
Agilent B1500A/B1505A Programming Guide, Edition 11 1-43
Programming Basics
Data Output Format
D (SMU data) Data count. This value is expressed in 17-bit binary data. The measurement data and
the source data can be calculated by the following formula.
Measurement data = Count × Range / 50000
Source data = Count × Range / 20000
where, Count is the D value, and Range is the measurement range or output range
given by C.
If the top bit of D is 0, Count is positive and equal to the value given by the
following 16 bits. If the top bit of D is 1, Count is negative. Calculate Count by
subtracting 65536 (10000000000000000 in binary) from the value given by the
following 16 bits.
Example:
If the output binary data is:
11010110000100111000100000000001
then,
Type: Measurement data (A=1)
Parameter: Current (B=1)
Range: 1 nA=10^(11-20) A (C=01011 in binary, C=11 in decimal)
Count: 5000 (D=00001001110001000)
Status: Normal condition (E=000)
Channel: SMU1 (channel number 1) (F=00001)
Measurement data = 5000 × 1E–9 / 5E+4 = 100 pA
NOTE For the current or capacitance data, Range value can be expressed by the following
formula. This is effective for C ≤ 20, not effective for 21 ≤ C.
Range = 10^(C-20)
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