Operator`s manual
7 Signametrics
SMU2055 basic features:
Function SMU2055 DMM
Volts DC; four ranges, 240mV to 240V
Volts AC; TRMS; four ranges, 240mV to 240V
2-Wire Ohms, six ranges 240 to 24 M
4-Wire Ohms, six ranges 240 to 24 M
DC current, four ranges 2.4 mA to 2.4 A
AC current, four ranges 2.4 mA to 2.4 A
Diode V/I Five ranges, 100 A to 1mA
Auto range, Relative
Min/Max, dB and percent deviation functions
High Dynamic range; ±2,400,000 counts
Measurement rate selectable: 0.5 to250 readings/s
2.0 Specifications
The following specifications are based on both, verification of large number of units as well as
mathematical evaluation. The specifications should be considered for the specified environment.
It is important to note that a specified range for a DMM is expressed as a numeric value indicating the
highest absolute measurement that can be displayed using that range. The lowest value that can be
detected is expressed by the corresponding resolution for the range.
2.1 DC Voltage Measurement
Input Characteristics
Input Resistance 240 mV, 2.4 V Ranges: >10 G, with typical leakage of 50pA
Input Resistance 24 V, 240 V Ranges: 10.00 M
Accuracy ± (% of reading + Volts) [1]
Range Full Scale
6-½ Digits
Resolution 24 hours
23C 1C
90 Days
23C 5C
One Year 23C
5C
240 mV 240.0000 mV
100 V 0.003 + 2 V 0.005 + 3 V 0.007 + 3.5 V
2.4 V 2.400000 V
1 V 0.003 + 3 V 0.004 + 4 V 0.005 + 10 V
24 V 24.00000 V
10 V 0.004 + 200 V 0.005 + 250 V 0.007 + 300 V
240 V 240.0000 V
100 V
0.004 + 600 V 0.005 + 800 V
0.007 + 1 mV
[1] With reading rate set to < 2/sec, and within one hour from Self Calibration (S-Cal).
For resolution at higher measurement rates, see the following table. Use this table for DC Volts, DC
Current and Resistance measurements.
Maximum reading rate
Digits of Resolution
1 / second 6-1/2 22 bits
27/second 6 20 bits
250 / second 5-1/2 18 bits
DCV Noise Rejection Normal Mode Rejection, at 50, 60, or 400 Hz ± 0.5%, is better than 95 dB
for Rates of 6rps and lower. Common Mode Rejection (with 1 k lead imbalance) is better than 120
dB for these conditions.