SECTION 3
PERFORMANCE VERIFICATION
3.1 INTRODUCTION
Performance verification may be performed upon receipt of
the instrument to ensure that no damage or misadjustment
has occurred during transit. Verification may also be per-
formed whenever there is question of the instrument’s ac-
curacy.
NOTE
For instruments that are still under warranty (less
than 12 months since date of shipment), whose
performance falls outside of the specifications at
any point, contact your Keithley representative
or the factory immediately.
3.2 ENVIRONMENTAL CONDITIONS
The performance verification procedure should take place at
18OC to 28OC and at less than 70% relative humidity, unless
otherwise indicated.
3.3 RECOMMENDED TEST EQUIPMENT
Table 3-l lists all the test equipment required for verification.
If alternate equipment is used, the alternate equipment’s
specifications must be at least as good as the specifications
listed in Table 3-l.
3.4 INITIAL CONDITIONS
The Model 224 must be turned on and allowed one hour for
warm up. If the instrument has been subject to extremes of
temperature,
allow sufficient time for the internal
temperature to reach normal operating conditions as
specified in paragraph 3.2. Typically, it takes one hour to
stabilize a unit that is 10°C (18OF) out of the specified
temperature range.
3.5 PERFORMANCE VERIFICATION PROCEDURE
Use the following procedure to verify the accuracy of the
Model 224. If the Model 224 is out of specification, proceed
to Section 5 Maintenance unless the Model 224 is under war-
ranty. In that case contact your Keithley representative or the
factory.
1. Connect the Model 224, Model 192 and the 1OOQ resistor
as shown in Figure 3-1.
2. Select the 20VDC range on the Model 192.
A.
B.
C.
Program the Model 224 to output +OO.O03A. Verify
that the reading on the Model 192 does not exceed
5mV.
Program the Model 224 to output +O.OOO-3A. Verify
that the reading on the Model 192 does not exceed
ImV.
Select the 2V range on the Model 192. Program the
Model 224 to output .OOOO-3A. Verify that the reading
on the Model 192 does not exceed + 1OOpV. Select the
20V range on the Model 192.
3.
Program the Model 224 for + 100mA with a 20V com-
pliance limit.
4.
5.
Press the OPERATE button on the Model 224.
Verify that the reading on the Model 192 is within the limits
specified in Table 3-2.
6. Repeat steps 2 through 5 for the 10mA and 1mA ranges.
7. Repeat steps 2 through 6 with negative output current.
NOTE
Verification should be performed by qualified
personnel using accurate and reliable test equip-
ment.
3.5.1 1WmA to ImA Range Verification
Table 3-2. IOOmA to 1mA Verification
Allowable Reading at
*Model 192 20VDC Range
**Model 192 2VDC Range
Table 3-1. Recommended Test Equipment
Description Specification
Mfr. Model
DMM
0.005% (2V range)
Keithley 192
Precision Resistor 1OQ kO.Ol% 1W
Keithley R-196-10Q
Precision Resistor IOOkD + 0.01%
Caddock TF020N
3-l
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