Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 168 168_23(Model_168_23)
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_ ___-_l_-_-~- ..I_ ---.- __._..- - ._.. - -....
SPECIPICATIONS HDDEL 169-23
SPECIFICATIONS
An a DE-I: Identical t.0 Model 168
As a mAs Heter:
Range: 0 to 1999 millimp-seconda (other ranges selectable with
external shunt resistor)
Accuracy: ?lX of':reading fl digit
Drift: 1 digit in ten seconds
r&t hit: mAs range not to exceed 1999 *a
Maximum current: :W.s range) 3000 ma not to exceed .66 seconds duratia,
Tracking Rate: Greeter then 3000 ma per microsecond for rated sceuraey
2 0375
"ODE,. 168-23 OENEPAL INPORHATION
SECTION 1. GENERAL INFORMATlOi
The Hodel 168-23 OlAa meter is a Model 168.modified by the addition of
integratin,, capability on voltage and current ranges. The Model 168-23
is specifically designed to measure "As on x-ray machines but has a&i-
catio" wherever integrated current or voltage measuremen~a are required.
0375 3
`INITLAL PREPARATION
SECTION 2. INITIAL PREPARATION
Same es 168, however check zero and adjust if necessary.
0375
MODEL 168-23 OPERATING INSTRUCTION:
. .~
SECTION 3. OPERATING INSTRUCTIONS
As a Dm: Place tie-NORM switch to NORMposition. then refec to Hodel
168 mnual for DMH operation.
A.9 a mAs Meter: Refer Lo Model 168 manual for power selection derails.
Place tia-NOPJ4 BViLCh to mAs. For the o-1999 mA8 range,
deprese (DC) and (A). Depress the crane button co reset
the unit Lo 0 "IAS nnd use the erase buccon vhenever a
reeec is desired.
Connection Co X-Rey Machines: The 168-23 tie meter is specifically
designed for use with x-ray machines in the O-1999 mAs range. Ihe S.AS
meter muer be connected in series with the x-ray machine's high voltage
secondary, between the secondary winding and ground. a~ show, in Pigwe
1. Most x-ray machines have labeled ma or ,X,B test points for this
purpose.
r---------i 1
1 -I
FIGURE Connection
1. LO X-Ray High "olc.8~ Secondary
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0PERATTNC INSTRUCTIONS NODEL 168- 23
WARNING
Consult x-ray machine service manual far proper hook up, since
improper connections can result in lethal "oltegea present on the
168-23 and damage to the meter. NEVER c~nnece 168-23 f~ "high"
side of the secondary. This will result in destruction Of the
metet and a dangeraus shock hazard. Never much any part of the
measurement circuit with the hiph "oltaw on.
A,, over voltage pmtectim device should be securely fastened acr0.s~ the
ma or mAe tear pairks externally or internally to protect both machines
and the operator in the event of an open circuit to the mAs meter (i.e..
test lead falling off. blm fuse, etc.). Suitable protection devfces
include power reeietors. spark gaps, etc. Specific i"forn!ntio" concerning
procecrion devices ahcsuld be obtained fram the manufacturer af the x-ray
machine in qut?aLion,
a Shunt Resietor
0 * 199.9 mAs 10 n
0 + 1999 mAa 10
0 * 19990 mAe .l "
Thie technique provides greater safety, olultiple ranges. end f,reatei in-
put overload protectian on rhe 168-23.
6, 0375
HODEL X8-23 OPERATING~
`INSTRUCTIONS
,er Ueee: The 168-23 has 3 usable integrating ranges, as follows:
Function Setting (mAelNOI(N in mAs) Range
mAe (DC) (A) 0 - 1999 *
* 0 - 1.999 mA*
"B I::; (*) 0 - 1.999 "a
NOTE
The low mAs range has 1000 ohm series resistance, and should not be
wed for x-ray lnAa measucements. The volt-second range can be
transformed into an ti range by use of a shunt- resistor.
r--,-- --L--
IO-MEG.
TND,IT
I
HIGH
ICE VOLTAGE I
CCPnYnno"
I
-RAY TUBE
.I
L IiPUT
CONNECTORS I
I
FIGURE 2. Integratin,, "alta~e Node
0375 7
MAINTENANCE HODEL 168-23
._.~ ._.~~
-8ECTIiZIN 4~ilAINTEiViiNCli
Cellbrarian and R&air: Return instrument LO factory aa specified in
168 manual.
8 0375
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