SRS Labs SIM940 Manual de operación

Operation and Service Manual

Rubidium Frequency Standard

SIM940

Stanford Research Systems

Revision 1.3 •May 8, 2007

Certiﬁcation

Stanford Research Systems certiﬁes that this product met its published speciﬁcations at the time

of shipment.

Warranty

This Stanford Research Systems product is warranted against defects in materials and workman-

ship for a period of one (1) year from the date of shipment.

Service

For warranty service or repair, this product must be returned to a Stanford Research Systems

authorized service facility. Contact Stanford Research Systems or an authorized representative

before returning this product for repair.

Information in this document is subject to change without notice.

Stanford Research Systems, Inc.

1290–D Reamwood Avenue

Sunnyvale, CA 94089 USA

Phone: (408) 744-9040 •Fax: (408) 744-9049

www.thinkSRS.com •e-mail: [email protected]

Printed in U.S.A. Document number 9-01568-903

SIM940 Rubidium Frequency Standard

Contents

General Information iii

Service .............................. iii

Symbols ............................. iv

Speciﬁcations .......................... vi

1 Overview 1 – 1

1.1 Introduction to the Instrument . . . . . . . . . . . . . 1 – 2

1.2 Quick Start Guide . . . . . . . . . . . . . . . . . . . . . 1 – 3

1.3 SIMInterface........................ 1–5

2 Operation 2 – 1

2.1 Power............................ 2–2

2.2 Warm-up.......................... 2–2

2.3 Connection to other instruments . . . . . . . . . . . . 2 – 2

2.4 Connection to SRS Instruments . . . . . . . . . . . . . 2 – 3

2.5 Direct Frequency Control of the SIM940 . . . . . . . . 2 – 4

2.6 Using an External 1 pps Reference . . . . . . . . . . . 2 – 5

3 Monitor and Control 3 – 1

3.1 Setting up communications . . . . . . . . . . . . . . . 3 – 2

3.2 Getting connected . . . . . . . . . . . . . . . . . . . . . 3 – 2

3.3 Testing connection . . . . . . . . . . . . . . . . . . . . 3 – 3

3.4 Connecting to the SIM940 . . . . . . . . . . . . . . . . 3 – 3

3.5 Terminal program . . . . . . . . . . . . . . . . . . . . . 3 – 4

3.6 RubidiumStats ...................... 3–5

3.7 RbMon menus........................ 3–8

ii Contents

4 Calibration 4 – 1

4.1 With a frequency counter . . . . . . . . . . . . . . . . . 4 – 2

4.2 With a 1 pps reference . . . . . . . . . . . . . . . . . . 4 – 4

4.3 Calibration of the time-tag oﬀset parameter . . . . . . 4 – 6

5 Circuitry 5 – 1

5.1 Circuit Discussion . . . . . . . . . . . . . . . . . . . . . 5 – 2

5.2 Component parts list . . . . . . . . . . . . . . . . . . . 5 – 5

5.3 Schematic Diagrams . . . . . . . . . . . . . . . . . . . 5 – 5

Addendum: PRS10 Manual

SIM940 Rubidium Frequency Standard

General Information

The SIM940 Rubidium Frequency Standard, part of Stanford Re-

search Systems’ Small Instrumentation Modules family, is a 10 MHz

frequency standard with an estimated 20-year aging of less than

0.005 ppm.

Service

Do not install substitute parts or perform any unauthorized modiﬁ-

cations to this instrument.

The SIM940 is a double-wide module designed to be used inside the

SIM900 Mainframe. Do not turn on the power until the module is

completely inserted into the mainframe and locked in place.

iii

iv General Information

Symbols you may Find on SRS Products

Symbol Description

Alternating current

Caution - risk of electric shock

Frame or chassis terminal

Caution - refer to accompanying documents

Earth (ground) terminal

Battery

Fuse

On (supply)

Off (supply)

SIM940 Rubidium Frequency Standard

General Information v

Notation

The following notation will be used throughout this manual:

•Front-panel indicators are set as Overload.

•Remote command names are set as ID?.

•Literal text other than command names is set as OFF.

SIM940 Rubidium Frequency Standard

vi General Information

Speciﬁcations

Performance Characteristics

Output Output frequency 10 MHz sine,

10 µs wide 1 pps pulse

Amplitude (±10 %) 0.5 Vrms (+7 dBm) into 50 Ω

1 pps pulse amplitude 2.5 V into 50 Ω, 5 V into high-Z

Noise Phase noise (SSB) <−130 dBc/Hz (10 Hz)

<−140 dBc/Hz (100 Hz)

<−150 dBc/Hz (1 kHz)

<−155 dBc/Hz (10 kHz)

Spurious <−100 dBc (100 kHz BW)

Harmonics <−60 dBc

Short term stability <2×10−11 (1 s)

(Allan variance) <1×10−11 (10 s)

<2×10−12 (100 s)

Accuracy Accuracy at shipment ±5×10−11

Aging (after 30 days) <5×10−11 (monthly)

<5×10−10 (yearly)

5×10−9(20 years, typ.)

Holdover 72 h Stratum 1 level

(1 ×10−11)

Frequency retrace ±5×10−11 (72 h oﬀ, then 72 h on)

Control Settability <5×10−12

Trim range ±2×10−9(0 to 5 VDC)

±0.5 ppm (remote interface)

Warm-up time <6 minutes (time to lock)

<7 minutes (time to 1 ×10−9)

SIM940 Rubidium Frequency Standard

General Information vii

Interfaces

Front-panel LEDs Locked Indicates frequency is lock to

rubidium

Unlocked Indicates frequency is unlocked

1 pps input Blinks with each 1 pps reference

input applied to rear panel

1 pps sync Indicates 1 pps output is

synchronized within ±1µs of

1 pps input

Rear Panel (BNCs) Frequency Adjust 0 to 5 VDC adjusts frequency

by ±0.002 ppm

1 pps input 100 kΩinput. Requires CMOS

level pulses (0 to 5 VDC). If an

external 1 pps input is applied, lock

is maintained between the 1 pps

input and 1 pps output with computer

adjustable time constant from 8 minutes

to 18 hours.

1 pps output 50 Ωpulse output

10 MHz outputs Three 50 ohm isolated 10 MHz

sine outputs

SIM (DB–15/male) power and communications

Operating Temperature +10 ◦C to +40 ◦C

Temperature stability ∆f/f<±1×10−10

(+10 ◦C to +40 ◦C)

Storage temperature −55 ◦C to +85 ◦C

Magnetic ﬁeld ∆f/f<±2×10−10 for 1 Gauss

ﬁeld reversal

Relative humidity 95 % (non-condensing)

General Characteristics

Interface Serial (RS-232) through SIM interface

Power +24 VDC

Supply current 2.2 A at start-up,

0.6 A after warm-up period

Weight 5 lbs

Dimensions 1.500 W×3.600 H×7.000 D

SIM940 Rubidium Frequency Standard

viii General Information

SIM940 Rubidium Frequency Standard

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