21
Calbytes
The 9216A calibration is controlled by calibration constants ("calbytes") that the firmware
uses to adjust the impedance calculations. These calbytes are stored in the 9216A RAM.
Recalibration of the 9216A involves determining new values of the calbytes and storing
them in the RAM. The calbyte values that are determined at the time of the 9216A manu-
facture are also stored in ROM and may be recalled at any time. The standard resistor
calbytes are automatically determined by the standard resistor calibration subroutines.
The amplitude calbytes must be manually determined.
The 95 amplitude calbytes, which are one-byte integers in the range of 0 to 255, are
directly adjustable from the front panel and are organized as shown in Table 2-10. The
120 floating point frequency correction, reference resistor values, and open and short cir-
cuit calbyte values, whose organization is given in Table 2-11, are automatically
determined by the 9216A's calibration subroutine. These calbytes cannot be directly
changed from the front panel, but they may be changed via the computer interfaces.
Table 2-10 Organization of Amplitude Calbytes to Amplitude and Frequency
Frequency
Amplitude
100 Hz
120 Hz
1 kHz
10 kHz
100 kHz
0.10 V
0
1
2
3
4
0.15 V
5
6
7
8
9
0.20 V
10
11
12
13
14
0.25 V
15
16
17
18
19
0.30 V
20
21
22
23
24
0.35 V
25
26
27
28
29
0.40 V
30
31
32
33
34
0.45 V
35
36
37
38
39
0.50 V
40
41
42
43
44
0.55 V
45
46
47
48
49
0.60 V
50
51
52
53
54
0.65 V
55
56
57
58
59
0.70 V
60
61
62
63
64
0.75 V
65
66
67
68
69
0.80 V
70
71
72
73
74
0.85 V
75
76
77
78
79
0.90 V
80
81
82
83
84
0.95 V
85
86
87
88
89
1.00V
90
91
92
93
94
Содержание 9216A
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