Datasheet
www.tektronix.com/dmm4050_4040 5
Digital Multimeters – Tektronix DMM4050 and DMM4040
Electrical Specifications
DCVoltage Specifications
Accuracy specifications are valid for 6½ digit resolution mode after at least a 1 hour warm-up
with Auto Zero enabled.
24-hour specifications are relative to calibration standards and assume a controlled
electromagnetic environment per EN 61326-1:2000-11.
Characteristic Description
Maximum Input 1000 V on any range
Common Mode
Rejection
140 dB at 50 or 60 Hz ±0.1% (1 kΩ unbalance)
Normal Mode Rejection 60 dB for NPLC of 1 or greater with analog filter off and
power line frequency ±0.1%
100 dB for NPLC of 1 or greater with analog filter on and
power line frequency ±0.1%
Measurement Method Multiramp A/D
A/D Linearity 0.0002% of measurement + 0.0001% of range
Input Bias Current <30 pA at 25 °C
Auto-zero Off Operation Following instrument warm-up at calibration temperature
±1 °C and less than 10 minutes, add error: 0.0002%
range additional error +5 μV
Analog Filter When using the analog filter, specifications are relative
to within one hour of using the ZERO function for that
range and NPLC setting
DC Ratio Accuracy is ±(Input accuracy + Reference accuracy),
where Input accuracy = DC Voltage accuracy for the HI
to LO Input (in ppm of the Input voltage), and Reference
accuracy = DC Voltage accuracy for the HI to LO
(Sense) Reference (in ppm of the Reference voltage)
Settling Considerations Measurement settling times are affected by source
impedance, cable dielectric characteristics, and input
signal changes
Input Characteristics
Range Resolution Resolution Input Impedance
4½ Digits 5½ Digits 6½ Digits
100 mV 100.0000 mV 10 μV 1 μV 100 nV 10 MΩ or >10 GΩ*
2
1 V 1.000000 V 100 μV 10 μV 1 μV 10 MΩ or >10 GΩ*
2
10 V 10.00000 V 1 mV 100 μV 10 μV 10 MΩ or >10 GΩ*
2
100 V 100.0000 V 10 mV 1 mV 100 μV 10 MΩ ±1%
1000 V 1,000.000 V 100 mV 10 mV 1 mV 10 MΩ ±1%
*
2
Inputs beyond ±14 V are clamped through 200 kΩ typical. 10 MΩ is default input impedance.