SAP2500D
Differential ProbeUser ManualEN01ACONTENTS

12SAFETY INSTRUCTIONS .................................................................................................................................... 21.1

SYMBOLS ............................................................................................................................................................ 31.2

OPERATING E NVIRONMENT ............................................................................................................................... 31.3

CALIBRATION ...................................................................................................................................................... 41.4

CLEANING ........................................................................................................................................................... 41.5

ABNORMALITIES ................................................................................................................................................. 4

FIRST STEPS.......................................................................................................................................................... 62.1

DELIVERY C HECKLIST ........................................................................................................................................ 62.2

FUNCTIONAL C HECK .......................................................................................................................................... 62.3

QUALITY ASSURANCE ........................................................................................................................................ 82.4

MAINTENANCE AGREEMENT .............................................................................................................................. 83

MECHANICAL DIMENSION ................................................................................................................................ 94

ACCESSORIES .................................................................................................................................................... 105PROBE OPERATION .......................................................................................................................................... 1465.1

CONNECTING THE PROBE TO AN OSCILLOSCOPE .......................................................................................... 145.2

CONNECTING THE PROBE TO THE TEST CIRCUIT .......................................................................................... 14

SPECIFICATIONS................................................................................................................................................ 16

SAP2500D Differential Probe User Manual1

1 Safety Instructions
Carefully read the following safety precautions to avoid personal injury andprevent damage to the instrument and any products connected to it. To avoid
potential hazards, please use the instrument as specified.

This section contains instructions that must be observed to keep thisoscilloscope accessory operating in a correct and safe condition. You arerequired to follow generally accepted safety procedures in addition to theprecautions specified in this section. The overall safety of any system
incorporating this accessory is the responsibility of the assembler of thesystem.
Connect and disconnect properly. Connect the probe to the measurement
instrument before connecting the test leads to a circuit/signal being tested.
Use only within the operational environment listed. Do not use in wet orexplosive atmospheres.
Ground the product. This product is indirectly grounded through thegrounding conductor of the mainframe power cord. To avoid electric shock, thegrounding conductor must be connected to the earth ground. Before making
connections to the input or output terminals of the product, ensure that theproduct is properly grounded.
Use indoors only.
Keep product surfaces clean and dry.
Be careful with sharp tips. The tips may cause bodily injury if not handledproperly.

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SAP2500D Differential Probe User ManualDo not operate with suspected failures. Do not use the probe if any part isdamaged. Cease operation immediately and sequester the probe frominadvertent use.

1.1 Symbols
These symbols may appear on the probe body or in this manual to alert you toimportant safety considerations.

CAUTION. Potential for damage to probe or instrument it isconnected to. Attend to the accompanying information to protect
against personal injury or damage. Do not proceed until conditions
are fully understood and met

1.2 Operating Environment
The accessory is intended for indoor use and should be operated in a clean,
dry environment. Before using this product, ensure that its operating
environment is maintained within these parameters:
Temperature： 5°C to 40°C.
Humidity：The maximum relative humidity is 80 % for temperatures up to30 °C decreasing linearly to 50 % relative humidity at 40°C.
Altitude：Up to 10,000 ft (3,048 m).

SAP2500D Differential Probe User Manual

3

WARNING: Do not operate this product in explosive, dusty or humidair.

CAUTION: Do not exceed the specified maximum input voltage.
See technical data for details.

1.3 Calibration
The recommended calibration interval is one year from the time the probe isput into service.

1.4 Cleaning
The exterior of the probe and cable should be cleaned, using a soft clothmoistened with water. The use of abrasive agents, strong detergents, or othersolvents may damage the probe. Always ensure that the input leads are free ofdebris.

CAUTION: The probe case is not sealed and should never be
immersed in any fluid.

1.5 Abnormalities
This probe should only be used for the purpose specified by the manufacturer.
The probe may be damaged when it exhibits visible damage or is subjected to4

SAP2500D Differential Probe User Manualsevere transportation pressure. If you suspect that the probe is damaged,immediately disconnect the probe from the oscilloscope. To use the probecorrectly, all instructions and markings should be read carefully.

WARNING: Using the probe in a manner not specified by themanufacturer may damage the probe. This probe and related
accessories should not be directly connected to the human body orused for patient monitoring.

SAP2500D Differential Probe User Manual5

2 First Steps

2.1 Delivery Checklist
First, verify that all items listed on the packing list have been delivered. If you
note any omissions or damage, please contact your nearest SIGLENTcustomer service center or distributor as soon as possible. If you fail to contact
us immediately in case of omission or damage, we will not be responsible forreplacement.

