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TM 11-6625-1589-15-1
SECTION V
MAINTENANCE
5-1 .
INTRODUCTION .
5-2 .
This section contains information necessary for the maintenance of the Model
204C Oscillator .
Included are performance checks , adjustment and calibration
procedures ,
and troubleshooting procedures .
5-3 .
The test equipment needed to properly maintain and service the Model 204C
is listed in Table 5-1 .
If the recommended model is not available ,
other equipments
may be substituted provided they meet the required specifications.
PERFORMANCE CHECKS.
5-5 .
The performance checks presented in this section are designed to compare
the
Model 204C with
its published specifications.
These checks can be used for
incoming inspection ,
periodic
maintenance checks ,
and to verify
performance
after adjustment or repair .
DIAL ACCURACY CHECK.
Connect the Model 204C and the Frequency Counter as shown in Figure 5-1 .
Set the counter to measure frequency and check the Model 204C at the
frequencies listed in Table 5-2 for the tolerances indicated .
Table 5-2 .
Dial Accuracy Check
RANGE SWITCH
COUNTER INDICATION
1
6
12
1
6
12
1
6
12
1
6
12
1
6
12
1
6
12
+0.15 Hz
30 Hz
+0.9 Hz
60 HZ
+1.8 HZ
10 Hz
+0.3 HZ
60 Hz
+1.8 Hz
120 Hz
+3.6 Hz
100 HZ
+ 3.0 Hz
600 HZ
+18.0 Hz
1.2 kHz
+36 Hz
1.0 kHz
+ 30 Hz
6. O kHz
+180 Hz
12. O kHz
+ 360 Hz
10.0 kHz
+ 300 Hz
60.0 kHz +1.8 kHz
120.0 kHz + 3.6 kHz
100.0 kHz
3.0 kHz
600.0 kHz +18.0 kHz
1.2 MHZ
+36.0 kHz
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