HP 3478A Technical Manual page 33

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3478A

3-116. Fast

3-116.

Fast Trigger

Trigger. . This trigger

selected over the HP-IB.

selected over

the HP-IB. It is th

Trigger, except the delays in the AC Volts Function, AC

Current Function, and the high Ohms Ranges are

omitted.

omitted. The mode can be

The mode can be selected by

codes "TS".

3-117. Advanced

3-117.

Advanced Programming

Programming

3-118.

General.

The following

The

advanced

advanced programming

programming information

includes Extended Ohms Operation, Reading the Binary

Status Byte, and Reading the Error Register. 3-119.

Extended Ohms Operation.

Extended

Ohms Operation. This operation

is only available over the HP-IB and is used to measure

resistance above 30M ohm.

resistance above

30M ohm. The function is

sending program code "F7" or "H7" (Home Command,

see

see paragraph 3-110

paragraph 3-110). ). The 3478A

Ohms Function and the 30M

Ohms Function and

the 30M ohm Range.

resistor is

resistor is connected in p

connected in parallel with

the resistance first and then measure the unknown

resistance.

The unknown

The

unknown resistance

calculated by this formula:

Rx =

where Rx is the unknown resistance, Ri is the measured

10M ohm resistor, and Rt is the measured value of the

parallel combination.

3-120.

3-120. Reading the

Reading the Binary

Binary Status By

status (or state) of the 3478A can be determined by

reading its Binary Status Byte.

reading its Binary

Status Byte. The total number of bytes

is five, with each byte 8 bits wide.

is five, with each b

yte 8 bits wide. The bytes can be read

by sending program code "B" to the 3478A and then

reading its output.

reading its

output. A small program to

A small program to read the out

using the -hp- Model 85 Personal Computer is as

follows:

10 OUTPUT 723 ;"B"

20 ENTER 723 USING "5(IB)" ;BI,B2,B3,B4,B5

The bytes are in variables

The bytes a

re in variables B1, B2, B3, B4

bytes and corresponding meanings of the bits (when

true) are in

true) are in Table 3-7.

Table 3-7.

Error Register (byte 4; see Table 3-7)

Error Register (byte 4; see

3-121.

Reading the

Reading

the Error

Error Register.

Binary Status Byte 4 (see previous paragraph), the

status of the Error Register can also be determined by

sending program code "E" to the 3478A and then reading

sending program code "E" to the

its output.

its out

put.

The outp

The output is

ut is a tw

followed by a

followed by a carriage return a

carriage return and line feed.

shows which bit(s) of the register is true (a two digit

number can be used since only 6 bits are used by the

in octal "41" (the maximum value is "77").

in octal "41" (t

he maximum value is "77"). Refer to

3-7 (byte

3-7

(byte 4) for

4) for the definition

the definitions of the

This trigger mode ca

mode can only

n only be

It is the same as the

e same as the Single

selected by sending program

sending program

following paragraphs

paragraphs have

information for

for the

the 3478A.

3478A.

This operation (or function)

(or function)

The function is selected by

selected by

The 3478A is set

is set to t

to the 2-Wire

he 2-Wire

ohm Range. A 10M ohm

A 10M ohm

arallel with the input.

the input. Measure

Measure

resistance can

can then

then be

Ri * Rt

Ri - Rt

Status Byte.

te. The

The current

The total number of bytes

The bytes can be read

read the output

B1, B2, B3, B4, and B5.

, and B5. The

Program Code "B" clears the

Table 3-7). .

Besides using

Besides

3478A and then reading

a two digit

o digit octal numbe

octal number r

nd line feed. The number

The number

are true which results

Refer to Table

s of the bits.

bits. The Error

The Error

Single

Table 3-7.

Table 3-7. Binary Stat

B B y y t t e e # #

1 1

XXX X X X X X X0

XXX X X X X X X1

have

XXXO

It It

XXX0

XXX1

X X X X X X 1 1 1 1 0 0 X X X X

X X X X X X 1 1 1 1 1 1 X X X X

0 0 0 0 1 1 X X X X X X X X X X

0 0 1 1 0 0 X X X X X X X X X X

011X

100X

101X

110X

111X

2 2

current

3 3

put

The

4 4

using

Table

5 5

3-14

Binary Status Byte

us Byte Definition

D D e e f f i i n n i i t t i i o o n n

B B i i t t s s

F F u u n n c c t t i i o o n n , , R R a a n n g g e e , , a a n n d d N N u u m m b b e e r r O O f f D D i i g g i i t t s s

