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Schwarzbeck

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Voltage Probes

 

In addition to EMI measurement with LISNs (Line Impedance Stabilisation Networks, Artificial Mains Networks), Probes are used for Terminal or Line voltage measurement.

LISNs are required to feed the Equipment under Test (EuT) with mains power, to reduce external line interference, to offer the EuT a standardized impedance and to route the extracted r.-f. voltage to the EMI receiver.

 

Probes are used for  terminal voltage measure ment, 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 +/- 1 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 +/- 1 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

 

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 +/- 0.5 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 ∅

 

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

 

 

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:
250 V / 50 Hz

 0.79 mA
 

Input Current:
250 V / 400 Hz

 6.25 mA
 

Input Current-|Z| at 10 kHz:

 2960 Ω
 

eff. shunt Capac.:

 ca. 2 pF

 

 

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