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ZD96 Tech Notes

Digital headstage channels are out of order

TN2002

Product: ZD64, ZD96
Version: All
Date Added: 2020-07-31

Issue

The pinout on the ZD64 and ZD96 headstages are not linear. See https://www.tdt.com/files/manuals/Sys3Manual/ZDDigital.pdf#page=7. Channels recorded with these headstages are not in the expected order.

Solution

Use a Mapper Gizmo to remap the channels coming from the PZ5 or PZA amplifier. The Mapper gizmo has a default map for the ZD64 and ZD96 headstage in the dropdown lists.

Spontaneous oscillations in ZD digital headstages

TN0985

Product: ZD32, ZD64, ZD96, ZD128
Version: All
Date Added: 2017-09-22

Issue

There is a known issue with the Intan RHD2132 and RHD2164 chips used in the ZD32 and ZD64 headstages. When attaching an array to the headstage, some channels will sometimes stop returning valid data and instead only return a ±100uV high frequency noise. The problem occurs on all headstages, but some exhibit the behavior more often than others. The two plots below are examples showing the plot decimated signal bandpass filtered at 300-5000Hz (pNe1), raw signal (Wav1), LFP (LFP1), and Power Spectrum of the data in this state.

Workaround

This Intan chip issue is triggered by rapid changes in the impedance that the amplifier sees. Always power cycle the PZ5 after attaching the headstage to an array before starting your experiment.