THDP-TMDP_Instructions-077054003.pdf - 第47页

T ekVPI Calibration Fixture This calibration fixture is required to complete a performance verification and gain accuracy adjustment procedures on the probes. It provides power to the probe and routes the probe output si…

Performance verification

Use the following procedures to verify the warranted specifications of the probes. Before beginning these procedures, photocopy the test

record and use it to record the performance test results. See Test record on page 50. The recommended calibration interval is one year.

These procedures test the following specifications:

• Gain accuracy

• Rise time

Required equipment

The equipment required to perform the performance verification procedures are shown in the table below. The types and quantities of

connectors may vary depending on the specific equipment you use.

Table 9: Equipment required

Description Minimum requirements Example product

Oscilloscope 500 MHz Tektronix MSO/DSO4000

Generator ±100V variable amplitude, 100 Hz square wave, calibrated Fluke 9100

Pulse generator ≥50 V, 200 ns pulse width, ≤500 ps rise time, 1 kHz Avtech AVR-E2-B-W-P

Probe calibration fixture TekVPI input Tektronix part number 067-1701-xx

Digital Multimeter (DMM) 100 mV and 1 V true RMS AC ranges, <±0.3 % accuracy Tektronix DMM4040/4050

Cable Coax, BNC, 50Ω, 36 in Tektronix part number 012-0482-xx

Adapter BNC female-to-SMA male

Tektronix part number 015-1018-xx

Adapter BNC female-to-dual banana female Tektronix part number 103-0090-xx

Adapter BNC female-to-female Tektronix part number 103-0028-xx

Adapter BNC male-to-dual banana male Fluke PM9081

Termination BNC feedthrough, 50Ω Tektronix part number 011-0049-xx

Attenuator BNC, 50Ω, 2X Tektronix part number 011-0069-xx

Probe hook tips (2) Included with probe accessory kit Tektronix part number AC280–FL

Performance verification

TekVPI Calibration Fixture

This calibration fixture is required to complete a performance verification and gain accuracy adjustment procedures on the probes. It

provides power to the probe and routes the probe output signal out through an SMA connector on the back of the fixture. The signal can

then be measured with another instrument, such as a precision DMM, to check and adjust the gain accuracy of the probe. Order T

ektronix

part number 067-1701-xx.

Figure 15: TekVPI calibration fixture

est procedures

WARNING: These procedures require the application of high voltage to the inputs of the probes. Only qualified personnel

should perform any testing with voltage levels exceeding 30 V

rms

. All pertinent safety rules and guidelines for elevated voltage

measurements should be followed and adhered to.

Test setup

1. T

urn on the oscilloscope.

2. Connect the probe to any channel of the oscilloscope.

3. Verify that the LEDs light on the probe.

4. T

urn on the remaining test equipment and let the probe and equipment warm up for 20 minutes.

5. Make a copy of the test record to tabulate the test results. See Test record on page 50.

Performance verification

High Voltage Differential Probes THDP0100/0200 and TMDP0200 User Manual 47

DC gain Accuracy

WARNING: Dangerous voltages will be present on the calibration generator output terminals and connection cables. Always verify

that the generator is in the standby mode before you make any connections to the generator

1. V

erify that the generator output is off.

2. Connect the probe calibration fixture to any channel (1–4) on the oscilloscope.

3. Connect the probe output to the probe calibration fixture and the probe inputs to the generator.

4. Connect the output of the probe calibration fixture to the inputs of the DMM, using coax cables and adapters. Set the DMM to AC volts.

5. Set the probe attenuation to the lower range for the probe that you are testing. See T

able 10 on page 48.

6. Set the generator square wave output frequency and RMS voltage (main display) to the values shown in the table for the probe that

you are testing.

7. Enable the generator output and record the probe output (as displayed on the DMM) in the test record.

8. Disable the generator output.

9. Set the probe attenuation to the next range and then repeat steps 6 on page 48 through 8 on page 48.

Table 10: DC gain accuracy equipment settings

Probe Generator output Probe output voltage

Model Range Voltage (rms) Frequency Expected (rms) Measured (rms)

THDP0100 600 V 75 V 100 Hz 750 mV ±15 mV

6000 V 75 V 100 Hz 75 mV ±15 mV

THDP0200 150 V 25 V 100 Hz 500 mV ±10 mV

1500 V 75 V 100 Hz 150 mV ±3 mV

TMDP0200 75 V 20 V 100 Hz 800 mV ±16 mV

750 V 60 V 100 Hz 240 mV ±4.8 mV

Performance verification