Model 12C is a high speed, high input impedance active probe for measuring the internal node voltage of integrated circuits. The input is 1 megohm shunted by 0.1 pf and the rise/fall times are 0.8ns. This instrument has full dc capability and can be used with any oscilloscope. The Model 12C was specially designed so that when used in conjunction with a high input impedance oscilloscope signal attenuation is 10:1 and with a 50 Ohm input signal attenuation is 20:1.
Rugged, dependable, and high speed the Model 12C presents a very modest load to the integrated circuit. It can be used to troubleshoot high speed bipolar, NMOS and CMOS circuits-even some short holding time dynamic nodes. Each amplifier is individually optimized during manufacture for peak performance and reliability. The Model 12C will withstand large input overvoltages. The only known failure mode is the accidental breaking or crushing of the probe tip which can be easily replaced. A large selection of probe tips are available to accommodate a variety of probing needs.
Model 12C tips slide easily in and out of the Model 12C probe body. They consist of a housing, a precision resistor/capacitor combination, and a 22 micron tungsten probing wire that is tapered to a fine point of less than one micron. The 22 micron tungsten wire allows ample flexing so the probe point and the circuit tend to remain in contact even in the presence of probe table vibrations. In addition, flexing reduces the damage to the circuit and to the probe point. In most cases if a probe wire becomes bent accidentally, it can be mechanically straightened with no adverse effects on performance. Probe points that have become soiled or dulled can be cleaned and resharpened by shipping the tips back to GGB Industries, Inc.
In addition to the 22 micron tungsten wire with a one micron point, Model 12C tips are available with 10, 35, 60 and 125 micron wires which are sharpened as indicated in the accompanying table.