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Diagnostic Tests
2-24
To test amplifier gain:
1. Connect the ECG simulator to the pads cable. Set the simulator output for
sine wave, 2 Hz or 10 Hz, 1 mV peak-to-peak.
2. Following the instructions under "Changing settings" on page 2-23, set
Selected lead to Pads. Only the Monitor frequency response will be avail-
able.
3. Wait for the displayed value under Monitor to stabilize.
4. The displayed value should be 1000 +10% (+100). Record this as "aaaa".
5. Connect the ECG simulator to the ECG leads cable.
6. Following the instructions under "Changing settings", set Selected lead to
Lead II.
7. Wait for the displayed value under Diagnostic to stabilize.
8. The displayed value should be 1000 +10% (+100). Record this as "bbbb".
To test amplifier noise:
1. Turn the simulator off. Leave it connected to the ECG cable, and leave
Selected lead set to Lead II.
2. Wait for the displayed value under Diagnostic to stabilize.
3. The displayed value should be 0 + 30 uV. Record this as "cc".
If the unit exhibits more than 30 uV of noise, try repositioning the cable
or unit to minimize external interference. See "Reducing Electromagnetic
Interference" on page 7-18. Also try various combinations of having the
ECG simulator turned on or off, and (if applicable) whether the simulator
is plugged into the AC mains.
4. Following the instructions under "Changing settings", set Selected lead to
Pads.
5. Connect the simulator to the pads cable.
6. Wait for the displayed value under Monitor to stabilize.
7. The displayed value should be 0 + 30 uV. Record this as "dd".
PCI function
This test checks the PCI (Patient Contact Impedance) function. The PCI mea-
surement is used to detect Pads Off.
1. Connect the test load to the pads cable.
2. The PCI setting should always be Off (factory set default). If it is On, press
the Volume Up and Down arrow keys simultaneously to turn it Off. (See
Figure 2-1 on page 2-11.) The software feature this setting controls is not
used in the M3500B/M5500B.
3. The PCI measurement should read 50 ohms +30 ohms. Record this
as "ee".
4. Disconnect the test load and leave the end of the cable open. The PCI
measurement should read > 2000 ohms (full scale). Record this
as "ffff".
Performance Verification and Safety Tests
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