The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
Tektronix products are covered by U.S. and foreign patents, issued and
pending. Information in this publication supercedes that in all previously
published material. Specifications and price cha nge privileges reserved.
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX, TEK, SureFoot, and TekConnect are registered trademarks of
Tektronix, Inc., and KlipChip is a trademark of Tektronix, Inc.
WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects
in materials and workmanship for a period of one (1) year from the date of shipment. If a
product proves defective during this warranty period, Tektronix, at its option, either will
repair the defective product without charge for parts and labor, or will provide a
replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the
defect before the expiration of the warranty period and make suitable arrangements for the
performance of service. Customer shall be responsible for packaging and shipping the
defective product to the service center designated by Tektronix, with shipping charges
prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to
a location within the country in which the Tektronix service center is located. Customer
shall be responsible for paying all shipping charges, duties, taxes, and any other charges for
products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or
improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish
service under this warranty a) to repair damage resulting from attempts by personnel other
than Tektronix representatives to install, repair or service the product; b) to repair damage
resulting from improper use or connection to incompatible equipment; c) to repair any
damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a
product that has been modified or integrated with other products when the effect of such
modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER
WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS
DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY
TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF
THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE
FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR
HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Preface
This is the Instruction Manual for the P7350 differential probe.
This manual provides operating information, specifications, and a
replaceable parts list.
P7350 5 GHz Differential Probe Instruction Manual
i
Preface
Contacting Tektronix
Phone1-800-833-9200*
AddressTektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
Web sitewww.tektronix.com
Sales
support
Service
support
Technical
support
*This phone number is toll free in North America. After office
hours, please l eave a voice mail message.
Outside North America, contact a Tektronix sales office or
distributor; see the Tektronix web site for a list of offices.
Review the following safety precautions to avoid injury and prevent
damage to this product or any products connected to it. To avoid
potential hazards, use this product only as specified.
To Avoid Fire or Personal Injury
Connect and Disconnect Properly. Connect the probe output to the
measurement instrument before connecting the probe to the circuit
under test. Disconnect the probe input and the probe ground from the
circuit under test before disconnecting the probe from the measurement instrument.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all
ratings and markings on the product. Consult the product manual for
further ratings information be fore making connections to the product.
The common terminal is at ground potential. Do not connect the
common terminal to elevated voltages.
Do Not Operate Without Covers. Do not operate this product with
covers or panels removed.
Do Not Operate With Suspected Failures. If you suspect there is damage
to this product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
P7350 5 GHz Differential Probe Instruction Manual
v
General Safety Summary
Safety Terms and Symbols
Terms in This Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that
could result in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that
could result in damage to this product or other property.
Terms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you
read the marking.
WARNING indicates an injury hazard not immediately accessible as
you read the marking.
CAUTION indicates a ha zard to property including the product.
Symbols on the Product. These symbols may appear on the product:
CAUTION
Refer to Manual
vi
P7350 5 GHz Differential Probe Instruction Manual
Service Safety Summary
Only qualified personnel should perform service procedures. Re ad
this Service Safety Summary and the General Safety Summary before
performing any service procedures.
Do Not Service Alone. Do not perform internal service or adjustments
of this product unless another person capabl e of rendering fi rst aid
and resuscitation is present.
P7350 5 GHz Differential Probe Instruction Manual
vii
Service Safety Summary
viii
P7350 5 GHz Differential Probe Instruction Manual
Getting Started
The P7350 is a high-bandwidth (5 GHz typical), active differential
probe with a miniaturized probe head design. The probe has low
circuit loading, high common-mode rejection, and ships with a
variety of accessories for connecting to surface-m ount device s and
other components.
Figure 1: P7350 differential probe featuring the TekConnect interface
TekConnect Interface
The P7350 probe is powered through a TekConnect interface
between the probe compensation box and the host instrument. The
TekConnect interface provides a communication path through
contact pins on the host instrument. Power, signal, offset, and probe
characteristic data transfer through the interface.
P7350 5 GHz Differential Probe Instruction Manual
1
Getting Started
When the probe is connected, the host instrument reads EEPROM
information from the probe, identifying the device and allowing the
appropriate power supplies to be turned on. The preamp inputs on the
host instrument are ESD protected by remaining grounde d until a
valid TekConnect device is detected.
The TekConnect interface features a spring-loaded latch that
provides audible and tactile confirmation that a reliable connection
has been made to the host instrument. Slide the probe into the
TekConnect receptacle on the host instrument. The probe snaps into
the receptacle when fully engaged. See Figure 2.
To release the probe from the host instrument, grasp the compensation box, press the latch button, and pull out the probe.
Latch button
Figure 2: Connecting and disconnecting the probe
2
P7350 5 GHz Differential Probe Instruction Manual
Functional Check
After installing the probe on the oscilloscope, a functional check
may be performed using the PROBE COMPENSATION connections
on the front panel of the oscilloscope. Figure 3 shows a method for
connecting the probe to a typical compensation connector.
Getting Started
Figure 3: Probe functional check connections
1. Connect the probe to the oscilloscope.
2. Set the oscilloscope to display the probe channel.
3. Connect the square pin adapter to the probe tip, and connect the
Y-lead adapter to the square pin adapter. Plug the SMT KlipChips
into the Y-lead adapter.
4. Connect the SMT KlipChips to the PROBE COMPENSATION
connections on the oscilloscope.
5. Adjust the oscilloscope to display a stable calibration waveform.
P7350 5 GHz Differential Probe Instruction Manual
3
Getting Started
NOTE. If your instrument supports probe calibration routines, now is
a good time to perform them.
