Figure 4-11. Strobex Test Points and Adjustments

TM-55-4920-402-13P VIBREX Balancing Kit Manual
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Figure 4-11. TM 55-4920-402-13&P d. Oscillator Frequency Test. (1) Disconnect frequency/period counter and function generator, (2) Connect oscilloscope to TP10 (Fig. 4-11). Set up oscilloscope to sync on EX 60 Hz source and to measure a 400-volt signal with a 2 ms/division time base. (3) Set RPM dial MODE switch to positions in- dicated in Table 4-9. At each setting, adjust RPM dial to sync oscilloscope. Verify that RPM dial indicates value listed in Table 4-9 after syncing. e. Testing of Locking Oscillator. (1) Connect Strobex and test equipment as shown in Figure 4-10. (2) Connect oscilloscope to function generator and set up oscilloscope to trigger from positive edge of function generator output. NOTE Sync may be found at more than one point at each setting. RPM dial MODE switch Synced RPM dial 180 D 171 to 189 360 D 342 to 378 540 D 513 to 567 720 D 684 to 756 900 D 855 to 945 720 C 684 to 756 720 B 684 to 756 Table 4-9. Strobex Oscillator Frequency Check Change 4 4-10.3

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