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The Attenuation / Range Switch is used to select between the two voltage ranges supported by the probe,
●
see the table below. The oscilloscope vertical range scale can be set to the range ratio below for correct
oscilloscope vertical scaling. Note that the probe can be damaged if too high a voltage is applied to it,
therefore always check the voltage range before connecting to a DUT.
T3HVD1500-70
T3HVD1500-200
T3HVD7000-100
The bandwidth selection button allows selection between the probes' default setting of Full bandwidth or 5
●
MHz. An alternative is to use a bandwidth limit setting within the measurement oscilloscope. Most
oscilloscopes have a bandwidth limit capability. Limiting the bandwidth will reduce the noise in
environments where the full bandwidth of the probe is not needed.
The audible range overload switch will turn on or off a buzzer that indicates when the probe is being used
●
beyond its maximum voltage. Immediately reduce the measurement voltage to avoid damage to the
probe, or switch to the higher voltage range if the probe is being used on its lower voltage range.
The probe output BNC connector can be connected to any oscilloscope with a BNC and
●
impedance using the supplied BNC to BNC cable. If the oscilloscope input impedance is set to 50Ω then
the measured oscilloscope voltage will be incorrect.
Power for the T3HVD probes can be supplied from the included USB power supply or from a USB socket
●
built into the oscilloscope. The probe has a standard USB type B interface.
The probe default settings are: High voltage range, full bandwidth and audible over voltage alarm on. The
●
probe will automatically save its state before power off.
To setup the probe to make a measurement first connect it to the oscilloscope using the BNC to BNC
●
cable. Attach the power to the probe. Select the correct voltage measurement range (low / high)
depending on the
DUT. Set the oscilloscope vertical scale attenuation ratio according to the probe voltage
range selected, and set the oscilloscope measurement range. Connect the probe measurement cables to
the DUT using the supplied accessories.
After measuring remove the probe from the DUT and power off the probe by removing the USB power
●
supply.
Adjusting the probe offset
If the output offset drifts from zero then it can be adjusted using the following method.
Allow the probe 30 minutes to warm up. Connect the measurement probe tips together and check to see
●
if the oscilloscope is showing the probe output on the zero volts line. Note when making the probe offset
measurement that the oscilloscope should also be allowed time to warm up and that there should be NO
vertical offset set on the oscilloscope.
Momentarily power off the T3HVD probe. Hold down the ATTENUATION and BANDWIDTH buttons on
●
the probe, and power the probe
50 x
500 x
50 x
500 x
100 x
1000 x
on.
+ 150 V
+ 1500 V
+ 150 V
+ 1500 V
+ 700 V
+ 7000 V
1MΩ input
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