6. Disconnect the probe from the PROBE COMPENSATION
connector, and connect the two KlipChips together.
7. With the probe offset set to 0.0 V, the oscilloscope display should
be at the ground reference.
8. Set the oscilloscope volts/division to 500 mV.
9. Adjust the probe offset. The displayed waveform should vary
between approximately +1.25 V and --1.25 V.
Options
The following options are available when ordering the P7350 probe:
HOption D1--Calibration Data Report
HOption D3--Calibration Data Report, 3 years (with Option C3)
HOption C3--Calibration Service 3 years
HOption D5--Calibration Data Report, 5 years (with Option C5)
HOption C5--Calibration Service 5 years
HOption R3--Repair Service 3 years
HOption R5--Repair Service 5 years
4
P7350 5 GHz Differential Probe Instruction Manual
Features and Standard Accessories
Table 1 shows the features and standard accessories of the P7350
differential probe.
Table 1: P7350 features and standard accessories
Feature/AccessoryDescription
TekConnect interface. The TekConnect interface provides a
communication path between the probe and the oscilloscope.
Contact pins provide power, signal, offset, and probe characteristic data transfer.
The probe snaps into the oscilloscope when fully engaged. To
remove, grasp the compensation box, press the latch button, and
pull the probe out.
Getting Started
Input connections. The plus and minus connections on the
probe tip accept the standard and optional probe accessories.
+
--
Ground
(Some of the accessories connect to the probe tip through the
square pin adapter.) The ground lead connects to the probe head
through a slot in the side of the insulated probe housing.
WARNING: Skin penetration hazard. To prevent injury, install the
probe tip cover when the probe is not in use. The probe tips are
extremely sharp to ensure good contact and measurement
integrity.
Probe tip cover. The probe tip cover is shipped on the probe.
The probe tips are extremely sharp to ensure good contact and
measurement integrity. When not using the probe, slide the probe
tip cover over the probe head to prevent damage to the probe tips
and to protect yourself from personal injury.
Tektronix part number: 200-4236-XX
Three-inch ground lead (2 ea). Use the ground lead for
connecting the probe ground to the circuit, if needed. The
socketed end of the lead may be connected to accessories, or
fitted onto 0.025-inch square pins.
Tektronix part number: 196-3469-XX (package of 2)
P7350 5 GHz Differential Probe Instruction Manual
5
Getting Started
Table 1: P7350 features and standard accessories (Cont.)
Feature/AccessoryDescription
Variable spacing adapter (4 ea). The variable spacing adapter
fits over the probe tip. Push the adapter onto the probe tip until it
seats against the probe head.
Use the variable spacing adapter to probe any two adjacent leads
or test points spaced between 0.020 and 0.180-inches apart. See
Figure 16 on page 28 for physical dimensions of the adapter.
Adjust the articulated pins by gently rotating them using a pair of
tweezers.
NOTE: The articulated pins can be bent, but they are fragile. Use
extreme care when bending the pins.
The elastomeric contacts inside the adapter are rated for 50--75
Seated
against
probe head
insertion cycles with the probe tip. Replace the adapter after
exceeding these limits to avoid unreliable operation.
Seated
against
probe head
Tektronix part number: 016-1885-XX (package of 4)
Square pin adapter (4 ea). Push the square pin adapter onto the
probe tip until it seats against the probe head. Use the square pin
adapter to connect the probe to other accessories, such as the
Y-lead adapter or TwinFoot adapter. The inputs on the adapter
are spaced 0.100 inches apart. See Figure 17 on page 28 for
physical dimensions of the adapter.
CAUTION: To avoid damaging the square pin connectors, do not
insert anything larger than a 0.025-inch square pin into the inputs.
The elastomeric contacts inside the adapter are rated for 50--75
insertion cycles with the probe tip. Replace the adapter after
exceeding these limits to avoid unreliable operation.
Tektronix part number: 016-1884-XX (package of 4)
6
P7350 5 GHz Differential Probe Instruction Manual
Table 1: P7350 features and standard accessories (Cont.)
Feature/AccessoryDescription
TwinFoot adapter (4 ea). Use the TwinFoot adapter to probe two
adjacent leads on a surface-mount integrated circuit. The
TwinFoot adapter connects to the probe through the square pin
adapter. Flexible fingers adapt to a range of lead spacings. See
Figure 6 on page 13.
Tektronix part number: 016-1785-XX (package of 4)
Y-lead adapter (2 ea). The Y-lead adapter connects to the probe
through the square pin adapter. The socketed ends of the leads
may be connected to the probe tips and accessories, or fitted onto
0.025-inch square pins.
Getting Started
Tektronix part number: 196-3468-XX (package of 2)
Antistatic wrist strap. When using the probe, always work at an
antistatic work station and wear the antistatic wrist strap.
Tektronix part number: 006-3415-XX
X-lead adapter (2 ea). The X-lead adapter connects between
accessories fitted with 0.025-inch pins, such as the SMT KlipChip
and Micro KlipChip adapters.
You can use the X-lead adapter with the adapters below to make
connections between the probe tip and your circuit under test.
Be aware of the electrical effects of the added lead length of the
adapters, especially as circuit frequencies increase.
Tektronix part number: 196-3473-XX (package of 2)
SMT KlipChip adapter (2 ea). Use this accessory to probe the
leads on dual-in-line packages (DIP).
Tektronix part number: 206-0364-XX
P7350 5 GHz Differential Probe Instruction Manual
7
Getting Started
Table 1: P7350 features and standard accessories (Cont.)
