
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Website: Desco.com TB-3019 Page 3 of 4
2014 DESCO INDUSTRIES, INC.
Employee Owned
Figure 4. Connecting a dual-wire wrist strap to the
operator remote
SETTING THE OPERATOR TEST VOLTAGE AND TEST
LIMIT
The Dual-Wire Dual-Operator Monitor’s operator test voltage
and high test limit can be set to different values. The
operator test voltage can be set to either +5V or +8V, and
the operator high test limit can be set to either 10 megohms
or 35 megohms. The default voltage is +8V, and the default
operator high test limit is 35 megohms. These settings are
controlled by a set of 3 switches located inside the monitor’s
enclosure.
NOTE: Desco recommends re-calibration of the monitor
should either setting be changed. See the “Calibration”
section for more information.
To gain access to these switches, remove the monitor’s
cover and position the monitor so the PCB matches the
orientation shown in Figure 5. Switches SW1 and SW2
control the operator test voltage. Switch SW3 controls the
operator high test limit.
Operator Test Voltage
+5V
SW1 Position: RIGHT
SW2 Position: LEFT
+8V
SW1 Position: LEFT
SW2 Position: RIGHT
Operator High Test Limit
10 megohms
SW3 Position: RIGHT
35 megohms
SW3 Position: LEFT
Calibration
The Dual-Wire Dual-Operator Programmable Monitor
is calibrated to standards traceable to NIST. Frequency of
recalibratrion 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, we
recommend that calibration be performed annually.
Use the EMIT
50524 Limit Comparator for Dual-Wire
Monitors to perform periodic testing (once every 6-12
months) of the Dual-Wire Dual-Operator Programmable
Monitor. The Limit Comparator can be used on the shop
floor within a few minutes virtually eliminating downtime,
verifying that the monitor is operating within tolerances.
Figure 5. Switches SW1, SW2 and SW3 inside the
monitor’s enclosure
Figure 6. EMIT 50524 Limit Comparator for Dual-Wire Monitors