Introduction The SC61 Waveform Analyzer represents the first improvement in waveform measuring techniques since the first oscilloscope was introduced over 50 years ago. Before the SC61, all oscilloscopes were strictly analog devices. Even.- measurement of peak-to-peak amplitude, time, or frequency required matching the waveform to CRT graticule markings, estimating parts of a CRT division or part of a cycle of the waveform and multiplying the size of the waveform times the setting of the horizontal or vertical switches. The measurements were not very- accurate (typical accuracy on an analog scope is ±15% when interpretation error is considered), were time consuming, and were subject to many errors (such as forgetting to turn the vernier to the calibrated position). The SC61 combines the waveform analyzing capability of a high quality oscilloscope with the speed, accuracy, and freedom from errors of a computer. The SC61 has a microcomputer that monitors the vertical and horizontal circuits at all times. You just push a button when you want to measure all or part of a waveform. The microcomputer determines the reading, automatically sets the decimal, and produces a direct digital readout of the value. Features The SC61 Waveform Analyzer starts with a high quality oscilloscope. The CRT display section has a bandwidth of 60 MHz. and is usable to 100 MHz to show the needed detail when analyzing digital signals. Specially designed sync circuits (using differential amplifiers and emitter-coupled logic stages) provide solid triggering with the fewest trigger adjustments possible. The input capabilities extend from 5 millivolts per division all the way to 2000 volts DC or AC peak-to-peak. Special video circuits simplify analyzing composite video waveforms. Sync separators produce stable triggering on these complex signals. Additional stages eliminate the half-line shift on interlaced signals, while others eliminate vertical sync from interfering with digital readings of signals displayed at the horizontal sweep rate. Video preset buttons allow pushbutton selection of vertical or horizontal scanning frequencies. There are two types of digital measurements made through the same probe used for the CRT display. The first three functions for each channel are called the Auto-Tracking™ tests. Auto-Tracking means the microcomputer automatically tracks the CRT display at all times. The three Auto-Tracking functions are DC volts, peak-to-peak volts, and frequency. All three functions measure the entire waveform. The second group of digital tests are the Delta tests which let you measure part of a waveform. These tests measure the peak-to-peak amplitude, time, or frequency of any part of the waveform shown on the CRT. Both types of digital tests are unaffected by the vertical or horizontal verniers or position controls, allowing the CRT display to be any size you want without affecting the accuracy of the digital readout. All tests are automatically ranged or directly interfaced to the input attenuators for direct readings. One final test allows the frequency of the signal applied to channel A to be compared to the frequency of the signal applied to channel B. The digital display shows the ratio of the two frequencies to troubleshoot divider or multiplier stages.