CMRR 3.0E | User Manual
16
Figure 6-5, options in
“DC Offset”
CMRR 3.0E uses a built-in battery supplying the electricity required by DC offset option. Before turning off
the power, user must check and confirm DC offset is switched to “OFF”. If not, it would keep consuming
battery power in the power-off status.
6.1.2
Test Exemplification
6.1.2.1
IEC80601-2-26: 2019
IEC80601-2-26 is the medical standard for EEG. Based on the requirement of IEC80601-2-26, the output
amplitude of all channels shall not exceed 100 µVp-v (10 mm p-v at 0.1 mm/µV gain), WhaleTeq suggests
use RA/LA/LL/V1/V2/V3/V4/V5/V6 terminals to proceed balance and imbalance tests with DC offset
options. This is to ensure the absolute balance of CMRR 3.0E output signals and increase the precision of
CMRR test.
The following test procedures are all followed the requirements stated in IEC80601-2-26 and can be taken
as test examples of CMRR 3.0E. Due to the different naming rules between EEG and ECG standards,
hereby we use Ch1, Ch2...etc, to prevent from further confusions.
1.
Set up a noise-free test environment.
2.
Disconnect electrode cables
3.
Setting CMRR 3.0E
“Standard” to IEC
-2-26
4.
Select “Supply Voltage” to
2.0 Vrms and “
Frequency
”
to
“
50
Hz” or “
60 Hz
”
5.
Adjust Coarse and Fine knobs until Inner shield (Vc) is
~1.000 Vrms
6.
Connect Ch1 to RA, Ch2 to LA, Ch3 to LL, Ch4 to V1, Ch5 to
V2, Ch6 to V3, Ch7 to V4, Ch8 to V5 and short Ch9 with Chn and connect to V6.
