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OCXO 131-42
P.O. BOX 3389
CHARLOTTESVILLE, VIRGINIA 22903
PHONE: (804) 295-3101
FAX: (804) 977-1849
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
REQ. DWN.
BY BY
DATE
- ADB TST 09-23-98
A 2.4. was To Be Determined, 2.6. was To Be
ADB TST 09-28-98
Determined, 3.1. was > ±6x10-6, < ±12x10-6,
3.2. was 0 to +5 VDC, 3.3. was Positive, 3.4.
was +2.5 VDC ±0.5 VDC, Added Goal < 250 mA @
turn on to 4.2.
B 1.6. WAS 15 ns, 2.6. was -75 dBc, 3.5.was 20% ADB TST 10-13-98
C Removed < -85 dBc (Best effort) from 2.6.
4.2. was < 400 mA @ turn on, Goal < 250 mA @
turn on
TST TST 12-15-98
D Outline drawing was 125-501.
LRB TST 05-01-00
ISOTEMP RESEARCH INC. CODE ID. PART NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 131-42
PAGE OF TOTAL DWG. NO. REV.
1 3 114-834 D

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OCXO 131-42
1. OUTPUT
1.1. Frequency
1.2. Waveform
1.3. Level
a. "1" level
b. "0" level
1.4. Load
1.5. Duty cycle
1.6. Rise/fall time
1.7. 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. Warm-up
2.6. Phase noise
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
38.880 MHz
Rectangular
HCMOS
> +4.4 VDC
< +0.4 VDC
2 TTL
45% to 55% @ +2.5 VDC
< 5 ns (10% to 90%)
< -60 dBc
< ±1x10-7 from 0°C to +50°C
(referenced to +25°C)
< ±1x10-8/day
< ±1x10-8 after 30 days
< ±1x10-6
< ±4x10-6
< ±3x10-8/±5% change
< 5x10-10/second
root Allan variance
< ±1x10-7 in 5 minutes @ +25°C
(referenced to 1 hour)
< -80 dBc @ 10 Hz
> ±6x10-6
< ±9x10-6 (At time of shipment)
(Referenced to nominal frequency)
-5 VDC to +5 VDC
Negative
0 ±0.5 VDC
(control voltage at which nominal
frequency occurs at time of shipment)
< ±12%
> 100 k
+12 VDC ±10%
< 250 mA @ turn on @ +25°C
< 1.4 Watts @ +25°C
ISOTEMP RESEARCH INC. CODE ID. PART NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 131-42
PAGE OF TOTAL DWG. NO. REV.
2 3 114-834 D

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OCXO 131-42
5. REFERENCE VOLTAGE
5.1. Voltage
5.2. Load
5.3. Temperature stability
6. ENVIRONMENTAL
6.1. Humidity
6.2. Storage temperature
6.3. Vibration (non-operating)
6.4. Shock (non-operating)
6.5. Seal
7. MECHANICAL
7.1. Applicable series
7.2. Model number
7.3. Outline drawing
+5 VDC ±5%
> 9 k
< ±0.015 VDC
(Over temperature range in 2.1.)
MIL-STD-202F, Method 103B, Test
Condition A (95% R.H. @ +40°C,
non-condensing, 96 hours)
-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 131 series
OCXO 131-42
125-573
ISOTEMP RESEARCH INC. CODE ID. PART NO.
CHARLOTTESVILLE, VA.
USA 31785 OCXO 131-42
PAGE OF TOTAL DWG. NO. REV.
3 3 114-834 D

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P/N:
MOD:
FREQ.:
S/N:
DATE:
FSC: 31785
.50
MAX.
.020 .20 MIN.
.030 DIA. PIN
(5 PLACES)
METAL STANDOFF
(4 PLACES)
1.41 MAX.
1.000
CENT.
3
CL 2
4
15
1.01
MAX.
.700
CENT.
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.
NUMBERS FOR REFERENCE ONLY
(NOT STAMPED ON UNIT)
FORM NO. 120-081D
OSCILLATORS
NAME: OUTLINE DRAWING
(TCXO 141 & OCXO 131 SERIES)
CHARLOTTESVILLE, VIRGINIA
CODE I.D. NO. SCALE: 1:1
DATE: 08-30-99
31785 DWN. BY: BTG APPR'D. BY: DAG
B REDRAWN - NEW FORM, REVISED LABEL
C PIN 1 was VCO INPUT, PIN 2 was REFERENCE VOLTAGE, Added Note 1. These changes
were made so that this drawing will accommodate units where PIN 1 and/ or PIN 2 are not connected.
LET REVISION
LRB DAG 06-13-00
TOLERANCES
DAG
DAG
07-12-00
UNLESS OTHERWISE SPECIFIED:
ANGLES: ±1 DEGREE
FRACTIONS: ±1/32 INCH
DECIMALS: .XX ±.015, .XXX ±.010
MAT'L: COLD ROLLED STEEL
FINISH: BRIGHT NICKEL
BY APP DATE MARK: LABEL