Feature/AccessoryDescription
Cable marker bands
Cable marker bands (10 ea). Attach matching pairs of the
marker bands onto the cable at the head and compensation box
of each probe. The marker bands enable quick verification of
which probe is connected to which instrument channel.
Tektronix part number: 016-1886-XX (package of 10)
Plastic accessory box. Use the plastic box to store the probe
accessories when not in use.
Tektronix part number: 006-7164-XX
Instrument case. The instrument case protects the probe from
harsh environments and provides room for storing optional
accessories.
Tektronix part number: 016-1879-XX
Calibration certificate. A certificate of traceable calibration is
provided with every instrument shipped.
Accessory reorder sheet.
Use the accessory reorder sheet as a quick guide for ordering
accessories for your probe. The sheet provides photos and part
numbers for identifying your accessories.
Tektronix part number: 001-1362-XX
Instruction Manual. Provides instructions for operating and
maintaining the P7350 differential probe
Tektronix part number: 071-1238-XX
8
P7350 5 GHz Differential Probe Instruction Manual
Optional Accessories
Table 2 shows the optional accessories that you can order for the
P7350 differential probe.
Table 2: Optional accessories
AccessoryDescription
Micro KlipChip adapters. Use the adapters to probe the leads
on integrated circuits that are surface-mounted.
Tektronix part number: SMK4 (package of 4)
IEEE1394 Adapter. The IEEE1394 Adapter allows you to probe
signals on the bus, external to system enclosures, without
disturbing system operation. The adapter maintains a balanced
55 Ω signal path and can be used in both single-ended and
differential modes.
Getting Started
Tektronix part number: 679-5027-XX
TekConnect interface calibration adapter. The calibration
adapter is required when a performance verification or adjustment
is done on the probe. It provides connectors and test points for
internal probe measurements.
Tektronix part number: 067-0422-XX
Probe calibration fixture. Use the probe calibration fixture to
perform some of the calibration procedures. The calibration fixture
connects to signal sources used to test the probe characteristics.
Tektronix part number: 067-0419-XX
P7350 5 GHz Differential Probe Instruction Manual
9
Getting Started
10
P7350 5 GHz Differential Probe Instruction Manual
Operating Basics
This section discusses operating considerations and probing
techniques. For more detailed information about differential
measurements and common-mode rejection ratio (CMRR), see the
Reference sectiononpage17.
The P7350 probe design is optimized for high bandwidth, low
capacitance applications; it is not a general purpose probe. The probe
head and tips are miniaturized for electrical characteristics and
access to dense circuitry, and must be handled carefully. Rough or
careless use will likely damage the probe.
To avoid damaging the probe tips, minimize your lateral pressure on
the tips. Always probe as straight onto the circuit (perpendicular) as
possible. The probe tips are extremely sharp to ensure good contact
and measurement integrity.
WARNING. The sharp probe tips pose a skin penetration hazard. Use
care when handling the probe. To prevent injury and/or probe
damage, install the protective cover over the probe tips when the
probe is not in use (see Figure 4).
Figure 4: Protect the probe tips with the protective cover
P7350 5 GHz Differential Probe Instruction Manual
11
Operating Basics
Input Voltage Limits
The P7350 differential probe is designed to probe low-voltage
circuits. Before probing a voltage, take into account the limits for
maximum input voltage, the common-mode signal range, and the
differential-mode signal range. For specific limits, see Specifications
on page 21.
Maximum Input Voltage
The maximum input voltage is the maximum voltage to ground that
the inputs can withstand without damaging the probe input circuitry.
CAUTION. To avoid damaging the inputs of the P7350 differential
probe, do not apply more than ±15 V (DC + peak AC) between each
input and ground.
Common-Mode Signal Range
The common-mode signal range is the maximum voltage that you
can apply to each input, with respect to earth ground, without
saturating the input circuitry of the probe. A common-mode voltage
that exceeds the common-mode signal range may produce an
erroneous output waveform even when the differential-m ode
specification is met. For Specifications, refer to page 21.
Differential-Mode Signal Range
The differential-mode signal range is the maximum voltage
difference between the plus and minus inputs that the probe can
accept without distorting the signal. The distortion from a volta ge
that is too large can result in a clipped or otherwise distorted and
inaccurate measurement. For Specifications, refer to page 21.
Common-Mode Rejection
The common-mode rejection ratio (CMRR) is the ability of a probe
to reject signals that are common to both inputs. More prec isely,
CMRR is the ratio of the differential gain to the common-mode gain.
The higher the ratio, the greater the ability to reject common-mode
signals. For additional information about CMRR, see page 18.
12
P7350 5 GHz Differential Probe Instruction Manual
Probing Techniques to Maximize CMRR
The common-mode rejection of the probe is highest when the probe
is applied directly to the circuit, without using adapters. However,
some probing tasks are made easier using accessories incl uded with
the probe. The accessories shown in Figures 5 and 6 achieve a high
CMRR by minimizing the distance between the probe head and the
signal source.
Operating Basics
Figure 5: Using the variable spacing adapter
TwinFoot adapter
Square pin adapter
Conductive side
Probe
of probe tip
Insulated side of probe tip
Figure 6: Using the TwinFoot adapter
IC leads being probed
P7350 5 GHz Differential Probe Instruction Manual
13
Operating Basics
Input Impedance and Probe Loading
When you connect the probe inputs to a circui t, you are introducing a
new resistance, capacitance, and inductance into the circuit. Each
input of the P7350 differential probe has a characteristic input
impedance of 50 kΩ to ground in parallel with le ss tha n 0.4 pF. See
Figure 7.
