User Manual
14
UM-20 Low-cost Oven-controlled Crystal Oscillator (OCXO) Assembly
Usage
Frequency Survey
The initial accuracies of the used OCXO131-40s are listed below.
6
Initial output
(Hz) after 30
minutes
Initial
V_TRIM
(Vdc)
S/N
Date
VCO
not connected,
i.e., untrimmed
V_TRIM
(V)
required for
10.000000MHz,
output into 50
Ω
Current
draw (mA)
after 30
minutes, at
12.00Vdc
1946-88 0223
10,000,001.04
2.37 2.12
110
2140-395 0301
neither assembled nor tested
2140-618 0310
9,999,999.82
2.38
2.49
113
2140-624 0310
9,999,999.19
2.42
2.76
85
2302-1000 0406
10,000,000.04
2.41
2.43
95
4231-0013 0902
9,999,999.55
2.39
2.61
112
Table 3: Frequency survey of OCXO131-40 units,
installed on 705-01667A PCBs
Assembly
Five modules were assembled by hand, using the Pumpkin PCB
and five of the six OCXO131-40s that we acquired. The module
with its attached harness is shown in Figure 4 and Figure 5.
Figure 4: Top view of
assembled module
Figure 5: Bottom view of
assembled module
6
An XL Microwave Model 3120 with a GPS DO 10MHz external reference was
used for the frequency measurements; a Fluke 289 DMM was used for the
V_TRIM
measurements; an Agilent E3620A provided the
V_TRIM
voltage
and
12Vdc power.
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