Performance Verification; Environmental Conditions; Recommended Equipment; Channel Resistance Tests - Keithley 7999-6 Instruction Manual

Performance verification
The following paragraphs discuss performance verification procedures for the Model 7999-6
including a channel resistance verification procedure.
CAUTION
NOTE Failure of any performance verification test may indicate that the 7999-6 GPIB RF
relay unit is contaminated. See "Handling and cleaning precautions" earlier in this
section for information on cleaning the 7999-6.

Environmental conditions

All verification measurements should be made at an ambient temperature between 18˚ and
28˚C, and at a relative humidity of less than 70%.

Recommended equipment

Table 4-1 summarizes the equipment necessary for performance verification (channel resis-
tance tests).
Table 4-1
Recommended verification equipment
Manufacturer/Model
Keithley 2010
Keithley 1681

Channel resistance tests

Perform the following steps to verify the relay contact is closing properly, the relay resis-
tance is within specification, and that the relay opens properly.
1. Turn on the Model 2010 DMM, and allow it to warm up for one hour before making
measurements.
Set the Model 2010 to the 10 Ω range, and connect the four test leads to the INPUT and
2.
SENSE Ω 4 WIRE jacks.
3. Short the free ends of the four test leads together, and enable REL on the Model 2010 to
null out residual resistance. Leave REL enabled for the entire test.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Contamination will degrade the performance of the 7999-6. To avoid
contamination, always grasp the 7999-6 by the cover; do not touch the
connectors.
Equipment Description
Digital Multimeter
Test Lead Sets (2)
Service Information
Specifications
10 Ω range, 60ppm
Banana plug/clips
4-3