For signals with low source impedance and frequency, the 50 kΩ
input impedance on each input is large enough to prevent the inputs
from loading the signal sources. The greater the source impedances
and the higher the signal frequencies, the more you must take these
factors into account.
Input
+
130 Ω
0.4pF50kΩ
Ground
--
0.1 pF0.4 pF
Input
130 Ω
50 kΩ
Figure 7: Typical probe input model
As the impedance of the signal source on an input increases, the
more the probe loads the source and reduces the signal amplitude.
The frequency of the signal also affects signal measurement. As the
frequency of the signal increases, the input impedance of the probe
decreases. The lower the impedance of the probe relative to that of
the source, the more the probe loads the circuit under test and
reduces the signal amplitude. For a graph of frequency versus input
impedance, refer to Figure 13 on page 25.
14
P7350 5 GHz Differential Probe Instruction Manual
Probe Grounding
In addition to the plus and minus inputs on the probe head, there is
also a ground (common) input. The ground lead slides into the notch
on the side of the probe. See Figure 8.
+
Operating Basics
--
Ground
Figure 8: Probe ground input
CAUTION. To avoid damaging the circuitry under test, connect the
probe ground (common), if used, to a ground-reference point only.
In most applications, the common-mode impedance to ground is
greater than the differential impe dance. Adding the probe ground
lead does not improve the high-frequency performa nce of the
measurement. You can use the probe to t ake a differential measurement regardless of whether or not the ground (common) is connected.
There are some applications that may require a ground reference
connection to maintain measurement accuracy. Generally this is
necessary when probing circuits which are fully isolated from
ground, such as battery operated devices.
P7350 5 GHz Differential Probe Instruction Manual
15
Operating Basics
Electrical Effects of Accessories
The probe tip accessories included with your probe help connect to
different types of components. While these accessories make
connections easier, be aware tha t the adapter you choose may affect
the signal you are measuring, depending on a variety of factors,
including signal frequency, source impedance, and lead length.
Use the probe only (without adapters) to optimize step and frequency
response. Using the probe tip adapters adds inductance and
capacitance, which increases step response and aberrations, and leads
to increased ripples in frequency response. These effects increase as
the source impedance and the measured waveform risetimes
decrease. Refer to page 23 for input capacitance specifications when
using the variable spacing and square pin adapters.
The recommended method for hands-free probing is to use the probe
only (without adapters), with a probe positioner such as a Tektronix
PPM100 or PPM203B. If you need a tip space between 0.020 and
0.180 inches apart, use the variable spacing adapter and the probe
positioner. Use the square pin adapter for test points or component
leads spaced farther than 0.180 inches apart.
Figure 9 illustrates the typical effects on a given signal using some of
the adapters included with your probe.
Probe only
Variable
spacing
adapter
Square pin
adapter
16
Figure 9: Typical effects on a signal using probe tip adapters
P7350 5 GHz Differential Probe Instruction Manual
Reference
This section contains important referenc e information about
differential measurements and how to increase the accuracy of your
measurements.
Problems with Single-Ended Measurements
While suitable in many applications, single-ended measurements can
present problems in the following situations:
HWhen the signal is not referenced to eart h ground
HWhen the signal being measured is distorted or changed by
connecting or disconnecting the probe ground reference lead
Differential Measurements
Devices designed to make differential mea surements avoid the
problems posed by single-ended systems. These devices include a
variety of differential probes, differential amplifiers, and isolators.
The differential amplifier (Figure 10 on page 18) is at the heart of
any device or system designed to make differential measurements.
Ideally, the differential amplifier rejects any voltage that is common
to the inputs and amplifies any difference between the inputs.
Voltage that is common to both inputs is often re ferred to as the
Common-Mode Voltage (V
Differential-Mode Voltage (V
) and voltage that is different as the
CM
).
DM
P7350 5 GHz Differential Probe Instruction Manual
17
Reference
+
Differential
mode
Common
mode
+
V
DM
+
V
CM
--
Figure 10: Simplified model of a differential amplifier
V
out
Common-Mode Rejection Ratio
In reality, differential amplifiers cannot reject all of the commonmode signal. The ability of a differential amplifier to reject the
common-mode signal is expressed as the Common-Mode Rejection
Ratio (CMRR). The CMRR is the differential-mode gain (A
divided by the common-mode gain (A
). It is expressed either as a
CM
DM
)
ratio or in dB.
A
DM
A
CM
CMRR =
A
DM
dB = 20 log
A
CM
CMRR generally is highest (best) at DC and degrades with
increasing frequency.
Assessing CMRR Error
Figure 12 on page 24 shows the CMRR of the P7350 differential
probe. This derating chart assumes a common-mode signal that is
sinusoidal.
18
P7350 5 GHz Differential Probe Instruction Manual
Reference
A quick way to assess the magnitude of CMRR error when the
common-mode signal is not sinusoidal is to connect both leads to the
same point in the circuit. The oscilloscope will display only the
common-mode component which is not fully rejected by the probe.
While this technique may not give you entirely accurate measurements, it does allow you to determine if the magnitude of the
common-mode error signal is significant.
Input Impedance Effects on CMRR
The lower the input impedance of the probe relative to the source
impedance,thelowertheCMRR.SeeFigure12onpage24.
Significant differences in the source impedance driving the two
inputs will also lower the CMRR.
