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Model8444A
08444-90005
CHANGE 1 (cont'd)
Pages 5-3 through 5-6, Paragraph 5-9 and Figure 5-2, change to read as follows:
5-9. 1.55 GHz Oscillator Power level, Frequency Check and Adjustment
REFERENCE: Service Sheet 3.
DESCRIPTION: The 1.55 GHz local oscillator is checked for power output level and frequency
tuning range. Oscillator frequency is determined primarily by the LO cavity, with tuning range
determined by the drive voltage from the oscillator driver. The oscillator is checked first for
power level and then for frequency and tuning range.
FREQUENCY COUNTER
POWER METER
DIGITAL VOLTMETER
CABLE ASSEMBLY
1~11
TEST LEADS
THERMISTOR MOUNT
Figure 5-2. 1.55 GHz LO Power Level and Frequency Check and Adjustment Test Setup
EQUIPMENT:
Power Meter with HP 84 78B Thermistor Mount . . . . . . . . . . . . . . .
HP 432A
Frequency Counter with HP 5254C Plug-in . . . . . . . . . . . . . . . . . . . HP5245L
Digital Voltmeter with HP 3443A Plug-in . . . . . . . . . . . . . . . . . . .
HP 3440A
Test Leads (dual banana plug to probe and alligator clip) . . . . . .
HP 11003A
Cable Assy, SMA male to BNC male. . . . . . . . . . . . . . . . . . . HP 08555-60076
Cable Assy, male BNC connectors . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A
Coaxial Attenuator, Option 010.. . . . . . . . . . . . . . . . . . . . . . . . . .
HP 8491A
Adapter BNC barrel (HP Part Number 1250-0080) . . . . . . . . . . . UG 914A/U
Adapter (BNC to Type N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UG 201A/U
PROCEDURE:
1.
Perform Power Supply Check and Adjustment, paragraph 5-8.
2.
Apply power to Tracking Generator and allow 1 hour for instrument to warm up and stabilize.
3.
Disconnect Cable W8 at Isolator AT3 J2 (see Figures 8-4 and 8-12).
4.
With test setup as indicated in Figure 5-2, connect Power Meter to Isolator AT3 J2 via 08555-60076
cable, 10 dB attenuator and UG 914A/U adapter.
5.
Rotate TRACK ADJ control throughout its tuning range while noting power level indicated on Power
Meter.
6.
Minimum power output must be greater than +5 dBm.
>+5dBm _ _
7.
Connect Frequency Counter to Isolator AT3 J2 via 08555-60076 cable, UG 914A/U adapter and BNC
to BNC cable.
2
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