Innomed Medical Hear Screen 112C-1, Service Manual

Page: 19 / 47

Innomed Medical Heart Screen 112C-1 Service manual
19/47 D-7443-1-C
6.2.3 Latch-up watch check
Only connect the DC generator to the amplifier input according to the table. The DC level has to be controlled
between 0 and 450 mV. The filter must be turned off.
Connect the patient cable according to the following table and start the channels one-by-one with the channel
selector. On the display check the measurement order quality, the baseline, which can be reset after DC
controlling with the blocking command.
During the examination the device indicates the latch-up watch circuit’s operation with text message. During the
measurement enter the DC values into the table where the text appeared. The comparison levels must be min.
340 mV, max 450mV.
P1 P2 Examined lead Positive DC (mV) Negative DC (mV)
L all other I
R all other II
V1 all other V1
V2 all other V2
V3 all other V3
V4 all other V4
V5 all other V5
V6 all other V6
6.2.4 Measuring noise on the input and baseline checking
Make a 10 seconds long recording with all inputs connected together, at *2 sensitivity, 25 mm/sec speed from all
groups. The filter must be off. Measure the noise and absolute deviation from the baseline on the null-line.
The noise on the input is acceptable if the value of the noise peak-to-peak is not greater than
(0.4 mm+1 pixel)=0.525 mm on any lead. The null-line is acceptable if the deviation from the baseline is less
than 2 mm anywhere on the printout and on the display.