Extending the Input Leads
At times it may be necessary to extend the probe inputs with wires or
a probe tip adapter. When you do this, you should minimize the lead
lengths to optimize common-mode rejection and twist the input leads
together as shown in Figure 11 on page 20.
Twisting the input leads together does increase capacitance that may
degrade high-frequency performance. You should take into account
any effects caused by the extended leads when you take a measurement.
P7350 5 GHz Differential Probe Instruction Manual
19
Reference
Square pin adapter
Figure 11: Twisting the input l eads
Extending the Ground Lead
Extending the ground lead will have little, if any, affect on your
measurements. In most circuits, the ground path from the differential
source has sufficiently high impedance to damp out any ringing
caused by lead inductance.
20
P7350 5 GHz Differential Probe Instruction Manual
Appendix A: Specifications
The specifications in Tables 3 through 5 apply to a P7350 probe
installed on a TDS6604 oscilloscope. The probe must have a
warm-up period of at least 20 minutes and be in an environment that
does not exceed the limits described in Table 3. Specifications for the
P7350 differential probe fall into three categories: warrant ed, typical,
and nominal characteristics.
Warranted Characteristics
Warranted characteristics (Table 3) describe guaranteed performance
within tolerance limits or certain type-tested requirements.
Warranted characteristics that have checks in the PerformanceVerification section are marked with the n symbol.
Table 3: Warranted electrical characteristics
Characteristic
n Rise time (probe only)100 ps, +20 _Cto+30_C(+68_Fto+86_F),
n DC gain
n Output offset voltage±10 mV +20 _Cto+30_C(+68_Fto+86_F)
Maximum nondestructive input voltage±15 V(DC + peak AC) between signal and
Delay variation (probe-to-probe)600 ps maximum
Temperature
Description
250 mV step
0.16 ±2% (corresponds to 6.25 X attenuation)
common of the same channel.
Operating: 0 to +40 _C (+32 to +104 _ F)
Nonoperating: --55 to +75 _C (--131 to +167 _F)
Nonoperating: 0--90% RH, tested at
+30to+60_C(+68to+140_F)
WARNING. To avoid a burn hazard at high ambient temperatures, do
not touch the probe with bare hands at nonoperating temperatures
above + 70 _C. Allow sufficient time for the probe to cool before
handling
.
T ypical Characteristics
Typical characteristics (Tables 4 and 6) describe typical but not
guaranteed performance.
DC Voltage Measurement Accuracy
(referred to input)
Figure 12 shows the typical common-mode and differenti al gain of
the probe. The CMRR can be found by subtracting the commonmode gain from the differential gain. For example, --80 dB CM gain
equals approximately +64 dB CMRR.
0dB
-- 1 0
±[(2% of input relative to offset) + (2% of offset) +
62.5 mV + 50.0 mV]
gain error = ±2% of input voltage relative to offset
offset gain error =±2% of effective offset at probe
tip
output zero = ±62.5 mV effective at probe tip
linearity error = ±1.0% of 5.0 V dynamic range
(50.0 mV)
-- 2 0
-- 3 0
-- 4 0
-- 5 0
-- 6 0
-- 7 0
-- 8 0
-- 9 0
100 kHz
CMRR
1 MHz100 MHz
Differential Mode Gain
Common Mode Gain
10 MHz
Frequency
Figure 12: Typical common- and differential-mode gain plots
24
P7350 5 GHz Differential Probe Instruction Manual
1GHz
6GHz
The graph in Figure 13 represents simulation results of a first order
model of the probe input.
Impedance (Ω)
100 k
10 k
1k
100
10
1M
10 M
100 M
Frequency (Hz)
Appendix A: Specifications
1G
10 G
Figure 13: Typical differential input impedance vs frequency
-- 1 0
-- 1 2
-- 1 4
-- 1 6
-- 1 8
-- 2 0
Gain dB
-- 2 2
-- 2 4
-- 2 6
-- 2 8
Gain = 20 Log
10 MHz1MHz100MHz10GHz
Ꮛ
V
OUT
V
Ꮠ
IN
1GHz
Frequency
Figure 14: Typical bandwidth
P7350 5 GHz Differential Probe Instruction Manual
25
Appendix A: Specifications
Nominal Characteristics
Nominal characteristics (Table 5) describe guaranteed traits, but the
traits do not have tolerance limits.
Table 5: Nominal electrical characteristics
Input configurationDifferential (two inputs, + and -- ), with case
ground
Attenuation6.25 X
Input couplingDC
Termination
1
All TekConnect host instruments recognize this gain setting and adjust the
1
Terminate output into 50 Ω
Volts/Div setting to correspond to a normal 1- 2- 5 sequence of gains.