T T r r u u e e

D D i i s s p p l l a a y y e e d d

X01 1

5 1

5 1/2 D

/2 Dig igit its D

s Di i sp

spla laye

yed d

X10 0

4 1

4 1/2 D

/2 Dig igit its D

s Di i sp

spla laye

yed d

X11 1

3 1/2 D

3 1

/2 Dig igit its D

s Di i sp

spla laye

yed d

XO01

01XX

30mV DC

mV DC, 300

, 300mV AC, 30 Ohm

mV AC, 30 Ohm, , 30

DC, or Extended Ohms Ranges

X010

10XX

300m

0mV D

V DC,

C, 3V

3V AC

AC, 30

X011

11XX

3V DC

DC, 3

, 30V

0V AC

AC, 3

, 3K O

K Ohm

X100

00XX

30V D

V DC,

C, 30

300V

0V AC

AC, 30

, 30K O

X101

01XX

300V

0V DC

DC, 3

, 300

00K K Oh

Ohm m Ra

3 3 M M O O h h m m R R a a n n g g e e

3 3 0 0 M M O O h h m m R R a a n n g g e e

D D C V

C Vo o l l t t s F

s Fu u n n c c t t i i o o n n

A A C V

C Vo o l l t t s F

s Fu u n n c c t t i i o o n n

1XX X X X XX

2- 2-W W ir ire O

e Ohm

hms F

s Fu u nc

ncti tion

0XX X X X XX

4- 4-W W ir ire O

e Ohm

hms F

s Fu u nc

ncti tion

1XX X X X XX

D D C C C C ur urre ren n t F

t Fun

unct c ti i on

0XX X X X XX

A A C C C C u u rr rren

ent F

t Fun

unct c tio ion n

1XXX

XXXX

Exte tend

nded

ed Oh

Ohms

ms Fu

Func

B B i i t t # # = = 1 1

I I n n s s t t r r u u m m e e n n t t S S t t a a t t u u s s B B i i t t s s

0 0

I I n n t t e e r r n n a a l l T T r r i i g g g g e e r r E E n n a a b b l l e e d d

1 1

A A u u t t o o r r a a n n g g e e E E n n a a b b l l e e d d

2 2

A A u u t t o o z z e e r r o o E E n n a a b b l l e e d d

3 3

3 3 4 4 7 7 8 8 A A s s e e t t f f o o r r 5 5 0 0 H H z z O O p p e e r r a a t t i i o o n n

4 4

F F r r o o n n t t / / R R e e a a r r S S w w i i t t c c h h i i n n F F r r o o n n t P

5 5

C C a a l l i i b b r r a a t t i i o o n n R R A A M M E E n n a a b b l l e e d d

6 6

E E x x t t e e r r n n a a l l T T r r i i g g g g e e r r E E n n a a b b l l e e d d

7 7

A A l l w w a a y y s s Z Z e e r r o o ( ( n n o o t t t t r r u u e e ) )

B B i i t t # # = = 1 1

S S R R Q Q M M a a s s k k

0 0

D D at ata a R R e e ad

ady y - - SR

SRQ Q fo for r e e ve

HP-IB

1 1

N N o o t t u u s s e e d d

2 2

S S y y n n t t a a x x E E r r r r o o r r - - S S R R Q Q i i f f S S y y n n t t a a x x E E r r r r o o r r o o c c c c u u r r s s

3 3

I I n n t t e e r r n n a a l l E E r r r r o o r r - - S S R R O O i i f f H H a a r r d d w w a a r r e e E E r r r r o o r r o o c c c c u u r r s s

4 4

F F r r o o n n t t P P a a n n e e l l S S R R Q Q - - S S R R Q Q I I f f S S R R Q Q b b u u t t t t o o n n i i s s p p r e r es s s s e e d d

5 5

C C a a l l i i b b r r a a t t i i o o n n E E r r r r o o r r - - S S R R O O i i f f C C A A L L p p r r o o c c e e d d u u r r e e f f a a i i l l e e d d

6 6

A A l l w w a a y y s s Z Z e e r r o o ( ( n n o o t t t t r r u u e e ) )

7 7

P P o o w w e e r r - - O O n n S S R R Q Q - - P P O O N N S S R R Q Q s s w w i i t t c c h h o o n n l l a a s s t t

power was turned on or DCL message was received

B B i i t t # # = = 1 1

I I n n t t e e r r n n a a l l E E r r r r o o r r I I n n f f o o r r m m a a t t i i o o n n

0 0

S S e e t i

t if a

f an n y y o o f t

f th h e C

e Ca a l l i i b b r r a a t t i i o o n R

incorrect checksums or if a range with an Incorrect

checksum is selected

1 1

T T h h e e M M a a i i n n C C P P U U R R A A M M S S e e l l f f - - T T e e s s t t h h a a s s f f a a i i l l e e d d

2 2

T T h h e e C C o o n n t t r r o o l l R R O O M M S S e e l l f f - - T T e e s s t h

3 3

A A n n A A / / D D S S l l o o p p e e E E r r r r o o r r w w a a s s d d e e t t e e c c t t e e d d

4 4

T T h h e e A A / / D D h h a a s s f f a a i i l l e e d d i i t t s s I I n n t t e e r r n n a a l l S S e e l l f f - - T T e e s s t t

5 5

A A f a f ai i l l u u r r e e i i n t

n th h e A

e A/ D

/ D l l i i n n k (

6 6

A A l l w w a a y y s s Z Z e e r r o o

7 7

A A l l w w a a y y s s Z Z e e r r o o

B B i i t t s s

A A / / D D D D A A C C V V a a l l u u e e

0 0 -7 -7

A A de

deci cima

mal l va

val l ue

ue b b e e tw

setting of the internal D

setting of th

e internal Digital to Ana

(DACI).

(Refer to

(Refer to this manua

Information.)

TM 11-6625-3071-14

Definition

300m

0mA A AC

AC or or

, 300 Oh

0 Ohm, 3

m, 3A A

A AC o

C or D

r DC R

C Ran

ange

ges s

hm Ra

Rang

nges

K Ohm

hm Ra

Rang

nges

Rang

nges

ncti tion

t Po o s s i i t t i i o o n n

very ry a a v v ai aila lab b le le re rea a di din n g t

g to o th the e

t ti i m m e e

n RA A M l

M lo o c c a a t t i i o o n n s h

s ha a v v e e

t ha a s s f f a a i i l l e e d d

k (b b e e t t w w e e e e n n U U 4 4 0 0 3 a

3 an n d U

d U4 4 6 6 2 2 ) )

twe e en

en 0 0 to to 63

63 re rep p re res s e e nt nts s th the e

igital to Analog

log Converter

Converter

this manual's Secti

l's Section VII

on VII for

for

HP 3478A Technical Manual page 33

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