THDP-TMDP_Instructions-077054003.pdf - 第55页

Accessing the internal adjustments Note: Only probes with serial numbers C020000 and above have internal adjustments. Probes with serial numbers C019999 and below that require adjustments (other than of fset zero) must b…

Offset zero

This is the only procedure that applies to all of the probes and all serial numbers.

Adjustment notes

•

For probes with serial numbers C199999 and below, Offset Zero is the only adjustment that can be done to the probe.

• For probes with serial numbers C020000 and above, Offset Zero is the only adjustment that can be done without removing the back

label.

• The adjustment for each range is independent and does not interact between the ranges.

Procedure

1. Set the oscilloscope offset to 0 volts.

2. Connect the probe inputs together with the hook tips.

3. Press and hold the probe BANDWIDTH LIMIT and RANGE buttons until the OVERRANGE LED on the probe flashes.

4. Release the buttons. The OVERRANGE LED continues to flash, indicating that the digitally-controlled of

fset zero adjustment is

enabled.

5. Use the probe BANDWIDTH LIMIT and RANGE buttons to set the probe offset voltage as close to 0 V as possible, as displayed on the

oscilloscope. The BANDWIDTH LIMIT button decreases the offset voltage and the RANGE button increases it.

6. Press the AUDIBLE OVERRANGE button on the probe to store the adjusted offset value. The OVERRANGE LED stops flashing to

indicate that the offset value is stored and that the adjustment is disabled.

7. Select the remaining attenuation range and repeat steps 3 on page 54 through 6 on page 54.

Adjustments

Accessing the internal adjustments

Note: Only probes with serial numbers C020000 and above have internal adjustments. Probes with serial numbers C019999 and

below that require adjustments (other than of

fset zero) must be returned to Tektronix for service.

WARNING: The remaining adjustments for the probe require you to remove a reusable label from the back of the probe. Y

ou must

replace the label after you complete the probe adjustments. Failure to do so may subject the user to high voltages present in the

probe during measurements. If you need a replacement label, refer to the Equipment Required table for the Tektronix part number.

See Table 14 on page 52.

Remove the reusable back-panel label shown below to gain access to the adjustments. Store the label in a safe place to preserve the

adhesive backing for reuse.

Figure 17: Internal adjustment locations (S/N C020000 and above only)

CAUTION: Y

ou must replace the reusable label after you complete the adjustment procedures. Failure to do so may subject

the user to high voltages present in the probe during measurements. If you need a replacement label, refer to the Equipment

Required table for the Tektronix replacement part number.

Adjustments

High Voltage Differential Probes THDP0100/0200 and TMDP0200 User Manual 55

Gain accuracy

The equipment settings for this test dif

fer between probes. Refer to the table for specific settings for the probe that you are testing. See

Table 15 on page 56.

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.

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

5. Set the DMM to AC volts.

6. Connect the probe inputs to the front outputs of the generator

, using adapters if necessary.

7. Set the probe attenuation to the lower (most sensitive) range for the probe that you are adjusting.

8. 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 adjusting. See Table 15 on page 56.

Table 15: Adjust gain accuracy equipment settings

Probe Generator square wave 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 ±1.5 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

9. Enable the generator output.

10. Adjust the low-range DC gain pot in the probe to

≤2% of the expected output.

WARNING: Use only an insulated tool to make the adjustment. Failure to do so presents a potential shock hazard.

Adjustments