Frequently Asked Questions

CBL170 Auxiliary Connection cable

Cable connecting the Model 831 sound level meter to serial connector and coaxial DC connector (to PSA027). Serial connector: wind speed and direction, logic I/O, 2 slow ADC.

The CBL170 consists of 3 parts:

The high density connector (Hirose 18-pin) goes into the Model 831.

The power is supplied via the coaxial DC connector (2.5 mm), eg with PSA027.

Female DB9 provide the following signals:

• 12V power
• Logic In
• Logic Out
• Wind speed / tach
• 3 A/D channels (wind direction, temperature, humidity)
• Control GND
• Power GND

The cable with male DB9 and pigtails and male DB9 breakout board with screw terminals are there for convenience.

Use examples:

 => Logic Out – Connect to relay with alarm light

 => Wind speed – as tach input (1 reading / second)

 => Wind speed / direction

Using Logic In:

The logic-in is not latching and is sampled by the microprocessor so for the trigger to be reliably detected, the pulse needs to remain high until sampled; at least 100ms.

The Model 831 includes the circuitry below for signal conditioning: