HP 5340A Operating And Service Manual page 111

Model 5340A
Maintenance and Service
8.
a. Set 5340A RANGE switch to 10 Hz to 18 GHz and the RESOLUTION switch to 100 Hz.
b. Connect 608 Signal Generator to 50R Type N INPUT. Set generator to 280 MHz at -20 dBm.
c. Set A13R31 fully counterclockwise.
d. Measure voltage at XA4(8) (QUAD DET) and set A13R31 for -450 mV
e. Disconnect 280 MHz signal and connect 20 GHz at 0 dBm and observe a stable display. If the display is
unstable, adjust A7R27 (GAIN) counterclockwise for a stable display. If this adjustment is made, it is
necessary to readjust the input loop. Repeat step 7.
OSCILLATOR ADJUSTMENT
9.
Connect 53 OSC output, available on the 5340A rear panel to the input of a high resolution frequency
a.
counter such
as a
to the external oscillator input of the 5360A.
b. Remove the A18 05340-60036 Oscillator board from the 5340A and note the frequency marked on the
label. Reinstall the board.
Remove the screw covering the frequency adjustment.
c.
d. Use a n insulated tuning tool to adjust the oscillator for a 5360A display of the frequency noted in step b.
10. OSCILLATOR ADJUSTMENT
The 5340A must have primary power applied for at least 24 hours to allow the
oscillator temperature to stabilize.
a. Set controls on oscilloscope as follows:
CHANNEL A 0.2 V/cm; DC coupled + up
SWEEP 0.05 psec/cm
TRIGGER; EXT,
MODE to NORM
DISPLAY to CHANNEL A
b. Connect a suitable 1 MHz, 5 MHz or 10 MHz frequency standard (such as a n HP Cesium Beam) to the
EXT Input on oscilloscope.
Connect Oscilloscope Channel A to 10 MHz output (53) available on 5340A rear panel.
c.
d. Adjust oscillator FREQUENCY ADJ for minimum sideways movement of the oscillator signal.
5-10
Figure 5-2. Adjustment Procedures (Continued)
-
STANDARD OSCILLATOR
suitable external frequency standard (such as H P 5061 Cesium Beam)
a
-
OPTION 001
+ slope, ACF
10 mV.
NOTE