26
P7350 5 GHz Differential Probe Instruction Manual
Appendix A: Specifications
Table 6: Typical mechanical characteristics
Dimensions, control box91.5 mm × 43.8 mm × 31.8 mm
(3.60 in × 1.725 in × 1.25 in)
Dimensions, probe head59 mm × 7.7 mm × 5.1 mm
(2.30 in × 0.30 in × 0.20 in)
Dimensions, output cable1.2m(47in)
Unit weight (probe only)223g(7.5oz)
7.6 mm
(0.300 in)
5.08 mm
(0.200 in)
63.5 mm
(2.55 in)
2.286 mm
(0.090 in)
2.54 mm
(0.100 in)
31.8 mm
(1.250 in)
63.5 mm
(2.500 in)
91.5 mm
(3.600 in)
Figure 15: Probe head and compensation box dimensions
43.8 mm
(1.725 in)
P7350 5 GHz Differential Probe Instruction Manual
27
Appendix A: Specifications
4.57 mm
(0.180 in)
9.40 mm
(0.370 in)
0.51 mm
(0.020 in)
5.80 mm
(0.228 in)
Figure 16: Variable spacing adapter dimensions
6.60 mm
(0.260 in)
10.50 mm
(0.412 in)
3.60 mm
(0.140 in)
2.90 mm
(0.114 in)
14.73 mm
(0.580 in)
9.40 mm
(0.370 in)
4.57 mm
(0.180 in)
5.80 mm
(0.228 in)
8.15 mm
(0.321 in)
4.45 mm
(0.175 in)
Figure 17: Square pin adapter dimensions
11.20 mm
(0.442 in)
6.60 mm
(0.260 in)
14.73 mm
(0.615 in)
2.13 mm
(0.084 in)
2.80 mm
(0.110 in)
4.62 mm
(0.182 in)
28
P7350 5 GHz Differential Probe Instruction Manual
Appendix B: Performance Verification
Use the following procedures to verify specifications of the probe.
Before beginning these procedures, refer to page 42 and photocopy
the test record, and use it to record the pe rformance test results. The
recommended calibration interval is one year.
These procedures test the following specifications:
HOutput offset voltage
HDC gain accuracy
HRise time
Equipment Required
Refer to Table 7 for a list of the equipment required to verify the
performance of your probe.
Table 7: Equipment required for performance verification
Item descriptionPerformance requirementRecommended example
DMM (2), with leads0.1 mV resolutionFluke 87 or equivalent
Feedthrough Termination
Coaxial cableMale-to-Male SMA012-0649-00
20 GHz bandwidthTektronix 80E04 with
012-1568-00 cable
BNC, 50 Ω ±0.05 Ω
011-0129-00
1
P7350 5 GHz Differential Probe Instruction Manual
29
Appendix B: Performance Verification
Table 7: Equipment required for performance verification (Cont.)
Item descriptionRecommended example
Coaxial cable
Performance requirement
Male-to-Male BNC, 50 Ω
012-0057-01
Test leads (3)Banana plug ends, red012-0031-00
Test leads (3)Banana plug ends, black012-0039-00
Probe Calibration FixtureSee page 33067-0419-00
TekConnect Interface
See page 31067-0422-00
Calibration Adapter
AdapterTekConnect-to-SMATCA-SMA
AdapterSMA Male-to-Male015-1011-00
AdapterSMA Male-to-BNC Female015-1018-00
AdapterBNC Female-to-Dual
103-0090-00
Banana
AdapterSquare pin adapter016-1884-00
AdapterY-lead adapter196-3468-00
Adapters (2)KlipChip adapter206-0364-00
1
SMA torque wrench5/16-inch, 7 in-lb.
1
Nine-digit part numbers (XXX-XXXX-XX) are Tektronix part numbers.
30
P7350 5 GHz Differential Probe Instruction Manual
Appendix B: Performance Verification
TekConnect Interface Calibration Adapter
To complete the performance verification and adjustment procedures
for your probe, you need to order the optional TekConnect Interface
Calibration Adapter, Tektronix part number 067-0422-00 (see
Figure 18). The adapter connects between the host instrument and
the probe under test and provides connectors for internal probe
measurements.
When the adapter is connected to the oscilloscope, the adapter is
identified as a valid calibration device. However, additional power
supplies necessary to power the probe are not enabled until a
TekConnect probe is connected to the adapter and identified by the
oscilloscope. When a probe is detected through the adapter, the
Volts/div readout on the oscilloscope displays ##.
Refer to Table 8 on page 32 for detailed features of the calibration
adapter.
P7350 5 GHz Differential Probe Instruction Manual
31
Appendix B: Performance Verification
Table 8: TekConnect Interface Calibration Adapter features
FeatureDescription
GND
VAR
Latch button
Latch
Offset
GND/Variable
Offset voltage
output
Signal out
Latch button. The spring-loaded latch
mechanically retains the adapter to the oscilloscope. To release the adapter, grasp the adapter
housing, depress the latch button, and pull the
adapter straight out of the oscilloscope.
Offset output select switch. The offset output
switch selects between ground and the offset
voltage level from the oscilloscope.
Leave the switch in the ground position for the
performance verification procedures. The variable
position is only used in the adjustment procedures.
Offset voltage. The offset voltage of the probe
is accessed through the BNC connector.
Measure the offset voltage using a DVM, BNC
coaxial cable and BNC-to-dual-banana jack.
Signal out. The SMA connector on the rear of
the box allows for direct monitoring of the probe
signal.
32
P7350 5 GHz Differential Probe Instruction Manual
Probe Calibration Fixture
Some of the procedures in this manual use a probe calibration
fixture, Tektronix part number 067-0419-00.
The calibration fixture provides a me ans to test the probe for both
common mode and differential mode measurements. SMA
connectors allow stimulus signals to connect to the fixt ure and are
located on the front and back of the fixture . The fixt ure is designed
to be used with a probe positioner, such as a Tektronix PPM203B.
Appendix B: Performance Verification
Figure 19: Probe Calibration Fixture
Using the Probe Calibration Fixture
1. Connect the fixture to the test circuit using an SMA cable.
2. Connect the 50 Ω termination included with the fixture to the
unused SMA connector.
3. Insert and secure the probe in a probe positioner.
4. Position the probe over the fixture, using either the positioner
coarse adjustment or otherwise manipulating the positioner arm
in place.
