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CALIBRATION PROCESS
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TB-9-6625-2182-35 Signal Generator SG-1207/U (Hewlett-Packard Model 8642M) Manual
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RF Output

TB 9-6625-2182-35
NOTE
When indications specified in this procedure are not within
tolerance, perform the power supply check prior to making
adjustments.
a. Connect TI to autotransformer.
b. Connect autotransformer to a 115 V ac source and adjust autotransformer to 115 V ac.
c. Set TI POWER switch to ON and allow at least 30 minutes for to stabilize.
8. Line Stability
a. Performance Check
(1) Connect frequency counter input A to TI OUTPUT RF.
(2) Set up frequency counter to read frequency.
(3) Press TI pushbuttons as listed in (a) through (c) below:
(a) INSTR PRESET.
(b) ENTRY - AMPTD.
(c) DATA ­ 0 dBm.
(4) Record frequency counter indication.
(5) For each row in table 3, vary autotransformer voltage. Frequency counter will
indicate within limits specified in table 3 of the recorded value in (4) above.
Table 3. Line Stability
Frequency counter
Autotransformer
indication at 100 MHz
voltage
±(Hz)
indications
125 Vac
5
120 Vac
5
110 Vac
5
105 Vac
5
(6) Adjust autotransformer to 115 V ac.
b. Adjustments. No adjustments can be made.
9. Frequency Accuracy
a. Performance Check
(1) For each row in table 4, press TI ENTRY - FREQ pushbutton and enter DATA
frequency. Frequency counter will indicate within the limits specified.

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