artisan 8640B - Internal Reference Frequency Adjustment Test Setup

Model 8640B TM 9-4935-601-14-7&P
ADJUSTMENTS
5-41. INTERNAL REFERENCE FREQUENCY ADJUSTMENT (Cont'd)
Figure 5-10. Internal Reference Frequency Adjustment Test Setup
EQUIPMENT
Frequency Counter.................................................................................. HP 5327C OPT H49
Oscilloscope....................................................................................... HP 180A/1801A/1820C
PROCEDURE:
1 .Remove trim strip that holds front panel window in place. Gently pull window up and out and remove it. Allow
generator to warm up for 2 hours.
2. Connect equipment as shown in Figure 5-10 after setting Signal Generator's controls as follows:
TIME BASE REF INT/EXT (on rear panel) ...................................................................... INT
TIME BASE VERNIER.................................................................................................... CAL
3. Set oscilloscope's vertical sensitivity to 0.05 V/div (ac) and horizontal scale for external ac. Set magnifier for X
10 and adjust oscilloscope's controls for a Lissajous figure.
4 Adjust time base adjustment pot (available through the hole in the front of the counter casting) for a stable 2:1
Lissajous figure (it will look approximately like a figure eight on its side).
5 Replace front panel window and trim strip.
5-35
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