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8500 Series Push/Pull DB9 Cable Kit (part num-
ber 69-8005462)
8504 Parallel DB9 Wiring Kit, 2 Amplifiers (part
number 69-8005463)
8504 Parallel DB9 Wiring Kit, 3 Amplifiers (part
number 69-8005541)
8504 Parallel DB9 Wiring Kit, 4 Amplifiers (part
number 69-8005542)
8504 Parallel DB9 Wiring Kit, 5 Amplifiers (part
number 69-8005543)
For installation instructions, refer to the topic "Mul-
tiamp Systems for Increased Current."
6.2 Emergency Stop Switch or Safety
Interlock
The two 9-pin D-Sub connectors on the amplifier
back panel (Interlock A and Interlock B) can be
used to remotely place the amplifier in Standby
mode. This can provide a valuable safety feature,
such as in creating a safety interlock for a cabinet
in which one or more 8504 amplifiers are installed
or wiring an emergency stop switch to the cabinet
front or another accessible location.
The Remote Standby functions the same as the
amplifier's front power switch by placing the ampli-
fier in Standby mode. When an 8504 amplifier is in
Standby mode, the low-voltage transformer is en-
ergized but the high-voltage transformers are not.
By using a Remote Standby switch, all amplifiers
in a multi-amp system can quickly and reliably be
placed in Standby mode simultaneously. A Remote
Standby switch also eliminates mechanical wear
on the amplifier's front panel power switch.
Figure 6.4 – Using the Interlock A or Interlock B
connector to wire a safety interlock switch
24
To use this function, wire a switch using PIn1
(Interlock) and either Pin 3 or Pin 6 (Ground), as
shown in Figure 6.4. Note that either the Interlock
A connector or the Interlock B connector can be
used.
In multi-amp systems, the unused Interlock A
connector on the Master amplifier or the unused
Interlock B connector on the last Follower amplifier
can be used to wire the safety interlock.
6.3 Controlled-Voltage vs. Controlled-
AE Techron 8504 amplifiers can be field-configured
to operate as Voltage Amplifiers (Voltage-Con-
trolled Voltage Source) or as Transconductance
Amplifiers (Voltage-Controlled Current Source).
The mode selection is made via the back-panel
DIP switch #4. See the Advanced Configuration
section for more information.
When configured as a Controlled-Voltage source
(voltage amplifier), the amplifier will provide an
output voltage that is constant and proportional
to the control (input) voltage. If the load's imped-
ance changes, the amplifier will seek to maintain
this ratio of input to output voltage by increasing or
decreasing the current it produces, as long as it is
within the amplifier's ability to create the required
current. Use this mode if you want the output volt-
age waveform to be like the input waveform (see
Figure 6.5).
Conversely, when configured as a Controlled-
Current source (transconductance amplifier), the
amplifier will provide an output current that is con-
stant and proportional to the control (input) volt-
age. If the load's impedance changes, the amplifier
will seek to maintain this transconductance (ratio
of input voltage to output current) by increasing or
decreasing the voltage it produces, as long as it is
within the amplifier's ability to create the required
voltage. Use this mode if you want the output cur-
rent waveform to be like the input waveform (see
Figure 6.6).
Information subject to change
8504 OPERATOR'S MANUAL – SECTION 6
Current Modes of Operation
96-8005353_8-12-2020
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