Figure 1 SAP2500D Differential Probe

2.2 Functional Check
The function check needs to use an oscilloscope that supports the SIGLENTSAPBus interface. This is currently the SIGLENT SDS5000X and SDS6000A
series of oscilloscopes. Please follow the steps below to check the probe

6SAP2500D Differential Probe User Manualfunction.
1. Turn on the oscilloscope and warm-up for 20 minutes.
2. Connect the active probe to channel 1 of the oscilloscope.
3. Open the parameter bar of channel 1 and check the probe information,
including probe model, serial number, bandwidth, impedance, capacitanceand attenuation ratio.
4. Select the channel to which the probe is connected. Set the oscilloscope
scale factor to 1 V/div. Set the oscilloscope offset factor to 0 V.
5. Measure the average voltage of channel 1, and the reading range should
be within ± (1.5%* full-screen reading +10 mV). If the reading is beyond
the range, the check will not pass.
6. Change the scale factor of channel 1 to 500 mV/div, 200 mV/div, 100mV/div, 50 mV/div, 20 mV/div, 10 mV/div, and repeat Step 5 to check theaverage voltage reading at each scale.

SAP2500D Differential Probe User Manual72.3 Quality Assurance
Probes and accessories have a 1-year warranty from the date of shipment,
during normal use and operation. SIGLENT can repair or replace any productthat is returned to the authorized service center during the warranty period. We
must first examine the product to make sure that the defect is caused by theprocess or material, not by abuse, negligence, accident, abnormal conditions,or operation.

SIGLENT shall not be responsible for any defect, damage, or failure caused byany of the following:a) Attempted repairs or installations by personnel other than SIGLENT.
b) Connection to incompatible devices/incorrect connection.
c) For any damage or malfunction caused using non-SIGLENT supplies.
Furthermore, SIGLENT shall not be obligated to service a product that has
been modified. Spare, replacement parts, and repairs have a 90-day
warranty.

2.4 Maintenance Agreement
We provide various services based on maintenance agreements. We offer
extended warranties as well as installation, training, enhancement and on-site
maintenance, and other services through specialized supplementary supportagreements. For details, please consult your local SIGLENT customer service
center or distributor.

8SAP2500D Differential Probe User Manual

3 Mechanical Dimension
Characteristic

Description

SAPBus interface
115.0 mm × 38.9 mm × 24.5 mmbox
Probe head

100.0 mm x 12.0 mm x 10.0 mm

Tip Pitch

2.54mmCable length

1.3 m (from the probe head to the compensation box)

SAP2500D Differential Probe User Manual

94 Accessories
The SAP2500D Differential probes are provided with numerous features andaccessories to make probing and connecting to different test points easier thanever.
Standard Accessory

Part Number

Quantity

Unit

Straight Tip

2.74.70.12.003

5pcs

Pogo Tip

2.74.70.12.004

5pcs

Swivel Tip

2.74.70.10.018

2

pcs

Tip Saver

2.74.70.10.019

2pcs

Y Lead Adapter

2.52.42.11.026

2pcs

Right Angle Pin Lead 5 cm

2.52.42.11.016

1pcs

Straight Pin Lead 6 cm

2.52.42.11.017

1pcs

Straight Pin Lead 12 cm

2.52.42.11.019

1pcs

Spring-loaded Ground (Short)

2.52.42.11.025

2pcs

Spring-loaded Ground (Long)

2.52.42.11.028

2

pcs

Solder-in Lead

2.52.42.11.027

2

pcs

Channel ID Clips(Set of 4 colors)

2.75.23.10.003

1

set

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SAP2500D Differential Probe User ManualFigure 2 Accessories

Straight Tip (Part Number 2.74.70.12.003)：The straight tip is rugged anddesigned for general probing. Fits in either probe socket.

Pogo Tip (Part Number 2.74.70.12.004)：The pogo tip provides z axis
compliance. The tip can fit into a socket or via and onto an IC leg.

Swivel Tip (Part Number 2.74.70.10.018)：The swivel tip adapter features
adjustable tip spacing to reach test points. A 20 Ω damping resistor is included
to reduce inductive peaking.

Tip Saver (Part Number 2.74.70.10.019)：To prevent wear out on the probe

SAP2500D Differential Probe User Manual11input leads.

Y Lead Adapter (Part Number 2.52.42.11.026)：This lead is used for both
ground and input lead simultaneously. It has two sockets on one end and twosquare pins on the other and may be used for general purpose probing.

