AMERITECH AM5 Instruction Manual page 41

AM5(e) Classic Instruction Manual
4.6.3 Calibration Procedure: This procedure may be performed at any time to bring
up the calibration function. If power has just been turned on, the display at step
4 will already have appeared.
1. Press the SEND key until QUIET is lighted.
2. (df) Press the DISPLAY key so that SEND is lighted.
3. Press PARAM SEL/ETR key repeatedly
to step through the QUIET parameter
list. Stop at the Version display.
4. Hold the START/STOP key (adjacent to
IMP NOISE RUNNING LED) for more
than one (1) second until the full
calibration prompt is displayed.
5. To skip the calibration, press SEND key (QUIET will remain lighted).
or
To go into the full calibration mode of
operation, press the
Selections will go to the defaults, the
1004Hz LED (and tone) will come on, and the display will prompt for the
high calibration (V1).
6. Check the reading on the external voltmeter. The 1.900 display represents
the expected AC RMS value, the actual reading on the voltmeter varies
from unit to unit. If the display is greater than 1.900, turn the power OFF
and restart calibration.
7. Use the and
voltage measured by the voltmeter. This voltage should be larger than 1.200
and smaller than 2.200. If the voltage is outside of these limits, the unit
must be repaired.
8. When the display matches the voltmeter
reading, press
reading and to display the prompt for
low calibration (V2). (The level of the tone will drop).
9. As with V1, the 0.350 represents an expected value. Use the
change the displayed value to agree with the voltage measured by the
voltmeter. This voltage should be larger than 0.250 and smaller than 0.450.
If the voltage is outside of these limits, the unit must be repaired.
However, if the display is greater than 0.350, turn the power OFF and
restart the calibration.
November 19, 1997
(18-0047)
key.
keys to change the displayed value to agree with the
key to accept the
Page 4-8
SELF TEST and CALIBRATION
(VErsion) (101A – typical)
(Calibration?)
(Full)
and keys to