Echometer Company
Model – M Manual
Phone: (940) 767-4334
5001 Ditto Lane
Page
8
Fax: (940) 723-7507
Wichita Falls, Texas 76302, U.S.A.
E-Mail:Instrument Panel
The instrument panel is shown schematically in Figure 2 in the appendix. The following controls are used for
operating the instrument and for checking that it is operating correctly:
•
Power Switch:
Momentarily placing the switch in the ON position energizes the amplifier, activates a red light that indicates
that the battery is powering the electronics and records a header on the strip chart. The microprocessor
performs a system test and checks the battery voltage. If the battery voltage is low, a message is printed to
charge the battery. If the system is OK, the chart drive stops after printing the battery voltage and test signals
on the collar and liquid level channels, and the message " TURN ON CHART DRIVE TO TEST WELL".
The power can be turned off manually, or the power will automatically turn off after approximately 15 minutes
of non-use.
•
Upper Collars/Lower Collars Switch:
This two-position switch selects whether the collar channel is connected to the high frequency (Upper Collars)
or medium frequency (Lower Collars) filter circuits.
•
Collars Gain
This knob controls the gain of the collar channel. The most counter-clockwise position (AUTO) activates
automatic gain setting and should be used first always. In the AUTO mode, the gain is set automatically.
Having the gain indicator on a value greater than 1 when the chart drive is turned on allows the operator to
control the amplifier gain by setting the gain control knob as desired before the “shot” is detected. After the
“shot” is detected, the instrument uses the gain setting when the shot is detected and the operator cannot adjust
the gain.
•
Liquid Level Gain
This knob controls the gain of the liquid level channel. The most counter-clockwise position (AUTO)
activates automatic gain setting and should be used first always. In the AUTO mode, the gain is set
automatically. Having the gain indicator on a value greater than 1 when the chart drive is turned on allows the
operator to control the amplifier gain by setting the gain control knob as desired before the “shot” is detected.
After the “shot” is detected, the instrument uses the gain setting when the shot is detected and the operator
cannot adjust the knob.
•
Chart Drive Switch
This switch is used to turn on and off the chart drive. Turning the switch to ON begins the data acquisition
sequence. This consists of printing the data forms followed by the gain settings and the noise level on both
channels, followed by the statement GENERATE PULSE and the recording of the two channels. The chart
drive continues on until the switch is turned OFF.
•
Input Connector
This BNC INPUT connector is the input to the amplifiers. When acquiring data, this INPUT connector must
be connected to the microphone connector on the acoustic wellhead using a good coaxial cable with clean
connectors.
•
Remote Fire Connector
Connects the instrument to the solenoid valve of a remote fire gas gun if a remote fire gun is utilized.
•
Remote Fire Switch
Depressing
this switch operates the solenoid valve on a remote fired gas gun by applying 12 volts to the
solenoid coil. Depress the switch for 1 second to fully release gas from the chamber.