SCS 770030 Wrist and Foot Strap Combo Tester Instruction Manual

: June 16, 2024
: SCS

Table of Contents

Figure 1. SCS 770030 Combo Tester
Description
Packaging
Features and Components
Installation
INSTALLING THE 770031 COMBO TESTER WITH STAND AND FOOT PLATE
Operation
FOOTWEAR TEST
Maintenance
BATTERY REPLACMENT
Calibration
Specifications
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SCS 770030 Wrist and Foot Strap Combo Tester Instruction Manual

Figure 1. SCS 770030 Combo Tester

Combo Tester

Description

The SCS Combo Tester verifies the functionality of an operator’s wrist strap and footwear (footwear test requires foot plate). It determines if an operator’s wrist strap and footwear will function correctly. A rocker switch allows the operator to select a wrist strap or footwear test. A green light indicates that the wrist strap or footwear is passing. Red and yellow lights plus an audible alarm indicate when the wrist strap or footwear is failing. If failure occurs, the tester will also display if the grounding device’s resistance is too low or too high.

The Combo Tester may also be used to test smocks or garments that feature a grounding mechanism for operators using a coiled cord connection.

The factory test limits are set to:

Wrist Straps: 750 kilohms and 10 megohms
Footwear: 750 kilohms and 100 megohms

Limits meet the required limits for Compliance Verification of ANSI/ESD S20.20 (Wrist Strap System < 3.5 x 107 ohms and Footwear < 1 x 109 ohms tested per ESD TR53).

Contact SCS Customer Service if custom test limits are required.

The Combo Tester can be powered by a 9 volt battery or the SCS 770034 (North America plug) and 770035 (IEC inlet) power adapters (sold separately). A warning light on the tester indicates when the battery power is too low and affecting the test results.

Each Combo Tester is calibrated with accepted procedures and standards traceable to the National Institute of Standards and Technology (NIST) and includes a NIST certificate.

Per ANSI/ESD S20.20 section 7.4 “A Compliance Verification Plan shall be established to ensure the Organization’s fulfillment of the technical requirements of the ESD Control Program Plan. Process monitoring (measurements) shall be conducted in accordance with a Compliance Verification Plan that identifies the technical requirements to be verified, the measurement limits and the frequency at which those verifications shall occur. The Compliance Verification Plan shall document the test methods and equipment used for process monitoring and measurements. … The test equipment selected shall be capable of making the measurements defined in the Compliance Verification Plan.”

Per ANSI/ESD S1.1 Annex A.3 Frequency of System Testing “The wrist strap system should be tested daily to ensure proper electrical resistance.”

Per ESD Handbook ESD TR20.20 section 5.3.2.4.2 Additional User Wrist Strap Testing “Proper testing of the wrist strap includes the resistance of the groundable point on the end of the cord, the cord itself, the resistor, the cord-to-cuff snap connector, the resistance of the interface of the cuff, the cuff/wrist interface, and the resistance of the person between the wrist and the hand that contacts the test electrode.”

Per ESD Handbook ESD TR20.20 section 5.3.2.2.2 Wrist Strap Ground Cord “At first glance, the ground cord appears to be a relatively simple assembly. However, the design requirements are considerable, given the wide range of user applications and the durability requirements of constant tugging, flexing, and dragging over the edge of workstation tops and equipment chassis.”

Item	Description
770030	Combo Tester
770031	Combo Tester with Stand and Foot Plate
770032	Stand and Foot Plate
770033	Calibration Unit for Combo Tester
770034	Power Adapter, 100-240VAC Input, 6.5VDC Output, North America Plug
770035	Power Adapter, 100-240VAC Input, 6.5VDC Output, IEC Inlet

*Use only the SCS 770034 and 770035 power adapters with the Combo Tester. Using any other power adapter may damage the unit and void the warranty.

Packaging

770030 COMBO TESTER

Combo Tester
1 Foot Plate Cord, 5 inches
1 9V Battery
1 Certificate of Calibration

770031 COMBO TESTER WITH STAND AND FOOT PLATE

1 Combo Tester
1 Foot Plate Ground Wire, 5 inches
1 9V Battery
1 Foot Plate
1 Pedestal
3 Button Head Screws, 1/4-20 x 3/4″
1 Allen Wrench, 5/32″
1 Flat Head Screw, 8-32 x 5/8″
1 Knurled Nut, 8-32
1 Black Cap
1 Poster
1 Certificate of Calibration

Figure 2. SCS 770031 Combo Tester with Stand and Foot Plate

770032 STAND AND FOOT PLATE

1 Foot Plate
1 Pedestal
1 Foot Plate Cord, 5 inches
3 Button Head Screws, 1/4-20 x 3/4″
1 Allen Wrench, 5/32″
1 Flat Head Screw, 8-32 x 5/8″
1 Knurled Nut, 8-32
1 Black Cap
1 Poster

Figure 3. SCS 770032 Stand and Foot Plate

Features and Components

Product Overview
Figure 4. Combo Tester features and components

A. 6-9VDC Power Jack: Connect the 770034 or 770035 power adapter (sold separately) here to power the Combo Tester.
B. Test Result LEDs: Displays the test results.
C. Foot Plate Jack: Connect the banana plug terminal of the foot plate cord here and the other end to the pedestal (770031).
D. Rocker Switch: Toggle to the left when performing a footwear test. Toggle to the right when performing a wrist strap test.
E. Single-Wire Wrist Strap Jack: Insert your single-wire wrist cord here to test your wrist strap.
F. Test Switch: Push down and hold your finger here to perform a test.
G. Low Battery LED: Illuminates when the battery power is low and needs to be replaced.

