
than the actual voltage at the load. When using remote sensing, you must program
the OVP trip voltage high enough to compensate for the voltage drop between the
output terminals and the load.
2.9 Output Rating
In remote sense applications, the voltage drop in the load leads subtracts from the
available load voltage (see "Remote Sensing Capability" in Section 5) As the AC
source increases its output to overcome this voltage drop, the sum of the
programmed voltage and the load-lead drop may exceed the AC source's maximum
voltage rating. This will not damage the unit, but may trip the OV protection circuit,
which senses the voltage at the output terminals.
2.10 Trigger Connections
The BNC trigger connectors on the rear panel let you apply trigger signals to the AC
source as well as generate trigger signals from the AC source. The electrical
characteristics of the trigger connectors are described in section 5.3. More
information on programming external triggers is found in chapter 5 of the AC source
SCPI Programming Manual.
•
Trigger IN allows negative-going external trigger signals to trigger the
ac source.
•
Trigger OUT generates a negative-going pulse when the selected transient
output has occurred.
2.11 Digital Connections
This connector, which is on the rear panel, is for connecting the fault and the inhibit
signals. The fault (FLT) signal is also referred to as the DFI signal in the front panel
and some SCPI commands. The inhibit (INH) signal is also referred to as the RI
signal in the front panel and some SCPI commands.
The connector accepts wires sizes from AWG 22 to AWG 12. Disconnect the
mating plug to make your wire connections. The electrical characteristics of the
digital connectors are described in section 5.3. More information on programming
the digital connectors is found in chapter 6 of the AC source SCPI Programming
Manual.
Note: It is good engineering practice to twist and shield all signal wires to
and from the digital connectors
The following examples show how you can connect the FLT/INH circuits of the AC
source.
In example A, the INH input connects to a switch that shorts pin + to GND pin
whenever it is necessary to disable output of the unit. This activates the remote
inhibit (RI) circuit, which turns off the AC output. The front panel
Prot
annunciator
Summary of Contents for 3000iL
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