TeleCorder # TCwL-B4, V2.43, Revision 4, USA 9
pauses may not be long enough to separate individual recordings using VAR for start/stop. If a recording
reaches the maximum length of time that you select for VAR Time Out, that recording will end, and a new
recording on that channel will begin. Click the Write Hardware button to confirm any changes.
3.6.5 Save VAR and Outgoing Calls Less than 8s or Outgoing Calls with Less than 3DTMF Codes:
Click on this option to place a check mark in its box if you want to save recordings that are less than 8
seconds long. If this box is not checked, VAR recordings shorter than 8 seconds, and outgoing telephone
calls with less than 3 DTMF digits, will not be saved.
This setting is normally used if external noise causes frequent and unwanted false audio activated
recordings. It is normalto record all activity on the monitored circuits. Use carewhen setting to delete short
recordings. This setting can only be changed from the PC.
3.6.6 Hardware Information: Clickon this box to show information aboutyour TeleCorder: hardware
version, model type, number of calls recorded, number of calls deleted, total length of all recordings (in
hours, minutes and seconds), total length of deleted recordings, and percentage of storage space used.
Information displayed is only for files shown on the list of recorded calls shown on the PC.
3.6.7 Date/Time Setting and Calibrating Time Keeping Accuracy: Your Recorder has an internal
real-time-clock (RTC) that can be set to your local date and time by the TeleCorder program running on
your PC.
To set the date/time to the date/time from your PC, click on the
Date/Time Setting button and select YES by clicking on the Copy the
date/time setting from PC to TC device? button.
Time keeping accuracy is determined by operating temperature and quartz crystal accuracy. If the
RTC clock is not as accurate as expected, recorders with hardware version 4.06 can be calibrated for higher
accuracy using the Reflash Utility (V1.55) that was installed onto your PC (see Section 2.5 and 4.1 of this
manual). Changes to the RTC calibration numbers should be done carefully after observing if the clock is
gaining or losing time over many days. Changing the calibration numbers after monitoring accuracy for a
period less than a minimum of one or two days will not produce accurate results.
With the recorder connected to your PC via USB, open the TC Reflash Utility (V1.55). Note the
settings for RTC Calibration on TcVcom Devices and RTC Base Freq on TcVcom as shown in
the image below.
Calibration of the clock is accomplished by changing the numbers in the boxes shown as “0” and
“32768” in the above image. You must close TeleCorder software prior to using the Reflash Utility.
RTC Calibration on TcVcom Devices can be set to any number between 0 and 127. Each
increment will fine tune the RTC calibration slower by approximately ½ second per week. A lower number
will speed up the clock over a period of days and a higher number will slow down the clock.
RTC Base Freq on TcVcom can be set between 32665 and 32771. This is a course setting: each
increment changed to a lower number will force the clock to run faster by approximately 2.6 seconds per
day. Going to the next higher number will force the clock to run slower by approximately 2.6 seconds per
day. For example, changing two increments by going from 32768 to 32770 would cause the clock to run
about 5 seconds slower per day. Changing from 32768 to 32767 would cause the clock to run faster by
approximately 2.6 seconds per day. Calibration is periodic, not constant — check for improvement in RTC
accuracy after a few days. Checking after only a few hours will not provide accurate readings.
When finished, be sure to click on the Change Device Settings as Wanted
button. To lock the new settings into memory, power must be cycled (power the
recorder down by disconnecting power and re-connecting after a few seconds). Re-
sync time to the PC and confirm the improvement in accuracy after a few days.
Fine tune the calibration settings as necessary.
