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The Tektronix DM44 is a digital multimeter module that attaches to the top of the 464, 465, 466, and 475. It replaced the DM40 and DM43. It is a 3½ Digit Multimeter.


DC V Range 0 to 1.2kV in 5 Steps
DC V Resolution 100μV
DC V Accuracy 0.1% of reading, ±1 Count
DC V Input Resistance 10MΩ, Removable internal wire strap to increase input resistance to 1000MΩ on 200mV and 2V Ranges
DC V Maximum Input Voltages, All Ranges ±1200V (DC + Peak AC) Between Positive input and Common input/Chassis
DC V Maximum Floating Voltage on COMMON ±500V (DC + Peak AC) to Chassis
Resistance Range 0 to 20MΩ in 6 Ranges
Resistance Resolution 0.1Ω
Resistance Accuracy 200Ω and 2kΩ Range within 0.25%, ±1 count + Probe Resistance
Resistance Accuracy 20kΩ,200kΩ and 2MΩ Ranges within 0.25%, ±1 count
Resistance Accuracy 20MΩ Range within 0.30%, ±1 count
Resistance Response Time 200Ω and 200kΩ Range Within 1 Second
Resistance Response Time 2MΩ and 20MΩ Range Within 5 Seconds
Temperature Range (with HP6430Probe) -55 °C to +150 °C