User’s Guide
Publication number N2772-92002
September 2002
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For Safety, Regulatory, and publishing information, see the pages at the back of this book.
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All Rights Reserved.
N2772A Differential Voltage Probe
Contents
Inspect the Probe 3
Compatibility 4
Probe Parts Supplied 5
Characteristics and Specifications 6
Electrical Characteristics 6
Input Characteristics 7
Output Characteristics 7
Environmental Specifications 7
Safety Specifications 8
Using the N2772A Probe 10
Powering the N2772A 10
External Power Supply 10
Install or Replace the Battery 11
Oscilloscope Input Characteristic 11
Select the Correct Attenuation 12
Measurement Tips 12
Calibration Testing Procedures 14
Cleaning the Probe 18
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N2772A Differential Voltage Probe
Inspect the Probe
Inspect the Probe
❏ Inspect the shipping container for damage.
Keep a damaged shipping container or cushioning material until the contents of
the shipment have been checked for completeness and the probe has been
checked mechanically and electrically.
❏ Check the accessories.
Any accessories that were supplied with the probe are listed in “Probe Parts
Supplied” this manual.
• If the contents are incomplete or damaged, notify your Agilent Technologies
Sales Office.
❏ Inspect the instrument.
• If there is mechanical damage or defect, or if the probe does not operate
properly or pass calibration tests, notify your Agilent Technologies Sales
Office.
• If the shipping container is damaged, or the cushioning materials show signs
of stress, notify the carrier as well as your Agilent Technologies Sales Office.
Keep the shipping materials for the carrier’s inspection. The Agilent
Technologies office will arrange for repair or replacement at Agilent
Technologies’ option without waiting for claim settlement.
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N2772A Differential Voltage Probe
Inspect the Probe
N2772A Differential Voltage Probes
The N2772A differential probe allows you to safely measure floating circuits, as
high as 600V dc peak to ground, with the oscilloscope grounded. It is ideal for
many applications such as motor speed controls, power supply designs and
electronic high-power converters.
With 20 MHz bandwidth, switchable attenuation of 20:1 and 200:1, and a
maximum voltage input of 600V, it provides the versatility for a broad range of
applications including high-voltage circuits.
Eac h pr ob e co mes with sh arp pro be ti ps f or use on sm all co mpon en ts and in tigh t
places and alligator clips for connecting to larger cables.
The probe is powered by a 9V battery or by using a separate power supply, the
N2773A.
Compatibility
The N2772A differential probe is compatible with any oscilloscope that has the
following features:
• 1 M input impedance
Ω
• Can display 30V peak input
• Has BNC input
4
N2772A Differential Voltage Probe
Inspect the Probe
Probe Parts Supplied
The following diagram and table show the parts supplied with the N2772A Probe.
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1
Parts for N2772A Probe
Item Description Part Number
1 Differential voltage probe N2772-60001
2 Probe tips 5063-2188
3 Banana jack alligator - black 5063-2189
4 Banana jack alligator - red 5063-2187
5 Hook Retractable - black 5063-2191
6 Hook Retractable - red 5063-2190
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5
N2772A Differential Voltage Probe
Characteristics and Specifications
Characteristics and Specifications
Characteristics and specifications for the N2772A Differential Voltage Probe are
shown below.
Electrical Characteristics
Attenuation ratios 20:1 and 200:1 (Selectable via switch on probe.)
Bandwidth (into 1 M , 50 pF) 20 MHz
Accuracy 2.5% into 1 M
Rise Time 200x: 17.5 ns
High CMRR 80 dB @ 60Hz, 50 dB @ 1 MHz
Input impedence Between inputs: 10 M , 5 pF
Output impedence 50
Noise 200x: <2 mVrms
Offset <=10 mV into 1 M
Switch positions OFF, 200x, 20x
External power Via power adapter N2773A (optional)
Internal power Battery power: Alkaline 9V, IEC6LR61
Power indicators Green LED: ON at normal operation. Blinks at
Auto stand by After 30 minutes, only when battery operated.
*Battery life measured @ 25 C with Duracell® akaline battery. (Delivered with probe.)
Ω
±Ω
20x: 17.5 ns
Ω
Ω
20x: <3 mVrms
Ω
Battery life: 8 hour operation, 400 hour in auto
standby*
standby.
Red LED: ON when battery needs to be replaced.
°
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N2772A Differential Voltage Probe
Characteristics and Specifications
For derating of each input probe (red or black), see the figure below.
Input Characteristics
Input probe tip style Shrouded banana probe tip
Probe cable length 1.5 meter (60 inches)
Maximum input voltage to ground600V CAT III
1000V CAT II
Maximum differential input
voltage
1000 VDC, or
1000 Vrms, or
1200V (DC + AC peak)
Output Characteristics
Output Characteristics
Output cable Safety designed BNC cable
Cable length 0.5 meter (20 inches)
Maximum output voltage range 6.5 V into 1 M
Environmental Specifications
Temperature Operating: 0 °C to +50 °C (+32 °F to +122 °F)
Altitude Operating: 3 km (9850 feet)
±Ω
Storage: -10 °C to +60 °C (+14 °F to +140 °F)
Storage: 12km (40,000 feet)
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N2772A Differential Voltage Probe
Characteristics and Specifications
Table 1
Susceptibility
(in % of full dynamic range)
Frequency range:
10 kHz to 25 MHz
20x <1% <1%
200x <1% <1%
Frequency range:
25 MHz to 1 GHz
20x <=1% <=2%
200x <=1% <=2%
Safety Specifications
Meets requirements of: EN61010-2-31 (IEC1010-2-31)
Compliant with: UL3111-1 (including listing)
Max floating output voltage 600V Category III, up to 400Hz. (From shielding to
E = 3 V/m E = 10 V/m
E = 3 V/m E = 10 V/m
CSA C222.2 No. 1010.1-92 (approval: pending)
ground.)
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WARNING SHOCK HAZARD!
These probes are designed for use with oscilloscopes that have a common
!
terminal at GROUND POTENTIAL (in accordance with OSHA requirements and
the National Electric Code). Exposed metallic surfaces of the probe and the
oscilloscope MUST BE GROUNDED. Failure to ground the common terminal
during certain applications, such as those requiring the oscilloscope to be
powered from an external battery, might expose the operator to an electrical
shock hazard that could be lethal (depending on voltage and current conditions.)
N2772A Differential Voltage Probe
Characteristics and Specifications
WARNING Do the following to avoid electrical shock or fire if the probe is connected to
more than 42V peak (30V rms):
• Use only the N2773A power adapter or a 9V battery.
• Connect the power adapter to the AC outlet before connecting it to the
N2772A.
• Do not insert metal objects in the power adapter connector.
• Use 600V rated test lead adapters. The maximum allowable input
voltage is 600V, Category III.
This symbol signifies that the N2772A Differential Probe is protected by
double or reinforced insulation. Only use specified replacement parts
when servicing the instrument.
This symbol signifies CAUTION! and requests that the user refer to the
user manual before using the instrument.
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