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PZ Amplifiers

PZ Block Diagrams, showing a single amp (left) and sub amps (right).

The PZ amplifier HAL reads data from a connected PZn amplifier. The options vary for each amplifier model. The PZ5 amplifier can have up to four logical sub amps; each sub amp is individually configurable and forms a multi-channel floating point data sources that can be linked to other gizmos. All other PZs have one multi-channel floating point data source.

PZ5 Options

PZ5 Analog and Digital Options.


Option Description
Use Sub Amps check box Select to divide input channels into logical sub amps that can be used to record different types of signals, at different rates, referencing modes, and other settings.
Sub Amps radio buttons Select a radio button to view and edit settings for the corresponding sub amp: Sub1, Sub2, Sub3, or Sub4.
When sub amps are used, all of the below configuration options apply only to the selected sub amp. Each sub amp that will be used must be configured separately.
If a conflict or error is detected as a result of any changed settings, Synapse displays the relevant sub amp settings and a red warning.
Enable Select to enable the selected sub amp.
Type Use an Analog or Digital amp board. When using Digital Amps, specify the number of boards. Selectable values are limited by the Rig configuration.
Channels Type or click arrow keys to set the number of channels. The channel count must be at least four and must be a multiple of 2. The corresponding physical bank of channels on the PZ5 is displayed to the right. Note: In Differential Reference Mode, the channels from the PZ5 sub-amp are mapped for you to remove duplicates.
Name ID Choose the name for this sub amp data source that will be visible to other gizmos.
Option Description
PZ5M Secondary Port
(Don't Configure Amp)
When using a PZ5M with either 256 or 512 channels, two PZ5 HALs may be specified in the Rig Editor, one for each fiber optic connection from the PZ5M. Only the fiber connected to the Primary port can configure the PZ5M. Use this check box on the PZ5 HAL connected to the Secondary port on the PZ5M. This setting disables the HAL configuration options and only reads the channel data from the port.
Fast Access For a PZn connected to a DSPP card, select to perform 16-bit data reads to reduce cycle usage on the DSP.
LED Activity Tell the PZ5 whether to flash the green activity LEDs on its front panel when activity is detected
LED Clipping Tell the PZ5 whether to flash the red clipping LEDs when the signal is close to saturating the amplifier
Option Description
Sampling Rate Set the Sampling Rate to match the desired frequency band of your incoming signals (or leave at 'System Rate' if you are unsure). By default, the sampling rate matches that of the RZ.
External Ground Connect this sub-amp ground to the external ground plug on the physical PZ5 device.
Caution: When using multiple sub-amps make sure they aren't all sharing the External Ground connection or else they won't be isolated!
DC Coupled Remove the 0.4Hz high pass filter on the input signals and record DC potentials.
Reference Mode Select the mode from the drop-down menu.
Local - each bank of 16 uses its own reference (pin 5 on the DB26).
Shared - all channels in sub-amp share the same reference (pin 5 of first bank in sub-amp).
None - the ground connection is used as the reference.
Differential - each even channel acts as a reference for the odd channel before it. Note: the output channels will be mapped for you to remove duplicate channels.
Filtering Set the anti-aliasing low pass filter cutoff as a percentage of the sampling rate.
Impedance Target This only affects the displayed impedance text colors on the touchscreen when running an impedance check. Must be using a passive headstage to run impedance check.
Set to base type If you are unsure, use Set to Base Type to configure the amp with default settings based on common signal types.
Option Description
Use Sub Amps check box Select to divide input channels into logical sub amps that can be used to record different types of signals, at different rates, referencing modes, and other settings.
Sub Amps radio buttons Select a radio button to view and edit settings for the corresponding sub amp: Sub1, Sub2, Sub3, or Sub4.
When sub amps are used, all of the below configuration options apply only to the selected sub amp. Each sub amp that will be used must be configured separately.
If a conflict or error is detected as a result of any changed settings, Synapse displays the relevant sub amp settings and a red warning.
Enable Select to enable the selected sub amp.
Type Use an Analog or Digital amp board. When using Digital Amps, specify the number of boards. Selectable values are limited by the Rig configuration.
Channels Type or click arrow keys to set the number of channels. The channel count must be at least four and must be a multiple of 2. The corresponding physical bank of channels on the PZ5 is displayed to the right. Note: In Differential Reference Mode, the channels from the PZ5 sub-amp are mapped for you to remove duplicates.
Name ID Choose the name for this sub amp data source that will be visible to other gizmos.
Option Description
PZ5M Secondary Port
(Don't Configure Amp)
When using a PZ5M with either 256 or 512 channels, two PZ5 HALs may be specified in the Rig Editor, one for each fiber optic connection from the PZ5M. Only the fiber connected to the Primary port can configure the PZ5M. Use this check box on the PZ5 HAL connected to the Secondary port on the PZ5M. This setting disables the HAL configuration options and only reads the channel data from the port.
Fast Access For a PZn connected to a DSPP card, select to perform 16-bit data reads to reduce cycle usage on the DSP.
LED Activity Tell the PZ5 whether to flash the green activity LEDs on its front panel when activity is detected
LED Clipping Tell the PZ5 whether to flash the red clipping LEDs when the signal is close to saturating the amplifier
Option Description
Sampling Rate Set the Sampling Rate to match the desired frequency band of your incoming signals (or leave at 'System Rate' if you are unsure). By default, the sampling rate matches that of the RZ.
External Ground Connect this sub-amp ground to the external ground plug on the physical PZ5 device. Caution: When using multiple sub-amps make sure they aren't all sharing the External Ground connection or else they won't be isolated!
AC Coupled Apply a 0.4Hz high pass filter to the incoming signals.
Low Pass Filter Select a cutoff frequency for a lowpass filter that is implemented on the digital headstage. Set to 'Auto' to match it to the sub-amp sampling rate. See table below
Use DSP Filter check box Add an additional lowpass digital filter implemented on the RZ, set to the same frequency as the Low Pass Filter setting above, to remove high frequency digital noise from the incoming signal that was added by the digitizing chip.
High Pass Filter Select a cutoff frequency for a highpass filter that is implemented on the digital headstage.
Impedance Target Use this to inform the optimal configuration of the impedance checking circuit on the headstage.

