Dc Current Verification - Keithley 199 Instruction Manual

PERFORMANCE
VERIFICATION
Table 4-4. Limits for Ohms Verification
set up
Figure 4-3
Figure 4-3
Figure 43
Figure 4-4
Figure 4-4
Figure 4-4
Figure 4-4
190.000 kO 189.948 to 190.052
1.9OOOOMQ 1.89940 to 1.9oo60
19.0OGlMQ
'lg.9767 to 19.0233
lCO.CGOMIt 97.995 to 102.005
4.54 DC Current Verification
With the instrument set to 5%d resolution, verify the DC
Resistance
current function as follows:
Sense PHI
Calibrator
sense LO
I Model S45OA
- ou@"tLO '
MODEL ISO
CAUTION
Do not exceed 3A to the AMPS and LO input ter-
minals or the front panel current fuse will blow.
1
" .,,, ., .,
Figure 4-3. Connections for Ohms Verification
1. Select the DC4 function and autoranze.
2. Connect the DC~ctieW calibration s&ce to the Model
. -
199asshownmF~gure43.
3. Set the calibration source to output +3OmA and verify
that the reading is within the limits listed in Table 4-5.
4. Repeat the procedure for the 3A range by applying the
DC current level listed in Table 45. Check to see that
the reading is within the limits listed in the table.
5.~ Repeat the procedure for each of the two ranges with
negative current levels.
Table 4-5. Limits for DC Current Verification
Applied Allowable Readings
DC CUrrent OPC to 28'0
3om.4 3cLoooomA 29.9835 to 30.0165
I ,I
3 A 1 3.00000 A / 2.99685 to 3.00315
I
Figure 4-4. Connections for Ohms Verification
(300kG-3OOMil Ranges)
4-4