Extech Instruments 7630 Operation Manual page 72

MD Block Diagram
MD7：RUN MD IEC60950、
IEC61010-1 Fig A.2 (2Kohm)
MD2：IEC60990(Fig 5 U1 &
U3) , IEC60598-1
4.3.3.7 Probe Configuration
Please use the up and down arrow keys or the ENTER key and scroll the highlighted area to
the Probe parameter. The display will appear as follows:
The Probe configuration is controlled by the relays SH, SL and Probe Switch shown in Figure
2 and are set by the Probe soft key. These three relays configure the current measuring
device into four possible positions. Repeatedly pressing the Probe soft key allows the
selection of the four different states. The four positions are described in the table below.
Probe (Measuring Device
Position)
Ground To Line
Probe-HI To Line
Probe-HI To Probe-LO
66
MD1：IEC60990(Fig 4 U1 & U2)、
IEC60598-1、IEC60950-1、
IEC60065、 IEC61010、IEC60335-1
Switch
SH SL Probe Switch
A A A
B A A
B B A
MD5：UL544NP、UL484、UL923、
MD6：UL1563
MD3：IEC60601-1
Agency Test Application
Earth Leakage Current
Surface to Touch Current
Surface to Surface Leakage Current
UL471、UL867、UL697
MD4：UL544P