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USBTMC stands for USB Test & Measurement Class. Any USB device conforms to USBTMC without the limitations of operation systems and environment can work under VISA assistance, and communicate with a computer.In other words, the control procedures via VISA to USBTMC device and via VISA to GPIB device are the same.
The advantage of using USBTMC with M3500A is that you dont have to buy any expensive GPIB module, and waste time to re-program the previous application software which is for GPIB. Only the instruments conform to USBTMC protocol in the VISA basis, and the version of NI-VISA 3.1 or upward driver is installed. The USBTMC unit under the original GPIB software will be recognized, and can be easily used. Besides, it also offers users other benefits, for example, support 127 DMM connections at a time, USB cord can work with a long distance application (at most 30M), and it is easy to get the cord. (For more detail USBTMC information,please click here [Q.What is USBTMC? ].
USBTMC Application Note:
Before using USBTMC, please click into NI website www.ni.com – NI-VISA to download NI driver. After setting up M3500A application software, PT-TOOL & PT-LINK (enclosed in the CD), or your own programs, the M3500A will be controlled easily.
The FS740 GPS Disciplined Oscillator (GPSDO) provides a 10 MHz frequency reference which is disciplined by GPS with a long-term stability of better than 1 × 10-13. The instrument can also time tag external events with respect to UTC or GPS and measure the frequency of user inputs. The instrument has DDS synthesized frequency outputs, adjustable rate (and width) pulse outputs, and an AUX output for arbitrary waveforms including an IRIG-B timecode output.
Greatly attenuates the effects of low frequency ground loops
Supports the 2 Port Shunt Thru impedance measurement required for Power Distribution Networks (PDN’s)
Maintains 50 Ohm transmission line integrity to approximately 500MHz
Works with all types of test equipment to eliminate ground loops, such as Network Analyzers, Oscilloscopes and Spectrum Analyzers
The J2113A is a solid-state Semi-Floating Amplifier (SFA), or ground loop isolator, that provides the BEST isolation for low impedance measurements. The J2113A removes the groups loops associated with VNAs and Oscilloscopes which occur in many different types of test setups. The ground loops are often subtle or hidden and can impact the measurement results dramatically if not accounted for. The J2113As frequency response, as shown below, is flat from DC to over 800MHz, all while maintaining 50Ohm impedance at both the input and the output for accurate, low-noise measurements. It allows measurement both lower and higher in frequency than achievable with a Common Mode Transformer. The J2113A supports power distribution network (PDN) measurement, component measurement, PSRR testing and many other applications.
The J2180A low noise preamplifier provides a fixed, AC coupled 20dB gain while converting a 1 MOhm input impedance to a 50 Ohm output impedance. With a 3dB bandwidth of 0.1Hz to 100MHz, the preamplifier improves the sensitivity of oscilloscopes, network analyzers and spectrum analyzers while reducing the effective noise floor and spurious response. The preamplifier can also serve as a low frequency DC blocker for a spectrum analyzer or you can use it to connect a high input impedance oscilloscope probe to 50 Ohm equipment.
The J2180A preamplifier offers very low noise, fast 100V/uS slew rate for pulse applications and very low distortion for audio applications.