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AM5(e) Classic Instruction Manual
9.
Press MEASURE key until S/N RATIO is lighted.
•
Green HOLD TONE LED will be lighted beside left display.
•
Left display will read greater than 50.0 or "oVEr" with dB lighted (this
indicates a very quiet "line").
•
Right display will read 1.004 ±.002 with kHz lighted.
10. Disconnect test connections from TX/2W to RX. Turn off power then turn it
back on to re-establish the default settings.
NOTE: If a problem is found in any of the checkouts or the Calibration Procedure
contact Ameritec Customer service. See Section 11, Warranty.
4.6
CALIBRATION PROCEDURE
The AM5(e) Classic was calibrated at the Factory for proper measurement accuracy by
loading preset values into its internal RAM. RAM is maintained by a small internal
battery.
During the power-on self-test, the unit will automatically diagnose itself and, if
necessary, provide a display to inform the operator of the need for recalibration.
4.6.1 External Test Equipment: A high-accuracy digital voltmeter must be used to
calibrate the AM5(e) Classic. The voltmeter must measure AC volts RMS, and be
accurate at 1000 Hz within .4%. Minimum
input impedance of the voltmeter should be
200 kΩ..
A test cable such as the 48-0062 (Refer to
Section 5) may be used to connect the voltmeter leads to the front panel jack.
4.6.2 Calibration Setup
1. Disconnect all self-test or other input or output connections at the AM5(e)
front panel or at the rear panel.
2.
Connect leads of the volmeter to RX Jack at the front panel (using test cable)
or make the connection at the T1 and R1 terminals at the rear panel.
November 19, 1997
(18-0047)
SELF TEST and CALIBRATION
(Full)
Page 4-7
(Calibration?)
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