Limit comparator: EMIT/Desco 50426
This limit comparator, EMIT/Desco 50426 from DESCO, is designed for periodic verification of personal ESD protective equipment. The EMIT/Desco 50426 is used to check the test limits of Desco's Combo Tester X3, Combo Tester X3+, and EMIT SmartLog Pro without removing the testers from the production or work area.Function and contents
- Device type: Limit comparator for verification of personal testers.
- Supplied with two test leads with banana plug terminals, 5' length.
- The unit is NIST calibrated and manufactured in the USA.
Documentation
Manufacturer's technical bulletin TB-6612 contains operating instructions, resistance setting tables, and a procedure for 1 GΩ calibration using 5-pound electrodes. See manufacturer's datasheet
Typical applications
- Perform periodic verification (recommended every 6–12 months) of the Desco Combo Tester X3, Combo Tester X3+, and EMIT SmartLog Pro.
- Check that test limits for both wrist strap and footwear tests respond correctly (PASS/FAIL) without removing the tester from the site.
Brief operational description
- Connect the included test leads to the yellow banana jacks on the comparator and then to the tester's relevant jacks (e.g., SINGLE-WIRE or FOOT PLATE) and equipment ground as described in TB-6612.
- Select the desired PASS/FAIL settings on the comparator's rotary dial and perform the test by holding down the tester's test button, after which the tester's indication should show the expected PASS or FAIL.
- For 1 GΩ calibration, two 5-pound electrodes and the procedure in TB-6612 are required to load and confirm 1G CAL.
Specifications
- Compatible devices: Combo Tester X3 (several model numbers listed in TB-6612), Combo Tester X3+, SmartLog Pro 2 (model numbers listed in TB-6612).
- Included: 1 Limit Comparator, 2 test leads with banana plug terminals, 5' length.
- Source for operation and settings: TB-6612 technical bulletin (Desco).
- NIST calibrated.
- Country of origin: United States of America.
- Operating temperature: 50 to 95°F (10 to 35°C).
- Environmental requirements: Indoor use, maximum altitude 6500 ft (2 km); relative humidity max 80% up to 85°F (30°C) decreasing to 50% at 85°F.
- Dimensions: 3.8" L x 2.4" W x 0.9" H (97 mm x 61 mm x 23 mm).
- Weight: 0.2 lbs (0.1 kg).
- Resistance values and tolerances: See TB-6612 for complete tables of nominal resistances and tolerances (incl. 100K, 750K, 1M, 10M, 35M, 100M, 1G and 1G CAL values).
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