Digital PDFs

MAINDEC-08-D6GC-D

December 1968

18 pages

Original

0.7MB

Document:	AD Calibration Check
Order Number:	MAINDEC-08-D6GC-D
Revision:
Pages:	18
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-08-d6g/maindec-08-d6gc-d.pdf

OCR Text

IDENTIFICATION
Product Code:

MAINDEC-08-D6GC-D

Product Name:

A/D Calibration Check

Date Created:

October 14, 1968

Maintainer:

Diagnostic Group

Author:

J. Hittell

ABSTRACT

The A/D Calibrat ion check for the converters is to be used to ascertain the accuracy of converter adjustments.

This tape

be used with an adjustable voltage source.

The converted value wil

be displayed in the AC, and the switch register will be used to select multiplexer channels,
of these checks do not guarantee

(Passing

100% monotonicity, steady state accuracy, since all of the 4096 pos-

sible conditions are not checked.)

REQUIREMENTS

2.1

Equipment

PDP-8, PDP-8/I or 8/S Standard Computer

A/D Converter
Adjustable Voltage Source (0.01% or better,

2.2

2c2,

Z out <

Program Storage - The routine uses memory from address 100 to 650 and location 0 and

LOADING PROCEDURE

3.1

Methods
Procedure for normal binary tape should be followed.

STARTING PROCEDURE
For normal operation all switches should be down.
Starting address is:

4.1

Storage

00 for AF01

102 for ADC1

Program and/or Operation Action

Connect voltage source to input connector.
Load the program into memory.
Set switch register to Starting Address.

Load Address.
Select multiplexer channel using switch register 6 to 1 1 =

(AF01 only)

Press Start.

OPERATING PROCEDURE
Set the voltage source to the voltage desired, inspect the AC for the correct converted

value,
For Starting Address 102

SR = Conversion Display Time

SA 103 Routine for Setting Multiplexer

SR = Channel

SA 104 Routine for Incrementing Multiplexer

SR = Channel except for overflow

which should = zero

If alignment errors

are severe the converter should be recalibrated.

See maintenance

section in A-D Converter manual.

Error Halts

6.1.1

Halt (PC)

Function Being Checked

AF01

ADC1

203
207
215

407
413

Flag cleared by Start Key

421

221

425

230
240
250
263

-----

Convert Instruction sets the flag
Read Buffer Instruction clears the flag
Clear Multiplexer, sets the flag

271

—
—
445
434

Buffer initialized by Start Key

Set Multiplexer, sets the flag

Index Multiplexer, sets the flag
Interrupt Up

Interrupt Down

For more information see listing,

RESTRICTIONS

None

MISCELLANEOUS

PROGRAM DESCRIPTION

This routine
bits
It

6 to

After a delay checks to see if a new multiplexer channel

AC.

Word Length
(No. of Bits)

* ± 1/2

Uses the switch register,

as the desired multiplexer channel, converts the voltage on the selected channel.

the AC.

in the

checks both the interrupt and conversion done flags.

Max. Switching
Point Error *

Of INPUT Voltage Rang e

±1.6%

±0.8%

±0.4%

±0.2%

±0.1%

±0.5%

±0.025%

LSB for quantizing error.

Displays

selected, converts, displays

9/14/oa 5:13,55

PAGE

/PQP-o A/0 CALIBRATION
/

/A/D CCK VEr< yLh ENtRaNCE ADDRESS
7 4

01/0
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01/3
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/SR EQUAL CONVERSION TIME
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1

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MAINDEC EVALUATION REQUEST
After sufficient familiarization with the operation and documentation of this MAINDEC,
please indicate your assessment of the following areas and return this form to Digital Equipment Corporation.

IDENTIFICATION

USAGE: Used by:

Field Service

Frequency of Usage:

QJ Production

Daily

—

_ Program Title

MAINDEC NO.__

—

Other

Monthly

Weekly

SUGGESTIONS FOR IMPROVEMENT
1.

Are the program loading and operating instructions: clear ?

(3 incomplete?

difficult to
j

follow ?
(

in all

Do the error reports and program documentation provide sufficient diagnostic information:

cases

most cases ?

very few cases

the program effective in isolating malfunctions:

in all cases

Suggestions for improvement:

most cases?

very few cases
Suggestions for improvement:

Would additional Scope loops or Switch Register control be helpful ?.

Does the program ever fail to detect malfunctions exposed by other software ?.
Please describe malfunction in detail

Were Margins used ?

Does the program ever report non -existant malfunctions ?
Please indicate erroneous report and any pertinent operating conditions:

Does this MAINDEC ever expose malfunctions in the Central Processor or other peripheral units not
detected by the appropriate MAI N DEC ?
Please describe malfunction and MAINDEC(S) used:

—

Does the document provide a general understanding of the functional programming requirements of
NoneQl , Would a general description of programming reGoodjj Fairp~|,

the system ?

quirements increase the effectiveness of thisMAINDEC ?

Remarks:

—

Do Not Tear - Fold Here and Staple

BUSINESS REPLY MAIL

NO POSTAGE STAMP NECESSARY IF MAILED IN THE UNITED STATES

Digital Equipment Corporation

Software Quality Control
Building 12
16 Main Street
Maynard, Mass, 01754