IBM Car Amplifier 7220 Manual de usuario descargar pdf (Pagina 110)

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Chapter 6, COMPUTER OPERATION

NC Clear and reset curve buffer

CBD 49180 Stores Magnitude, Phase, Sensitivity and Frequency

(i.e. bits 2, 3, 4, 14 and 15)

LEN 100 Number of points = 100

STR 100 Store a point every 100 ms - must match SRATE parameter

The data may now be acquired by issuing the compound command:

TD; SWEEP 1 Starts sweep and curve acquisition

Note that the order of these two commands is important. If used as shown then the

data will be acquired and then the oscillator frequency will be changed at each data

point, prior to waiting the time set by the SRATE and STR commands. This gives

sufficient time for the instrument output to stabilize after each change of frequency.

If the commands were used in the reverse order (i.e. SWEEP 1; TD) then the

output(s) would never have time to settle by the time at which they were recorded.

The frequency sweep starts and the magnitude and phase outputs are recorded to the

curve buffer. As it runs the M command reports the status of the acquisition, and

once this indicates it is complete (i.e. parameter 1 = 0, parameter 2 = 1), the acquired

data may be transferred to the computer using:

DC. 2 Transfers Magnitude curve

DC. 3 Transfers Phase curve

DC 14 Transfers Reference frequency - lower 16 bits

DC 15 Transfers Reference frequency - upper 16 bits

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 154 155

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IBM Car Amplifier 7220 Manual de usuario Pagina 110