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Precision 50 kV AC+DC probe w/accessories

  • Handles up to ±50 kVDC peak; 35 kVAC RMS
  • Measures AC signals to 1.0 MHz
  • ±5 V output range (10,000:1 divider ratio)
  • Low impedance output compatible with common meters and oscilloscopes
  • Includes power supply, cables and probe tips

Model HVP-333 is a precision, high voltage probe that allows low-level voltmeters and oscilloscopes to safely and accurately measure DC and AC voltage up to ±50 kV DC and 35 kVrms, respectively. The probe's internal circuitry is powered by an external 5 VDC power supply (included).

Low impedance output

The probe features an active, low-impedance analog output which can be directly connected to hand-held meters, precision lab voltmeters, and oscilloscopes. Unlike passive probes, there is no need to match this probe's output impedance to the input impedance of your measurement instrument.

Excellent accuracy

The dividers have precise 10,000:1 ratios, resulting in AC accuracy of ±1% for frequencies up to 1.0 MHz, and DC accuracy of ±0.01%, with calibration traceable to NIST.

What's included

A complete set of essential accessories is included with the probe:

  • Grounding cable
  • Output cable, 250CBL
  • Power cable, USBCBL
  • Power supply, 5 VDC, 333PS
  • Probe tip, pointed, 250P
  • Probe tip, corona ball, 250B
  • Connector insert for probe tips, 250S
  • HVP-333 user's guide
  • Unit calibration data

Probe Tips

Three standard, interchangeable tips are available:

PN Image Description
250B Corona ball tip (included). This probe tip has a large radius of curvature that helps to minimize arcing to the tip when making and breaking high voltage connections. The contact end has an opening that serves as a jack for standard banana plugs. A connector insert (PN 250S) is required to attach this tip to the probe.
250P Pointed tip (included) for probing circuitry in confined spaces where a corona ball won't fit. The contact point has a moderate radius of curvature to reduce arcing, and extended length to allow selective probing. A connector insert (PN 250S) is required to attach this tip to the probe.
250H Hook tip (not included). This tip allows the probe to hang on a suitably shaped high voltage electrode for hands-free operation. It screws directly into the probe and does not require a connector insert.
250S Connector insert (included). A connector insert is required to attach the probe to a 250B or 250P probe tip. One end screws into the probe and the other into the probe tip. A single insert can be shared by multiple tips, though it's handy to have two if the tips are changed frequently.

Optional protective case

The probe is a precision instrument that should be protected when not in use. An optional instrument case is available for this purpose:

PN Image Description
252CASE Instrument case. This sturdy case will accommodate a probe, a complete set of probe tips, connector inserts, and instruction manual. It securely holds the probe and accessories in a shock absorbing, custom fitted molding. The hinged handle allows for easy handling and compact storage.
Maximum input voltage±50 kVDC peak; 35 kV AC (RMS)
Voltage divider ratio10,000:1
Input impedance1,000 MΩ/10 pF
DC accuracy±0.01 %
AC accuracy±1.0 % @ 10 Hz to 10 kHz
Temperature coefficient30 ppm/°C (typical)
Operating temperature0 to 40°C
Altitude< 2000 m
Relative humidity (max)80% at 31°C, 50% at 40°C
Output signal connectorBNC coax
Power input connectorUSB, Mini-B
Weight1.5 lbs
Model Description Price Order Qty.
1 2–9
HV Probe
333 Precision 50 kV AC+DC probe w/accessories $650 $585
Replacement Probe Tips
250B HV probe tip, corona ball $47 $47
250P HV probe tip, pointed $18 $18
250H HV probe tip, hook $14 $14
250S HV probe tip connector insert $2 $2
Replacement Cables
USBCBL 72-inch Cable, USB A-Mini to B $10 $10
250CBL 36-inch multimeter cable for CPS high voltage probes $24 $24
Probe Case
252CASE Storage case for 50 kV probes $175 $175
Viewing Block
HVT30 30 kV viewing block with AC-coupled out $600 $600