Appendix
U511 User’s Manual
G-10 Aerotech, Inc. Version 1.1
G.6. Adjusting the Gain on the RDP Board
Once a resolver or Inductosyn is connected to the RDP board, the user must verify that a
sinusoidal signal is being sent from the feedback device and adjust the amplitude, if
necessary. The signals can be monitored from the test points listed in Table G-11.
Table G-11. RDP Board Test Points
Test Points Axis # Sine/Cosine Signal
TP17 4 COS
TP18 3 COS
TP19 2 COS
TP20 1 COS
TP21 1 SIN
TP22 2 SIN
TP23 3 SIN
TP24 4 SIN
TP4 - Ground
To verify that a sinusoid signal is being received from the axis with a resolver or
Inductosyn, perform the following steps.
1. Connect an oscilloscope (O-scope) to the COS signal of the axis being tested and
connect the ground of the O-scope to TP4. Move the resolver or Inductosyn; a COS
signal (sinusoid) should be observed on the O-scope.
2. Connect the O-scope to the SIN signal of the axis being tested. Move the resolver or
Inductosyn again verifying that a SIN signal (sinusoid) is seen on the O-scope.
3. Verify that the amplitude of the sinusoidal signal of the axis being tested is within
specifications. Connect an O-scope to either the SIN or COS signal and connect the
ground lead to TP4. Move the resolver or Inductosyn and observe the amplitude
increase and decrease.
4. Notice that when the COS signal’s amplitude is at maximum, the SIN signal’s
amplitude is at minimum and vice-versa.
5. Stop moving the resolver or Inductosyn when the amplitude of the sinusoid is at its
maximum.
6. The maximum should be 2 V RMS, which is ≈2.8284 V peak or ≈5.6568 V peak to
peak.
7. If it is not 2 volts RMS, then adjust the R2 potentiometer until it is.
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