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Section 5
23
Model 9002
Remote Control Operation
Table 5.6 The $06 Command Setup List
• Byte 4 contains the least significant bits, F7-F0, of the frequency base, a term we will shortly define.
• Byte 5 sets up a number of key parameters:
As Table 5.6 shows, ACT, DIF and DC are the high (1) setting. A low setting (0) stands for BYP, SNG, and AC.
• Byte 6 is the Pre-gain in binary code.
• Byte 7 is the Post-gain in binary code.
5.4.2.2 - Calculating Program Parameters
Programming the filters involves calculating certain specially defined numbers related to frequency and gain. These
calculations are shown step-by-step in this section. Examples are shown with each step to aid your understanding of
the process.
Desired Corner Frequency (DCF)
The Desired Corner Frequency is approximated in the instrument by the Programmed Corner Frequency (PCF). The
PCF is composed of two components:
Range R
Frequency base F
These values are derived from the Desired Corner Frequency such that the following equation is true:
R is the frequency range value .1, 1, 10, or 100 which, when divided into the Desired Corner Frequency, yields the
largest possible number between 1 and 1024.
For example, let us calculate R for a Desired Corner Frequency of 10,638 Hz. Table 5.7 lists the results of dividing
10,638 by 0.1 1, 10, and 100.
Byte # D7 D6 D5 D4 D3 D2 D1 D0
4 F7F6 F5 F4F3F2 F1F0
5 ACT DIF DC R2 R1 R0 F9 F8
6 PRE7 PRE6 PRE5 PRE4 PRE3 PRE2 PRE1 PRE0
7 PO7 PO6 PO5 PO4 PO3 PO2 PO1 PO0
PCF = (F + 1) x R
ACT/BYP function
Selection of SNG or DIF
Choice of AC or DC coupling
Frequency range R2-R0
2 MSBs, F9 & F8, of the base frequency
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