Table
3-3.
Limits for
AC
Voltage Verification
197 AC
Range
200rnV
2v
20
v
200
v
750 V
Applied
AC Voltage
200.000rnV
2.00000v
20.0000v
200.000v
7 50. OOOV
20Hz
197.900
to
202.100
1.97900
to
2.02100
19.7900
to
20.2100
197.900
to
202.100
739.63
to
760.37
50Hz
199.200
to
200.800
1.99200
to
2.00800
19.9200
to
20.0800
199.200
to
200.800
743.37
to
755.62
3.5.3
Resistance Accuracy Check
Resistance verification is performed by connecting known,
precise resistance values to the
HI
and
LO
input terminals and
checking to see that the displayed reading is within the re-
quired limits. Measurements on the
2OOQ,
2kQ
and 2Okn
ranges will be done using the 4-terminal configuration to
minimize errors due to the voltage drop across the test leads.
CAUTlO
N
Do not exceed 450VDC
or
peak AC
for
10
seconds per minute, 350V rms continuous
between the HI and
LO
INPUT terminals or
the instrument might be damaged.
1.
Select the ohms function (AC/DC button must be out) and
the
2003
range.
2. Use Kelvin test leads (e.g. Keithley Model
1641)
in the in-
put
HI
and
LO,
and then
OHMS
SENSE
HI
and
LO
ter-
minals. Short the leads together. Enable the relative (REL)
mode. Check to see that the display reads
000.000.
Leave
the relative mode enabled for the remaining resistance
measurements.
3.
Connect
a
1903
calibration resistor as shown in Figure
3-3.
Note that the 4-terminal configuration is
used
for this
measurement.
4.
Check to see that the displayed reading is within the
limits specified in Table
3-4.
10kHz
198.600
to
201.400
1.98600
to
2.01400
19.98600
to
20.1400
199.860
to
201.400
740.50
to
759.50
2OkHz
196.750
to
203.250
1.96750
to
2.03250
19.6750
to
20.3250
196.750
to
203.250
50kHz
189.600
to
210.400
1.93600
to
2.06400
19.3600
to
20.6400
193.600
to
206.400
100kHz
189.600
to
210.400
1.93600
to
2.06400
19.3600
to
20.6400
5.
Connect
a
1.9kn
calibration resistor
to
the
instrument
as
shown in Figure
3-3.
Switch the instrument to the
2kfl
range. Verify that the displayed reading is within the
limits specified in Table
3-4.
6.
Connect a 19kO calibration resistor to the instrument as
shown in Figure 3-3. Switch the instrument to the 20k3
range. Verify that the displayed reading is within the limits
specified in Table 3-4.
7.
Connect a 190kn calibration resistor to the instrument as
shown in Figure 3-4. Switch the instrument to the 200k3
range. Verify that the displayed reading is within the limits
specified in Table 3-4. Note that the 2-terminal configura-
tion may be used on the 2OOkn and higher ranges.
8.
Continue with each of the calibration resistance values
listed in Table 3-4. Be sure to place the Model
197
on the
correct range for each measurement. The remaining
readings may be done using 2-terminal configuration.
Table
3-4.
Limits for Resistance Verification
197 Range
;j:
200
k
20M
200M
Applied
Resistance
Allowable Readings
I
(18OC to 28OC)
190.000
n
1.90000
kQ
19.0000
k!J
190.000
kQ
1.9OOOOMfl
19.0000Mn
190.000Mn
189.959
to
190.041
1.89964
to
1 .go036
18.9949
to
19.0051
189.949
to
190.051
1.89931
to
1.90069
18.9770
to
19.0230
186.199
to
193.801
3-3
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