P7350 5 GHz Differential Probe Instruction Manual
33
Appendix B: Performance Verification
5. Using the fine position and/or pressure adjust, maneuver the
probe so that the pins contact the CM or DM test points,
depending on which test you are performing. (See Figure 20.)
Common mode (CM)Differential mode (DM)
Figure 20: Probe Calibration Fixture test points
6. Verify that contact is made on both pins. (You may ne ed to
readjust the fine position and/or pressure adjustment to make
positive contact with the test points.)
7. Proceed with the specific test instructions.
Equipment Setup
Use this procedure to set up the equipment to test the probe.
1. Connect the probe calibration adapter to the oscilloscope.
2. Connect the probe to the probe calibration adapter.
3. Turn on the oscilloscope and enable the channel.
34
4. Allow 30 minutes for the equipment to warm up.
P7350 5 GHz Differential Probe Instruction Manual
Output Offset Voltage
1. Connect the equipment as shown in Figure 21.
Appendix B: Performance Verification
Digital
multimeter
BNC-to-Dual
Banana adapter
Figure 21: Setup for the output offset voltage test
TDS7404 Oscilloscope
BNC Cable
50 Ω Precision
termination
BNC-SMA adapter
KlipChip
adapters
Calibration
adapter
Set offset switch
to GND
Y-lead
adapter
P7350 Probe
Square
pin
adapter
2. Set the offset switch on the calibration adapter to GND.
NOTE. Leave the offset switch in the ground position for all of the
performance verification checks.
3. Set the multimeter to read DC volts.
4. Verify that the output voltage is 0 V,
5. Record the results on the test record.
P7350 5 GHz Differential Probe Instruction Manual
±10 mV.
35
Appendix B: Performance Verification
DC Gain Accuracy
1. Connect the probe input to the power supplies as shown in
Figure 22. Monitor the source voltage with one of the DMMs.
2. Set the voltage on each power supply to approximately +0.25 V
(+0.5 V total). Record this source voltage as V
1.
in
BNC-to-Dual
Banana Adapter
50 Ω Precision
termination
BNC-SMA
adapter
Calibration
adapter
Digital
multimeter
TDS7404 Oscilloscope
BNC cable
Power supply
Digital multimeter
Power supply
P7350
Probe
KlipChip
adapters
Figure 22: DC Gain Accuracy setup
36
P7350 5 GHz Differential Probe Instruction Manual
--+
Black (--)
Square pin adapter
--+
Red (+)
Y-lead adapter
Appendix B: Performance Verification
3. Record the output voltage (on the second DMM) as V
4. Disconnect and reverse the red and black leads from the probe to
5. Record the output voltage (on the second DMM) as V
6. Calculate the gain as follows: (V
7. Verify that the gain is 0.16, ± 2%.
8. Record the calculated gain on the test record.
Rise Time
This procedure verifies that the probe meets rise time specifications.
Two rise times are measured; the test system, and the test system
with the probe included. The probe rise time is calculated using the
two measurements.
1. Connect the test equipment as shown in Figure 23 on page 38.
the power supplies. Record the actual voltage as V
out
1--V
2) ÷ (Vin1--Vin2).
out
1.
out
2.
in
2.
out
CAUTION. Use care when working with SMA connectors: support
equipment to avoid mechanical strain on the connectors, and use a
torque wrench to tighten connections to 7 in-lbs.
P7350 5 GHz Differential Probe Instruction Manual
37
Appendix B: Performance Verification
TDS7404 Oscilloscope
Calibration
adapter
Sampling head
extender cable
80E04
SMA
M-to-M
adapter
CSA8000/TDS8000
Figure 23: Test system rise time setup
TekConnect-toSMA adapter
Generator remote
head
Internal
clock output
Calibration
step generator
Trigger input
SMA Cable
38
2. Set the CSA/TDS8000 oscilloscope trigger to internal clock.
NOTE. The CSA/TDS8000 oscilloscope is used for taking the
measurements in these procedures. All references to oscilloscope
adjustments refer to the CSA/TDS8000. The TDS7404 oscilloscope is
only used to power the probe.
P7350 5 GHz Differential Probe Instruction Manual
Appendix B: Performance Verification
3. Select the channel you have connected to on the 80E04 sampling
head, and then set the oscilloscope vertical scale to 50 mV/div.
NOTE. The output of the step generator rises from a --250 mV level to
ground.
4. Adjust the oscilloscope horizontal and vertical position controls
to display a signal similar to that shown in Figure 23.
5. Set the oscilloscope horizontal scale to 50 ps/div and center the
waveform.
6. Use the oscilloscope measurement capability to display rise time.
Increase the stability of the pulse edge measurement by using
averaging, if available. Rise time is determined from the 10% and
90% amplitude points on the waveform. Record the rise time
as t
s.
The following steps instruct you to assemble the test setup that
includes the probe, as shown in Figure 24. The system and probe rise
time (t
rise time (t
) that you measure in step 17 is used to calculate the probe
s+p
)instep18.
p
7. Set the step generator control switch to standby.
8. Remove the TekConnect-SMA adapter from the test setup.
9. Connect the probe to the TekConnect calibration adapter.
10. Connect the probe cal fixture to the step generator remote head,
and the termination to the other input of the probe cal fixture.
11. Secure the probe head in the probe positioner.
The test setup should now be connected as shown in Figure 24 on
page 40.
