Table C-4. HP E1429 Digitizer Attenuator Settings

Measurement

20 dB

20 dB

Internal Attenuators

Range

Input

Post

6 dB

 

14 dB

 

Attenuator

Attenuator

 

bits

 

bits 34, 42

bits 35, 43

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

 

 

 

 

 

 

 

 

 

 

 

 

The A/D shift register bits used to turn the attenuators off and on are listed below.

Bit

Name

 

Setting

Position

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

Appendix C

Register Programming 371

Page 371
Image 371
HP E1429A manual Input Post 14 dB Attenuator Bits Bits 34 Bits 35 37,45 38,46