Agilent Technologies N2771A Bedienungsanleitung

User’s Guide

Agilent Technologies N2771A 15 kV High Voltage

Probe

WARNING This high voltage probe is designed to prevent accidental shock to the operator when properly

used. This operating note must be read and understood prior to using the probe. Improper

procedures or incorrect analysis of the measurement situation can result in serious shock.

General Information

The Agilent Technologies N2771A High Voltage Divider Probe is an accessory to be used with analog

or digital oscilloscopes having input resistance of 1 MΩ(±1%) and nominal input capacitance between

6 and 20 pF. The Agilent Technologies N2771A is a 1000:1 divider which extends the voltage

measurement capability to 15 kV dc or 10 kV rms ac (30 kV peak).

Characteristics (Not Warranted)

Maximum Input Voltage Temperature Coefficient

DC Voltage: 15 kV

AC Voltage: 10 kV RMS

PEAK Voltage: 30 kV

Less than 200 ppm/ °C

Compensation Range Division Ratio

For input capacitance of 6 pF to 20 pF 1000:1

Bandwidth Pollution Degree 2

50 MHz (-3 dB)

Input Resistance Operating Temperature

1 GΩ, when terminated by 1 MΩ0°C to +50 °C

Cable Length: Storage Temperature:

2 meter −20 °C to +70 °C

Altitude: Humidity

Up to 4,600 meters (15,000 ft) Up to 80% relative humidity at +40 °C

Voltage Derating

The following graph shows the voltage versus frequency derating curve for the Agilent N2771A High

Voltage Probe.

Voltage Versus Frequency Derating Curve

Frequency Compensation Adjustment

The N2771A High Voltage Probe has a Frequency Compensation adjustment that compensates for

the input capacitance of the oscilloscope being used with the probe.

Use a square-wave generator set for approximately 100 Hz output. Proceed with the following steps

for frequency compensation.

1Connect the probe to the oscilloscope.

2Connect probe tip to square-wave generator.

3Adjust the square wave generator for approximately 10 volts amplitude.

4Adjust the oscilloscope time base for 20 usec/div.

5Use a trimmer tool to adjust the compensation capacitor for the flattest pulse top. See the figure

below for the location of the adjustment.

Frequency Compensation Adjustment

Safety Precautions

• This high voltage probe must only be used by personnel who are trained, experienced, or

otherwise qualified to recognize hazardous situations and who are trained in the safety

precautions that are necessary to avoid possible injury when using such a device.

• Do not work alone when working with high voltage circuits

• For your own safety, inspect the probes for cracks and frayed or broken leads before each use.

If defects are noted, DO NOT use the probe.

• Hands, shoes, floor and work bench must be dry. Avoid making measurements under humid,

damp or other environmental conditions that might effect the safety of the measurement

situation.

• It is advisable to turn the high voltage source off before connecting or disconnecting the probe.

• The probe body should be kept clean and free of any conductive contamination. Refer to the

section on cleaning.

Operation

1Connect the probe to the BNC input of the oscilloscope.

2Select the desired volts/division range. (If you can set probe attenuation on the oscilloscope,

set it to 1000:1)

3Whenever possible, turn the high voltage source off before making any connections.

4Connect the divider probe ground lead (alligator clip) to a good earth ground or reliable chassis

ground.

5Before turning on the high voltage source, make sure that no part of the person holding the

probe is touching the device under test. Once this is certain, turn on the high voltage source.

6Measure the voltage under test and observe the waveform on the oscilloscope. Remember the

actual voltage is 1000 times greater than the oscilloscope waveform if the probe attenuation

has not been set to 1000:1.

7Turn off the high voltage source

8Disconnect the Agilent N2771A High Voltage Probe from the high voltage source BEFORE

disconnecting the ground clip lead.

WARNING • Do not attempt to take measurements from sources where the chassis or return lead is not

grounded

• The ground lead is critical to the safe operation of the probe. Failure to make this connection

when making high voltage measurements may result in personal injury or damage to the probe

or oscilloscope. This connection must always be made BEFORE the probe tip comes in contact

with the high voltage and must not be removed until the probe tip has been removed from the

high voltage source.

• Do not connect the ground clip lead to the high voltage source for any reason.

• Do not make any floating measurements with the Agilent N2771A High Voltage probe.

Cleaning

• Clean only the exterior probe body and cables. Use a soft cotton cloth lightly moistened with

a mild solution of detergent and water. Do not allow any portion of the probe to be submerged

at any time.

• Dry the probe thoroughly before attempting to make voltage measurements.

• Do not subject the probe to solvents or solvent fumes as these can cause deterioration of the

probe body and cables.

Manual Part Number

N2771-92001

$

Printed in Malaysia

Agilent Technologies

1900 Garden of the Gods Road

Colorado Springs, Colorado 80907

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