Figure 1-34. Bench
Test Set-Up for Frequency Response
Test and Calibration
Vibration Table Setting With Ambient
Temperature at 75 50F
1400B (W. M. Welch,
Chicago, Ill.) (or equal)
Bell Jar 6-1/2 x 11 in.
95460 (Corning Glass,
Corning, N. Y.) (or equal)
V-10 (General Radio Co.
130V, 60 cycle
*Not required for Type 4-118-0107.
Button Setting Plug
(2) Connect a 130V, 60 cycle, variable trans-
former to Knockdown Coil Part No. 28024-AE-8.
The velocity vibration transducer assembly
Knockdown Coil, AC
put, and within 5 seconds manually pass the knock-
down coil over the velocity vibration transducer as-
s e m b l y until it is totally enclosed. Remove the
knockdown coil and again note the output voltage.
Required for Overhaul of the Vibration
Transducer Type 4-118-0107
ever the knockdown coil is in the vicinity of the
velocity vibration transducer assembly.