19 
 
4) Replace the specified specification of the fuse. 
 5) Put the fuse holder into the card slot. 
 
Attention 
 To avoid electric shock or fire, use the specified fuse and ensure that the fuse bracket 
is not short-circuited. 
 
 
11.  Voltage selector 
Select the correct voltage range according to the AC specification you are using. Two 
AC input voltage ranges are available: 110 V and 220 V. 
 
Models and Options 
 
Model 
Reading 
resolution 
Maximum 
reading rate 
Dc voltage 
accuracy 
11 kinds of 
measurements 
Standard interface 
HDM3055  5½  30Krdgs/s  150ppm 
AC/DC voltage/  
AC/DC current/ 
2&4wire resistance/ 
frequency/ 
period/ 
diode/ 
conductance/ 
thermocouple/ 
temperature 
USB,232,485(front single 
panel input) 
HDM3055S  5½  30Krdgs/s  150ppm 
USB,232,485(rear single panel 
input) 
HDM3055A  5½  30Krdgs/s  150ppm  USB,232,485 
HDM3055B  5½  30Krdgs/s  150ppm  USB,232,485,LAN 
HDM3055H  5½  30Krdgs/s  150ppm  USB,232,485,LAN,GPIB 
HDM3065  6½  30Krdgs/s  35ppm 
USB,232,485(front single 
panel input) 
HDM3065S  6½  30Krdgs/s  35ppm 
USB,232,485(rear single panel 
input) 
HDM3065A  6½  30Krdgs/s  35ppm  USB,232,485 
HDM3065B  6½  30Krdgs/s  35ppm  USB,232,485,LAN 
HDM3065H  6½  30Krdgs/s  35ppm  USB,232,485,LAN,GPIB