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PHONE: (434) 295-3101
FAX: (434) 977-1849
Charlottesville, VA USA
www.isotemp.com
OCXO 131-2
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 Put on new form, Added 2.5., 2.7. was
TBD, In 3.1. 4x10-7 was 3x10-7, 4.2. was 250
mA, 4.3. was 1 Watt, 7.3. was 125-501
BY
ADB
TST
APV DATE
JRD 10-14-1998
TST 02-28-2002
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 131-2
PAGE OF TOTAL DWG. NO. REV.
1 3 114-836 A

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Charlottesville, VA USA
www.isotemp.com
OCXO 131-2
1. OUTPUT
1.1. Frequency
1.2. Waveform
1.3. Level
1.4. Load
1.5. Harmonics
1.6. Spurious
10.000 MHz
Sine wave
+8 ±2 dBm
50
< -30 dBc
< -60 dBc
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. Load
2.5. Short term
2.6. Warm-up
2.7. Phase noise
a. @ 10 Hz
b. @ 100 Hz
c. @ 1 kHz
d. @ 10 kHz
e. @ 100 kHz
< ±2x10-8 from -30°C to +70°C
(referenced to +25°C)
< ±5x10-10/day
< ±5x10-10 after 30 days
< ±1x10-7
< ±3x10-7
< ±5x10-9/±5% change
< ±5x10-9/±5% change
< 5x10-11/second
root Allan variance
< ±2x10-8 in 5 minutes @ +25°C
(referenced to 4 hours)
< -120 dBc
< -135 dBc
< -150 dBc
< -150 dBc
< -150 dBc
3. ELECTRICAL FREQUENCY ADJUSTMENT (PIN = "VCO INPUT")
3.1. Range
> ±4x10-7
< ±9x10-7 (At time of shipment)
(Referenced to nominal frequency)
3.2. Control
0 VDC to Vref (+8 VDC) or
a 10 kpotentiometer connected
between the "REFERENCE VOLTAGE" pin
and "0 VOLTS & CASE" pin with wiper
connected to "VCO INPUT" pin.
3.3. Slope
Positive
3.4. Center
+4 VDC ±0.8 VDC
(control voltage at which nominal
frequency occurs at time of shipment)
3.5. Input impedance
> 100 k
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 131-2
PAGE OF TOTAL DWG. NO. REV.
2 3 114-836 A

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Charlottesville, VA USA
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OCXO 131-2
4. INPUT POWER (PIN = "+VDC")
4.1. Voltage
4.2. Current
4.3. Steady state
+12 VDC ±5%
< 300 mA @ turn on
< 1.5 Watts @ +25°C
5. REFERENCE VOLTAGE (PIN = "REFERENCE VOLTAGE"), an output
5.1. Voltage
+8 VDC ±5%
5.2. Load
> 8 k
5.3. Temperature stability
< ±0.015 VDC
(Over temperature range in 2.1.)
6. ENVIRONMENTAL
6.1. Humidity
6.2. Storage temperature
6.3. Vibration (non-operating)
6.4. Shock (non-operating)
6.5. Seal
MIL-STD-202F, Method 103B, Test
Condition A (95% R.H. @ +40°C,
non-condensing, 96 hours)
-50°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.
7. MECHANICAL
7.1. Applicable series
7.2. Model number
7.3. Outline drawing
OCXO 131 series
OCXO 131-2
125-587
NOTE:
This specification differs from the OCXO 131-2 listed in
the ISOTEMP catalogue in the following areas. 1. The turn
on current is 50 mA higher. 2. The steady state power is
0.5 Watts higher. 3. The width is 0.01 inches wider. 4.
The length is 0.06 inches longer.
ISOTEMP RESEARCH INC. CODE ID MODEL NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 131-2
PAGE OF TOTAL DWG. NO. REV.
3 3 114-836 A

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P/N:
MOD:
FREQ.:
S/N:
DATE:
FSC: 31785
(VIEW FROM TOP)
0.75
19.05
MAX.
0.026
0.66
0.20
5.08
MIN.
0.031
0.79
DIA.
PIN
(5
PLACES)
GLASS STANDOFF
(4 PLACES)
1.43
36.32
MAX.
1.000
25.40
CENT.
3
CL 2
1
4
5
0.700 CENT.
17.78
1.07
27.18
PIN CONNECTIONS
PIN FUNCTION
VCO INPUT
1 or
(See Note 1) NOT CONNECTED
REFERENCE VOLTAGE
2 or
(See Note 1) NOT CONNECTED
3 +VDC
4 R. F. OUTPUT
5 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.
(VIEW FROM BOTTOM)
NUMBERS FOR REFERENCE ONLY
(NOT STAMPED ON UNIT)
INCH
mm (REFERENCE ONLY)
OSCILLATORS
NAME: OUTLINE DRAWING
(TCXO 141 & OCXO 131 SERIES)
A 1.07 WAS 1.07 MAX.
LET REVISION
FORM NO. 120-081D
CHARLOTTESVILLE, VIRGINIA
CODE I.D. NO. SCALE: 1:1
DATE: 12-04-00
31785 DWN. BY: LRB
APPR'D. BY: DAG
DAG TST 12-6-01
BY APP DATE
TOLERANCES
UNLESS OTHERWISE SPECIFIED:
ANGLES: ±1 DEGREE
FRACTIONS: ±1/32 INCH
DECIMALS: .XX ±.015, .XXX ±.010 INCHES
MAT'L: STEEL
FINISH: NICKEL
MARK: LABEL