VX4101 Tektronix 5.5 Digit Digital Multimeter/2-channel 250 MHz Counter

The VX4101 DMM/Counter is a C size single slot VXI instrument for use in a mainframe conforming to the VXIbus Specification. The VX4101 provides three of the most common functions needed in a typical VXI system:

• Full function 5 1/2 digit Digital Multimeter (DMM)
• Full function 2-channel 250 MHz Universal Counter
• Scanner master function for the Tektronix SurePath family of VXI relay modules

DMM
The DMM has full function autoranging with 5 1/2 digit resolution. Measurements can be returned as single measurements, or as an array with up to 4096 measurements via the Fast Data Channel Protocol. Power cycle averaging modes are available for 60 Hz, and 50 Hz. The autozero and autogain capabilities minimizes offset and gain drift errors without removing the customer input connections. The DMM has floating input isolation of 300 VDC or AC RMS. It also features programmable aperture time from 1 ms to 2 seconds in 1 ms steps.

Counter
The Universal Counter in the VX4101 brings unprecedented performance to VXI in terms of both speed and resolution. The features include:
• Two input channels for frequency, period, rise and fall time, positive and negative pulse width, frequency ratio, totalizer, time interval, and AC/DC voltage measurements
• 1 MHz to 250 MHz frequency measurements
• Input signal conditioning: x1, x10, x100 attenuation with 0.5 to 10.0 variable gain and up to ±100 V offset depending on attenuation
• DC or AC coupling, and 50 Ω or 1-MΩ input (with automatic over current protection for the 50 Ω mode)
• 250 ns resolution (1 ps with averaging) and timing measurements from –1 ns single-shots to 99 day averaging
• Measurement gating from one of several sources, including VXI TTL triggers, counter front panel arm, software triggers, periodic trigger, DMM end-of-measurement, and SurePath relay switched and settled.
• Channel 2 can be used as a high speed gate for channel 1