Voltage Probes
Probes are used for terminal voltage measurement, also on cables, output sockets, PCB traces. In many cases high input impedance and low capacitance is required for this purpose. Active Probes may not be used for general Interference measurement, as pulses could by far exceed the linear voltage range. This not only causes limiting and distortion effects but also intermodulation that changes the frequency distribution of spectral components.
These resistive dividing probes are perfectly linear and free of these effects.
By the use of an AC and pulse-compatible input blocking capacitor (that is also free of partial discharge effects), EMI measurement is also possible on AC power lines up to 250 V ac or DC sources up to 500 V.
High-Voltage Probes up to 10 kV (20 kV) DC or 2 kV AC with 1500 Ω input || 4 pF input capacity are available as TK 9420.
For the max. power line voltage of 250 V ac two probes are available with input resistances of 1.5 kΩ, and 2.5 kΩ with the model numbers TK 9420, and TK 9417.
TK 9261 – Active Probe
The TK 9261 is an active high-impedance RF voltage probe equipped with an internal impedance transformer which allows using it with 50 Ω measurement devices (such as spectrum and network analyzers or test receivers).
| Nominal frequency range (±1 dB): | 100 kHz – 100 MHz |
| Useable frequency range:(±3 dB): | 50 kHz – 700 MHz |
| Input damping resistance: | >100 kΩ |
| Input capacitance: | 1.8 pF typ. |
| Output impedance: | 50 Ω |
| Gain: | 0 dB |
| Maximum output level: | 1.4 V peak |
| Maximum input d.c. level: | 500 V |
| Maximum input a.c. level: | 10 Vp-p |
| Output: | N-plug |
| According to: | Renault 36-00-808 |
| Power supply: | +12…15 V |
| 50 mA | |
| DC-connector: | 5.5 mm / 2.5 mm |
| Ambient temperature: | -10° … +60°C |
| Weight: | 300 g |
TK 9422 – High Power Voltage Probe
| Input Impedance: | 5 kΩ || 4 pF |
| Frequency Range: | (9) 150 kHz – 30 MHz |
| Voltage Range: | HF: <100 V |
| AC 50/60 Hz: < 10 kV | |
| DC: < 15 kV | |
| Accurency of Voltage Division: | 150 kHz – 30 MHz ± 2 dB |
| Input Impedance of Test Receiver: | 50 Ω, SWR ≤ 1.1 |
| Internal Coupling Capacitor: | 1.25 nF |
| Terminals: | 4 mm |
| Ground Connection: | insulated litz wire |
| Banana plug 4 mm | |
| Coax cable: | RG 58, 2 m, BNC |
| Audio Frequency Impedance: | 1.25 nF + 5 kΩ |
| Max. Power: | 30 W |
| Weight: | 400 g |
| Dimensions: | 440 mm x 23 mm ∅ |
TK 9421 – High Power Voltage Probe
| Input Impedance: | 1.5 kΩ || 4 pF |
| Frequency Range: | (9) 150 kHz – 30 MHz |
| Voltage Range: | HF: <100 V |
| AC 50/60 Hz: < 10 kV | |
| DC: < 15 kV | |
| Accuracy of Voltage Division: | 150 kHz – 30 MHz ± 2 dB |
| Input Impedance of Test Receiver | 50 Ω, SWR ≤ 1.1 |
| Internal Coupling Capacitor: | 1.25 nF |
| Terminals: | 4 mm |
| Ground Connection: | insulated litz wire, Banana plug 4 mm |
| Coax Cable: | RG 58, 2 m, BNC |
| Audio Frequency Impedance: | 1.25 nF + 1.5 kΩ |
| Max. Power: | 20 W |
| Weight: | 200 g |
| Dimensions: | 380 mm x 23 mm ∅ |
TK 9420 – Voltage Probe
Option: Plug-In Divider VT 9420
The divider (option) can be used to determine the approximate RF-Impedance of unknown EuTs according to CISPR 16-2
| Input Impedance: | 1.5 kΩ || 4 pF |
| Frequency Range: | 9 kHz – 30 MHz |
| Voltage Range: | HF: <30 V |
| AC 50/60 Hz: < 2.5 kV | |
| DC: < 4.4 kV | |
| Freq. Range w. constant Correction of 30 dB: | 20 kHz – 30 MHz |
| Accuracy of Voltage Division: | 30 kHz – 30 MHz ± 1 dB |
| Input Impedance of Test Receiver: | 50 Ω, SWR ≤ 1.1 |
| Internal Coupling Capacitor: | 10 nF |
| Terminals: | 4 mm |
| Ground Connection: | insulated litz wire, Banana plug 4 mm |
| Coax Cable: | RG 58, 2 m, BNC |
| Audio Frequency Impedance: | 10 nF + 1.5 kΩ |
| Weight: | 180 g |
| Dimensions: | 175 mm x 23 mm ∅ |
TK 9417 – RF Probe
| Nominal Input R: | 2.5 kΩ |
| Frequency Range: | 10 kHz – 30 MHz |
| Series Resistor: | 2450 Ω |
| 0.2 W | |
| Series Capacity: | 10 nF 250 VAC |
| Input Current: | 0.79 mA |
| 250 V / 50 Hz | |
| Input Current: | 6.25 mA |
| 250 V / 400 Hz | |
| Input Current-|Z| at 10 kHz: | 2960 Ω |
| eff. shunt Capac.: | ca. 2 pF |