Keithley 199 Instruction Manual page 14

SECTION 5-Principles of Operation
5.1
INTRODUCTION . . . .._......__._ >.,i_<~r...~ ___r..... 1,__ . . . . . . . . . . . . ..____._..~...... a,>_,,y __,. ;:i~;l,:~;~i~5.1
5.2
OVERALLFUNCTIONALDESCRII'TION ___......_....._... _ .I-., _,_.._.__.__ .__.._. _ .___.. I,_.~.._.,.
5.1
5.3
ANALOG CIRCUITRY.. . _. ..__I __-_ __~_~A __~_I_.. _. _ _ ..,. ii,_,. .~_ _ z _. . :.'I-. _. _ .~.,. _. 5-l
5.3-l
InputSignalConditioning .._.. .._._. _~_I ,._._ 1 . . . . . . ~,I ..-.-. i_i~ . . . . . i _.._ ;.)I'..;~.:.' _.._ i_i_.
5-1
5.32 Multiplexer . ~5-6
5.3.3
-28V Reference Source . ~.
. ~. : .~. : ;.::~. . . . . _ .,-._ / . . . . iii _........__ r.'.;. ______^___ ~_iii_~ ____ ~5.8
513.4~~~ InputBufferAmplifier . . . . . . !.~.I ..____..... _ ..,.......... 2 . . . . . . . . i . . . . . ..__....____ ~_i.,_,.. 5-8
5.4
A/D CONVERTER
.._.....,_. __._,_,_. _~_.~._._~______~..,_ _~.......___....._.___. ..__ ____ ____ i...:.....1=~~5-8
5.5
~~~:CONTROLCIRCUITRY ~.~.~.,.<..;z .__....__. > ,...-,.... i.i..~...~._ . . . . . . . . . . :..:..i~ . .._....
'1. 5-10
5.6 : DIGITALCIRCUITRY .__.____tt__ ::w..~.-. _____,_.: ___,_. _ ,_..______,_ ~ .~_.~______ L ._t____...; ____._,,. ;v_._ 5-10
5.6.1
Microcomputer . . . .._.._.._..____... ~_~i__,ij .,_. Ijj,__,,j' . . . . . . . . . . l_-~._..;_;..: . . . . . . . . z..:;..;..;...
5-10
5.6.2
Display Circuitry . ; _ _ -1-i ,".., I . . . .._. _ ___,_ _ , . . :-.: .;~.-- _. .~_~_ j~l~_l, ;. .~_ .'+z.. .:: :. . . .,. &lO
5.7
POWERSUI'I'LIES _.,__..; .__.__ :..~:.. ._...___ __.. I).~ .._._._ -~.~.-..I...:..;..~ __._.I :._.i _,,.._.__ ~5-IC
5.8 SCANNER . . . . . . . . . .._.._.....~..... ~ ,_______. _...,. L . . .._.-__I_.._, _.I ._..._.... 2 .._...._..__..... 5-10
58.1
c0ntr01cicnilTy . . . . . . . . . ..___. _... -.~..~~-;.~.~-~~,~...~ ,........ ~_.~.i ~....___.....____.. ..,_
_ . . . . . . . . 5-10
5.8.2
Switching Relays . . . . I. _ . _ a~.~. .z: __. i,. i.i. ._ _ . _.i .~:; . i: . . . . I._. _ ) ;~: .~xr:~. . _. . S-11
SECTION 6-Maintenance
6.1
INTRODUCTION
................ .t......_ ... __., i ,a,_ :i..> .: ..i.:.;; .. _'i .... ._I'., ..:....
L.':.-,:,-:-~ ....... 6-l
6.2
LINEVOLTAGESELECTION
............. ..I: ... . ............ ._ .............
i;. .,_,_, -.----T.i~...-..L~~ ..- 6-1
6.3
FUSEREPLACEMENT ..........
~.,.-.; ._ 1.; ..... ;...:.~..:..A:.1 ............ l,i~irl_ii_,i,i.~.ii_._'_1. .... ~61
6.3.1
LineFuse ....................... . ..-L......i.~~..............~:~~~: .....
;~_; .,._ ... . .. ..~~....~..~..11.... ........... 6-1
6.3.2
Current FU se ..................... L .......................
