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The DTGM21 is a module from Tektronix. This module is used with Tektronix oscilloscopes to provide more measurement capabilities.
Additional Features:
The DTGM21 with both 50 ohm and 25 ohm source modes, is an improved replacement for the discontinued DTGM20 output module.
4 channels (DTG5078), 2 channels (DTG5274/5334)
5.35 Vp-p (from 23 Ω to 50 Ω)
3.9 Vp-p (50 Ω), 7.8 Vp-p (1 MΩ)
Tr/Tf (20% to 80%) <340 ps (1 Vp-p, into 50 Ω), fixed.
External Tri-state (Hi_Z) control function.