410 Alex Goodman 
SAY STABILITY ARO CONTROL DATA SHEET 
pRac-TR. .13 (2-58) SHEET No, 23 
ENGINEERS) Young-Schwarting MOTESStrip tests top rudder ‘and prop. off 
Sens 5:1 all cares except ¥'s 
0000 0000 0000 0000 
-0203 -0021 0016|-0070 
-0212 0232 -0058 -0084 
-0213 0482 -0120 -0088 
-0207 -0012 0019 -0066 
-0195 -0295 0110 -0056 
-0187 -0536 0158 -0032 
-0190 -0793 0173 -0008 
-0188 -1041 0155 -0019 
-0200 -1060# 0061 0062 
* after nO means hit limit 
-0212 -0060 0111 -0063 0011 -000 
=0216 0186 0045 -00/5 OOK -0001 
=0218 0427 -0004 -0085 0157 -0001 
-0214 -0057 0111 -0062 -0000 -0001 
-0200 -0335 0193 -0041 0056 -0002 
-0198 -0580 0243 -0014 0194 -0002 
0211 0014 -0061 -0066 
-0211 0268 -0139 -0073 
=0210 0520 -0196 -0075 
-0206 0018 -0062 -0057 
20194 -0254 0016 -0050 
0027 -0188 -0499 0059 -0026 
2026 
20: 
2028 
20 
20 
20 
20 
20 
20 
20 
20 
20 
2038 
20 
20 
20 
20 
20 
20 
Fig. 24. Typical data sheet for static and dynamic tests 
As mentioned earlier, the balance and sensitivity control box contains features that are 
provided for the purpose of maintaining accuracy and increasing versatility of the system. 
Among these features are the means of checking zero, adjusting and checking sensitivity, 
changing zero reference, and filtering to smooth out the data. 
A zero-check switch is provided to separate any change of reading due to causes other 
than actual gage displacement. These changes could be due to causes such as changes in 
value of circuit resistors or diodes. When the switch is closed, the primaries of two input 
transformers of the control circuit are connected in parallel so that their voltages must be 
equal regardless of gage core position. If the zero-check reading differs from the original 
value, the difference is due to changes in the control unit circuitry rather than the gage. 
Thus, the reading obtained on the digital indicator may be corrected by this amount. If the 
gage is not balanced at the time of testing due to preload or core offset, it is desirable to 
balance it directly. This is accomplished by a “gage zero” potentiometer which is adjusted 
to make the impedances across the two gage halves equal. 
The “pen position” adjustment is provided to set the initial reading of the digital indi- 
cator or recorder to any desired value while the model is at rest. The usual practice for 
steady-state tests is to adjust the digital indicator to read zero when there are no hydrody- 
namic loads on the system. The setting is periodically checked before each run or group of 
runs to maintain the zero. The advantages of this procedure are that it provides a means for 
