Category: About ESS

Terms + ConditionsTerms + Conditions



Limits of Liability and Terms: Please read

Liability: E.S.S. limits our liability for all work to the amount the buyer paid for our services.  IN NO case shall the limit exceed this amount unless separate insurance coverage is purchased. This includes any damage suffered in a component or sub-system where a component is installed.  Customers requesting higher limits MUST DECLARE SO IN WRITING, PRIOR TO THE ISSUANCE OF A PURCHASE ORDER, OR CONTRACT so that we may obtain appropriate insurance coverage for the job in question. For any questions regarding our terms and/or conditions or this quotation, please feel free to call us directly. 

Payment Terms:  When a quotation includes engineering charges; 25% of NRE charges will be invoiced at the time of order.  25% will be invoiced at delivery of paper design. Remaining 50% will be invoiced upon completion of design and /or prototype or  90 days after delivery of paper design; whichever comes first.  ALL INVOICES ARE DUE, NET 30.  FOB: EAST BRIDGEWATER, MA.  02333.  Overdue invoices past 60 days are subject to a $ 30.00 / month service charge plus interest on the amount due at a rate of 18% annum. This amount must be paid in full prior to any future work performed.  If additional charges are not received with payment, it will be added to future quotations. ESS reserves the right to decline or revoke credit terms for poor or late payment history, or for any other reason.

Shipping/Delivery:  E.S.S. tries to minimize delivery times whenever possible. Please note, however, that the delivery dates listed here are based on our current work schedule at the time of quotation. Delivery dates will depend on our in house workload at the time the order is placed. Please call E.S.S. for updated delivery schedules at the time of order, if this is of concern.  ESS is not liable for late deliveries unless previously agreed to in writing prior to issuance of a purchase order.  Lead time is the time between the receipt and acceptance of an order and the day the product or service is shipped from our facility. Lead times on quotations are estimates and are confirmed at time a PO is received and accepted.

Standard shipping terms are “prepaid and add,” F.O.B. our shipping dock in East Bridgewater, MA, USA.  ESS will ship via the shipping company of our choice, making a good faith effort to find the most cost effective method, and will invoice freight costs to the customer. In general, for small package shipments, ESS uses Fed-Ex priority standard overnight because we get rates comparable to ground service and believe this get our product to customers guaranteed faster. Goods shipping “F.O.B. East Bridgewater, MA” means all freight costs, including inland freight costs to depots, ports and airports, are borne by the customer.

ESS can also ship “Collect” if the customer provides a shipping company and account number.  In this case all freight charges are billed directly to the customer’s account and no freight charges will be invoiced by when shipping “Collect,” all liability for shipping damage or loss, once the goods leave our dock, rests with the customer, unless it is determined the damage is a result of improper packaging. For certain larger and special items, packaging costs may still apply and will be listed separately in our quote.

Warranties:  Engineering Specialties Service warrants all of our products against manufacturing and material defects for a period of 90 days from the date of shipment.  Our products are fully inspected to conformance to all purchase order requirements at the time of shipping.  If prolonged storage, non-use, or delays with incoming inspection at your facility beyond this time determine that you find discrepancies with our products, we may at our discretion refuse the return or invoke a restocking, retesting, or re-evaluation charges to research the purchase order, your discrepancy, and the job details. Absorbing products supplied by Engineering Specialties Service are batch sensitive resulting in time-date correlation.  Products not used or inspected by customers within this reasonable time could be subject to environmental changes beyond our control as well as replacement of raw materials being currently used in our facility.  This process requires a more exhaustive paperwork research to quantify the product and batch number used in your specific product. To avoid these charges and delays, we suggest you thoroughly inspect all products within 90 days of receipt and contact us immediately if you find any defective requirement noted on the drawing or purchase order.

In-House EquipmentIn-House Equipment



All pertinent equipment located at E.S.S. is under current calibration standards.

Automatic Network Analysis using Vector and Scalar Analyzers
We have the latest vector and scalar analyzers with time domain, capable of testing components for amplitude, phase, group delay, and design verification from DC up to 65 GHz. These systems are used for testing, analysis, design verification, and qualification testing for all types of active and passive components. We measure all S-parameters for VSWR, Insertion loss, Isolation and any other microwave test requirement.

Network Analyzer Equipment List:

  • HP8722D with Time domain and TRL options:  50 MHz to 40 GHz. Swept automatic Vector network Analyzer system. With time domain, we interrogate components for design issues and product improvements and locate the physical areas of the problem. The TRL option allows us to calibrate a system for testing microstrip and stripline components using a better calibration standard system.
  • Anritsu 37397C: 40MHz to 65GHz. Provides us with the same testing capabilities of the HP8722D, but allows us to go higher in frequency.
  • HP8753D:  300 KHz to 3.0 GHz. Swept automatic Vector network Analyzer system. Provides all of the features of the higher frequency analyzers with low frequency capability.
  • HP8757D Scalar Network Analyzer system:10 MHz to 50 GHz. using a complete line of dual waveguide Reflectometry setups from WR650 to WR-22. This system utilizes single Swept network Analyzer system for magnitude measurements of insertion loss, isolation and VSWR.

