TB-9105
Page 3 of 4
© 2020 DESCO INDUSTRIES INC
Employee Owned
SCS
- 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website:
Verifying the Mat Circuit
13. Connect the included stacking snap to the
verification tester's white mat test lead.
14. Disconnect the monitor's white mat monitor cord
from its worksurface mat and turn it over to expose
its 10mm snap.
15. Connect the verification tester's white mat test lead
to the mat monitor cord's 10mm snap. The monitor's
mat LED should illuminate green, and its audible
alarm should not sound.
16. Press the Mat Fail Pushbutton. The monitor's mat
LED should illuminate red, and its audible alarm
should sound.
Maintenance
Battery Replacement
Replace the battery once the Low Battery LED
illuminates yellow. Open the compartment located on
the back of the tester to replace the battery. The tester
uses one 9V alkaline battery. Ensure that the battery's
polarities are oriented correctly to avoid possible circuit
damage.
Figure 5. Connecting the 724 Plus Monitor Verification
Tester to the 724 Plus Workstation Monitor's mat monitor
cord
Figure 6. Removing the battery cover located on the
back of the 724 Plus Monitor Verification Tester
Calibration
Frequency of recalibration should be based on the
critical nature of those ESD sensitive items handled and
the risk of failure for the ESD protective equipment and
materials. In general, SCS recommends that calibration
be performed annually.
Use the information below to verify if the 724 Plus
Monitor Verification Tester operates within its
specifications.
The values may be verified using a digital
multimeter. Connect the multimeter's test leads across
the 724 Plus Monitor Verification Tester’s stereo plug. If
any value is out of specification, the Verification Tester
must be returned to the manufacturer for repair.
Resistance Values:
Setting
Nominal
Resistance
% Tolerance of
Nominal Resistance
1.5M LOW
1.33 megohms
±2%
1.5M PASS
1.69 megohms
±2%
10M PASS
8.45 megohms
±2%
10M HIGH
11.5 megohms
±2%
35M PASS
29.4 megohms
±2%
35M HIGH
40.2 megohms
±2%
MAT FAIL
4.1 megohms
±2%