THDP-TMDP_Instructions-077054003.pdf - 第57页

1 1. Disable the generator output. 12. Set the probe attenuation to the next range and set the generator output voltage to the value shown in the table. 13. Enable the generator output and adjust the high-range DC gain p…

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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
56
11. Disable the generator output.
12. Set the probe attenuation to the next range and set the generator output voltage to the value shown in the table.
13. Enable the generator output and adjust the high-range DC gain pot in the probe to
≤2% of the expected output.
14. Disable the generator output.
DC CMRR
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 both of the probe inputs to the red (+) banana connector on the front output terminals of the generator. Use a BNC-banana
adapter if necessary.
3. Set the output of the generator to the voltage and frequency listed in the table.
Table 16: DC CMRR test equipment settings
Probe Generator output
Model Range Voltage (rms) Voltage (p-p) Frequency
THDP0100 600 V 353.53 V 1000 V 40 Hz
THDP0200 150 V 200 V 566 V 40 Hz
TMDP0200 75 V 353.53 V 1000 V 40 Hz
4. Set the oscilloscope horizontal to 10 ms/div and bandwidth to 5 MHz.
5. Set the probe attenuation to the lower (most sensitive) range of the probe.
6. Enable the generator output. Set the oscilloscope vertical to display the signal. For a stable display, connect the generator Sense
output to another channel and trigger off of that channel.
Adjustments
High Voltage Differential Probes THDP0100/0200 and TMDP0200 User Manual 57
7. Using the narrow-bladed tool, adjust the DC CMRR pot in the probe to minimize the amplitude of the waveform displayed on the
oscilloscope. Use averaging or hi-res filters to make viewing the 40 Hz signal easier
.
WARNING: Use only an insulated tool to make the adjustment. Failure to do so presents a potential shock hazard.
8. Disable the generator output.
LF compensation
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
.
Note: The TMDP0200 probe only has one long-term +LF adjustment and one long-term –LF adjustment. The other two probe
models have two long-term +LF adjustments and two long-term –LF adjustments each.
1. Verify that the generator output is off.
2. Connect the probe inputs to the signal output connector on the back of the generator, using adapters if necessary. Connect the red
probe lead to the signal, and the black lead to ground.
3. Set the probe attenuation to the lower range for the probe that you are adjusting.
4. Set the oscilloscope horizontal to 4
μs/div, acq mode = average 16.
5. Set the generator fast-rise (rise time waveform) output frequency to 10 kHz.
6. Set the generator fast-rise output voltage to 50 V
p-p
.
Table 17: LF compensation test equipment settings
Probe Generator output
Model Range Voltage (p-p) Frequency
THDP0100 600 V 50 V 10 kHz
Table continued…
Adjustments
58