BC Biomedical ESU-2000A User Manual

User Instructions

Auxiliary ESU Load Resistors

for use with BC Biomedical ESU-2000A

ESU Analyzer

The Auxiliary Load Resistors extend the input resistance range of the ESU-2000A, which has built-in input loads of 50,
100, 200, 300, 400, & 500 ohms. The Auxiliary Load Resistors may need to be connected either in series or in parallel
with the built-in ESU-2000A input loads. Only trained personnel should make these connections. Improper connec-

tions pose a hazard to the operator and to the equipment.

Series Connections (1000, 2000, & 3000 ohms)

1. Install the ESM-1 Switching Module on the ESU-2000A in the “ESU Power Testing” position.

2. Connect the patient plate of the ESU being tested to the Patient Plate jack on the ESU­2000A using a banana lead.

3. Refer to the table below. Connect the 500 Ohm input jack on the ESU-2000A to one end of the auxiliary load
resistor. Connect the other end of the auxiliary load resistor to the active electrode of the ESU being tested.
Use banana leads for all connections, and use alligator clips as necessary to make secure connections on the
auxiliary load resistors. Be sure that all exposed metal in the current path is safely positioned to avoid

shorting and to avoid contact with personnel and equipment.

4. Perform ESU power testing as desired into the total resistive load selected as per the table below. Read the
0-1000 mA current range on the ESU-2000A.

5. Remove power and disconnect all leads.

Parallel Connections (10 & 30 ohms)

1. Install the ESM-1 Switching Module on the ESU-2000A in the “ESU Power Testing” position.

2. Connect the patient plate of the ESU being tested to one end of the auxiliary load resistor AND to the patient
plate of the ESU being tested.

3. Refer to the table below. Connect the 50 Ohm input jack on the ESU-2000A to the other (unconnected) end of
the auxiliary load resistor AND to the active electrode of the ESU being tested. Use banana leads for all
connections, and use alligator clips as necessary to make secure connections on the auxiliary load resistors.

Be sure that all exposed metal in the current path is safely positioned to avoid shorting and to avoid
contact with personnel and equipment.

4. Perform ESU power testing as desired into the total resistive load selected as per the table below. Read the
0-1000 mA current range on the ESU-2000A.

5. Remove power and disconnect all leads.

Total Load

Resistance

(Ohms)

10

30
1000
2000
3000

Auxiliary Load
Resistor Value

(Ohms)

12.5
75

500
1500
2500

In series or

parallel with

ESU-2000A?

Parallel
Parallel

Series
Series
Series

Connect to this jack

on

ESU-2000A

50

50
500
500
500

1-888-223-6763 www.OneStopBiomedShop.com Fax: [phone]

Important Note:

The Auxiliary Load Resistors have wattage ratings that apply when the resistor is connected to a metal heat sink (typi­cally 1/8” thick aluminum.) Both the accuracy of the resistance value and its power dissipating capabilities are derated
when operating without a proper heat sink. Therefore, it is recommended that the resistor be mounted on an appropriate
metal heat sink when in use. Heat sinks are available from BC Group. The ESU-2000A and the Auxiliary Load Resistors
are intended for short-term, intermittent use to allow for convection cooling and heat dissipation between testing ses­sions.