'Auto' low pass filter settings for different sub amp sampling rates

Sampling Rate LP Auto Filter
750 Hz 300 Hz
1.5 kHz 750 Hz
3 kHz 1.5 kHz
6 kHz 3 kHz
12 kHz 5 kHz
25 kHz 10 kHz

Technical Detail


See the PZ5 section of the System 3 Manual for more information about configuring and using the PZ5 amplifier.

PZ2 / PZ3/ PZ4 Options

Option Description
Channels Type or click arrow keys to set the number of channels.
Fast Access For a PZ2 connected to a DSPP card, select to perform 16-bit data reads to reduce cycle usage on the DSP.
Name ID Choose the name for this data source that will be visible to other gizmos.

Option Description
Channels Type or click arrow keys to set the number of channels.
Fast Access For a PZ3 connected to a DSPP card, select to perform 16-bit data reads to reduce cycle usage on the DSP.
Name ID Choose the name for this data source that will be visible to other gizmos.
Reference Mode Select the mode from the drop-down menu.
Shared - all channels use a separate shared reference.
Differential - each even channel acts as a reference for the odd channel before it.
Input Range Select the desired maximum input range.
Map (Recommended) Select to remove the even channels and use only the signal channels in the data source output.

Technical Detail


See the PZ3 section of the System 3 Manual for more information about the operational modes of the PZ3 amplifier.

Option Description
Channels Type or click arrow keys to set the number of channels.
Fast Access For a PZ4 connected to a DSPP card, select to perform 16-bit data reads to reduce cycle usage on the DSP.
Name ID Choose the name for this data source that will be visible to other gizmos.