ComSonics Inc. 2007HHD Manuale Utente

10

 

 

 

1.  Locate the Qualifier VMD equipped vehicle about 50 to 75 feet from the test 

residence. 

2.  Set the VMD power switch to ON. 
3.  Disconnect the CATV drop cable from the residence ground block or splitter. 

As an alternative method, disconnect and test at the tap or pedestal.  

4.  Use a BNC-to-F adapter and a short jumper cable to connect the Qualifier 

HHD to the open residential terminal. If using the tap or pedestal method, con-
nect the HHD to the free end of the drop cable. If needed, use a quality exten-
sion cable and a F-81 barrel. Tighten connections as needed. 

5.  Power on the HHD. 
6.  Press the HHD Button to activate the measurement 

sequence. 

7.  The HHD displays ‘- - dB’ briefly and then shows the 

shielding integrity reading. PASS or FAIL may also be 
displayed, based on the Threshold value setting.  

8.  Repeat the measurement sequence a second time to 

insure the reading.  

•  For a low integrity reading from a tap or pedestal 

location, retest from the residence ground block or 
splitter location. 

•  For a low integrity reading when connected to the 

input of the residential splitter, disconnect each ca-
ble from the splitter output (one at a time) and retest 
to determine the path of ingress. 

•  If the PASSFAIL label appears, the indication of not 

clearly receiving the VMD test signal, check the HHD 
connection and the VMD operation. Integrity read-
ings in the range of 25 to 80 with the PASSFAIL 
label showing may indicate excessive noise signals. 

9.  Disconnect the HHD jumper cable and reconnect the drop cable. 
10.Weather-proof the connection as needed.