Agilent Technologies B1500A Servisní příručka stáhnout pdf (Strana 69)

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Agilent B1500A/B1505A Programming Guide, Edition 11 1-51

Programming Basics

Data Output Format

D Data count. This value is expressed in 4 bytes binary data. The measurement data

and the output data can be calculated by the following formula.

Resistance or reactance = Count × Range / 2

Conductance or susceptance = Count / (2

× Range)

DC bias output value = Count / 1000

Data other than the above parameters = Count × Range / 1000000

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 31 bits. If the top bit of D is 1, Count is negative. Calculate Count by

subtracting 2147483648 (10000000000000000000000000000000 in binary) from

the value given by the following 31 bits.

Example:

If the output binary data is:

1000000100001011000000000000000110000110101000000000000000000001

then,

Type: Measurement data (A=1)

Parameter: Current (B=0000001)

Range: 1 nA=10^(11-20) A (C=01011 in binary, C=11 in decimal)

Count: 100000 (D=00000000000000011000011010100000)

Status: Normal condition (E=00000000)

ADC: High speed ADC (G=000)

Channel: SMU1 (channel number 1) (F=00001)

Measurement data = 100000 × 1E–9/1E+6 = 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)

For the resistance, reactance, conductance, or susceptance data, Range value can be:

Range = 10^C

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 597 598

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