Service Manual CP 100 and CP 200 Electrocardiograph 25
Serial Number
Used to enter the S/N of the unit after a Main Board has been replaced.
Lead Off Threshold
The Lead Off Threshold setting provides a mechanism to increase/decrease the sensitivity
of the device to lead impedance. Lead impedance is the electrical resistance of a lead.
Lead impedance can rise if there is poor electrode/skin contact. As lead impedance rises,
the input signals become imbalanced, resulting in a poor quality signal.
If the lead impedance for any of the leads is above the threshold, the device replaces the
poor quality signal received from the patient cable with a square wave to indicate to the
user that the affected signals are not usable. The lead impedance of each of the leads is
independent, but there is a single threshold value. The threshold can be any of 15 values,
from 1 (lowest threshold) to 15 (highest threshold). The default threshold is 7. If the
threshold is changed to 1, it causes Lead Off all of the time, and setting it to 15 causes the
leads to never appear “Off”
Service Tests
Only authorized Welch Allyn Authorized Technicians are to perform the service tests.
Note
For use by Welch Allyn Authorized Repair facilities.
Function Description
Lead Off Threshold The Lead Off Threshold setting is provided to diagnose problems with the front end. By increasing the Lead
Off Threshold setting, the device accepts higher impedance signals, instead of replacing them with square
waves. Although the device displays poorer quality signals, they may be unsuitable for diagnostic purposes,
because they could be significantly distorted.
The Default setting for the Lead Off Threshold to 7
To access and change the Lead Off Threshold
Select Main Menu > Service Info > Device Info > Lead Off Threshold
Note
To exit any of the applications press the “Enter” or”OK” key.
Function Description
CPWSTEST.EXE Used to help troubleshoot USB issues.
Enable USB: Turns USB port on to be recognized by computer.
Disable USB: Turns USB port off so it is not recognized by computer.
MEANSMDWTESTER.EXE: Strictly used for development purposes.
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