The remaining controls and features of the probe are located on the probe head.
Probe inputs
The maximum voltage that the probe inputs can accept depend on the probe model and the measurement points.
For example, the THDP0200 probe (shown) can measure a maximum of 1,000 V
RMS
CA
T II between either input and ground, and a
maximum difference of 1,500 V (DC + peak AC) between the (–) and (+) inputs. These input ratings are valid for both range settings.
The other probes covered in this manual have different limits; refer to Specifications.
CAUTION: Do not use these probes above the input limits shown on the probes. The input voltage limits vary by probe model.
Overrange indicator
The OVERRANGE indicator lights red if the voltage of the input differential signal exceeds the linear range of the range setting. When this
happens, the signal on the probe output does not accurately represent the signal on the probe input.
WARNING: The Overrange indicator does not detect overrange condition of common-mode voltages or voltage-to-earth potential
at the probe inputs. The Overrange indicator only detects dif
ferentially between the + and – inputs (not relative to ground).
Do not exceed the common-mode voltage or input voltage-to-earth ratings of the probe when taking measurements. See
Overrange detection on page 37.
If you are not sure, make a single-ended measurement of each point you are intending to measure differentially first. Make a
single-ended measurement by tying one input lead to ground (the "–" input) and then connecting the other lead (the “+" input) to
the points of interest, one at a time.
Voltage range button and indicators
Press the RANGE button to select between the voltage range (attenuation) settings of the probe. The voltage range is indicated by two
LEDs on the probe and may be displayed on the oscilloscope screen, depending on the oscilloscope model.
The OVERRANGE LED lights if the applied voltage exceeds the selected range. T
o extinguish the LED, select a higher range. If a higher
range is not available, do not attempt to take the measurement with the probe.
Probe operating information
High Voltage Differential Probes THDP0100/0200 and TMDP0200 User Manual 17
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