Extended Round Trip Delay
Convex Application Note


Extended Round Trip Delay is available for Convex 806A and 807A Transmission Test Sets. Extended Round Trip Delay overcomes the 12 millisecond ambiguity associated with the 83 Hz delay measurement. It measures round trip delay directly out to 1000 mS with .001 mS resolution.

EXTENDED ROUND TRIP DELAY is used to measure the input to output transmission time of a system. It is an absolute time measurement made at a single frequency - normally 1804 Hz. The test signal is first zeroed with the test set generator directly connected to the receiver. Then the signal is passed through the system under test and returned (round trip) to the test set. The test set displays delay in milliseconds

PROCEDURE - Extended Round Trip Delay (turn CTCSS off)

1. On the front panel, select the 15 kHz Filter and select DELAY Measurement Mode. Then press the MEAS Key for about one second until the DELAY LED blinks.

2. Connect test set SEND directly to the RECEIVE. When the display settles, ZERO the delay reading. Then wait for the zero reading to settle.

The test set can be rezeroed after being connected to the system provide delay is not subsequently reduced!

3. Connect the test set to the system under test and record the delay when the display settles.

NOTES: In extended mode, the instrument is setup to measure "positive" delay only. Therefore any reduction of delay after zeroing will be misinterpreted.

It can take 6 seconds for an Extended Round Trip Delay measurement to settle. The LED display blinks to indicate each new reading update.

HIGH RANGE / 3 Seconds. If the reading is greater than one second or does not settle to a steady value, press the UP Arrow to assert the high range. Note that the display blinking slows to about three seconds per update. With the slow update rate it can take 12 seconds for readings to settle. (Press the DOWN Arrow to return to the one second range.

Related Products:
Audio: Delay module - remote
Audio: Delay voice land lines
audio-equalizer-delay.htm

Last update 5/3/06.

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