Desco TB-2082 Installation Manual

TECHNICAL BULLETIN TB-2082

Monitor Calibration Unit
Operation Instructions

Figure 1. Desco 98220 Monitor Calibration Unit

Description

The Desco 98220 Monitor Calibration Unit is designed to

simplify the process of calibrating Workstation Continuous
Monitors. The unit allows the user to quickly and easily
verify whether a tester is operating within specifications. The
Monitor Calibration Unit is a passive device and requires no
power source.

Made in America

Calibrating the Full Time Continuous Monitor

The Full Time Continuous Monitor is available as following
item number:

Item Voltage

19225 120 VAC

TESTING THE OPERATOR CIRCUIT
Step 1: Connect the Calibration Unit’s banana plug wire

labeled “GROUND” to a known ground. Do not plug the
ground lead from the Calibration Unit to the monitor’s
common point ground banana jack. There is a 47 kilohm
resistance to ground.

Step 2: Insert the Calibration Unit’s banana plug labeled

“OPERATOR” into the jack labeled “OPERATOR” on the Full
Time Continuous Monitor (see Figure 2). Power the monitor.

“A Compliance Verification Plan shall be established
to ensure the Organization’s fulfillment of the technical
requirements of the ESD Control Program Plan (ANSI/
ESD S20.20-2007 section 7.3). The product qualification
for the Continuous Monitors per ANSI/ESD S20.20-2007
Table 3 is “User defined” test method and required limits,
and compliance verification is per ESD TR53 with the
required limit being “Manufacturer defined.” Per ESD TR53
Compiance Verification “Compliance verification of the
constant monitor device should follow the manufacturer’s
instructions.”

Packaging

1 Monitor Calibration Unit
1 Alligator Clip
1 Stacking Snap Banana Jack Adapter
1 Banana Jack to Wire Adapter
1 Certicate of Calibration

Calibration Test Procedures

The Monitor Calibration Unit was specifically designed for
use in calibration of Desco brand equipment. The following
step by step procedures will cover calibration for specific test
units. The procedures will not cover adjustment of the test
equipment. For detailed information regarding adjustment of
specific Desco brand testers contact our Customer Service
Department at 909-627-8178.

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com

Figure 2. Connecting the OPERATOR test lead from
the Monitor Calibration Unit to the Full Time Continuous
Monitor

Step 3: Start the Calibration Unit’s selector knob at the full

counter-clockwise position. When testing the OPERATOR
circuit, test only the first four limits on the Calibration Unit.
Rotate the selector knob to the “LOW FAIL” position; the
red “OPERATOR GROUND” LED on the monitor should
illuminate and alarm.

TB-2082 Page 1 of 6

Rev. December 2009

© 2009 DESCO INDUSTRIES, INC.

Employee Owned

Step 4: Rotate the selector knob clockwise to the “LOW

LIMIT” position of the green pass sector. The monitor’s
green “OPERATOR GROUND” LED should illuminate.

Step 5: Rotate the selector knob clockwise to the “HIGH

PASS” position at the end of the green pass sector. The
monitor’s green “OPERATOR GROUND” LED should remain
illuminated.

Step 6: Rotate the selector knob clockwise to the “HIGH

FAIL” position. The green “OPERATOR GROUND” LED
should turn off and the red LED should illuminate and the
alarm should sound.

Step 7: Disconnect the Monitor Calibration Unit from the

monitor.

TESTING THE MAT CIRCUIT
Step 1: Connect the Calibration Unit’s banana plug wire

labeled “GROUND” to a known ground.

Step 2: Connect the included banana jack to wire adapter to

the Calibration Unit’s banana plug labeled “MAT.” Insert the
wire end of the adapter to the monitor’s green terminal block
labeled “MAT” (see Figure 3).

Calibrating the Dual Operator Continuous
Monitor with Two Satellites

The Dual Operator Continuous Monitor with Two Satellites is
available as following item numbers:

Item Voltage

19232 120 VAC
19233 220 VAC

Note: If calibrating discontinued items 19208 or 19209,

disconnect the remote jacks (if used) from the unit. Remote
jacks may cause intermittencies in calibration. Leave the
matt connection to the 19208 or 19209 in place.

TESTING THE OPERATOR CIRCUIT
Step 1:

labeled “GROUND” to a known ground.

Step 2: Insert the Calibration Unit’s banana plug labeled

“OPERATOR” into the jack labeled “OPERATOR” on the
satellite remote (see Figure 4).

Connect the Calibration Unit’s banana plug wire

Figure 3. Connecting the MAT test lead from the Monitor
Calibration Unit to the Full Time Continuous Monitor

Step 3: Rotate the Calibration Unit’s knob switch to the MAT

FAIL 10M position. The monitor’s red “MAT GROUND” LED
should illuminate and the alarm should sound.

Step 4: Rotate the selector knob counter-clockwise to the

MAT PASS 10M position. The monitor’s “MAT GROUND”
green LED should illuminate.

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com

TB-2082 Page 2 of 6

Figure 4. Connecting the OPERATOR test lead from the
Monitor Calibration Unit to the satellite remote

Step 3: Start the Calibration Unit’s selector knob at the full

counter-clockwise position and power the monitor. When
testing the OPERATOR circuit, test only the first four limits
on the Calibration Unit. Rotate the selector knob to the
“LOW FAIL” position; the corresponding operator red LED on
the monitor should illuminate and alarm.

Step 4: Rotate the selector knob clockwise to the “LOW

LIMIT” position of the green pass sector. The monitor’s
corresponding green “OPR1” or “OPR2” LED should
illuminate.

© 2009 DESCO INDUSTRIES, INC.

Employee Owned