Tektronix TCPA300 SERIES, Instruction Manual

Page: 143 / 205

TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
6- 7
TCP305 and TCP312 Adjustments
The TCP305 and TCP312 Current Probes have one characteristic that is
adjustable--DC gain. The following text describes the DC gain adjustment
procedure. Tolerances that are specified in these procedures apply to the current
probes and do not include test equipment error.
Required Test Equipment
To perform the adjustment procedure in this section, you will need the test
equipment listed in Table 6--5. The test equipment must meet or exceed the
specifications listed. The test procedure may need to be changed if the recom-
mended equipment is not used.
Table 6- 5: Required test equipment
Qty Item Description
Recommended
equipment
1 AC Current Source ACA: 0.25% accuracy, 0 to
±
1.5 A, square wave output Wavetek 9100
1 Digital Multimeter ACV: <0.1% accuracy 5
1
/
2
digit resolution Keithley 2700
1 Termination 50
Ω,
0.1% precision, BNC connector, feedthrough Tektronix part number 011-0129-00
1 BNC Cable
1
50
Ω
, 0.76 m (30 in) long Tektronix part number 012-0117-00
1 Adapter BNC to Dual Banana Tektronix part number 103-0090-00
1 DC Current Loop 5 turns 18 AWG coated wire Refer to page 5--4
1
Provided as a standard accessory with the TCPA300.
Accessing the Adjustments
Figure 6--3 shows the location of the DC gain adjustment in the lower probe half.
DC Gain adjustment
Figure 6- 3: TCP305 and TCP312 DC gain adjustment location