P7350 5 GHz Differential Probe Instruction Manual
39
Appendix B: Performance Verification
TDS7404 Oscilloscope
TekConnect
calibration
adapter
P7350 Probe
Internal
clock output
Sampling head
extender cable
80E04
SMA
M-to-M
adapter
CSA8000/TDS8000
Figure 24: Test system rise time setup with probe
Generator
remote head
SMA cable
Probe cal fixture
067-0419-00
Calibration
step generator
Trigger
input
40
12. Set the step generator control switch to on.
13. On the TDS8000, expand the horizontal scale to help locate the
step edge in step 14, then adjust horizontal range to 500 ps/div
while maintaining the edge view. For a more stable measurement
display, turn averaging on.
14. Using the probe positioner, probe the DM test points on the probe
calibration fixture. Compare your display to Figure 25 on page 41
to verify that you have a valid connection with both pins.
P7350 5 GHz Differential Probe Instruction Manual
Appendix B: Performance Verification
500 ps/div
20% Gain
difference
Both pins in contact
(--) pin not making contact
Figure 25: Verifying both probe pins are contacting the DM test points
15. Adjust the oscilloscope vertical scale to 10 mV/div, averaging on.
16. Adjust the oscilloscope horizontal positioning to place the rising
edge of the signal so that it crosses the second vertical and center
horizontal graticule lines.
17. Use the oscilloscope measurement capability to display rise time.
Rise time is determined from the 10% and 90% amplitude points
on the waveform. Record the rise time as t
s+p.
18. Calculate the probe rise time using the following formula:
t
p
Ꭹ
=t
2
(s+p)
− t
2
s
19. Record the calculated probe rise time on the test record.
P7350 5 GHz Differential Probe Instruction Manual
41
Appendix B: Performance Verification
Test record
Probe Model:
Serial Number:
Certificate Number:
Temperature:
RH %:
Date of Calibration:
Technician:
Performance testMinimumIncomingOutgoingMaximum
Output offset voltage
DC gain accuracy0.1568________________0.1632
Rise timeN/A________________100 ps
-- 1 0 m V________________+10mV
42
P7350 5 GHz Differential Probe Instruction Manual
Appendix C: Maintenance
This section details the maintenance for the P7350 differential probe.
Inspection and Cleaning
Protect the probe from adverse weather conditions. The probe is not
waterproof.
CAUTION. To prevent damage to the probe, do not expose it to sprays,
liquids, or solvents. Do not use chemical cleaning agents; they may
damage the probe. Avoid using chemicals that contain benzine,
benzene, toluene, xylene, acetone, or similar solvents.
Clean the exterior surfaces of the probe with a dry, lint-free cloth or a
soft-bristle brush. If dirt remains, use a soft cloth or swab dampened
with a 75% isopropyl alcohol solution. A swab is useful for cleaning
narrow spaces on the probe. Do not use abrasive compounds on any
part of the probe.
CAUTION. Avoid getting moisture inside the probe during exterior
cleaning and use only enough solution to dampen the swab or cloth.
Use a 75% isopropyl alcohol solution as a cleanser, and rinse with
deionized water.
Replacement Parts
Refer to the Replaceable Parts section for a list of customer
replacement parts. Due to the sophisticated design of the P7350
differential probe, there are no user replaceable parts within the
probe.
P7350 5 GHz Differential Probe Instruction Manual
43
Appendix C: Maintenance
Preparation for Shipment
If the original packaging is unfit for use or not avai lable, use t he
following packaging guidelines:
1. Use a corrugated cardboard shipping carton having inside
dimensions at least one inch greater than the probe dimensions.
The box should have a carton test strength of at least 200 pounds.
2. Put the probe into an antistatic bag or wrap to protect it from
dampness.
3. Place the probe into the box and stabilize it with light packing
material.
4. Seal the carton with shipping tape.
44
P7350 5 GHz Differential Probe Instruction Manual
Appendix D: Replaceable Parts
This section contains a list of replaceable parts for the P7350
differential probe. Use this list to identify and order replacement
parts.
Parts Ordering Information
Replacement parts are available from or through your local
Tektronix, Inc. service center or representative.
Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available and to give you
the benefit of the latest circuit improvements. Therefore, when
ordering parts, it is important to include the following information in
your order:
HPart number
HInstrument type or model number
HInstrument serial number
HInstrument modification number, if applicable
If a part you order has been replac ed with a different or improved
part, your local Tektronix service center or representative will
contact you concerning any change in the part number.
P7350 5 GHz Differential Probe Instruction Manual
45
Appendix D: Replaceable Parts
Using the Replaceable Parts List
The tabular information in the Repl aceable Parts List is arranged for
quick retrieval. Understanding the structure and features of the list
will help you find the information you need for ordering replacement
parts.
Item Names
In the Replaceable Parts List, an Item Name is separated from the
description by a colon (:). Because of space limitations, an Item
Name may sometimes appear as incomplete. For further Item Name
identification, U.S. Federal Cataloging Handbook H6-1 can be used
where possible.
Indentation System
This parts list is indented to show the relationship between items.
The following example is of the indentation system used in the
Description column:
12345Name&Description
Assembly and/or Component
Attaching parts for Assembly and/or Component
(END ATTACHING PARTS)
Detail Part of Assembly and/or Component
Attaching parts for Detail Part
(END ATTACHING PARTS)
Parts of Detail Part
Attaching parts for Parts of Detail Part
(END ATTACHING PARTS)
Attaching parts always appear at the same indentation as the item it
mounts, while the detail parts are indented to the right. Indented
items are part of, and included with, the next higher indentation.
Attaching parts must be purchased separately, unless otherwise
specified.
Abbreviations
46
Abbreviations conform to American National Standards Institute
(ANSI) standard Y1.1