Crown Audio IQ-SLM8 - Manual (Page 11)

Page 11
IQ–SLM-8 System and Load Monitoring IQ System Component
Reference Manual
Frequency: Test only the frequency response of the
channel.
Imp/Freq: Test both the impedance response and
frequency response of the channel.
Reference: Measure the reference impedance and
frequency response for the channel.
Start (Hz): Sets both the beginning frequency of a test
and the beginning frequency of the returning data.
Stop (Hz): Sets both the ending frequency of a test and
the ending frequency of the returning data.
Test Impedance Tolerance: Sets the criteria by which
impedance test data will be evaluated to determine if
the load should pass or fail a test. It simply compares
the impedance test data to the reference impedance
data to see how much they differ. If the difference is
greater than the Impedance Tolerance setting, the load
has failed the test. The range is ±1% to ±100%. Be
careful not to set the tolerance too tightly. Allow for the
normal variations in your system.
Test Frequency Tolerance: Sets the criteria by which
frequency test data will be evaluated to determine if the
output should pass or fail a test. It simply compares the
frequency test data to the reference frequency data to
see how much they differ. If the difference is greater
than the Frequency Tolerance setting, the output has
failed the test. The range is ±1 dB to ±25 dB. Be careful
not to set the tolerance too tightly. Allow for the normal
variations in your system.
A failed impedance test usually indicates that there is
something wrong with the load or its wiring. A failed
frequency test usually indicates a problem in the elec-
tronics between the points where the test signal is
inserted and the measurement is made.
3.3 Fused Loudspeaker Monitor
A fused loudspeaker monitor output is provided. Con-
nect a monitor loudspeaker to it and you can audibly
monitor the signal of any channel. It is capable of
driving the monitor loudspeaker with up to 10 watts of
power. The fuses protect both the output and the moni-
tor loudspeaker from too much power.
The monitor output is switched by a DPST (break-
before-make) relay and it requires an
IQ System for
control. When the monitor channel selection is
changed, the IQ software will first turn off the monitor
outputs of all other
SLM-8s in the IQ System and then
switch on the selected channel of the selected SLM-8.
In this way, you can safely connect the monitor loud-
speaker outputs of multiple
SLM-8s to the same moni-
tor bus without fear of their being shorted together.
3.4 Stand-alone Operation
Stand-alone operation is possible after the unit has
been configured. Sixteen two-color LEDs quickly dis-
play the individual pass/fail status for each test (im-
pedance and frequency response) for each channel.
Note: Stand-alone operation requires that the AUX in-
put be used to manually trigger tests. See Sections
4.8.1 and 4.9 for additional details.
3.5 Local Memory
Local EEPROM memory provides secure, nonvolatile
storage of all measurements and settings. This means
that the generator settings and test data will not be lost
when power is removed from the unit.
3.6 Synchronous Operation
Multiple units can be configured for synchronous op-
eration where they share a common test signal. This
requires that several parameters be set to the same
value in each
SLM-8. See Sections 3.1, 4.8.1 and 4.10.
3.7 Data Indicator
A Data indicator is provided on the front panel to show
when the unit receives a data signal from the
IQ Sys-
tem. The Data indicator can be forced to stay on to
serve as a troubleshooting aid for Crown Bus commu-
nication.
Note: The Data indicator is similar to the DSPI
(Data Signal Presence Indicator) LED on other IQ com-
ponents.
3.8 Power Indicator
A Power indicator is provided on the front panel to
show when the unit has power.
3.9 AUX Port
A standard IQ AUX port is provided with both input and
output capability. The output can be used to signal a
failed test. When used in this mode, it uses reverse
logic (high = pass; low = fail) so the unit will not give a
false pass signal when it is has no power. The AUX
output can also be used to signal or switch external
equipment like other IQ AUX ports.
The AUX input can be used to manually trigger a test.
This is required when the unit is used in stand-alone
mode. See Sections 4.8.1 and 4.10.
3.10 “No-Fault” Warranty
A three year “No-Fault” full warranty is provided to
guarantee the specifications and protect your invest-
ment.