Output Safety Cover | Analog Connector |
| |
+ Local Sense Terminal | + Output Bus Bar | ||
Signal Common | Local Sense Jumpers | Rear Knockouts | |
Bottom Knockout |
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|
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A Insert screwdriver blade in slot and pry out | B Bend along joint and break off | ||
WARNING
DO NOT LEAVE UNCOVERED HOLES IN OUTPUT COVER. IF TOO MANY
KNOCKOUTS HAVE BEEN REMOVED, INSTALL A NEW COVER.
Figure 4-4a. Series 667xA Rear Panel Output Connections
The earth ground terminal on the rear panel is a
Load Considerations
Capacitive Loads
In most cases, the power supply will continue to be stable with additional external load capacitors. However, large load capacitors may cause ringing in the supply's transient response. It is possible that certain combinations of load capacitance, equivalent series resistance, and load lead inductance will result in instability. If you need help in solving a stability problem, contact a service engineer through your local Sales and Support Offices (see end of this guide).
If the power supply output is rapidly programmed into capacitive loads, the supply may momentarily cross into constant current (CC) mode. This extends the CV programming time and limits the maximum slew rate to the programmed current divided by the total internal and external capacitance. These momentary crossovers into CC mode will not damage the supply.
Inductive Loads
Inductive loads provide no loop stability problems in CV mode. However, in CC mode inductive loads will form a parallel resonance network with the power supply's output capacitor. Generally, this will not affect the stability of the supply, but it may cause ringing of the current in the load. Ringing will not occur if the Q (quality factor) of the parallel resonant network is ≤1.0. Use the following formula to determine the Q of your output.
User Connections 69
