HP 10811A, Operating & Service Manual

Page: 14 / 73

Model 10811A/B
6
SECTION II
INSTALLATION
2-1. INTRODUCTION
2-2. This section contains installation instructions for the 10811 A/B Quartz Crystal Oscillator. Also
included is information about initial inspection and damage claims, preparation for using the
oscillator, and packaging, storage and shipment.
2-3. INITIAL INSPECTION
2-4. Inspect the shipping container for damage. If the shipping container or cushioning material is
damaged, it should be kept until the contents of the shipment have been checked for
completeness and the oscillator has been checked mechanically and electrically. The contents of
the shipment should be as shown in
Figure 1-1 ; procedures for checking electrical performance
are given in Section IV. If the contents are incomplete or if there is mechanical damage or defect,
or if the oscillator does not pass the Performance Tests, notify the nearest Hewlett-Packard office.
If the shipping container is damaged, or the cushioning material shows signs of stress, notify the
carrier as well as the Hewlett-Packard office. Keep the shipping materials for the carrier's
inspection. The HP office will arrange for repair or replacement at HP option without waiting for
the claim settlement.
2-5. PREPARATION FOR USE
2-6. Power Requirements
2-7. The 10811A/B requires two power sources. One supplies power to the oscillator circuitry and the
other supplies power to the oven heaters.
Table 2-1 lists the required supply voltages and the
effect of a change in these voltages on the output frequency.
Table 2-1. Input Voltages/Voltage Coefficients
Voltage Coefficients
Input Circuit
Required
Voltage
Required Current/Power
Voltage
Change
Frequency
Change
1% <2 X 10
-10
Oscillator/
Amplifier
11.0-13.5V dc
Noise <100 µV
30 mA typical, 40 mA max.
20-30V dc 10% <1 X 10
-10
Oven Controller
Turn on load is 43 ohms minimum
Power drops to steady state value ( ≈ 2W)
within 10 min. at 25°C with 20V dc applied.
2-8. Both the 10811A and 10811 B have separate ground return paths for each section (oscillator and
oven circuits). Both grounds may be tied together or operated at any reasonable difference in
potential. Note the oscillator supply ground and 10 MHz output have a common ground return.
The outer housing for both oscillators is tied to this ground point. The 10811 B filtered
feedthrough grounds are also tied to the outer housing.
2-9. In order to maintain the high spectral purity of the 10811A/B output signal, the supply voltages
must be relatively clean. The supply ripple and noise on the 12-volt line (oscillator supply) must
be kept below 100 µV rms and the 20-volt line (oven supply) ripple and noise must be kept below
30 mV rms with both measured in the 10 Hz to 25 kHz range. A 1% change of the 12-volt supply
(oscillator) will cause
≤ 2
X
10
-10
change in output frequency. A 10% change in the 20-volt line
(oven) will cause a ≤ 1
X
10
-10
change in output frequency.