Installation

The Combo Tester is portable when powered by a 9V alkaline battery, but it also has the flexibility of being permanently installed at a location. Use the three keyhole slots located on the back of the Combo Tester to mount it to a wall or stand.

INSTALLING THE 770030 COMBO TESTER

Install the 9V alkaline battery into the Combo Tester.
Select a location to mount the Combo Tester.
Install three #6 or #8 screws into a wall or other vertical surface as shown in the figure below. Measure that the screw heads do not project out more than 1/4″ from mounting surface.
Figure 5. Combo Tester keyhole slots
Mount the Combo Tester onto the screws, and pull it down to secure it into place.
Set the Stainless Steel Foot Plate below the tester (if applicable).
Insert the 6′ long foot plate cord’s banana plug intothe Combo Tester’s foot plate jack.
Figure 6. Inserting the foot plate cord’s banana jack into the Combo Tester
Snap the opposite end of the foot plate cord onto the Stainless Steel Foot Plate.

INSTALLING THE 770031 COMBO TESTER WITH STAND AND FOOT PLATE

Position the pedestal on top of the foot plate with the mounting bracket sloping toward the operator. Secure the pedestal to the foot plate using the 3 included button head screws and allen wrench.
Figure 7. Securing the pedestal to the foot plate
Install the 9V alkaline battery into the Combo Tester.
Mount the Combo Tester onto the pedestal’s mounting bracket and flat head screw, and screw down to secure it into place.
Insert the 5″ long foot plate cord’s banana plug into the Combo Tester’s foot plate jack.
Attach the foot plate cord’s ring terminal to the flat head screw located at the back of the pedestal’s mounting bracket, and tighten the knurled nut to secure.
Figure 8. Installing the Combo Tester to the pedestal
Cover the knurled nut and flat head screw with included insulative vinyl cap.
Install the included poster at eye level nearby the test station.
Figure 9. Completed Combo Tester with Stand and Foot Plate assembly

Operation

WRIST STRAP TEST

While wearing a wrist strap, plug the wrist cord into the wrist strap jack located on the face of the Combo Tester.
Toggle the rocker switch to the right toward WRIST STRAP.
Push down and hold the test switch until the test results are displayed. Ensure that your finger also makes contact with the metal ring around the push button when performing a test.
DO NOT touch any other metal while performing your test as this will affect your results.
Figure 10. Performing a wrist strap test
A “PASS” test result is indicated by illumination of the green LED. A “FAIL LOW” test result is indicated by illumination of the red LED. A “FAIL HIGH” test result is indicated by illumination of the yellow LED.
If your ESD test fails, check your wrist strap and ensure that it is being worn correctly and/or needs to be replaced.

NOTE 1: The Combo Tester may briefly display “FAIL HIGH” once the test button is released at the conclusion of a test. Residual voltage in the circuit’s capacitors causes the test to continue for a split second after the button is released.

NOTE 2: Failures may be caused by dry skin or minimal sweat layer. For wrist straps, try using an approved dissipative hand lotion such as Menda Reztore™ ESD Hand Lotion to your wrist prior to use.

FOOTWEAR TEST

Toggle the rocker switch to the left toward FOOT PLATE.
While wearing ESD footwear, place one foot on the foot plate, and lift the second foot off the floor. Make sure there is no wrist cord plugged into the WRIST STRAP jack.
Push down and hold the test switch until the test results are displayed. Ensure that your finger also makes contact with the metal ring around the pushbutton when performing a test.
DO NOT touch any other metal while performing your test as this will affect your results.
Figure 11. Performing a footwear test with the 770031 Combo Tester with Stand and Foot Plate
A “PASS” test result is indicated by illumination of the green LED. A “FAIL LOW” test result is indicated by illumination of the red LED. A “FAIL HIGH” test result is indicated by illumination of the yellow LED. If your ESD test fails, check your footwear and ensure that it is being worn correctly and/or needs to be replaced.
NOTE 1: The Combo Tester may briefly display “FAIL HIGH” once the test button is released at the conclusion of a test. Residual voltage in the circuit’s capacitors causes the test to continue for a split second after the button is released.
NOTE 2: Failures may be caused by dry skin or minimal sweat layer. Footwear test results can be improved by taking a short walk to build a sweat layer for better conductivity.
Repeat steps 2-4 for the second foot

Maintenance

The Combo Tester requires little maintenance. There are no user serviceable parts. If your meter requires service beyond cleaning the test switch or foot plate, please contact the factory.

Use a minimum of 80% isopropyl alcohol to clean the test switch. Other cleaners are susceptible to leaving residue.

BATTERY REPLACMENT

The low battery indicator flashes briefly every time the unit is used. Replace the battery once the indicator becomes constant during testing. Open the compartment located on the back of the tester to replace the battery. The tester uses one 9V alkaline battery.
Figure 12. Replacing the battery
Installation Instruction

Calibration

The SCS Combo Tester is calibrated to NIST traceable standards. There are no user adjustments necessary. We recommend that calibration be performed annually using the SCS 770033 Calibration Unit. It is a convenient product which allows the customer to perform NIST traceable calibration on single-wire personnel testers. The 770033 is designed to be used on the shop floor at the workstation, virtually eliminating downtime, verifying that the tester is operating within tolerances.

View technical bulletin TB-9073 for more information on the 770033 Calibration Unit and instructions to calibrate the Combo Tester.

Figure 13. SCS 770033 Calibration Unit