Overview

A change of internal 824 memory may cause the message ‘Analog Cal Bad’ to appear. 

Features
824 Maintains factory calibration offsets in flash ROM

The ‘analog cal bad’ can usually be field reprogrammed in the model 824.

• Internal to the 824 are stored values in EEPROM memory to digitally correct any slight calibration offset errors (typically less than 0.2dB) in the SLM ISM option for the full 110dB dynamic range.
• If the stored values no longer match the checksum, the 'Analog Cal Bad’ message is displayed.
• Call the factory Technical Support 888-258-3222 in the US or, 716-926-8243 international, with your 824 serial number to receive the necessary calibration file by email.

Email Download Example:  Attached are the original offset values for 824 snxxxx to reprogram:

1) Copy the attached file .CBK to your 824Util (v 3.12) software folder on your PC.

2) Run 824Util and connect to the 824

3) In 824Util Select File, Upgrade, Firmware/Options

4) Browse and click on the 824axxxx.cbk

5) Check on Apply Firmware, Press Start

6) After completion of reprogramming, do a microphone SPL calibration, and then store to EEPROM using TOOLS, MEMORY, Create EEPROM Backup.

The contents of a calibration file .CBK for model 824 sn 3104 is :

Dump of Cal Block for 824:A3104

Version: 5

CalOffset: -47.0781

Bias_OS: -0.0039

TEMPOFFSET: 58.0586

HighDynRangeOS: -0.3004

ChanWghtOS: -0.2500