TCP305 and TCP312 Performance Verification
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5-21
DC Gain Accuracy
This procedure tests the DC gain accuracy of the TCP305 and TCP312 Current
Probes. In this test you compare the voltage output of the amplifier to a reference
input.
This test uses current loops that you make using wire and 3-inch forms. Refer to
page 5--4 for instructions on making the current loops.
1. Using a BNC cable, connect the amplifier OUTPUT to the 50 Ω feed-
through termination. Attach the termination to a BNC-to-dual banana
adapter. Insert the dual-banana adapter into the digital multimeter DC
voltage input, taking care to maintain polarity.
2. Connect the current loop to the current source as shown in Figure 5--7.
3. Connect the current probe to the PROBE INPUT connector. Do not connect
the probe to the current loop at this time.
Current
source
DMM
+--
+--
5 Turns
Probe
BNC-to-dual
banana adapter
50 Ω Precision
termination
Output
50 Ω Coaxial
cable
(Degauss before
connecting to current loop)
Probe
Current flow
Amplifier
Figure 5- 7: DC gain accuracy test setup for TCP305 and TCP312
Make or verify the equipment settings in Table 5--12:
Table 5- 12: Equipment settings for DC gain accuracy
Digital multimeter
Measurement Ty pe DC volts
Range Autoranging
Current source
Amplitude DC Amps
Equipment C onnections
Equipment Sett ings
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