Mindray DS USA Inc. WT0707-00000 Manuel D’Utilisation

1.4

Troubleshooting

This section lists some of the potential issues that may occur with the monitor. 

Wandering ECG

Respiration artifact.

Try a different base line lead 
configuration.

Noisy ECG traces

Loose or dry electrodes. 

Apply new electrodes. 

Defective electrode wires.

Replace wires as necessary.

Patient cable or leads are routed 
too close to other electrical 
devices.

Eliminate 60Hz interference. Use 
ECG cable with built-in filter block.

Low Amplitude ECG

Electrode could be positioned 
over a bone or muscle mass.

Reposition electrodes. Select ECG 
SIZE button.

Excessive Electrosurgical 
Interference

Inadequate skin prep prior to 
application of electrode.

Repeat skin prep and electrode 
placement procedures.
Add additional gel to electrodes.

Intermittent Signal

Connections not tight and 
properly secured.

Ensure proper connection. 
(Electrode to lead, lead to cable, 
cable to monitor.) 

Electrodes dry.

Reprep skin and apply fresh moist 
electrodes.

Cable or lead wires damaged.

Check with continuity tester.

Excessive alarms: heart 
rate, lead fault

Electrodes dry. 

Reprep skin and apply fresh, moist 
electrodes.

Alarm limits set too close to 
patient's normal heart rate.

Readjust.

Rwave wrong size.

Must be twice the amplitude of 
other part of wave form.

Excessive patient movement or 
muscle tremor.

Reposition electrodes and secure 
with tape if necessary.

Low Amplitude ECG 
Signal

Gain set too low. (Set through 
SIZE button.)

Readjust as required.

Skin improperly prepared. 

Abrade skin.

Possibly not patient's normal 
complex.

Check with 12 lead 
electrocardiogram.

Electrode could be positioned 
over a bone or muscle mass.

Reposition electrodes.

Waveforms Not Moving

FREEZE button may have been 
pressed.

Select the FREEZE button to 
unfreeze the trace.

Temperature Probes not 
Working

Poor contact from probes to body.

Check the body surface contact at 
the probe tip. Reposition or apply 
thermoconductive gel.

Display Appears to be 
Off

Mains power switch may not be 
on. 

Check main power switch on side 
panel. 

Unit may not be plugged into an 
AC outlet. 

Check power cord (Is it plugged 
in?). 

If used as a portable, battery 
pack may be drained.

If battery pack is drained, plug 
into an AC outlet to recharge the 
battery. A period of 16 hours is 
required for a full charge.