A1
Pin #
Function
Description
Signal
Type
Level when
Asserted
Level when
Deasserted
Notes
Applications
1
Amplifier
Output
Used for driving
Follower amplifiers;
monitoring amplifier
output voltage
AC or
DC
Can be great
-
er than ±200V
peak
0V
Used for monitoring amplifier output
voltage; driving Follower amplifiers
in multi-amp systems. Wired to am-
plifier output. Do not connect to any
impedance of less than 10K ohm.
Voltage Monitoring:
Connect a voltage meter to mon
-
itor the output voltage being produced by the amplifier.
Connect across PIN 1 (Amp Out) and PIN 10 (Sampled
Common).
2
Sampled
Common
Load connected
here for Current
sense
AC or
DC
Up to ±2V
peak relative
to Common
0V
Used for driving Follower amplifiers
in multi-amp systems, controlled
voltage or controlled current mode.
Driving Follower Amplifiers:
Amplifier External Refer
-
ence, 2V peak maximum from PIN 14 (Common).
3
+1 IN
Differential Follower
input
AC or
DC
Can be great
-
er than ±200V
peak
0V
Only used in multiple amplifier
configurations - Series mode.
Can accept output of PIN 1 (Amplifier Output) OR PIN
2 (Sampled Common) from Master device when in
Follower mode.
4
Interlock
Amplifier Interlock
input
DC
0V to 8V
10V to 15V
When “low”, forces to Standby;
when allowed to float, allows Run
(if amplifier is “Ready”). IMPORT
-
ANT: amplifiers must be configured
for Run mode at startup (factory
default) or the Run button must be
pressed at the amplifier front panel
at startup.
Remote to Standby:
Short PIN 4 of amplifier to Digital
Ground (PIN 17) using dry contact switch or optocoupler.
When closed, places amplifier in Standby.
Multi-amplifier Systems, Simultaneous Enable or
Disable of amplifiers:
Daisy-chain Interlock (PIN4)
across amps (if sharing the same Sampled Common
power connections). Optocoupler must be used for multi-
amps in series.
5
Amp Ready
Ready output of
amplifier
DC
0V
–14V
Normally reserved for OPTOC
use; not recommended for normal
customer use. Line has series
resistor and unloaded will go from
0V (not ready) to -15V (ready), with
an OPTOC BNC card the signal will
go from 0V (not ready) to -1.2Vdc
(ready)
Not recommended for normal customer use.
6
I MON +
Differential Current
M
AC or
DC
7212/7224/
7226:
5A/V
7548/7794/
7796/7796HC:
20A/V
Output current produced per volt
-
age detect.
Current Monitoring:
Connect a voltage meter to mon
-
itor the output current being produced by the amplifier.
For unbalanced, for each 1V detected, current output is
5A (7212/7224/7226) or 20A (7548/7794/7796/7796HC).
7
None
No connection
Not currently used.
8
None
No connection
Not currently used.
9
Blanking input Blanking control
DC
0 - 1Vdc
allows normal
operation
3.5 - 5Vdc
output is
muted
Used in amplifiers with blanking
feature included for blanking
control.
Blanking Control:
Use an external isolated 5V power
supply to mute the output of the amplifier.
Appendix A: SIM - Interlock I/O Connector Pinouts and Functions
Summary of Contents for 7548
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