Table of Contents
Advertisement
To summarize, the operating steps are:
a) Wire a variable autotransformer in the line supplying power to the
Exciter Body.
b) Set amplifier controls:
CURRENT LIMIT and
HEAD CONSTANT as required by the new operating voltage
EXCITER INTERLOCK: "Bypass" position
c) Turn amplifier POWER switch to "On". Adjust (as necessary) the
variable autotransformer for the desired mains voltage to the exciter.
d) Ensure that the cooling fan is working in the Exciter Body and then
proceed as for normal operation.
3.9.
EXCITER TRIGGER
The shorting-link between pins 1 and 2 of the ACCESSORY socket can
be replaced by an external normally-closed pair of relay or switch contacts.
When the contacts are opened the amplifier EXCITER protection circuitry
will be triggered. The contacts could be controlled by a temperature over-
load thermostat of an environmental test chamber, a failure on the test
specimen, etc.
29
Advertisement
Table of Contents
