Echometer Company Model – M Manual Phone: (940) 767-4334
5001 Ditto Lane Page 37 Fax: (940) 723-7507
Wichita Falls, Texas 76302, U.S.A. E-Mail: info@echometer.com
MICROPHONE CABLE TEST
On Model M Recorders having serial numbers above 5100, the microphone cable is tested in conjunction with the
microphone test as described on the next page. On Model M Recorders having a serial number below 5100, the microphone
cable can be tested using a special TEST circuit and TEST connector on the panel of the instrument. First, the Amplifier
and Filter Check should be performed to insure that the electronics, chart drive and printhead are performing properly.
Then, attach the microphone cable to the TEST connector and also to the INPUT connector. Turn the POWER switch ON.
Verify that the SYSTEM TEST is as shown on the Amplifier and Filters Check in the Appendix. Wait for the chart drive to
stop. Set the filter switch to UPPER COLLARS. Then, press the TEST button below the TEST connector. Next, set the
filter switch to LOWER COLLARS. Then, press the TEST button again. The following records should be obtained
depending upon the position of the filter selector switch. The chart drive is turned ON automatically; therefore, the operator
should not turn ON the chart drive switch during this test. The positions of the gain control knobs do not affect this test.
Always keep the connectors clean and the cable in good condition. The microphone cable and connectors can be a source
of noise and cause faulty operation of the instrument.
Model M instruments having serial number greater than 5100 do not offer the microphone cable test.
UPPER
COLLAR
FILTER
TEST
LOWER
COLLAR
FILTER
TEST
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