Our analyzers provide data in email, Excel, and JPEG formats in addition to normal hard copy plots for ease of communication, graphical test reports, and further data/mathematical analysis using the tools of modern computers.

Spectrum and Time Analysis:
We have time oscilloscopes, TDR (Time Domain reflectometers) and spectrum analyzers from 100 KHz to 22 GHz for single frequency and high dynamic range measurements. We test components and frequency stability devices with this type of equipment. 

Spectrum Analyzer and Oscilloscope Equipment List:

  • Will-TEK, 9101 Digital Spectrum Analyzer: 100 KHz to 4 GHz. for analyzing time based or frequency modulated signals, recording data, side lobes, signal to noise and RF leakage.
  • HP8565A Spectrum Analyzer: 10 MHz to 22 GHz. for analyzing time based or frequency modulated signals.  
  • AEA 20/20 TDR:  Digital and field ready, TDR used for cable analysis, opens/shorts, and cable analysis in the time domain.  Use to detect non-conformities and manufacturing flaws in cables, or other non visual components that may have problems.  
  • HP8082A:  Pulse/Function generator. Allows variations in pulse width, PRF, pulse shape, pulse delay and rise/fall times for pulse analysis and responses of devices.  
  • Sweep/Function generator system: 100 KHz to 20 MHz. Used for low frequency or non-sinusoidal swept measurements. Using this setup we can measure, simulate and duplicate pulsed systems and test setups for rise and fall times, changes in pulse shape, frequency drop off, modulation effects and data rate analysis.
  • TEK2024B; 200 MHz, 4 channel, 2 GHz sampling digitizing oscilloscope for time domain measurements.
  • Related and Support Test Equipment:  In addition to the above list of equipment, our lab is furnished with many power meters, oscilloscopes, sweep generators, waveguide and coaxial hardware, fixtures, and most normal accessories as would be expected within a microwave laboratory.  In addition, we typically procure or rent any equipment that may be special or required for particular tests that we feel should be part of our lab, all at no additional cost to you.

Environmental Equipment: 

  • High Power Testing: We have high power sources and test capabilities both in and out of house. This testing service provides our customers with high power verification and heating requirements.
  • Temperature Chambers: Our chambers used in conjunction with our test equipment, can verify components operate over temperature. We provide the equipment, setup and test hardware.
  • Model Shop: We have a small in-house model shop for fixture design, and component modifications. Our shop is dedicated to engineering reworks or designs to expedite in house jobs.

About UsAbout Us



Engineering Specialties Service, E.S.S.,  provides expert services in high frequency consulting in passive microwave products, design support, hardware prototypes, qualification and production testing, and simulation modeling. We have been in business specializing in microwave design since 1988 serving the medical, defense, and commercial markets world wide. If you have a high frequency problem, we can probably help. Contact us today!

At present, we are NOT ISO certified, however, we do operate to ISO9100 and 9001-2015. We can provide a copy of our quality manual which shows our internal policies to verify that we meet this requirement.  Our purchasing, receiving inspection, engineering, drafting, in-processing, and final inspections all follow the formats contained in the ISO standards.

We have found that being a small company, it is more efficient for us and our customers to remain conformant to ISO but not certified. If you have any questions or concerns, do not hesitate to contact us

Our Facility

Our microwave laboratory meets the latest standards and specifications for testing, calibration and quality. Our facility includes a full range of microwave test equipment, prototype shop, and high frequency software to offer complete design, test and engineering solutions. We also provide production, qualification and prototype testing services.   

We specialize in unique designs and products. Some of our specialties include ferrite devices, (circulators, isolators, phase shifters) low-loss microwave dielectrics, rotary joints, lossy absorbers, couplers, and most passive components used in the microwave frequency range. We work with waveguide, coaxial, stripline, microstrip, finline and most all microwave transmission line mediums. We supply paper designs, prototypes, and production hardware to your specifications and standards.  

We thank you for visiting our website. If there is anything we can help you with, please feel free to contact us!

Contact UsContact Us



We are located at 680 North Bedford Street in East Bridgewater, MA on the second floor

If you have any questions about particular applications, quotations or comments please feel free to email us at sales@engineeringspecialties.net

Phone: 508-378-1112 Fax: 508-378-2410

Identification Numbers

  • DUNS: 004670498
  • CAGE: 0LV26
  • TPIN: 1998C240585 (Trading Partner Profile)