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The A/D shift register bits used to turn the attenuators off and on are listed
below.
Bit
Position
Name Setting
10 PIGGY1 0 - Ch1 attenuators disabled
1 - Ch1 attenuators enabled
34 ATT20DB 0 - Ch1 20dB input attenuator ON
1 - Ch1 20dB input attenuator OFF
35 CH1POST 0 - Ch1 20dB post attenuator ON
1 - Ch1 20dB post attenuator OFF
37 CH1INT 0 - Ch1 6dB internal attenuator ON
1 - Ch1 6dB internal attenuator OFF
38 CH1INT 0 - Ch1 14dB internal attenuator ON
1 - Ch1 14dB internal attenuator OFF
15 PIGGY2 0 - Ch2 attenuators disabled
1 - Ch2 attenuators enabled
42 ATT20DB 0 - Ch2 20dB input attenuator ON
1 - Ch2 20dB input attenuator OFF
43 CH2POST 0 - Ch2 20dB post attenuator ON
1 - Ch2 20dB post attenuator OFF
45 CH2INT 0 - Ch2 6dB internal attenuator ON
1 - Ch2 6dB internal attenuator OFF
46 CH2INT 0 - Ch2 14dB internal attenuator ON
1 - Ch2 14dB internal attenuator OFF
Measurement
Range
20 dB
Input
Attenuator
bits 34, 42
20 dB
Post
Attenuator
bits 35, 43
Internal Attenuators
6 dB 14 dB
bits
37,45 38,46
-0.10230 to 0.10235 OFF OFF OFF OFF
-0.2046 to 0.2047 OFF OFF ON OFF
-0.5115 to 0.51175 OFF OFF OFF ON
-1.0230 to 1.0235 OFF ON OFF OFF
-2.0460 to 2.0470 OFF ON ON OFF
-5.115 to 5.1175 OFF ON OFF ON
-10.230 to 10.235 ON ON OFF OFF
-20.460 to 20.470 ON ON ON OFF
-51.150 to 51.175 ON ON OFF ON
-102.30 to 102.35 ON ON ON ON
Table C-4. HP E1429 Digitizer Attenuator Settings
Appendix C Register Programming 371