Picotest
Picotest J2152A High Speed Probe Calibrator
Picotest J2152A High Speed Probe Calibrator
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The Picotest J2152A is a calibrator for oscilloscope probes. Most 50 Ohm based probe calibrators give an incorrect response. The J2152A works by using a hyper fast pulse step whose source has a near-zero impedance which is much less than the probe tip impedance. This is accomplished with a unique ultra-high-speed GaN driver. The pulse response can then be optimized providing the correct compensation.
Key Features
- Calibrate High Bandwidth Probes properly
- Improve probe compensation accuracy
- Works with all types of probes
- Pocket-sized, portable, USB powered
- Evaluate probe response above the probe bandwidth and without the damping introduced by a 50 Ohm signal source
- Compensate the probe with the oscilloscope being used for the measurement
How Does The High-Speed Probe Calibrator Work?
A hyper-fast GaN pulse generator charges the probe tip to a programmable voltage, up to 100V. The probe is then discharged using a 0.5 Ohm GaN FET. The result is a time domain response as seen in the ringing here. The probe tip capacitance is directly measured using the rise time to charge the probe tip. This allows the probe to be properly compensated.
Additionally, knowing the capacitance, the ringing frequency and the damping, it's possible to completely model the probe using inverse Laplace transformation. The calibrator has a selectable voltage option, allowing easy scaling of the reference waveforms on the scope.
| Specifications | ||||
| Characteristic | Minimum | Typical | Maximum | |
| USB Power Input | 4.75 | 5.00 | 5.25 | |
| USB Cable Connectors | USB Type-A USB-Micro |
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| Input Current | 100mA | 150mA | 200mA | |
| Probe Voltage1 | 10 VPK | 25, 50, 75VPK | 100VPK | |
| Probe Voltage Accuracy2 | 2% | |||
| Probe Pull-Up Resistance | 10k | |||
| Probe Discharge Resistance | 0.4 Ohms | 0.6 Ohms | 0.8 Ohms | |
| Probe Discharge Fall Time3 | 200pSec | 250pSec | ||
[1] User-Selectable Probe Voltages
[2] Percentage of Selected Probe Voltage
[3] Measured with zero tip capacitance using e-field integration.
Caution: To avoid equipment damage and/or severe injuries or death ensure that the absolute maximum ratings are observed and not exceeded at all times.
Picotest J2152A High Speed Probe Calibrator
Frequently Asked Questions
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