Sperry Marine 4914-CA, Руководство по эксплуатации, установке и обслуживанию

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To verify the correct operation of an installed or re-installed gyrosphere,
the settling behaviour of the compass is to be observed, with the front
door of the compass housing opened.
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The value of the gyrosphere current is decreasing continuously and is a
key indicator for a successful gyrosphere settling at a given point of time
during the power-up function test.
The gyrosphere current value in the Service Setup 2 (code 610), indi-
cated at the CDU, is a reading value only and may deviate from the true
operating gyrosphere current value (measured true RMS).
The true operating value of the gyrosphere current can only be meas-
ured (true RMS) at the 1
Ω
gyro current test resistor (R103) on the mas-
ter PCB. All gyrosphere current details are commented within the
power-up function test.
⇒
Figure 5-1 on page 5-10 shows the location of the 1
Ω
gyro current
test resistor (R103).
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Risk of inadequate testing / test values
The usage of any voltmeter NOT true RMS for testing will falsify the test
results.
The usage of a multimeter true RMS is absolutely mandatory.
Newer use a voltmeter not true RMS for testing purposes.
kçíÉ For a present operating voltage of 100 VAC on the master PCB, 105 VAC
true RMS are necessary.
The setting of true RMS can be adjusted via the potentiometer on the
master PCB. For details see figure 5-3 on page 5-12.
kçíÉ The AC-voltage in mV across the test resistor (R103) equals the gyro-
sphere current in mA.