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FAQ Index

Click on one of the frequently asked questions below to go directly to its answer
Or click on the black category name to browse all the answers in that category
General questions are listed first, followed by product specific questions
General, Data Acquisition, USBxCH, SERxCH, GPS

General Questions
How do I order ?
How much does it cost ?
Can I purchase it on my credit card ?
What is your address, email, phone, etc ?
Do you sell to international customers ?
What Operating Systems do you support (Windows, Linux, etc) ?
Do you include source code with your software ?
Is the software complete ?
What compilers can I use with your software ?
What is a device driver ?
Do you supply any DLL libraries ?
Can you send me complete specs ?
How do I get a copy of the circuit diagrams ?
Do you have any Application Notes ?
What about the difference between 220v and 110v power ?
Will a 12vdc wall transformer work with the VREF-399 ?
What is your ROHS and WEEE status ?
Data Acquisition Questions - General
What do abbreviations like DAQ, DAS, A/D, ADC, D/A, DAC mean ?
What is the difference between instrument and audio grade A/D converters ?
Why is memory buffering important for A/D systems ?
How do oversampling and signal averaging affect resolution ?
Why does sigma delta A/D resolution vary with sampling rate ?
What is analog multiplexing ?
What is the trouble with high impedance analog inputs ?
What is an active sensor ? What is a passive sensor ?
What are differential inputs ?
What are balanced differential inputs ?
My sensor only has two pins, what do I do for differential AGND ?
How do I calibrate the A/D converters ?
Is twisted pair good for analog inputs ?
How much crosstalk is there between channels on your A/D products ?
What is the format of your data files ?
Data Acquisition Questions - USBxCH specific
What sampling rates are allowed on the USBxCH ?
What is the maximum achievable sampling rate on the USBxCH ?
How much crosstalk is there between channels on the USBxCH ?
What is the analog input range of the USBxCH ?
What is the overvoltage protection range of the USBxCH ?
Does the USBxCH have any digital input/output capabilities ?
What is the impedance of the USBxCH analog inputs ?
What is the input sensitivity of the USBxCH ?
How do I calibrate the USBxCH A/D converters ?
What length USB cable can I use with the USBxCH ?
What GPS antennas can I use with the USBxCH ?
How does your USBxCH GPS time stamping work ?
Can I use the USBGPS by itself to get time without the USBxCH ?
What is the typical USBxCH GPS time accuracy ?
What NMEA messages are available with the USBGPS and what is their format ?
Why is the USBGPS time not working ?
How can I set the PC time with the USBGPS ?
Data Acquisition Questions - SERxCH specific
Where can I find more info and FAQ answers on the SERxCH ?
What is a ratiometric application ?
Can I use the SERxCH with Excel, MatLab, VisualBasic, LabView, TestPoint ?
What analog input voltage ranges are possible for the SERxCH ?
Why does waving my hand over the SERxCH change the DVM voltage ?
Do static shocks hurt the SERxCH inputs ?
Do the SERxCH have any digital buffering ?
Is there any antialiasing filter on the SERxCH ?
Do the SERxCH systems perform GPS time stamping ?
What format are the SER1CH-UA output files in ?
What kind and length of RS232 serial cable does the SER1CH-UA require ?
Will USB to RS232 dongles work with the SER1CH-UA ?
Why is the SER1CH-UA consuming more than 10ma ?
GPS Questions - General
What do abbreviations like GPS, PPS, NMEA mean ?
What GPS antennas can I use with your products ?
Can I use GPS in my basement ?
What if the antenna cable is too short to reach the window ?
Why is my GPS giving 19 year old dates ? Copyright © Symmetric Research