Performance Verification
10
TCA75 Impedance Conversion Adapter Instructions
Attenuation Accuracy
1.
Set up the equipment as follows:
Multimeter #1
Setting
Mode
DCV
Range
10 V (3 digit resolution)
Multimeter #2
Setting
Mode
DCV
Range
1 V (3 digit resolution)
Power Supply
Setting
DCV
1.000 V
2.
Connect the equipment as shown in Figure 6.
SMA to BMA
adapter
+
--
Multimeter #1
Power supply
+1.000 V
75
Ω
BNC cable
Multimeter #2
+.407 V
+1.000 V
50
Ω
BNC cable
SMA barrel
SMA to BNC adapter
50
Ω
Termination
(011-0049-02)
75
Ω
T
adapter
TCA75 A
dapter
BNC to banana
adapter
BNC to banana
adapter
75
Ω
BNC
cable
BNC to banana
adapter
Figure 6: Measuring the attenuation accuracy
3.
Power on the power supply, and adjust the output until multimeter #1 reads
1.000 V.
4.
Check that the voltage is attenuated by 2.46X
±
1.5% (multimeter #2 reads
0.402 V to 0.414 V).
