Information subject to change
96-8005353_02-17-2022
8504 OPERATOR’S MANUAL – SECTION 6
24
Connect Your Output Cables
1.
Make sure both amplifiers are disconnected
from AC power.
2.
Remove the 3/8-inch nuts from the Output and
GND terminals on the Master amplifier and
from the Output terminal on the Follower ampli
-
fier.
3.
Connect the end of the black output cable
terminated with a 3/8-inch ring terminal to the
Master amplifier’s back-panel GND connector.
4.
Connect one leg of the red output cable (ter
-
minated with a 3/8-inch ring terminal) to the
Master amplifier’s back-panel Output connec
-
tor. Connect the other leg to the Follower am
-
plifier’s back-panel Output connector.
DO NOT
CONNECT TO A LOAD AT THIS TIME.
5.
Replace the 3/8-inch nuts on all output termi
-
nals.
IMPORTANT: Torque the nuts to 10
lbs./foot.
6.
Replace the output terminal covers on both
amplifiers and secure.
Amplifier Current Check
1. Connect an oscilloscope or other measur
-
ing device to the back panel BNC connectors
labeled IMON on both the Master and the Fol
-
lower amplifiers.
2. Turn down the level of your signal source.
3. Make sure both amplifier’s back panel breaker
switches are in the ON position, and then press
the Standby-Run switch on each of the ampli
-
fier’s front panels to energize the amplifiers.
4. Wait for the green RUN LED to illuminate on
the amplifier.
5. Adjust your signal source to input a 1-kHz sine
wave of 100 mV into the amplifier.
6. Measure the current being produced at the out
-
put of the IMON on each amplifier (1V = 20A).
Be sure to measure AC voltage at the IMON
port as an RMS value. Apart from switching
current, no significant current should be ob
-
served. Current output should be less than 2A
(0.1V on the IMON output).
Figure 6.10 – Critical output wire lengths for 8504 parallel systems
TWO 8504 AMPLIFIERS PARALLELED
(CRITICAL WIRE LENGTHS)
OUTPUT
LOAD
OUTPUT
AMP #1
MASTER
AMP #2
FOLLOWER
C
D
OUTPUT
GND
OUTPUT
GND
A
Ÿ
Both wires of length “A” should be of the same length ±1/4 inch.
Ÿ
Wire lengths “A” and “B” may or may not be of the same length.
Ÿ
The length of wire “C” is not critical.
Ÿ
The length of wire “D” is not critical.
Ÿ
For maximum current output, all wire lengths should be as short as is practical.
A
B
