Bit

Name

 

Function

Bit

Name

 

 

Function

 

 

 

 

 

 

0

ENSYNC1

Enable Ext1 output

26

OPENINH

Input protection inhibit

 

 

 

 

 

 

 

 

1

ENSYNC2

Enable Ext2 output

27

TESTLEDS

LED test

 

 

 

 

 

 

 

 

 

 

 

2

ENEXT1

Enable Ext1 input

28

not used

 

 

 

 

 

 

 

 

 

 

 

 

 

3

ENEXT2

Enable Ext2 input

29

not used

 

 

 

 

 

 

 

 

 

 

 

 

 

4

CALSELA

Lower bit of cal source select

30

not used

 

 

 

 

 

 

 

 

 

 

 

 

 

5

CALSELB

Upper bit of cal source select

31

not used

 

 

 

 

 

 

 

 

 

 

 

 

6

TERM75 1

0

- Ch1 input impedance 50Ω

32

CH1HCAL

0

- switches H_CAL to ch1 +input

 

 

1

- Ch1 input impedance 75Ω

 

 

1

- switches HI to ch1 +input

 

 

 

 

 

 

 

7

SINGEND1

0 - Ch1 S/E input disabled

33

CH1LCAL

0

- switches L_CAL to ch1 -input

 

 

1

- Ch1 S/E input enabled

 

 

1

- switches LO to ch1 -input

 

 

 

 

 

 

 

8

DUMMY1

Ch1 dummy load select

34

ATT20DB

0

- Ch1 20dB input attenuator ON

 

 

 

 

 

 

1

- Ch1 20dB input attenuator OFF

 

 

 

 

 

 

 

 

9

FILTER1

0

- Ch1 filter disabled

35

CH1POST

0

- Ch1 20dB post attenuator ON

 

 

1

- Ch1 filter enabled

 

 

1

- Ch1 20dB post attenuator OFF

 

 

 

 

 

 

 

 

10

PIGGY1

0

- Ch1 attenuators disabled

36

CH1INPT

0

- Ch1 differential input enabled

 

 

1- Ch1 attenuators enabled

 

 

1

- Ch1 differential input disabled

 

 

 

 

 

 

 

 

11

TERM75 2

0

- Ch2 input impedance 50Ω

37

CH1INT

0

- Ch1 6dB int attenuator ON

 

 

1

- Ch2 input impedance 75Ω

 

 

1

- Ch1 6dB int attenuator OFF

 

 

 

 

 

 

 

12

SINGEND2

0 - Ch2 S/E input disabled

38

CH1INT

0

- Ch1 14dB int attenuator ON

 

 

1

- Ch2 S/E input enabled

 

 

1

- Ch1 14dB int attenuator OFF

 

 

 

 

 

 

 

 

 

13

DUMMY2

Ch2 dummy load select

39

not used

 

 

 

 

 

 

 

 

 

 

 

 

14

FILTER2

0

- Ch2 filter disabled

40

CH2HCAL

Ch2 - see bit 32

 

 

 

1

- Ch2 filter enabled

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

PIGGY2

0

- Ch2 attenuators disabled

41

CH2LCAL

Ch2 - see bit 33

 

 

 

1- Ch2 attenuators enabled

 

 

 

 

 

 

 

 

 

 

 

 

 

16

CAL1A(0)

Ch1 cal address line 0

42

ATT20DB

0

- Ch2 20dB input attenuator ON

 

 

 

 

 

 

1

- Ch2 20dB input attenuator OFF

 

 

 

 

 

 

 

17

CAL1A(1)

Ch1 cal address line 1

43

CH2POST

0

- Ch2 20dB post attenuator ON

 

 

 

 

 

 

1

- Ch2 20dB post attenuator OFF

 

 

 

 

 

 

 

18

CAL1A(2)

Ch1 cal address line 2

44

CH2INPT

0

- Ch2 differential input enabled

 

 

 

 

 

 

1

- Ch2 differential input disabled

 

 

 

 

 

 

 

19

CAL1A(3)

Ch2 cal address line 3

45

CH2INT

0

- Ch2 6dB int attenuator ON

 

 

 

 

 

 

1

- Ch2 6dB int attenuator OFF

 

 

 

 

 

 

 

20

CAL1EN

Ch1 cal enable

46

CH2INT

0

- Ch2 14dB int attenuator ON

 

 

 

 

 

 

1

- Ch2 14dB int attenuator OFF

 

 

 

 

 

 

 

 

 

21

CAL2A(0)

Ch2 cal address line 0

47

not used

 

 

 

 

 

 

 

 

 

 

 

 

22

CAL2A(1)

Ch2 cal address line 1

48 - 49

HCALMUX

Bits: 49/51

48/50

 

 

 

 

 

 

Output

 

0

0

GND

23

CAL2A(2)

Ch2 cal address line 2

 

 

50 - 51

 

 

0

1

+10V REF

 

 

 

 

LCALMUX

 

1

0

+1V REF

 

 

 

 

 

Output

 

1

1

CALSIG

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

352 Register Programming

Appendix C

Page 352
Image 352
HP E1429A manual Bit Name Function