Bk-precision 889B - Manual Manual do Utilizador descarregar pdf (Página 20)

1101

1110

1111

Auto-Ranging

Bit 17

0 Short Cal Short Cal

1 Open Cal Reserved

Bit 21 – Bit 18

Measurement Modes

0000 Reserved

0001 LCR

0010 DCV

0011 ACV

0100

Diode

0101 Continuity

0110

DCA

0111 ACA

Others Reserved

Bit 23 – Bit 22

Reserved

For example: if LCR function, Cp with D measurement mode is selected in Auto-ranging with Relative and

Open/Short Calibration are turned off and test signal is 1 Vrms in 1 KHz, then the command is as following:

MOD 000001111110001011010010

2. The results of the measurement that will be sent from the 889B to a remote PC will be packed in either

7-byte or 11-byte format.

When dual data (such as Cp with D) will be sent, the data is packed in 11-byte format shown as following:

Lead_code1 : 02

Lead_code2 : 09

Data_code : 8-byte long; two 32-bit floating point number format; the first 4-byte is the main reading (Cp)

and the second 4-byte is the secondary reading (D)

Checksum : -((02+09+data_code) && 0x00FF)

M-B0

M-B1

M-B2

M-B3

S-B0

S-B1

S-B2

S-B3

where M-Bx and S-Bx are the four bytes floating point format of main and secondary reading which is sent

from the lowest byte first.

When only main reading (such as DCR) will be sent, the data is packed in 7-byte format described below:

Lead_code1 : 02

Lead_code2 : 03

Data_code : 4 bytes long; the 32-bit floating point format of the main reading

Checksum : -((02+03+data_code) && 0x00FF)

M-B0

M-B1

M-B2

M-B3

When only secondary reading (such as DCV) will be sent, the data is packed in 11-byte format described

below:

Lead_code1 : 02

Lead_code2 : 09

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 34 35

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