Operating basics
To help you use the high voltage differential probes safely and effectively, this section provides important information about safety limits,
operating characteristics, and probing techniques.
Operating limits
The probes have two operating ranges that you select with the RANGE button; the ranges differ between probe models.
To keep within the linear measurement region of the probe, select a range that is above the differential voltage that you are measuring. You
can measure a voltage in the low range that exceeds the low range limit (provided it is within the high range limit of the probe), but it will
overdrive the circuitry of the probe. When this differential overrange occurs, the probe detects the condition and lights the OVERRANGE
indicator. Measurements taken in the lower, more sensitive range when the OVERRANGE indicator is lit are not accurate during the
Overdrive Recovery Time (ORT, typically <20 ns, depending on the probe type).
Do not attempt to measure a differential voltage that is above the high operating range of the probe. Do not exceed the common mode
voltage on either input (+ or – input to ground). See Typical characteristics on page 40. The probe can be damaged if these limits are
exceeded.
Table 3: Differential voltage limits (peak)
Low range High range
Probe model Voltage limit Overload trip level Voltage limit Overload trip level
THDP0100 600 V >600 V 6000 V >6000 V
THDP0200 150 V >150 V 1500 V >1500 V
TMDP0200 75 V >75 V 750 V >750 V
The input signals that you attempt to measure must be considered both for the differential potential between each other and for the
amplitude on each input with respect to ground (the common mode voltage specification). The maximum common mode voltage limits vary
between probes, from 550 V CA
T I for the TMDP0200, to 2300 V CAT I for the THDP0100 probe. You should consider both specifications
when choosing a probe for your measurement task. Some examples that illustrate this are shown on the following pages.
Operating basics
High Voltage Differential Probes THDP0100/0200 and TMDP0200 User Manual 35
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