Straight Pin Leads (Part Number 6 cm 2.52.42.11.017 / 12 cm
2.52.42.11.019)：These leads have a socket on one end and a square pin on
the other to connect to the input or ground socket of the probe body, and may
be used for general purpose probing.

Right Angle Pin Leads (Part Number 2.52.42.11.016): These leads have asocket on one end with a right angle and a square pin on the other to connect
to the input or ground socket of the probe body, and may be used for general
purpose probing.

Spring-loaded Ground (Part Number Short 2.52.42.11.025 / Long12SAP2500D Differential Probe User Manual

2.52.42.11.028): Spring-loaded ground leads are bendable. They are designed
to be attached to the offset ground socket or be attached to either socket of theprobe head.

Solder-in Lead (Part Number 2.52.42.11.027)：This lead is designed to besoldered directly to the test points for a secure connection. A damping 56.2 Ω
resistor is included to reduce inductive peaking.

Channel ID Clips (Part Number 2.75.23.10.003)：They are used to distinguishthe oscilloscope channel that the probe is connected to.

SAP2500D Differential Probe User Manual13

5 Probe Operation
The SAP series probe is a precision test instrument accessory. Exercise carewhen handling and storing the probe. Always handle the probe by the probe
body or compensation box. Avoid putting excessive strain or exposing theprobe cable to sharp bends.

ESD Sensitive: The tips of the probes are sensitive to Electrostatic
Discharge (ESD). Avoid causing damage to the probe by always following
anti-static procedures (wear wrist strap, etc.) when using or handling theprobe.

5.1 Connecting the Probe to an Oscilloscope
The SAP2500D differential probes have been designed for use with Siglent’s
SDS5000X and SDS6000A platforms equipped with the SAPBus interface.
When you attach the probe output connector to the oscilloscope’s input
connector, the oscilloscope recognizes the probe and provides proper
termination.

5.2 Connecting the Probe to the Test Circuit
To maintain the high-performance capability of the probe in measurement
applications, care must be exercised in connecting the probe to the test circuit.

14SAP2500D Differential Probe User ManualIncreasing the parasitic capacitance or inductance in the input paths may
introduce a “ring” or slow the rise time of fast signals. Input leads that form alarge loop area will pick up any radiated electromagnetic field which passes
through the loop and may induce noise into the probe input.

Using one of the available accessories makes the SAP2500D probe with its
small profile and low mass head ideally suited for applications in dense
circuitry.

The amplifier inside the probe has a limited linear working range. To ensurethat the input linearity error is less than 3%, the amplitude of the input signal
needs to be limited to ± 4 V. The probe has a DC offset adjustment function,
which can adjust the DC offset to eliminate the DC component in the test signal
and maximize the performance of the probe. The DC offset adjustment range
is ± 8 V.

SAP2500D Differential Probe User Manual15

6 Specifications
The SAP2500D is a compact, high impedance differential probe designed tomeet today’s increasing demand for measurements on a variety of test points.
With low input capacitance and high input resistance, circuit loading isminimized.

With the SAPBus interface, the SAP2500D becomes an integral part of theoscilloscope measurement circuit. The probe can be controlled from theoscilloscope’s front panel. The oscilloscope provides power to the probe, so
there is no need for a separate power supply or batteries.

Key BenefitsBandwidth
DC ~ >2.5 GHz

100 kΩ Single-ended Input Resistance

200 kΩ Differential Input Resistance10X Attenuation



1 pF Differential Input Capacitance±4 Volts Dynamic Range with ±8 Volts offset capability

SAPBus interface

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SAP2500D Differential Probe User Manual

The specifications of the probe need to meet the following conditions:
1. The probe is within the validity period of calibration.
2. The ambient temperature is within 25℃±5℃.
3. The probe is correctly connected to the oscilloscope.
4. The probe and oscilloscope are in a thermally stable environment, and theprobe and oscilloscope should be warmed up for at least 20 minutes.

Warranted characteristics:
Characteristics

SAP2500D

Bandwidth (probe only)> 2.5 GHz

Bandwidth (with scope)

2 GHz (SDS6204A)

Differential Input capacitance

1 pFDifferential Input resistance

200 kΩ

Single-ended Input resistance

100 kΩ

Offset range±8 VAttenuation ratio (DC)÷10Offset accuracy< 3%DC gain accuracy< 3%Input dynamic range±4 V

Maximum input voltage(non-destructive)

20 VCable length

130 cm

SAP2500D Differential Probe User Manual17Figure 3 Typical system frequency response of the SAP2500D and an SDS6204A

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SAP2500D Differential Probe User ManualSAP2500D Differential Probe User Manual

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