This is an initial overview of the Tektronix DMM4020DMM4020 Bench-top Digital Multimeter.
As you can see from the photo, the DM4020 comes in Tektronix corporate colour. That familiar grey-blue colour which is so often seen around labs. The main body is pressed alloy construction, with plastic front panel. The front and rear both have flexible plastic/rubber protective “boots” which can be removed for rack mounting. As usual with this sort of equipment, there is a tilting bail which can be positioned in a number of angles, used as a carrying handle, or removed entirely. The HRC fuses are of the high quality you would expect, and are accessible by removing a small metal panel underneath the unit. A small plastic box covers the fuses themselves, presumably for insulation and blast containment. They don’t seem as well protected as they are in hand-held meters.
Input bias current: <30pA @ 25C
Input impedance: >10G Ohms (200mV and 2V ranges) 10M Ohms (20/200/1000V ranges)
Resolution on 200mV scale: 1uV
Accuracy: +0.01% of reading + 0.003% of range
Accuracy (all ranges 45Hz – 20kHz): 0.15% of reading + 0.05% of range
1 Ohm (20mA and 200mA)
Accuracy: typ. 2mA scale 0.015% of reading + 0.005% of range
Maximum Crest Factor 3:1 at full scale
Resolution: 20mA scale: 0.1uA (100nA)
Accuracy: Typ. 200mA scale, 45Hz-2kHz: 0.25% of reading + 0.05% of range.
Input protection: 1000V on all ranges
Resolution: 200 Ohm scale : 0.001 Ohm (1 milli-Ohm)
Accuracy: 0.01%
Test current: 1mA