CMRR 3.0E | User Manual
21
Figure 6-10, IEC-2-26 test sequence window
7
Caution
7.1
Baseline noise test
When the CMMR 3.0E is connected to the power supply, it is impossible to eliminate high frequency noise
from switching power supplies. Such high frequency noise is unlikely to affect the test. However, in case
of doubt, the operator can select the “NOISE” setting, turn the
unit off and remove the power supply. The
internal relays in the isolated circuit are a special latch type and will hold the NOISE setting even with the
power removed. This allows the test to be performed without any concern from noise arising from
internal or external switching power supplies.
7.2
Battery power consumption for DC offset function
CMRR 3.0E uses a built-in battery supplying the power 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.
7.3
Vs voltage drop with the multimeter of
1MΩ
input impedance
“Vs” output of
CMRR 3.0E would have a 0.4% voltage drop when
a multimeter with 1MΩ input
impedance is used to monitor “Vs” output.
WhaleTeq recommends to use a 10MΩ input multimeter (ex. Fluke
87V) to minimize the voltage drop
range.
7.4
QC PASS Label
Warranty void if QC PASS label is removed or tampered with.
