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PHONE: (434) 295-3101
FAX: (434) 977-1849
Charlottesville, VA USA
www.isotemp.com
OCXO 143-1
CRYSTAL
OSCILLATOR
SPECIFICATION
This specification defines the operating characteristics of
an ovenized crystal oscillator. Long term stability is
assured through use of premium components.
REV DESCRIPTION OF REVISION
-
A New form,7.7.3. 125-606 was 125-502
BY APV
DATE
DAG TST 09-09-1999
LRB TST 10-20-2003
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-1
PAGE OF TOTAL DWG. NO. REV.
1 3 114-918 A

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Charlottesville, VA USA
www.isotemp.com
OCXO 143-1
1. OUTPUT
1.1. Frequency
1.2. Waveform
1.3. Level
1.4. Load
1.5. Harmonics
1.6. Spurious
2. FREQUENCY STABILITY
2.1. Ambient
2.2. Aging
a. At time of shipment
b. After indefinite storage
i. Daily
ii. Yearly
iii. 10 years
2.3. Voltage
2.4. Short term
2.5. Load
2.6. Warm-up
2.7. Phase noise
a. @ 10 Hz
b. @ 100 Hz
c. @ 1 kHz
d. @ 10 kHz
e. @ 100 kHz
3. ELECTRICAL FREQUENCY ADJUSTMENT
3.1. Range
3.2. Control
3.3. Slope
3.4. Center
3.5. Linearity
3.6. Input impedance
4. INPUT POWER
4.1. Voltage
4.2. Current
4.3. Steady state
10.000 MHz
Sine wave
+4 dBm ±2 dBm
50
< -20 dBc
< -60 dBc
< ±1x10-7 from 0°C to +70°C
(referenced to +25°C)
< ±1x10-8/day
< ±1x10-8 after 30 days
< ±1x10-6
< ±4x10-6
< ±3x10-8/±5% change
< 1x10-9/1 second
root Allan variance
< ±3x10-8/±5% change
< ±1x10-7 in 3 minutes @ +25°C
(referenced to 2 hours)
< -90 dBc
< -120 dBc
< -140 dBc
< -140 dBc
< -150 dBc
> ±10x10-6
< ±20x10-6
0 to +4 VDC
Positive
+2 VDC ±0.4 VDC
(control voltage at which nominal
frequency occurs at time of shipment)
< ±10%
> 50 k
+5 VDC ±5%
< 700 mA @ turn on
< 1.5 Watts @ +25°C
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-1
PAGE OF TOTAL DWG. NO. REV.
2 3 114-918 A

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Charlottesville, VA USA
www.isotemp.com
OCXO 143-1
5. REFERENCE VOLTAGE
5.1. Voltage
5.2. Load
5.3. Temperature stability
6. ENVIRONMENTAL
6.1. Storage temperature
6.2. Vibration (non-operating)
6.3. Shock (non-operating)
6.4. Seal
7. MECHANICAL
7.1. Applicable series
7.2. Model number
7.3. Outline drawing
+4 VDC ±5%
> 9 k
< ±0.010 VDC
(Over temperature range in 2.1)
-55°C to +85°C
MIL-STD-202F Method 201A. (0.06"
Total p-p, 10 to 55 Hz)
MIL-STD-202F, Method 213B, Test
Condition J.
(30 g, 11 ms half-sine)
MIL-STD-202F, Method 112C, Test
Condition D.
OCXO 143 series
OCXO 143-1
125-606
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 143-1
PAGE OF TOTAL DWG. NO. REV.
3 3 114-918 A

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P/N:
MOD:
FREQ.:
S/N:
DATE:
FSC: 31785
(VIEW FROM TOP)
GLASS STANDOFF
(4 PLACES)
0.700
17.78
CENT.
0.026
0.66
0.59 MAX.
14.99
0.20 MIN.
5.08
0.030 DIA. PIN (5 PLACES)
0.76
PIN CONNECTIONS
PIN
1
(See Note 1)
2
(See Note 1)
3
4
5
FUNCTION
VCO INPUT
or
NOT CONNECTED
REFERENCE VOLTAGE
or
NOT CONNECTED
+VDC
R.F. OUTPUT
0 VOLTS & CASE
Note 1. If the specification does not specify
parameters for either PIN1 or PIN2 then that
respective PIN is NOT internally CONNECTED.
3
2
CL
4
0.700
17.78
CENT.
1.015
25.78
SQ. MAX.
15
(VIEW FROM BOTTOM)
NUMBERS FOR REFERENCE ONLY
(NOT STAMPED ON UNIT)
INCH
mm (REFERENCE ONLY)
Form NO. 120-081E
OSCILLATORS
NAME: OUTLINE DRAWING
(OCXO 143 SERIES)
CODE I.D. NO.
31785
Charlottesville, Virgina USA
SCALE: 2:1
DATE: 09-23-2002
DWN. BY: DAG APPR'D. BY: TST
LET REVISION
BY APP
DATE
TOLERANCES
UNLESS OTHERWISE SPECIFIED:
ANGES: ±1 DEGREE
FRACTIONS: ±1/32 INCH
DECIMALS: .XX ± .015, .XXX ± .010 INCH
MATERIAL: STEEL
FINISH: NICKEL
MARK: LABEL