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

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

PASS” position at the end of the green pass sector. The
monitor’s corresponding green “OPR1” or “OPR2” LED
should remain illuminated.

Note: During FAIL LOW and FAIL HIGH, the monitor will

continuously alarm until the banana lead is removed from the
satellite remote. The alarm will shut off approximately 8-10
seconds after the removal of the banana lead.

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

FAIL” position. The monitor’s corresponding green “OPR1”
or “OPR2” LED should turn off and the red LED should
illuminate and the alarm should sound.

Step 7: Disconnect the Monitor Calibration Unit from the

satellite remote.

Step 8: Repeat this procedure for the remaining satellite

remote.

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 stacking snap to the banana

plug labeled “MAT” on the Calibration Unit. Disconnect the
satellite remote from its mat connection and re-install it to the
Calibration Unit’s stacking snap (see Figure 5).

Note: The stacking snap must be isolated from the grounded

mat.

Step 5: Repeat this procedure for the remaining satellite

remote.

Calibrating the Jewel® Workstation Continuous
Mini Monitor

The Jewel® Workstation Continuous Mini Monitor is available
as following item numbers:

Item Voltage

19212 120 VAC

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

labeled “GROUND” to a known ground.

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

“OPERATOR” into the jack labeled “OPERATOR” on the
Jewel® Workstation Continuous Mini Monitor (see Figure 6).

Figure 5. Connecting the MAT test lead from the Monitor
Calibration Unit to the satellite remote

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

FAIL 10M position. The monitor’s corresponding red “MAT1”
or “MAT2” 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 corresponding
“MAT1” or “MAT2” 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 3 of 6

Figure 6. Connecting the OPERATOR test lead from the
Monitor Calibration Unit to the

Jewel® Workstation

Continuous Mini Monitor

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 red “OPERATOR GROUND” LED
on the monitor should illuminate and alarm.

© 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 stacking snap to the banana

plug labeled “MAT” on the Calibration Unit. Detach the
monitor from its mat connection and re-install the snap
located underneath the LEDs to the Calibration Unit’s
stacking snap (see Figure 7).

Calibrating the Multi-Mount Continuous Monitor

The Multi-Mount Continuous Monitor is available as following
item numbers:

Item Voltage

19226 120 VAC
19227 220 VAC

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

labeled “GROUND” to a known ground.

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

“OPERATOR” into the jack labeled “OPR” on the Multi-Mount
Continuous Monitor (see Figure 8).

BOTTOM VIEW

Figure 7. Connecting the MAT test lead from the Monitor
Calibration Unit to the

Jewel® Workstation Continuous Mini

Monitor

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

FAIL 500M position. The monitor’s red “WORKSURFACE
GROUND” LED should illuminate and the alarm should
sound.

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

MAT PASS 500M position. The monitor’s “WORKSURFACE
GROUND” green LED should illuminate.

Note: During FAIL LOW and FAIL HIGH, the monitor will

continuously alarm until the banana lead is removed from the
satellite remote. The alarm will shut off approximately 8-10
seconds after the removal of the banana lead.

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

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

Figure 8. Connecting the OPERATOR test lead from the
Monitor Calibration Unit to the

Multi-Mount Continuous

Monitor

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 red “OPERATOR GROUND” 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
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.

TB-2082 Page 4 of 6

© 2009 DESCO INDUSTRIES, INC.

Employee Owned

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
other end of the wire to the monitor’s green terminal block
labeled “MAT” (see Figure 9).

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

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

Note: The 98220 Monitor Calibration Unit also calibrates the

following discontinued Desco items:

Full Time Continuous Monitor

19210, 19211, 98210, 98211

Dual Operator Continuous Monitor with Satellites

19208, 19209, 19230, 19231, 98207, 98208

Jewel® Workstation Continuous Mini Monitor

19213, 19214, 19215, 19216, 19217

Multi-Mount Continuous Monitor

19220, 19221, 19222, 19223, 98225, 98226, 98227, 98228

Calibration

Required Test Equipment: RLC Bridge
Settings:
For 50 Hz, Frequency = 1,000 Hz (20 x 50), 20th Harmonic
For 60 Hz, Frequency = 1,020 Hz (17 x 60), 17th Harmonic
Set function switch to read “equivalent parallel circuit”

Additional Required Test Equipment for 98220 MAT

Resistance Measurement:
Megger: Set V compliance = 50V or less
or
DMM: 50V power supply

Figure 9. Connecting the MAT test lead from the Monitor
Calibration Unit to the

Multi-Mount Continuous Monitor

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

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

Specifications

Weight: 6.8 oz
192 g

Dimensions: 4.5" x 2.5" x 1.2"

11.4 cm x 6.4 cm x 3.0 cm

Record Data for:

Low Pass Low Fail High Pass High Fail

Serial # Cp Dis Cp Dis Cp Dis Cp Dis

Serial # Mat Pass Mat Fail Megohms @ 50V

Compare with the following specs (tolerance = ± 10%):

Equiv. Parallel C Dissipation Factor
Low Fail 138.9 pF 0.158
Low Pass 118.6 pF 0.367
Hi Pass 49.0 pF 0.445
Hi Fail 44.7 pF 0.192

Mat (tolerance = ± 4%):

Pass Fail V Measure ~ 50
10 Meg 8 Megohms 12 Megohms
100 Meg 80 Megohms 120 Megohms
500 Meg 400 Megohms 600 Megohms

TB-2082 Page 5 of 6

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

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

© 2009 DESCO INDUSTRIES, INC.

Employee Owned

Limited Warranty

Desco expressly warrants that for a period of one (1) year from the date of purchase Desco Monitor Calibration Units will be free of defects in
material (parts) and workmanship (labor). Within the warranty period, a credit for purchase of replacement Desco Monitor Calbiration Units, or,
at Desco’s option, the Monitor Calibration Unit will be repaired or replaced free of charge. If product credit is issued, the amount will be
calculated by multiplying the unused portion of the expected one year life times the original unit purchase price. Call our Customer Service
Department at 909-627-8178 (Chino, CA) or 781-821-8370 (Canton, MA) for a Return Material Authorization (RMA) and proper shipping
instructions and address. Please include a copy of your original packing slip, invoice, or other proof of date of purchase. Any unit under
warranty should be shipped prepaid to the Desco factory. Warranty replacements will take approximately two weeks.

If your unit is out of warranty, call our Customer Service Department at 909-627-8178 (Chino, CA) or 781-821-8370 (Canton, MA) for a Return
Material Authorization (RMA) and proper shipping instructions and address. Desco will quote repair charges necessary to bring your unit up to
factory standards.

Warranty Exclusions

THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL OTHER PRODUCT WARRANTIES, EXPRESSED AND IMPLIED,
INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED.
The express warranty will not apply to defects or damage due to accidents, neglect, misuse, alterations, operator error, or failure to properly
maintain, clean or repair products.

Limit of Liability

In no event will Desco or any seller be responsible or liable for any injury, loss or damage, direct or consequential, arising out of the use of or
the inability to use the product. Before using, users shall determine the suitability of the product for their intended use, and users assume all
risk and liability whatsoever in connection therewith.

TB-2082 Page 6 of 6

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

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

© 2009 DESCO INDUSTRIES, INC.

Employee Owned