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Tucker-Davis Technologies TDT PA5, Hardware Reference Manual

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PA5 Technical Speci

fi

cations

PA5 Frequency Response

Input Signal Range

±10 V peak

Frequency Range

DC - 200 kHz

Attenuation Range

0.0 to 120.0 dB

Attenuation Resolution

0.1 dB

Attenuation Accuracy

0.05 dB

Spectral Variation

< 0.04 dB (20Hz to 80 kHz)

Offset

< 10 mV

Signal/Noise

113 dB (20 Hz to 80 kHz at 9.9 V)

Noise Floor

16 uV rms (20 Hz to 80 kHz)

THD

< 0.003% (1kHz tone ± 7V peak, 0 dB attenuation)

Attenuation Settling Time

5 ms

Switching Transient

< 8 mV (0 Hz to 80 kHz)

Input Impedance

10 kOhm

Output Impedance

10 Ohm

PA5 Programmable Attenuator | 16

Summary of Contents for TDT PA5

Page 1: ...PA5 Programmable Attenuator Hardware Reference Updated 2021 04 19 ...

Page 2: ...ices The information contained in this document is provided as is and is subject to being changed without notice TDT shall not be liable for errors or damages in connection with the furnishing use or performance of this document or of any information contained herein The latest versions of TDT documents are always online at https www tdt com docs PA5 Programmable Attenuator 2 ...

Page 3: ...ten Mode Parameters 9 PA5 Manual Operation Menus 10 PA5 Top Level Menu 12 Setting Base Attenuation 13 Setting a Reference Value 13 Using Preset Configurations 14 Saving Preset Configurations 14 Loading Preset Configurations 15 PA5 Display Icons 15 Menu Level Icons 15 Attenuation Mode Icons 16 PA5 Technical Specifications 16 PA5 Frequency Response 17 PA5 Frequency Response with 50 dB Attenuation 17...

Page 4: ...iveX Controls in any programming environment that supports ActiveX controls such as Matlab Python or LabVIEW For information about how to control the module programmatically see the ActiveX Reference Manual When used in manual operation the attenuation level is adjusted in two modes of operation In Atten mode the attenuation level of the signal can be adjusted from 0 to 120 dB in increments of 0 1...

Page 5: ...lay Icons for more information ESC Button Exits the manual operations menu items without accepting changes SELECT ENTER Knob During manual operation allows the user to adjust the attenuation applied to the signal In addition it allows the user to scroll through the manual operation menus set up user defined attenuation parameters and access descriptions of menu item Turn the Select knob to adjust ...

Page 6: ...evels of menus Top level menu items are indicated by a single filled box in the upper left corner of the menu display and sub menus are indicated with an additional indicator box for each level Only the UserOps menu item has sub menu items See PA5 Display Icons for more information For a definition of each menu item Turn the Select knob until the name of the menu appears on the display then press ...

Page 7: ...meter configurations in the PA5 s nonvolatile memory See Using Preset Configurations for more information To use UserAtt mode Turn the Select knob until UserAtt appears on the display then press and release the Select knob A small letter U appears in the upper left corner of the display indicating the unit is in UserAtten mode and a decibel reading appears on the right side of the display See PA5 ...

Page 8: ...n BaseAtt and reference value Refrnce parameters Both base attenuation and reference can be used simultaneously producing an actual attenuation equal to Refrnce BaseAtt dial setting See PA5 Manual Operation for more information BaseAtt Base Attenuation Adds a fixed attenuation value shifting the scale down and allowing attenuation to be displayed relative to this base level useful for calibrating ...

Page 9: ... display then press and release the knob The module has two levels of menus Top level menu items are indicated by a single filled box in the upper left corner of the menu display and sub menus are indicated with an additional indicator box for each level Only the UserOps menu item has sub menu items For a definition of each menu item Turn the Select knob until the name of the menu appears on the d...

Page 10: ...s 0 0 dB and the range is 0 to 100 0 dB When BaseAtt is set a symbol appears on the left side of the display When used the attenuation level displayed is relative to BaseAtt For example with BaseAtt set to 60 0 dB the attenuation level will be display from 60 0 dB to 60 0 dB StpSize Sets the increments of attenuation The default setting is 3 0 dB and the range is 0 1 to 60 0 dB Refrnce Changes the...

Page 11: ... for the subject or equipment The default value is 0 0 dB and its range is 0 0 to 100 0 dB Note that setting this parameter limits the range of possible attenuation levels For example when it is set to 30 0 dB the range of attenuation is 30 db to 120 dB Access UserOps submenu Load PS Loads one of four preset UserAtt configurations from non volatile memory See Save PS Below The default is 1 and its...

Page 12: ...eature can be used to calibrate a number of different experimental setups attenuating each by a different base attenuation so as to provide identical signal levels when each is set to 0 0 dB UserAtt When this feature is in use a symbol is displayed on the left side of the display Note that the Base Attenuation and Reference parameters can be used simultaneously When both of these features are in u...

Page 13: ...Icons for more information To set the Reference parameter Access the UserOps menu and turn the Select knob until Refrnce appears on the display Press and release the Select knob 0 0 dB appears on the display Turn the Select knob until the display shows the desired level Press and release the Select knob The reference is saved To exit the UserOps menu press and release the ESC button Using Preset C...

Page 14: ... The configuration is saved Loading Preset Configurations When a configuration has been set up via the UserOps menu and saved via the SavePS menu load the configuration by performing the following Turn the Select knob until LoadPS appears on the display Press and release the Select knob Preset 1 appears on the display Turn the Select knob until the desired preset location is displayed and then pre...

Page 15: ...menu Double Box indicates a second level menu Display Description A Normal Attenuation Mode U User Attenuation Mode U User Attenuation Mode Base attenuation value set R User Attenuation Mode Reference level set R User Attenuation Mode Base attenuation value and reference level set PA5 Programmable Attenuator 15 ...

Page 16: ... 1 dB Attenuation Accuracy 0 05 dB Spectral Variation 0 04 dB 20Hz to 80 kHz Offset 10 mV Signal Noise 113 dB 20 Hz to 80 kHz at 9 9 V Noise Floor 16 uV rms 20 Hz to 80 kHz THD 0 003 1kHz tone 7V peak 0 dB attenuation Attenuation Settling Time 5 ms Switching Transient 8 mV 0 Hz to 80 kHz Input Impedance 10 kOhm Output Impedance 10 Ohm PA5 Programmable Attenuator 16 ...

Page 17: ...PA5 Frequency Response with 50 dB Attenuation PA5 Total Harmonic Distortion PA5 Programmable Attenuator 17 ...

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