GCL能夠在接地電流超出時(shí)提供主動(dòng)保護(hù)。GCL比AE Techron功放中標(biāo)配的地面電流保護(hù)器（一個(gè)2.7ohm電阻器，設(shè)計(jì)在功放機(jī)殼地與COM端口/常用輸出端口之間）的性能更好。這是因?yàn)樵诠ぷ髦校珿CL將功放設(shè)置為待機(jī)狀態(tài)，并且在故障發(fā)生時(shí)提供可視化指示，同時(shí)支持方便重置。
AE Techron’s GCL provides active protection against excessive ground current. It is superior to the factory-default ground-current protection on many AE Techron amplifiers (a 2.7-ohm resistor between the amplifier’s Chassis Ground and COM or Sampled Common output terminals) because it places the amplifier
in Standby, provides a visual indication that a fault has occurred, and can be easily reset.
The GCL protection module is ideal for environments where recirculating ground currents are likely or amplifiers might be incorrectly connected. It is recommended when amplifiers will be connected in multiple configurations or will be used by inexperienced staff members.
The GCL combines several functions into one convenient DB-25 package. A comparator circuit monitors the voltage difference between the system’s input ground and earth/safety ground. If the voltage differential between these two grounds exceeds ±4V, the GCL will automatically place the amplifier in Standby. In addition, the GCL has a second level of protection that monitors the current flow between signal ground and earth ground. When the current between these exceeds safe
levels, the current is limited. This combination of current limit and voltage monitoring provides very robust protection against real-life measurement mistakes and DUT failures.
When the GCL module protections are activated, the red LED located on the top of the GCL will illuminate and the amplifier will be placed in Standby. When the ground potential between the two terminals decreases to a safe level, the red LED will turn off, and the amplifier will be brought out of Standby mode.
The GCL plugs into the DB-25 Interlock/IO connector located on the amplifier’s back-panel SIM input card and can be used on all AE Techron amplifiers that use a SIM card. Since the GCL is a “feedthrough” device, the DB-25 Interlock/IO connector can still be used for other purposes and applications when the GCL is in place.
Specifications
Power Supply: Self-powered through DB-25 connector
Activation Level: ±4V (1.5 A)
Dimensions(HxWxD): 2.5 in. x 2.2 in. x 0.7 in. (64 mm x 56 mm x 18
mm)
Features
? Provides active protection against excessive
ground current.
? Replaces the 2.7-ohm resistor used on many
AE Techron amplifiers.
? Automatically places the amplifier in Standby.
? Red LED notifies the user of GCL activation.
? Fast, easy installation.
Refer to Figure 1 and complete the following steps to
install the GCL module.
1. Remove the 2.7-ohm resistor installed between
the COM or Sampled Common terminal and the
Chassis Ground terminal located on the amplifier’s
back panel.
2. Plug the GCL module into the DB-25 connector located
on the SIM input card on the amplifier’s back
panel. Tighten the GCL’s two mounting screws to
attach the GCL firmly to the amplifier back panel.
3. Attach one wire from the GCL to the amplifier’s
COM/Sampled Common output terminal.
4. Attach the other wire from the GCL to the amplifier’s
