Stanford Research Systems DS335, User Manual

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Calibration 4-17
DS335 Synthesized Function Generator
Now the post amplifier attenuator gains for 50 Ohm case:
40 50_0dB +/- 5% from nominal value of 32768
41 50_2dB +/- 5% from nominal value of 26028.
42 50_4dB +/- 5% from nominal value of 20675.
43 50_6dB +/- 5% from nominal value of 16422.
44 50_8dB +/- 5% from nominal value of 13045.
45 50_10dB +/- 5% from nominal value of 10362.
46 50_12dB +/- 5% from nominal value of 8230.
47 50_14dB +/- 5% from nominal value of 6538.
48 50_16dB +/- 5% from nominal value of 5193.
49 50_18dB +/- 5% from nominal value of 4125.
50 50_20dB +/- 5% from nominal value of 3276.
51 50_22dB +/- 5% from nominal value of 2602.
52 50_24dB +/- 5% from nominal value of 2067.
53 50_26dB +/- 5% from nominal value of 1642.
54 50_28dB +/- 5% from nominal value of 1304.
55 50_30dB +/- 5% from nominal value of 1036.
Spare calbytes (unused):
56 Unused
57 Unused
58 Unused
59 Unused
60 Unused
61 Unused
62 Unused
63 Unused
64 Unused
65 Unused
66 Unused
67 Unused
68 Unused
69 Unused
70 Unused
71 Unused
The following three tables have a length of 160 entries, and contain sine and square wave leveling values and
squarewave symmetry values as a function of frequency.
72 SINE_0 Fixed at 127. This is the reference value for dc.
73 SINE_1 0 to 255. Nominal 127. For 19,531 to 39,062 Hz.
74 SINE_2 0 to 255. Nominal 127. For 39,063 to 58,593 Hz.
:
231
SINE_159 0 to 255. Nominal 127. For 3105468 to 3125000 Hz.
The next table of 160 words contains amplitude leveling data for square wave outputs. This data is used to
modify squarewave amplitude control values as a function of frequency (there is no hardware accommodation
for amplitude leveling of squarewave sweeps.)
232 SQ_0 Fixed at 2^15 (32,768). The dc reference level.
233 SQ_1 For 19,531 to 39,062 Hz. +/-10% from nominal.
234 SQ_2 For 39,063 to 58,593 Hz. +/-10% from nominal.
:
:
391
SQ_159 For 3105468 to 3125000 Hz. +/-10% from nominal.