Fluke 8020A - 2-37. OPERATION; 2-39. APPLICATIONS

'mS-to-kn 'nS-to-kfl Find the approximate resistance value using one of
2 mS Range
200 nS Range
(1imS - kn) (1WOInS Mfl)
the scales at left. Then, on the table below, locate
mS kO nS MO
the most significant digit of the display reading on
the vertical
NO. column, and the next digit on the
horizontal
NO. row. The number at the intersecting
coordinates represents the unknown resistance
value. For example, a reading of
52.0 nS is equal to
19.2 Mn. Decimal point location is determined from
the scale approximation.
lnlerpolallon Table (ilno.)
NO. .O .I .2 .3 .4 .5 .6 .7 .8 .9
1 1 ,909
,833 ,769
.714 ,667
,625
,588
,556 ,526
2 ,500 ,476
,455
.435 ,417
,400 .385
.370
.375 ,345
3 ,333 ,323
,313 ,303
,294 ,286
,278 ,270 ,263 .256
4 ,250 ,244 .238 ,233
,227 ,222
.217
.213 ,208
,204
5
.200 ,196
.I92
,187
,185
,182 ,179
.I75 ,172
,169
6 ,167
,164 .I61
,159 ,156 ,154 ,152 -149
,147 ,145
Converslon Scales
7 .I43
.I41
,139 ,137
,135
,133 ,132 ,130
,128 ,127
8 ,125
.I23
,122 ,121
,119
,118 ,116
,115
,114 .I12
S= siemens=l/~=lnternationol unit 9 ,111
.I10
,109 .I08
,106 ,105
,104
,103 ,102
,101
of conductance formerly known as the
mho.
Flgure 2 - 5.
Conductance - to - Resistance Converslon Scales and lnterpolatlon Table
to
10,000 MR. Ordinarily, resistance measurements 2 - 39. APPLICATIONS
within this range are plagued by noise pick - up and
require careful shielding. However, by measuring the
resitance in terms of conductance, common test leads
are adequate for the
8020A to make noise - free
measurements clear up to 10,000 MR. High value
resistors, and low leakage components
(i.e., capacitors,
diodes, etc.) are natural candidates for the 200
nS
conductance range. Refer to applications later in this
section for additional information.
2
- 36.
The 2 ms range, in terms of resistance, starts at
500R and goes up to 1 Ma. It is intended for use in
making either resistance measurements or direct
- reading
dc current gain (beta) measurements on transistors. Beta
measurements require the use of a special test fixture, and
are discussed later in this section under applications.
2 - 37. OPERATION
2 - 38.
Operation of the
8020A is an easy four step
process:
a.
Set the power switch to ON.
b.
With reference to Figure 2 - 6, set the range and
function switches for the desired measurement.
c.
Connect the test leads to the appropriate input
terminals. See Figure 2
- 6.
d. Contact the input signal and read the display.
2 - 6
2 - 40. The test applications described in the following
paragraphs are suggested as useful extensions of the
8020A measurement capabilities. However, they are not
intended as the equivalent of manufacturer's recom
-
mended test methods. But rather, are intended to
provide repeatable and meaningful indications which
will allow the operator to make sound judgements
concerning the condition of the device tested;
i.e., good,
marginal, or defective.
Uu the Wlowlng Imbk to Idmtlfy Ihe dnlred m*a#urement column. and ul me
pushbutton swltch*~ n Indicated (see noles). Connecl lest laads lo proper lnpul
mrmlnals.
NOTES:
= IN (Conduclence (llfl) ranges requdre depression ol two range swllches
simultaneously)
- = OUT
0 = DEPRESS ONE TO SELECT DESIRED RANGE
HI = RED. HIGH INPUT LEAD
LO = BLACK. LOW INPUT LEAD
Figure 2 - 6. Selecting a Functlon and Range
8/77