.._ .. i ._.__ f.. ... _ ............... _i ....... 6-2
6.4
CALIBRATION
............. _^__ .. .~.I;~._.~ ........ _._ _ ......... ;: : ........... I..:. .......
c. -.-:.':a; .... 1~: .... 6-2
6.4.1
Recommended Calibration Equipment
...........
;. : ... __ ........ . ........
_,.;, ___ ........................ 6-2
6.4.2
Environmental Conditions ... : . .~; :~.~:::~I. .. ._ _ .~i,l.Lj.l . ._ ...................... ; :. ; __: .......
: ......
:~ 6-3
6.4.3 ..
Warm-UpPeriod.. ...................... :_ili.. .. ~.i. ... . ................................
.: ............. 6-3
6.4.4
CAL Lock Switch ..............
,.,_ _, _ L ., _ ... _yy_~I _ jmj.i .... i .. j i~i ..* :.. _ ....~..~.L~...~. ... i .. _ _ -': ;.r: .z: : . : . ; ..... 6-3
6.4.5 Front Panel Calibration ............
...._: ......... . . ... . ..... . .. ::. ..... I .............................. 6-3
6.4.6 IEEE-488 Bus Calibration ...........................
. ............... :. .. .~.+ ;.. .... .*. ............ 6-4
6.41
Calibration Sequence ..................... ._ ................. _. .....
.,,_ ,, .... _ .. , _._ .. _,_ .; L __ : .. 'L #,,., jl, 6-5
6.4.8 DCVoltsCalibration..
........................
_ . .._ ..... ,__L.__~. ..... ..~.....'....'~~~.i.'.~.......'.:.'.:'.~..l.
6-5
6.4.9
Resistance C&&ration
....................
_ ............ . pi .~i i. .. i:. ...................... ., _:_ ...... _~; . ; 6-6
6.4.10 TRMSACVoltsCalibration ...... ........
L.. .. l.. ................ ....t...ii ..__ _. ..;: ....... _ ....... _ 2, 6-8
6.&
DCC unrent Calibration ......... ~.,~"~.-~ ........ . ..................
__,_._______ ..... .:..~ ........... 6-12
6.5.
TRMS AC Current Calibration ...........
_ .............. i _.__ .._._. _,.,_ .. _~.,: ......... .,_ ...... ..; .... 1': 6-12
DISASSEMBLY INSTRUCTIONS..
.............................
+ ........... . .................. L.. .. ~...6- I3
6.6 SPECIAL HANDLING
............................ __._ ......... ~.~..6-17.
6.7 TROUBLESHOOTING
................
.~:~I ....... ._I,, _ .... ._,__ _._i~_.i_. .... ..i .... L ... ii :..::z:.: ............. I 6-v
67.1 Recommended Test Equipment ..................
,_.,_ ............
Il~_~_~.~i
.....
i_ ..... i .... _'*._ _'wr~_:_ ~6-17
6.7.2 ..
I'owerUpSeIfTest ............. _.._. _._--,.L~.i.~~__~~i,.~ .... ..^ ._ i ........ ;..e_
.._._; _ ...... ~;.;....~6- 17
6.7.3
Diagnostics ............ .._.__ ..................... _. ... ..___ _ i.__._-__.iz~
. ..__ .. -..;..~.:.~..:. 6-l8
6.%4
PowerStipplies.. ....................
_.____.^ .~.........._. .: .__, L___ .... __I ..... .._ ............ 6-18
6.7.5
Signal Conditioning Checks ............
_ _ ....... . .- .... ~=.;. ..... _ ............................ ..L. _._ ...........
6-18
6.76
DigitalandDisplayCircuitryChecks..
..... _._ .... ji,. ............................. . ___._._.__._ 6-18
6.7.7
Scanner Checks.. ..............
.~...~__.__ _ _ ..... ____., i _.___ __w,i_~/. ................ .___.__ ii._i,_i_i 6-18
6.8 ~SCANNERINSTALLATIONANDCHECKOUT.
........
_..i.....l.i.....l.._i_
i ..... .._.
izi,.__ ...... .._ ..
6-22
6.8.1
Installation .......................... _ ............ .___ ,i .......... .._. .....
;.: ._. ...... .;- ........... 6-22
6.8.2
Card Checkout ..................................................... _._& ..................
i ......... 6-23
6.8.3 Relay Shield Jumper ..................
. ............ _. ............ _,_ ...... .__ ___ . _._. ........
; ....
6-24
iv