Larson Davis Spartan 821 - 2.1 Assembling Your Meter

Spartan 821/721 Manual Assembling Your Meter 9
2.1 Assembling Your Meter
The meter is designed with a removable preamplifier and microphone. This allows you to
remove and store these accessories in protective cases for transport or when not in use.
In this section:
• 2.1.1 Connecting the Preamplifier and Microphone
• 2.1.2 Connecting or Disconnecting the Preamplifier From the Meter
2.1.1 Connecting the Preamplifier and Microphone
CAUTION Do not handle the microphone and preamplifier without observing the
following cautions:
• Avoid static discharge to the pogo pin (e.g. ground yourself)
• Do not use excessive force
• Gripping tightly or screwing threads tightly is unnecessary
• Do not remove the microphone grid cap and expose the diaphragm
• Do not allow dust or debris to collect in preamplifier or microphone
FIGURE 2-1 Microphone and Preamplifier Threaded Assembly
2.1.2 Connecting or Disconnecting the Preamplifier From the Meter
To Connect the Preamplifier:
The preamplifier is marked to enable correct alignment when connecting to the meter.
Observe each step of the following process to prevent unnecessary damage.
CAUTION Do not attempt to screw the preamplifier into the meter’s preamplifier
housing.
The preamplifier and 1/2-inch microphone screw
together.
The microphone should seat smoothly
against the preamplifier.
Lightly grip the microphone (not the grid cap) and
gently unscrew and separate the threaded assembly.