TCP305 and TCP312 Adjustments
TCP305 and TCP
312 Adjustments
The TCP305 an
d 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. (See Table 27.) The test equipment must meet or exceed
the specifications listed. The test procedure may need to be changed if the
recommen
ded equipment is not used.
Table 27: Required test equipment
Qty Item Description Recommended
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 D ual Banana
Tektronix part number 103-0090-00
1
DC Current Loop 5 turns 18 AWG coated wire (See page 4, Making DC Current Loops.)
1
Provided as a standard accessory with the TCPA300.
Accessing the Adjustments
The location of the DC gain adjustment in the lower probe half is shown. (See
Figure 15.)
Figure 15: TCP305 and TCP312 DC gain adjustment location
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual 49
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