User Manual - TRS-RenTelco

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MIU G input BNC to the B input BNC. The frequency response of the MIU
B channel should be visible.
16. Repeat steps 11–13 for the B channel.
17. CHECK – that the B channel response at 1500 MHz is less than 3.0 dB
down.
18. Disconnect the MIU CH2 coaxial cable from the BNC female/female
adapter, and reconnect it the VM5000 CH2 input. Now disconnect the MIU
CH3 cable from the VM5000. Attach this cable to open end of the BNC
female/female adapter. Move the min-loss pad and cable currently connected
to the MIU B input BNC to the R input BNC. The frequency response of the
MIU R channel should be visible.
19. Repeat steps 11–13 for the R channel.
20. CHECK – that the R channel response at 1500 MHz is less than 3.0 dB
down.
21. Disconnect the MIU CH3 coaxial cable from the BNC female/female
adapter, and reconnect it the VM5000 CH3 input.
Example Table 4
Calculations
The series connected min-loss pads measure –0.6 dB at 1500 MHz. The MIU G
channel measures –1.6 dB at 1500 MHz with one min-loss pad, and –1.4 dB at
1500 MHz with the second min-loss pad. The corrected G channel 1500 MHz
response is calculated to be –1.2 dB (column C6). See Table 5.
Table 5: Sample Table 4 worksheet
C1–seriesconnected
min-loss
pad (“A”+”B”)
1500 MHz response
(dB)
C2 – Average
1500 MHz response
of
single min-loss
pad (dB)
C3–MIU
1500 MHz response
with
min-loss pad
“A” (dB)
C4–MIU
1500 MHz response
with
min-loss pad
“B” (dB)
C5 – Average
MIU 1500 MHz
response (dB)
GCH -0.6dB -0.3dB -1.6dB -1.4dB -1.5dB -1.2dB
BCH
RCH
C6 – Corrected
MIU 1500 MHz
response
Equations C2=(C1)/2 C5=(C3+C4)/2 C6=C5 -C2
Test H: H/V Inputs WB Mode Bandwidth
This test checks the bandwidth of the H and V inputs when the HV WB Path is
active. The specification is less than 3dB down at 320 MHz.
VM5000 Automatic Video Measurement Set Option VGA Read This First 19