Operation
3-3
Cable Connections
Signal Input Cable
Caution:Be sure that all connections
in the signal path are made prior to
turning on the system power.
Connect the microphone preamplifier cable to the 7-pin
LEMO connector on the front of the case. The length of the
cable will affect the frequency response of the system as
indicated in the section “Cable Driving Capability” on
page A-3.
To remove the cable, hold the connector collar between the
thumb and forefinger and pull.
AC Signal Output Cable
Connect the signal output cable to the BNC connector on the
front of the case.
Operation
Switch On
The power switch is on the left side of the case. Toggle it
backward to switch on the Model 2221 and forward to
switch it off. The Microphone Bias Voltage LED flashes for
40 seconds while the bias voltage stabilizes.
Parameter Selection
The measurement parameter settings of the Model 2221 are
saved two seconds after the last change, even when not
powered. Therefore, when switched on all measurement
parameters will be the same as when it was switched off.